JP3688207B2 - Organic EL device and organic EL display - Google Patents

Organic EL device and organic EL display Download PDF

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Publication number
JP3688207B2
JP3688207B2 JP2001042102A JP2001042102A JP3688207B2 JP 3688207 B2 JP3688207 B2 JP 3688207B2 JP 2001042102 A JP2001042102 A JP 2001042102A JP 2001042102 A JP2001042102 A JP 2001042102A JP 3688207 B2 JP3688207 B2 JP 3688207B2
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organic
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JP2001307885A (en
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俊彦 元松
嘉一 坂口
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Samsung SDI Co Ltd
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Samsung SDI Co Ltd
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Description

【0001】
【発明の属する技術分野】
本発明は有機EL素子(有機エレクトロルミネッセンス素子)に関し、さらに詳述すると、発光効率に優れ、輝度、色度の良好な赤色有機EL素子及びそれを用いた有機ELディスプレイに関する。
【0002】
【従来の技術】
従来、有機EL素子、特に赤色有機EL素子においては、実用レベルの輝度を得るために、一般的に使用されている蛍光量子収率の高い下記一般式[a]
(Q)3−Al … [a]
[一般式[a]中のQは、置換若しくは未置換の8−キノリノラート配位子を表す。]の発光性有機アルミニウム錯体や、下記一般式[b]
【化16】

Figure 0003688207
[一般式[b]中のA1〜A4は、それぞれ独立に炭素数6〜18のアリール基を表す。R1〜R8は、それぞれ独立に水素原子、ハロゲン原子、アルキル基、アルコキシ基、アリール基又はアミノ基を表す。]の芳香族アミン誘導体をホストとし、これに赤色材料をドーピングしたものを発光層としていた。
【0003】
例えば、C.W.Tang:"An Overview of Organic Electroluminescent Materialsand Devices",SID 96DIGEST.,14.1,pp.181-184(1996)に記載の有機EL素子では、発光性有機アルミニウム錯体である下記化合物4
【化17】
Figure 0003688207
のトリス(8−キノリノラート)アルミニウムをホストとし、これに赤色発光材料のDCJTをドープすることにより発光層としている。また、特開平10−72581では、前記一般式[b]に示した芳香族アミン誘導体をホストとし、これに赤色発光材料をドープすることにより発光層としている。
【0004】
ところで、実用的観点から、現状の有機EL素子は長寿命化、熱的安定性が必須であり、そのために陽極とホール輸送層との間に、高耐熱化用ホール注入層を使用していた。しかし、これにより寿命特性が向上する反面、発光層へのホール注入特性が悪化していた。その結果、発光層での再結合収率が低下し、十分な発光効率が得られなかった。さらに、印加電圧の関係で電子が発光層から漏れるという問題、つまりキャリアバランスが変化し、ホール輸送層そのものが発光することにより色合いが変化するという問題があった。
【0005】
ここで、従来の有機EL素子について図面を参照しながら説明する。図5は有機EL素子の断面図である。図5において従来の有機EL素子は、ガラス基板1上にITO(インジウム−スズ酸化物)からなる陽極(透明電極)2を形成し、この上にホール注入層3、ホール輸送層4、発光層5、電子輸送層6などの有機EL層及び陰極7等を形成することにより構成されている。ここで発光層5には、蛍光量子収率の高い発光性有機アルミニウム錯体(一般式[a])をホストとし、これに赤色材料がドープされている。また、このとき電子輸送層6として電子輸送性のある発光性有機アルミニウム錯体(一般式[a])を用いることもある。
【0006】
【発明が解決しようとする課題】
従来、高耐熱化用ホール注入層を使用していることから、寿命特性が向上する反面、発光層へのホール注入特性が悪化していた。このことは発光層におけるホール−電子の再結合収率の低下を招き、十分な発光効率が得られないという問題を引き起こしていた。さらには、電圧増加に伴って電子が発光層から漏れ出し、ホール輸送層そのものが発光することにより色合いが変化するという問題もあった。よって、従来の素子構成では、発光効率に優れ、高輝度でかつ常時色度の安定した有機ELデバイスを提供することができなかった。これは、発光層へのホール注入特性が低く、また電圧が増加すると電子輸送性が変化し、本来発光層で起きるべきホール−電子の再結合が、ホール輸送層中で起きてしまうからであった。
【0007】
本発明は、前述した事情に鑑みてなされたもので、発光効率に優れ、輝度、色度の良好な赤色有機EL素子を提供することを目的とする。
【0008】
【課題を解決するための手段】
本発明は、前記目的を達成するため、下記(1)〜(15)に示す有機EL素子及び有機ELディスプレイを提供する。
【0009】
(1)互いに対向する陽極と陰極間に、少なくとも単層又は複数層の有機薄膜よりなる発光層と、電子注入層又は電子輸送層を備えた有機EL素子において、下記一般式[1]
【化1】
Figure 0003688207
[一般式[1]中のR1〜R28は、それぞれ独立に水素原子、ハロゲン原子、置換若しくは未置換のアルキル基、置換若しくは未置換のアルコキシ基、置換若しくは未置換のアリール基、又は、置換若しくは未置換のアミノ基を表す。Y1〜Y4は、それぞれ独立にO、S、SO2、C=O、CH2O、CH2OCH2、又は、置換若しくは未置換のアルキレン基を表す。R1〜R4、R5〜R8は、互いに結合して飽和若しくは不飽和の5員環又は6員環を形成してもよい。]で示される芳香族アミン誘導体と、下記一般式[2]
【化2】
Figure 0003688207
[一般式[2]中のX1〜X20は、それぞれ独立に水素原子、ハロゲン原子、置換若しくは未置換のアルキル基、置換若しくは未置換のアルコキシ基、置換若しくは未置換のアリール基、又は、置換若しくは未置換のアミノ基を表す。X1〜X20は、互いに結合して飽和若しくは不飽和の5員環又は6員環を形成してもよい。]で示されるジベンゾ{[f,f']−4,4',7,7'−テトラフェニル}ジインデノ[1,2,3−cd:1',2',3'−lm]ペリレン誘導体とを混合させた少なくとも1層の発光層を有し
前記電子注入層又は電子輸送層が、下記一般式[3]
【化11】
Figure 0003688207
[一般式[3]中のMは金属原子を表す。R 1 〜R 3 、R 5 及びR 6 は、それぞれ独立に水素原子、ハロゲン原子、置換若しくは未置換のアルキル基、置換若しくは未置換のアルコキシ基、置換若しくは未置換のアリール基、置換若しくは未置換のアリールオキシ基、置換若しくは未置換のシクロアルキル基又はシアノ基を表す。Lは、ハロゲン原子、置換若しくは未置換のアルコキシ基、置換若しくは未置換のアリールオキシ基、置換若しくは未置換のアルキル基、置換若しくは未置換のアリールオキシ基又は置換若しくは未置換のシクロアルキル基を有する配位子を表し、R 4 はアリール基を表す。]で示される有機金属錯体を含むことを特徴とする有機EL素子。
【0010】
(2)互いに対向する陽極と陰極間に、少なくとも単層又は複数層の有機薄膜よりなる発光層と、電子注入層又は電子輸送層を備えた有機EL素子において、下記一般式[1]
【化1】
Figure 0003688207
[一般式[1]中のR 1 〜R 28 は、それぞれ独立に水素原子、ハロゲン原子、置換若しくは未置換のアルキル基、置換若しくは未置換のアルコキシ基、置換若しくは未置換のアリール基、又は、置換若しくは未置換のアミノ基を表す。Y 1 〜Y 4 は、それぞれ独立にO、S、SO 2 、C=O、CH 2 O、CH 2 OCH 2 、又は、置換若しくは未置換のアルキレン基を表す。R 1 〜R 4 、R 5 〜R 8 は、互いに結合して飽和若しくは不飽和の5員環又は6員環を形成してもよい。]で示される芳香族アミン誘導体と、下記一般式[2]
【化2】
Figure 0003688207
[一般式[2]中のX 1 〜X 20 は、それぞれ独立に水素原子、ハロゲン原子、置換若しくは未置換のアルキル基、置換若しくは未置換のアルコキシ基、置換若しくは未置換のアリール基、又は、置換若しくは未置換のアミノ基を表す。X 1 〜X 20 は、互いに結合して飽和若しくは不飽和の5員環又は6員環を形成してもよい。]で示されるジベンゾ{[f,f ' ]−4,4 ' ,7,7 ' −テトラフェニル}ジインデノ[1,2,3−cd:1 ' ,2 ' ,3 ' −lm]ペリレン誘導体とを混合させた少なくとも1層の発光層を有し、
前記電子注入層又は電子輸送層が、下記一般式[3]
【化11】
Figure 0003688207
[一般式[3]中のMは金属原子を表す。R 1 〜R 6 は、それぞれ独立に水素原子、ハロゲン原子、置換若しくは未置換のアルキル基、置換若しくは未置換のアルコキシ基、置換若しくは未置換のアリール基、置換若しくは未置換のアリールオキシ基、置換若しくは未置換のシクロアルキル基又はシアノ基を表す。Lは、ハロゲン原子、置換若しくは未置換のアルコキシ基、置換若しくは未置換のアリールオキシ基、置換若しくは未置換のアルキル基、置換若しくは未置換のアリールオキシ基又は置換若しくは未置換のシクロアルキル基を有する配位子を表す。]で示される有機金属錯体を複数種含むことを特徴とする有機EL素子。
【0011】
(3)前記一般式[1]で示される芳香族アミン誘導体が、下記一般式[4]
【化3】
Figure 0003688207
[一般式[4]中のR 1 〜R 28 は、それぞれ独立に水素原子、ハロゲン原子、置換若しくは未置換のアルキル基、置換若しくは未置換のアルコキシ基、置換若しくは未置換のアリール基、又は、置換若しくは未置換のアミノ基を表す。Y 1 〜Y 4 は、それぞれ独立にO、S、SO 2 、C=O、CH 2 O、CH 2 OCH 2 、又は、置換若しくは未置換のアルキレン基を表す。R 1 〜R 4 、R 5 〜R 8 は、互いに結合して飽和若しくは不飽和の5員環又は6員環を形成してもよい。]で示される芳香族アミン誘導体であることを特徴とする(1)、(2)の有機EL素子。
【0012】
(4)前記一般式[1]で示される芳香族アミン誘導体が、下記一般式[5]
【化5】
Figure 0003688207
[一般式[5]中のR 1 〜R 28 は、それぞれ独立に水素原子、ハロゲン原子、置換若しくは未置換のアルキル基、置換若しくは未置換のアルコキシ基、置換若しくは未置換のアリール基、又は、置換若しくは未置換のアミノ基を表す。X 1 〜X 8 は、置換若しくは未置換の炭素数1〜20のアルキル基、又は、置換若しくは未置換の炭素数6〜16のアリール基を表す。R 1 〜R 4 、R 5 〜R 8 は、互いに結合して飽和若しくは不飽和の5員環又は6員環を形成してもよい。]で示される芳香族アミン誘導体であることを特徴とする(1)、(2)の有機EL素子。
【0013】
(5)互いに対向する陽極と陰極間に、少なくとも単層又は複数層の有機薄膜よりなる発光層と、電子注入層又は電子輸送層を備えた有機EL素子において、下記一般式[6]
【化7】
Figure 0003688207
[一般式[6]中のR 1 〜R 28 は、それぞれ独立に水素原子、ハロゲン原子、置換若しくは未置換のアルキル基、置換若しくは未置換のアルコキシ基、置換若しくは未置換のアリール基、又は、置換若しくは未置換のアミノ基を表す。R 1 〜R 4 、R 5 〜R 8 は、互いに結合して飽和若しくは不飽和の5員環又は6員環を形成してもよい。]で示される芳香族アミン誘導体と、下記一般式[2]
【化8】
Figure 0003688207
[一般式[2]中のX 1 〜X 20 は、それぞれ独立に水素原子、ハロゲン原子、置換若しくは未置換のアルキル基、置換若しくは未置換のアルコキシ基、置換若しくは未置換のアリール基、又は、置換若しくは未置換のアミノ基を表す。X 1 〜X 20 は、互いに結合して飽和若しくは不飽和の5員環又は6員環を形成してもよい。]で示されるジベンゾ{[f,f ' ]−4,4 ' ,7,7 ' −テトラフェニル}ジインデノ[1,2,3−cd:1 ' ,2 ' ,3 ' −lm]ペリレン誘導体とを混合させた少なくとも1層の発光層を有し、
前記電子注入層又は電子輸送層が、下記一般式[3]
【化11】
Figure 0003688207
[一般式[3]中のMは金属原子を表す。R 1 〜R 3 、R 5 及びR 6 は、それぞれ独立に水素原子、ハロゲン原子、置換若しくは未置換のアルキル基、置換若しくは未置換のアルコキシ基、置換若しくは未置換のアリール基、置換若しくは未置換のアリールオキシ基、置換若しくは未置換のシクロアルキル基又はシアノ基を表す。Lは、ハロゲン原子、置換若しくは未置換のアルコキシ基、置換若しくは未置換のアリールオキシ基、置換若しくは未置換のアルキル基、置換若しくは未置換のアリールオキシ基又は置換若しくは未置換のシクロアルキル基を有する配位子を表し、R 4 はアリール基を表す。]で示される有機金属錯体を含むことを特徴とする有機EL素子。
【0014】
(6)互いに対向する陽極と陰極間に、少なくとも単層又は複数層の有機薄膜よりなる発光層と、電子注入層又は電子輸送層を備えた有機EL素子において、下記一般式[6]
【化7】
Figure 0003688207
[一般式[6]中のR 1 〜R 28 は、それぞれ独立に水素原子、ハロゲン原子、置換若しくは未置換のアルキル基、置換若しくは未置換のアルコキシ基、置換若しくは未置換のアリール基、又は、置換若しくは未置換のアミノ基を表す。R 1 〜R 4 、R 5 〜R 8 は、互いに結合して飽和若しくは不飽和の5員環又は6員環を形成してもよい。]で示される芳香族アミン誘導体と、下記一般式[2]
【化8】
Figure 0003688207
[一般式[2]中のX 1 〜X 20 は、それぞれ独立に水素原子、ハロゲン原子、置換若しくは未置換のアルキル基、置換若しくは未置換のアルコキシ基、置換若しくは未置換のアリール基、又は、置換若しくは未置換のアミノ基を表す。X 1 〜X 20 は、互いに結合して飽和若しくは不飽和の5員環又は6員環を形成してもよい。]で示されるジベンゾ{[f,f ' ]−4,4 ' ,7,7 ' −テトラフェニル}ジインデノ[1,2,3−cd:1 ' ,2 ' ,3 ' −lm]ペリレン誘導体とを混合させた少なくとも1層の発光層を有し、
前記電子注入層又は電子輸送層が、下記一般式[3]
【化11】
Figure 0003688207
[一般式[3]中のMは金属原子を表す。R 1 〜R 6 は、それぞれ独立に水素原子、ハロゲン原子、置換若しくは未置換のアルキル基、置換若しくは未置換のアルコキシ基、置換若しくは未置換のアリール基、置換若しくは未置換のアリールオキシ基、置換若しくは未置換のシクロアルキル基又はシアノ基を表す。Lは、ハロゲン原子、置換若しくは未置換のアルコキシ基、置換若しくは未置換のアリールオキシ基、置換若しくは未置換のアルキル基、置換若しくは未置換のアリールオキシ基又は置換若しくは未置換のシクロアルキル基を有する配位子を表す。]で示される有機金属錯体を複数種含むことを特徴とする有機EL素子。
【0015】
(7)一般式[2]のジベンゾ{[f,f ' ]−4,4 ' ,7,7 ' −テトラフェニル}ジインデノ[1,2,3−cd:1 ' ,2 ' ,3 ' −lm]ペリレン誘導体が下記式[2a]で示される化合物であることを特徴とする(1)、(2)、(5)、及び(6)の有機EL素子。
【化9】
Figure 0003688207
【0016】
(8)一般式[2]のジベンゾ{[f,f ' ]−4,4 ' ,7,7 ' −テトラフェニル}ジインデノ[1,2,3−cd:1 ' ,2 ' ,3 ' −lm]ペリレン誘導体が下記式[2b]で示される化合物であることを特徴とする(1)、(2)、(5)、及び(6)の有機EL素子。
【化10】
Figure 0003688207
【0017】
(9)一般式[1]、[4]、[5]又は[6]の芳香族アミン誘導体をホストとし、これに一般式[2]のジベンゾ{[f,f ' ]−4,4 ' ,7,7 ' −テトラフェニル}ジインデノ[1,2,3−cd:1 ' ,2 ' ,3 ' −lm]ペリレン誘導体がドープされており、ドープ比率が1〜10%であることを特徴とする(1)、(2)、(5)、及び(6)の有機EL素子。
【0018】
(10)一般式[3]の有機金属錯体が下記式[3a]で示される化合物であることを特徴とする(1)、(5)の有機EL素子。
【化12】
Figure 0003688207
【0019】
(11)一般式[3]の有機金属錯体が下記式[3b]で示される化合物であることを特徴とする(1)、(5)の有機EL素子。
【化13】
Figure 0003688207
【0020】
(12)電子注入層又は電子輸送層が、一般式[3]で示される有機金属錯体を複数種含むことを特徴とする(1)、(5)、(10)、及び(11)に記載の有機EL素子。
【0021】
(13)電子注入層又は電子輸送層が、下記式[3a]で示される化合物及び下記式[3b]で示される化合物を含むことを特徴とする(12)の有機EL素子。
【化14】
Figure 0003688207
【化15】
Figure 0003688207
【0022】
(14)電子注入層又は電子輸送層が、下記一般式[a]
(Q)3−Al … [a]
[一般式[a]中のQは、置換若しくは未置換の8−キノリノラート配位子を表す。]で示される発光性有機アルミニウム錯体を含むことを特徴とする請求項(1)、(2)、(5)、(6)、(10)、及び(11)に記載の有機EL素子。
【0023】
(15)前記(1)〜(14)の有機EL素子を搭載したことを特徴とする有機ELディスプレイ。
【0024】
本発明は、発光層において、一般式[1]、[4]、[5]、[6]で示される芳香族アミン誘導体と、一般式[2]で示される赤色発光材料のジベンゾ{[f,f']−4,4',7,7'−テトラフェニル}ジインデノ[1,2,3−cd:1',2',3'−lm]ペリレン誘導体とを混合させることによって、より良好なホール輸送性能(電子ブロック性能)を持たせることや、赤色発光材料の濃度消光などを適度に抑制させることができ、その結果、発光効率に優れ、輝度、色度の良好な赤色有機EL素子を得ることができる。
【0025】
また、緑色発光材料として長寿命特性を有する前記芳香族アミン誘導体と、非結晶材料の前記ジベンゾ{[f,f']−4,4',7,7'−テトラフェニル}ジインデノ[1,2,3−cd:1',2',3'−lm]ペリレン誘導体とを使用していることからも、さらに寿命特性の向上が図れる。
【0026】
さらに、電子注入層あるいは電子輸送層に一般式[3]で示される有機金属錯体を複数種含有させると、輝度を高く保持することができる。すなわち、電子注入層あるいは電子輸送層において上記有機金属錯体を1種類だけ使用した場合は、高温下で長時間使用すると薄膜の凝集や結晶化が進行し、電子注入特性あるいは電子輸送特性が低下する傾向がある。これに対し、上記有機金属錯体を2種類以上含有させると非晶質性(アモルファス性)が高くなるため、長時間使用しても凝集、結晶化が生じにくく、そのため電子注入特性あるいは電子輸送特性の低下を抑制することができる。
【0027】
【発明の実施の形態】
次に、本発明の実施形態について図面を参照して詳細に説明する。図1は本発明の一実施形態を示す有機EL素子の概略断面図である。図1においてこの有機EL素子は、ガラス基板1上にITO(インジウム−スズ酸化物)からなる陽極(透明電極)2を形成し、この上にホール注入層3、ホール輸送層4、発光層5、電子輸送層6などの有機EL層及び陰極7等を形成することにより構成されている。素子には耐熱性を持たせるため、ホール注入層3として高耐熱化用ホール注入層を設けてある。
【0028】
ここで、本発明の素子において発光層5に対し、一般式[1]の芳香族アミン誘導体と、赤色発光材料である一般式[2]のジベンゾ{[f,f']−4,4',7,7'−テトラフェニル}ジインデノ[1,2,3−cd:1',2',3'−lm]ペリレン誘導体とを混合させて使用する。このとき、ジベンゾ{[f,f']−4,4',7,7'−テトラフェニル}ジインデノ[1,2,3−cd:1',2',3'−lm]ペリレン誘導体のドープ量は蒸着レートで制御しており、色素自体の濃度消光を抑制するために、ドープ量は前記芳香族アミン誘導体に対して1〜10%程度にするのが好ましい。
【0029】
ところで、本発明の一般式[1]で示される化合物は公知の方法で合成することができる。例えば、アントラセン誘導体、アントラキノン誘導体等に、置換若しくは未置換のアミン誘導体と、炭酸カリウム、炭酸ナトリウム、水酸化カリウム、水酸化ナトリウム等とを、ベンゼン、トルエン又はキシレン等の溶媒下で反応させることにより合成することができる。触媒として、銅粉、塩化第一銅、スズ、塩化第一スズ、ピリジン等がある。また、本発明の一般式[2]で示される化合物も公知の方法で合成することができる。例えば、ベンゾ[k]フルオランテン誘導体を塩化アルミニウム/塩化ナトリウム、フッ化コバルト、トリフルオロ酢酸タリウム等の存在下で反応させることにより合成することができる。
【0030】
次に、電子輸送層6に対し、一般式[3]で示されるイオン化ポテンシャルの大きい有機金属錯体を使用することにより、電子輸送層におけるホールブロック性能をさらに大きくすることができる。一般式[3]で示される電子輸送材料は、公知の方法で合成することができる。例えば、ガリウム化合物と一般式[3]の括弧内及びLの配位子残基を有する化合物を原料として合成することができる。すなわち、アルキルガリウム、ガリウムアルコキシド、ハロゲン化ガリウム、窒化ガリウム、酸化ガリウム等に、一般式[3]の括弧内の配位子として8−ヒドロキシキノリン、2−メチル−8−ヒドロキシキノリン等のキノリン残基を2配位、Lの配位子としてハロゲン原子、置換若しくは未置換のアルコキシ基、アリールオキシ基、アルキル基を有する残基を1配位、メタノール、エタノールベンゼン、トルエン、テトラヒドロフラン等の溶媒下で反応させる。
【0031】
以下、本発明について実施例を参照して説明するが、本発明の要旨を変更しない限り、本発明は以下の実施例に限定されるものではない。
【0032】
参考例1
本実施例の有機EL素子は、発光層5として下記化合物1
【化28】
Figure 0003688207
の芳香族アミン誘導体に、下記化合物2
【化29】
Figure 0003688207
のジベンゾテトラフェニルペリフランテンを蒸着レート比で2.5%ドープした。電子輸送層6については、下記化合物3
【化30】
Figure 0003688207
のガリウム金属錯体を成膜することにより作製した。その結果、電流効率6cd/A以上(〜1,000cd/m2)、最高輝度38,000cd/m2の実用レベルの赤色発光が得られた。また、この素子は色度安定性も良好で、印加電圧に伴う色合いの変化が小さかった。
【0033】
ここで図2に、本発明素子の印加電圧に伴う色合いの変化を従来素子と比較して示す。図中横軸は印加電圧(V)を示し、縦軸はCIE色度座標のX又はY座標を示してある。これより、本発明素子は色度Xにおいて、従来素子に比べ印加電圧が増加しても色合いの変化が抑えられているのが判る。
【0034】
さらに、本発明素子に関しては寿命特性が向上しており、5mA/cm2の定電流駆動において良好な結果が得られている。図3に本発明素子の素子寿命特性を示す。図中横軸は駆動時間(Hr)を示し、縦軸は相対輝度を示してある。これより、本発明素子は、3,000時間経過しても初期輝度の90%以上を維持するほどの寿命特性であることが判る。また、ダークスポット(非発光部)もほとんど観察されなかった。
【0035】
(比較例1)
特開平10−72581では、発光層として前記化合物1の芳香族アミン誘導体に、赤色発光材料を重量比で1%添加することにより、参考例1とほぼ同レベルの最大発光効率4lm/W、最高輝度38,000cd/m2の赤色発光が得られている。しかしながら、この素子の寿命は短く、3mA/cm2の連続発光で、1,000時間程度しか安定な発光は確認されておらず、実用化は困難である。
【0036】
(比較例2)
特開平10−330295では、発光層として前記化合物2のジベンゾテトラフェニルペリフランテンを単独で用いた場合、15Vの直流電圧の印加で輝度1,250cd/m2の赤色発光が得られている。また、4,4'−ビス〔N−フェニル−N−(1"−ナフチル)アミノ〕ビフェニルに、前記化合物2のジベンゾテトラフェニルペリフランテンを重量比で5%添加することにより、15Vの直流電圧の印加で輝度2,650cd/m2の赤色発光が得られている。しかしながら、何れの例も本発明の素子に比べると非常に輝度が低く、実用化は困難である。
【0037】
(比較例3)
特開平11−233261では、発光層として前記化合物4のトリス(8−キノリノラート)アルミニウムに、前記化合物2のジベンゾテトラフェニルペリフランテンを重量比で8%添加することにより、印加電圧9.7Vで約52cd/m2の赤色発光が得られている。この素子における2,700時間の連続一定電流動作後の輝度は、30cd/m2までに減衰している。よって、本発明の素子に比べると非常に輝度が低く、寿命も短いことから、実用化は困難である。
【0038】
(比較例4)
特開平10−88121では、一般式[3]に示す金属錯体を発光層あるいは電子注入層として用いている。例えば、前記化合物3のガリウム金属錯体を電子注入層として用いた場合、直流電圧8Vで輝度1,5000cd/m2、発光効率2.35lm/Wの青緑色発光が得られている。しかしながら、本発明では一般式[3]に示す金属錯体を赤色素子の電子輸送層として用いることにより、高輝度、高効率、長寿命及び色度安定性をさらに向上させている。
【0039】
(比較例5)
特許公報第2828821号では、発光層にペリノン誘導体、電子輸送層にガリウム金属錯体であるトリス(2−メチル−8−キノリノラート)ガリウムを用いた素子について開示している。この素子は、16Vの直流電圧の印加で輝度850cd/m2の黄色発光が確認されており、発光寿命は4日間である。したがって、本発明の素子に比べると非常に輝度が低く、寿命も極めて短い。
【0040】
参考例2
電子輸送層6として、前記化合物4のトリス(8−キノリノラート)アルミニウムを使用する以外は、参考例1と同様の方法で有機EL素子を作製した。この有機EL素子の陽極2と陰極7の間に直流電圧を印加したところ、電流効率5cd/A以上(〜1,000cd/m2)、最高輝度35,000cd/m2の赤色発光が得られた。
【0041】
参考例3
発光層5として、前記化合物1の芳香族アミン誘導体に、前記式[2b]のジベンゾ[f,f']ジインデノ[1,2,3−cd:1',2',3'−lm]ペリレン誘導体を使用する以外は、参考例1と同様の方法で有機EL素子を作製した。この有機EL素子の陽極2と陰極7の間に直流電圧を印加したところ、電流効率5cd/A以上(〜1,000cd/m2)、最高輝度33,000cd/m2の赤色発光が得られた。
【0042】
実施例1
本実施例の有機EL素子は、発光層5として前記化合物1の芳香族アミン誘導体に、前記式[2b]の化合物を蒸着レート比で2.5%ドープした。電子輸送層6については、前記式[3a]のガリウム金属錯体を成膜することにより作製した。この有機EL素子の陽極2と陰極7の間に直流電圧を印加したところ、電流効率6.8cd/A以上(〜1,000cd/m2)、最高輝度45,000cd/m2の赤色発光が得られた。
【0043】
実施例2
電子輸送層6について、前記式[3a]及び式[3b]のガリウム金属錯体を混合して成膜すること以外は、実施例1と同様の方法で有機EL素子を作製した。式[3a]のガリウム金属錯体:式[3b]のガリウム金属錯体の混合比は重量比で9:1とした。この有機EL素子の陽極2と陰極7の間に直流電圧を印加したところ、電流効率6.6cd/A以上(〜1,000cd/m2)、最高輝度43,000cd/m2の赤色発光が得られた。
【0044】
参考例4
電子輸送層6について、前記化合物3のガリウム金属錯体を成膜すること以外は、実施例1と同様の方法で有機EL素子を作製した。この有機EL素子の陽極2と陰極7の間に直流電圧を印加したところ、電流効率6cd/A以上(〜1,000cd/m2)、最高輝度38,000cd/m2の赤色発光が得られた。
【0045】
実施例3
本実施例の有機EL素子は、発光層5として前記化合物1の芳香族アミン誘導体に、前記式[2a]の化合物を蒸着レート比で2.5%ドープした。電子輸送層6については、前記式[3a]のガリウム金属錯体を成膜することにより作製した。この有機EL素子の陽極2と陰極7の間に直流電圧を印加したところ、電流効率6.5cd/A以上(〜1,000cd/m2)、最高輝度42,000cd/m2の赤色発光が得られた。
【0046】
実施例4
電子輸送層6について、前記式[3a]及び式[3b]のガリウム金属錯体を混合して成膜すること以外は、実施例3と同様の方法で有機EL素子を作製した。式[3a]のガリウム金属錯体:式[3b]のガリウム金属錯体の混合比は重量比で9:1とした。この有機EL素子の陽極2と陰極7の間に直流電圧を印加したところ、電流効率6.4cd/A以上(〜1,000cd/m2)、最高輝度41,000cd/m2の赤色発光が得られた。
【0047】
参考例5
電子輸送層6について、前記化合物3のガリウム金属錯体を成膜すること以外は、実施例3と同様の方法で有機EL素子を作製した。この有機EL素子の陽極2と陰極7の間に直流電圧を印加したところ、電流効率5.8cd/A以上(〜1,000cd/m2)、最高輝度37,000cd/m2の赤色発光が得られた。
【0048】
参考例1、4、5、及び実施例1〜4の有機EL素子の特性を表1に示す。
【表1】
Figure 0003688207
【0049】
実施例5
本実施例の有機EL素子は、発光層5として前記化合物1の芳香族アミン誘導体に、前記化合物2のジベンゾテトラフェニルペリフランテンを蒸着レート比で2.5%ドープした。電子輸送層6については、前記式[3a]のガリウム金属錯体を成膜することにより作製した。
【0050】
ここで図4に、実施例5の素子のL−V特性及びJ−V特性を従来素子と比較して示す。従来素子は、発光層5として前記化合物4のトリス(8−キノリノラート)アルミニウムに下記化合物5の赤色ドーパント(DCM)をドープし、電子輸送層6については前記化合物4のトリス(8−キノリノラート)アルミニウムを成膜したものである。図4より、実施例5の素子は、従来の赤色素子よりも低電圧化が可能であることがわかる。
【化31】
Figure 0003688207
【0051】
以上説明した本実施例によれば、発光層において、特定の芳香族アミン誘導体と、赤色発光材料である特定のジベンゾ{[f,f']−4,4',7,7'−テトラフェニル}ジインデノ[1,2,3−cd:1',2',3'−lm]ペリレン誘導体とを混合させることにより、発光層においてより良好なホール輸送性能(電子ブロック性能)を持たせることができる。この結果、発光層へのホール注入特性が上がり、発光層でのホール−電子の再結合収率が向上し、高輝度が得られる。また、発光層自身が電子ブロック層の働きもするので、電子が発光層を抜けることなく、色純度も向上する。さらに、比較的に長寿命特性を有するトリフェニルジアミン誘導体と非結晶材料のジベンゾ{[f,f']−4,4',7,7'−テトラフェニル}ジインデノ[1,2,3−cd:1',2',3'−lm]ペリレン誘導体とを組み合わせることにより、格段に寿命特性が向上する。
【0052】
また、電子輸送層としてイオン化ポテンシャルの大きい有機金属錯体を用いることにより、本発明の発光層のイオン化ポテンシャルに対し、電子輸送層のイオン化ポテンシャルを大きくすることができる。その結果、電子輸送層へのホール漏れを制御できるので、発光層でのホール−電子の再結合収率はさらに向上する。
【0053】
本発明は前記実施例に限定されるものではなく、例えば一般式[1]に示す芳香族アミン誘導体と、一般式[2]に示す赤色発光材料であるジベンゾ{[f,f']−4,4',7,7'−テトラフェニル}ジインデノ[1,2,3−cd:1',2',3'−lm]ペリレン誘導体とを混合させた発光層において、一般式[2]のジベンゾ{[f,f']−4,4',7,7'−テトラフェニル}ジインデノ[1,2,3−cd:1',2',3'−lm]ペリレン誘導体のドープ量の異なる発光層を2層以上設けることも可能である。また、このときのドープ量も1〜10%の範囲内に設定するのが好ましい。
【0054】
【発明の効果】
本発明は、以上のように構成され機能するので、従来に比べて、発光効率に優れ、輝度、色度の良好な赤色有機EL素子を得ることができる。また、寿命特性も格段に向上するので、長期的信頼性の高い有機ELディスプレイを提供することができる。
【図面の簡単な説明】
【図1】 本発明の一実施形態を示す有機EL素子の概略断面図である。
【図2】 本発明素子の印加電圧に伴う色合いの変化を従来素子と比較して示すグラフである。
【図3】 本発明素子の素子寿命特性を示すグラフである。
【図4】 実施例の素子のL−V特性及びJ−V特性を従来素子と比較して示すグラフである。
【図5】 従来の有機EL素子の概略断面図である。
【符号の説明】
1 ガラス基板
2 陽極
3 ホール注入層
4 ホール輸送層
5 発光層
6 電子輸送層
7 陰極[0001]
BACKGROUND OF THE INVENTION
  The present invention relates to an organic EL element (organic electroluminescence element). More specifically, the present invention relates to a red organic EL element having excellent luminous efficiency, luminance and chromaticity, and an organic EL display using the same.
[0002]
[Prior art]
  Conventionally, in an organic EL element, particularly a red organic EL element, the following general formula [a] having a high fluorescence quantum yield is generally used to obtain a practical level of luminance.
(Q)Three-Al ... [a]
[Q in General Formula [a] represents a substituted or unsubstituted 8-quinolinolato ligand. A luminescent organoaluminum complex of the following general formula [b]
Embedded image
Figure 0003688207
[A1 to A4 in the general formula [b] each independently represents an aryl group having 6 to 18 carbon atoms. R1 to R8 each independently represents a hydrogen atom, a halogen atom, an alkyl group, an alkoxy group, an aryl group or an amino group. ] Was used as a light emitting layer.
[0003]
  For example, in the organic EL device described in C.W.Tang: “An Overview of Organic Electroluminescent Materials and Devices”, SID 96DIGEST., 14.1, pp.181-184 (1996),
Embedded image
Figure 0003688207
Tris (8-quinolinolato) aluminum is used as a host, and a red light emitting material, DCJT, is doped into the light emitting layer. In JP-A-10-72581, an aromatic amine derivative represented by the general formula [b] is used as a host, and a red light emitting material is doped into the light emitting layer.
[0004]
  By the way, from a practical point of view, the current organic EL device must have a long lifetime and thermal stability, and for this purpose, a high heat resistance hole injection layer was used between the anode and the hole transport layer. . However, this improves the life characteristics, but deteriorates the hole injection characteristics into the light emitting layer. As a result, the recombination yield in the light emitting layer was lowered, and sufficient luminous efficiency could not be obtained. Furthermore, there is a problem that electrons leak from the light emitting layer due to the applied voltage, that is, the carrier balance changes, and the color changes when the hole transport layer itself emits light.
[0005]
  Here, a conventional organic EL element will be described with reference to the drawings. FIG. 5 is a cross-sectional view of an organic EL element. In FIG. 5, a conventional organic EL device has an anode (transparent electrode) 2 made of ITO (indium-tin oxide) formed on a glass substrate 1, and a hole injection layer 3, a hole transport layer 4, and a light emitting layer thereon. 5, an organic EL layer such as an electron transport layer 6 and a cathode 7 are formed. Here, the light emitting layer 5 has a light emitting organoaluminum complex (general formula [a]) having a high fluorescence quantum yield as a host, and is doped with a red material. At this time, a light-emitting organoaluminum complex (general formula [a]) having an electron transport property may be used as the electron transport layer 6.
[0006]
[Problems to be solved by the invention]
  Conventionally, since the hole injection layer for increasing heat resistance is used, the life characteristics are improved, but the hole injection characteristics to the light emitting layer are deteriorated. This causes a decrease in the hole-electron recombination yield in the light emitting layer, and causes a problem that sufficient light emission efficiency cannot be obtained. Furthermore, there has been a problem that as the voltage increases, electrons leak from the light emitting layer, and the hole transport layer itself emits light to change the color. Therefore, the conventional element configuration cannot provide an organic EL device having excellent luminous efficiency, high luminance, and stable chromaticity at all times. This is because the hole injection property into the light emitting layer is low, the electron transport property changes as the voltage increases, and hole-electron recombination that should originally occur in the light emitting layer occurs in the hole transport layer. It was.
[0007]
  The present invention has been made in view of the above-described circumstances, and an object of the present invention is to provide a red organic EL element having excellent luminous efficiency and good luminance and chromaticity.
[0008]
[Means for Solving the Problems]
  In order to achieve the object, the present invention provides organic EL elements and organic EL displays shown in the following (1) to (15).
[0009]
(1) A light emitting layer comprising at least a single layer or a plurality of layers of organic thin films between an anode and a cathode facing each otherAnd an electron injection layer or an electron transport layerIn the organic EL device having the following general formula [1]
[Chemical 1]
Figure 0003688207
[R1 to R28 in the general formula [1] are each independently a hydrogen atom, a halogen atom, a substituted or unsubstituted alkyl group, a substituted or unsubstituted alkoxy group, a substituted or unsubstituted aryl group, Represents an unsubstituted amino group. Y1 to Y4 are each independently O, S, SO2, C = O, CH2O, CH2OCH2Or a substituted or unsubstituted alkylene group. R1 to R4 and R5 to R8 may be bonded to each other to form a saturated or unsaturated 5-membered ring or 6-membered ring. And an aromatic amine derivative represented by the following general formula [2]
[Chemical 2]
Figure 0003688207
[X1 to X20 in the general formula [2] are each independently a hydrogen atom, a halogen atom, a substituted or unsubstituted alkyl group, a substituted or unsubstituted alkoxy group, a substituted or unsubstituted aryl group, or a substituted or Represents an unsubstituted amino group. X1 to X20 may be bonded to each other to form a saturated or unsaturated 5-membered ring or 6-membered ring. And a dibenzo {[f, f ′]-4,4 ′, 7,7′-tetraphenyl} diindeno [1,2,3-cd: 1 ′, 2 ′, 3′-lm] perylene derivative represented by Having at least one light emitting layer mixed with,
The electron injection layer or the electron transport layer has the following general formula [3]
Embedded image
Figure 0003688207
[M in the general formula [3] represents a metal atom. R 1 ~ R Three , R Five And R 6 Each independently represents a hydrogen atom, a halogen atom, a substituted or unsubstituted alkyl group, a substituted or unsubstituted alkoxy group, a substituted or unsubstituted aryl group, a substituted or unsubstituted aryloxy group, a substituted or unsubstituted cyclo Represents an alkyl group or a cyano group. L has a halogen atom, a substituted or unsubstituted alkoxy group, a substituted or unsubstituted aryloxy group, a substituted or unsubstituted alkyl group, a substituted or unsubstituted aryloxy group, or a substituted or unsubstituted cycloalkyl group Represents a ligand, R Four Represents an aryl group. An organometallic complex represented byAn organic EL device characterized by that.
[0010]
(2)In an organic EL device having a light emitting layer composed of at least a single layer or a plurality of layers of an organic thin film and an electron injection layer or an electron transport layer between an anode and a cathode facing each other, the following general formula [1]
[Chemical 1]
Figure 0003688207
[R in General Formula [1] 1 ~ R 28 Each independently represents a hydrogen atom, a halogen atom, a substituted or unsubstituted alkyl group, a substituted or unsubstituted alkoxy group, a substituted or unsubstituted aryl group, or a substituted or unsubstituted amino group. Y 1 ~ Y Four Are independently O, S, SO 2 , C = O, CH 2 O, CH 2 OCH 2 Or a substituted or unsubstituted alkylene group. R 1 ~ R Four , R Five ~ R 8 May combine with each other to form a saturated or unsaturated 5-membered or 6-membered ring. And an aromatic amine derivative represented by the following general formula [2]
[Chemical 2]
Figure 0003688207
[X in General Formula [2] 1 ~ X 20 Each independently represents a hydrogen atom, a halogen atom, a substituted or unsubstituted alkyl group, a substituted or unsubstituted alkoxy group, a substituted or unsubstituted aryl group, or a substituted or unsubstituted amino group. X 1 ~ X 20 May combine with each other to form a saturated or unsaturated 5-membered or 6-membered ring. ] Dibenzo {[f, f ' ] -4, 4 ' , 7,7 ' -Tetraphenyl} diindeno [1,2,3-cd: 1 ' , 2 ' , 3 ' -Lm] having at least one light emitting layer mixed with a perylene derivative,
The electron injection layer or the electron transport layer has the following general formula [3]
Embedded image
Figure 0003688207
[M in the general formula [3] represents a metal atom. R 1 ~ R 6 Each independently represents a hydrogen atom, a halogen atom, a substituted or unsubstituted alkyl group, a substituted or unsubstituted alkoxy group, a substituted or unsubstituted aryl group, a substituted or unsubstituted aryloxy group, a substituted or unsubstituted cyclo Represents an alkyl group or a cyano group. L has a halogen atom, a substituted or unsubstituted alkoxy group, a substituted or unsubstituted aryloxy group, a substituted or unsubstituted alkyl group, a substituted or unsubstituted aryloxy group, or a substituted or unsubstituted cycloalkyl group Represents a ligand. ] The organic EL element characterized by including multiple types of organometallic complexes shown by this.
[0011]
(3)The aromatic amine derivative represented by the general formula [1] is represented by the following general formula [4].
[Chemical Formula 3]
Figure 0003688207
[R in General Formula [4] 1 ~ R 28 Each independently represents a hydrogen atom, a halogen atom, a substituted or unsubstituted alkyl group, a substituted or unsubstituted alkoxy group, a substituted or unsubstituted aryl group, or a substituted or unsubstituted amino group. Y 1 ~ Y Four Are independently O, S, SO 2 , C = O, CH 2 O, CH 2 OCH 2 Or a substituted or unsubstituted alkylene group. R 1 ~ R Four , R Five ~ R 8 May combine with each other to form a saturated or unsaturated 5-membered or 6-membered ring. The organic EL device according to (1) or (2), wherein the organic EL device is an aromatic amine derivative represented by the formula:
[0012]
(4)The aromatic amine derivative represented by the general formula [1] is represented by the following general formula [5].
[Chemical formula 5]
Figure 0003688207
[R in general formula [5] 1 ~ R 28 Each independently represents a hydrogen atom, a halogen atom, a substituted or unsubstituted alkyl group, a substituted or unsubstituted alkoxy group, a substituted or unsubstituted aryl group, or a substituted or unsubstituted amino group. X 1 ~ X 8 Represents a substituted or unsubstituted alkyl group having 1 to 20 carbon atoms or a substituted or unsubstituted aryl group having 6 to 16 carbon atoms. R 1 ~ R Four , R Five ~ R 8 May combine with each other to form a saturated or unsaturated 5-membered or 6-membered ring. The organic EL device according to (1) or (2), wherein the organic EL device is an aromatic amine derivative represented by the formula:
[0013]
(5)In an organic EL device having a light emitting layer composed of at least a single layer or a plurality of layers of an organic thin film and an electron injection layer or an electron transport layer between an anode and a cathode facing each other, the following general formula [6]
[Chemical 7]
Figure 0003688207
[R in General Formula [6] 1 ~ R 28 Each independently represents a hydrogen atom, a halogen atom, a substituted or unsubstituted alkyl group, a substituted or unsubstituted alkoxy group, a substituted or unsubstituted aryl group, or a substituted or unsubstituted amino group. R 1 ~ R Four , R Five ~ R 8 May combine with each other to form a saturated or unsaturated 5-membered or 6-membered ring. And an aromatic amine derivative represented by the following general formula [2]
[Chemical 8]
Figure 0003688207
[X in General Formula [2] 1 ~ X 20 Each independently represents a hydrogen atom, a halogen atom, a substituted or unsubstituted alkyl group, a substituted or unsubstituted alkoxy group, a substituted or unsubstituted aryl group, or a substituted or unsubstituted amino group. X 1 ~ X 20 May combine with each other to form a saturated or unsaturated 5-membered or 6-membered ring. ] Dibenzo {[f, f ' ] -4, 4 ' , 7,7 ' -Tetraphenyl} diindeno [1,2,3-cd: 1 ' , 2 ' , 3 ' -Lm] having at least one light emitting layer mixed with a perylene derivative,
The electron injection layer or the electron transport layer has the following general formula [3]
Embedded image
Figure 0003688207
[M in the general formula [3] represents a metal atom. R 1 ~ R Three , R Five And R 6 Each independently represents a hydrogen atom, a halogen atom, a substituted or unsubstituted alkyl group, a substituted or unsubstituted alkoxy group, a substituted or unsubstituted aryl group, a substituted or unsubstituted aryloxy group, a substituted or unsubstituted cyclo Represents an alkyl group or a cyano group. L has a halogen atom, a substituted or unsubstituted alkoxy group, a substituted or unsubstituted aryloxy group, a substituted or unsubstituted alkyl group, a substituted or unsubstituted aryloxy group, or a substituted or unsubstituted cycloalkyl group Represents a ligand, R Four Represents an aryl group. ] The organic EL element characterized by including the organometallic complex shown by this.
[0014]
(6)In an organic EL device having a light emitting layer composed of at least a single layer or a plurality of layers of an organic thin film and an electron injection layer or an electron transport layer between an anode and a cathode facing each other, the following general formula [6]
[Chemical 7]
Figure 0003688207
[R in General Formula [6] 1 ~ R 28 Each independently represents a hydrogen atom, a halogen atom, a substituted or unsubstituted alkyl group, a substituted or unsubstituted alkoxy group, a substituted or unsubstituted aryl group, or a substituted or unsubstituted amino group. R 1 ~ R Four , R Five ~ R 8 May combine with each other to form a saturated or unsaturated 5-membered or 6-membered ring. And an aromatic amine derivative represented by the following general formula [2]
[Chemical 8]
Figure 0003688207
[X in General Formula [2] 1 ~ X 20 Each independently represents a hydrogen atom, a halogen atom, a substituted or unsubstituted alkyl group, a substituted or unsubstituted alkoxy group, a substituted or unsubstituted aryl group, or a substituted or unsubstituted amino group. X 1 ~ X 20 May combine with each other to form a saturated or unsaturated 5-membered or 6-membered ring. ] Dibenzo {[f, f ' ] -4, 4 ' , 7,7 ' -Tetraphenyl} diindeno [1,2,3-cd: 1 ' , 2 ' , 3 ' -Lm] having at least one light emitting layer mixed with a perylene derivative,
The electron injection layer or the electron transport layer has the following general formula [3]
Embedded image
Figure 0003688207
[M in the general formula [3] represents a metal atom. R 1 ~ R 6 Each independently represents a hydrogen atom, a halogen atom, a substituted or unsubstituted alkyl group, a substituted or unsubstituted alkoxy group, a substituted or unsubstituted aryl group, a substituted or unsubstituted aryloxy group, a substituted or unsubstituted cyclo Represents an alkyl group or a cyano group. L has a halogen atom, a substituted or unsubstituted alkoxy group, a substituted or unsubstituted aryloxy group, a substituted or unsubstituted alkyl group, a substituted or unsubstituted aryloxy group, or a substituted or unsubstituted cycloalkyl group Represents a ligand. ] The organic EL element characterized by including multiple types of organometallic complexes shown by this.
[0015]
(7)Dibenzo {[f, f of general formula [2] ' ] -4, 4 ' , 7,7 ' -Tetraphenyl} diindeno [1,2,3-cd: 1 ' , 2 ' , 3 ' The organic EL device according to (1), (2), (5), and (6), wherein the -lm] perylene derivative is a compound represented by the following formula [2a].
[Chemical 9]
Figure 0003688207
[0016]
(8)Dibenzo {[f, f of general formula [2] ' ] -4, 4 ' , 7,7 ' -Tetraphenyl} diindeno [1,2,3-cd: 1 ' , 2 ' , 3 ' The organic EL device according to (1), (2), (5), and (6), wherein the -lm] perylene derivative is a compound represented by the following formula [2b].
Embedded image
Figure 0003688207
[0017]
(9)The aromatic amine derivative of the general formula [1], [4], [5] or [6] is used as a host, and the dibenzo {[f, f ' ] -4, 4 ' , 7,7 ' -Tetraphenyl} diindeno [1,2,3-cd: 1 ' , 2 ' , 3 ' -Lm] The organic EL device according to (1), (2), (5), and (6), wherein the perylene derivative is doped and the doping ratio is 1 to 10%.
[0018]
(10) The organometallic complex of the general formula [3] is a compound represented by the following formula [3a](1), (5)Organic EL element.
Embedded image
Figure 0003688207
[0019]
(11) The organometallic complex represented by the general formula [3] is a compound represented by the following formula [3b](1), (5)Organic EL element.
Embedded image
Figure 0003688207
[0020]
(12) The electron injection layer or the electron transport layer includes a plurality of types of organometallic complexes represented by the general formula [3].(1), (5), (10), and (11)The organic EL element as described in.
[0021]
(13) The organic EL device according to (12), wherein the electron injection layer or the electron transport layer contains a compound represented by the following formula [3a] and a compound represented by the following formula [3b].
Embedded image
Figure 0003688207
Embedded image
Figure 0003688207
[0022]
(14) The electron injection layer or the electron transport layer has the following general formula [a]
(Q)Three-Al ... [a]
[Q in General Formula [a] represents a substituted or unsubstituted 8-quinolinolato ligand. A luminescent organoaluminum complex represented by the formula (1):, (2), (5), (6), (10), and (11)The organic EL element as described in.
[0023]
(15) An organic EL display comprising the organic EL elements of (1) to (14).
[0024]
  In the light emitting layer, the present invention provides an aromatic amine derivative represented by the general formulas [1], [4], [5], and [6] and a red light emitting material dibenzo {[f] represented by the general formula [2]. , F ′]-4,4 ′, 7,7′-tetraphenyl} diindeno [1,2,3-cd: 1 ′, 2 ′, 3′-lm] perylene derivatives, and better High hole transport performance (electronic block performance) and moderately quenching the concentration quenching of red light-emitting materials. As a result, the red organic EL device has excellent luminous efficiency and good brightness and chromaticity. Can be obtained.
[0025]
  Further, the aromatic amine derivative having a long life characteristic as a green light emitting material and the dibenzo {[f, f ′]-4,4 ′, 7,7′-tetraphenyl} diindeno [1,2] which is an amorphous material. , 3-cd: 1 ′, 2 ′, 3′-lm] perylene derivative, the life characteristics can be further improved.
[0026]
  Furthermore, when a plurality of types of organometallic complexes represented by the general formula [3] are contained in the electron injection layer or the electron transport layer, the luminance can be kept high. That is, when only one kind of the above organometallic complex is used in the electron injection layer or the electron transport layer, the aggregation and crystallization of the thin film progresses when used at a high temperature for a long time, and the electron injection property or the electron transport property is deteriorated. Tend. On the other hand, when two or more of the above organometallic complexes are contained, the amorphousness (amorphous) becomes high, so that aggregation and crystallization hardly occur even when used for a long time. Therefore, electron injection characteristics or electron transport characteristics Can be suppressed.
[0027]
DETAILED DESCRIPTION OF THE INVENTION
  Next, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a schematic sectional view of an organic EL device showing one embodiment of the present invention. In FIG. 1, this organic EL element has an anode (transparent electrode) 2 made of ITO (indium-tin oxide) formed on a glass substrate 1, and a hole injection layer 3, a hole transport layer 4, and a light emitting layer 5 formed thereon. Further, an organic EL layer such as an electron transport layer 6 and a cathode 7 are formed. In order to give the element heat resistance, a hole injection layer for increasing heat resistance is provided as the hole injection layer 3.
[0028]
  Here, in the element of the present invention, the aromatic amine derivative of the general formula [1] and the dibenzo {[f, f ′]-4, 4 ′ of the general formula [2] which is a red light-emitting material with respect to the light-emitting layer 5. , 7,7′-Tetraphenyl} diindeno [1,2,3-cd: 1 ′, 2 ′, 3′-lm] perylene derivatives are used in admixture. At this time, doping with dibenzo {[f, f ′]-4,4 ′, 7,7′-tetraphenyl} diindeno [1,2,3-cd: 1 ′, 2 ′, 3′-lm] perylene derivative The amount is controlled by the vapor deposition rate, and the dope amount is preferably about 1 to 10% with respect to the aromatic amine derivative in order to suppress concentration quenching of the dye itself.
[0029]
  By the way, the compound represented by the general formula [1] of the present invention can be synthesized by a known method. For example, by reacting an anthracene derivative, anthraquinone derivative, or the like with a substituted or unsubstituted amine derivative and potassium carbonate, sodium carbonate, potassium hydroxide, sodium hydroxide, or the like in a solvent such as benzene, toluene, or xylene. Can be synthesized. Examples of the catalyst include copper powder, cuprous chloride, tin, stannous chloride, and pyridine. The compound represented by the general formula [2] of the present invention can also be synthesized by a known method. For example, it can be synthesized by reacting a benzo [k] fluoranthene derivative in the presence of aluminum chloride / sodium chloride, cobalt fluoride, thallium trifluoroacetate and the like.
[0030]
  Next, the hole blocking performance in the electron transport layer can be further increased by using an organometallic complex having a large ionization potential represented by the general formula [3] for the electron transport layer 6. The electron transport material represented by the general formula [3] can be synthesized by a known method. For example, a gallium compound and a compound having a ligand residue of L in the parentheses of the general formula [3] can be synthesized as raw materials. In other words, alkyl gallium, gallium alkoxide, gallium halide, gallium nitride, gallium oxide, etc., and quinoline residues such as 8-hydroxyquinoline and 2-methyl-8-hydroxyquinoline as ligands in parentheses of the general formula [3] 2-coordinate group, 1-coordinate residue having halogen atom, substituted or unsubstituted alkoxy group, aryloxy group, alkyl group as L ligand, under solvent such as methanol, ethanolbenzene, toluene, tetrahydrofuran, etc. React with.
[0031]
  EXAMPLES Hereinafter, although this invention is demonstrated with reference to an Example, this invention is not limited to a following example, unless the summary of this invention is changed.
[0032]
  (Reference example 1)
  The organic EL device of this example has the following compound 1 as the light emitting layer 5.
Embedded image
Figure 0003688207
In the aromatic amine derivative of
Embedded image
Figure 0003688207
Of dibenzotetraphenylperiflanthene was doped at a deposition rate ratio of 2.5%. For the electron transport layer 6, the following compound 3
Embedded image
Figure 0003688207
The gallium metal complex was prepared by forming a film. As a result, current efficiency of 6 cd / A or more (˜1,000 cd / m2), Maximum brightness of 38,000 cd / m2A practical red light emission level was obtained. In addition, this element had good chromaticity stability, and the change in hue with applied voltage was small.
[0033]
  Here, FIG. 2 shows a change in hue with the applied voltage of the element of the present invention in comparison with the conventional element. In the figure, the horizontal axis indicates the applied voltage (V), and the vertical axis indicates the X or Y coordinates of the CIE chromaticity coordinates. From this, it can be seen that, in the chromaticity X of the present invention element, the change in hue is suppressed even when the applied voltage is increased as compared with the conventional element.
[0034]
  Furthermore, the lifetime characteristics of the element of the present invention are improved, and 5 mA / cm.2Good results were obtained in constant current driving. FIG. 3 shows element lifetime characteristics of the element of the present invention. In the figure, the horizontal axis represents drive time (Hr), and the vertical axis represents relative luminance. From this, it can be seen that the element of the present invention has a life characteristic enough to maintain 90% or more of the initial luminance even after 3,000 hours. In addition, dark spots (non-light emitting portions) were hardly observed.
[0035]
(Comparative Example 1)
  In JP-A-10-72581, by adding 1% by weight of a red light emitting material to the aromatic amine derivative of Compound 1 as a light emitting layer,Reference example 1And the maximum luminous efficiency of 4lm / W and the maximum brightness of 38,000cd / m.2The red light emission is obtained. However, the lifetime of this element is short, 3 mA / cm.2In this continuous light emission, stable light emission has been confirmed for only about 1,000 hours, and practical application is difficult.
[0036]
(Comparative Example 2)
  In Japanese Patent Laid-Open No. 10-330295, when dibenzotetraphenyl perifuranthene of Compound 2 is used alone as the light emitting layer, the luminance is 1,250 cd / m when a DC voltage of 15 V is applied.2The red light emission is obtained. Further, by adding 5% by weight of dibenzotetraphenylperifuranthene of the compound 2 to 4,4′-bis [N-phenyl-N- (1 ″ -naphthyl) amino] biphenyl, a direct current of 15 V can be obtained. Luminance of 2,650 cd / m with application of voltage2The red light emission is obtained. However, each example has a very low luminance as compared with the element of the present invention, and is difficult to put into practical use.
[0037]
(Comparative Example 3)
  In JP-A-11-233261, by adding 8% by weight of dibenzotetraphenylperifuranthene of Compound 2 to tris (8-quinolinolato) aluminum of Compound 4 as a light emitting layer, an applied voltage of 9.7V is obtained. About 52cd / m2The red light emission is obtained. The luminance after continuous constant current operation for 2,700 hours in this device is 30 cd / m.2It has decayed until. Therefore, compared with the element of the present invention, the luminance is very low and the lifetime is short, so that practical application is difficult.
[0038]
(Comparative Example 4)
  In JP-A-10-88121, a metal complex represented by the general formula [3] is used as a light emitting layer or an electron injection layer. For example, when the gallium metal complex of Compound 3 is used as an electron injection layer, the luminance is 1,5000 cd / m at a DC voltage of 8V.2Blue-green light emission with a luminous efficiency of 2.35 lm / W is obtained. However, in the present invention, by using the metal complex represented by the general formula [3] as the electron transport layer of the red element, the high luminance, high efficiency, long life and chromaticity stability are further improved.
[0039]
(Comparative Example 5)
  Japanese Patent No. 28288821 discloses a device using a perinone derivative for a light emitting layer and tris (2-methyl-8-quinolinolato) gallium which is a gallium metal complex for an electron transport layer. This device has a luminance of 850 cd / m when a DC voltage of 16 V is applied.2Yellow emission was confirmed, and the emission lifetime was 4 days. Therefore, the luminance is very low and the lifetime is extremely short as compared with the element of the present invention.
[0040]
(Reference example 2)
  As the electron transport layer 6, except that tris (8-quinolinolato) aluminum of the compound 4 is used,Reference example 1An organic EL device was produced in the same manner as described above. When a DC voltage was applied between the anode 2 and the cathode 7 of the organic EL element, the current efficiency was 5 cd / A or more (˜1,000 cd / m).2), Maximum brightness of 35,000 cd / m2Of red light emission was obtained.
[0041]
(Reference example 3)
  As the light emitting layer 5, the aromatic amine derivative of the compound 1 was added to the dibenzo [f, f ′] diindeno [1,2,3-cd: 1 ′, 2 ′, 3′-lm] perylene of the formula [2b]. Except for using derivatives,Reference example 1An organic EL device was produced in the same manner as described above. When a DC voltage was applied between the anode 2 and the cathode 7 of the organic EL element, the current efficiency was 5 cd / A or more (˜1,000 cd / m).2), Maximum brightness of 33,000 cd / m2Of red light emission was obtained.
[0042]
(Example 1)
  In the organic EL device of this example, the compound of the formula [2b] was doped by 2.5% with the deposition rate ratio of the aromatic amine derivative of the compound 1 as the light emitting layer 5. The electron transport layer 6 was produced by forming a film of the gallium metal complex of the formula [3a]. When a DC voltage was applied between the anode 2 and the cathode 7 of this organic EL element, the current efficiency was 6.8 cd / A or more (˜1,000 cd / m).2), Maximum brightness of 45,000 cd / m2Of red light emission was obtained.
[0043]
(Example 2)
  About the electron carrying layer 6, except mixing the gallium metal complex of said Formula [3a] and Formula [3b], and forming into a film,Example 1An organic EL device was produced in the same manner as described above. The mixing ratio of the gallium metal complex of the formula [3a]: the gallium metal complex of the formula [3b] was 9: 1 by weight. When a DC voltage was applied between the anode 2 and the cathode 7 of the organic EL element, the current efficiency was 6.6 cd / A or more (˜1,000 cd / m).2), Maximum brightness of 43,000 cd / m2Of red light emission was obtained.
[0044]
(Reference example 4)
  For the electron transport layer 6, except that the gallium metal complex of the compound 3 is formed,Example 1An organic EL device was produced in the same manner as described above. When a DC voltage was applied between the anode 2 and the cathode 7 of this organic EL element, the current efficiency was 6 cd / A or more (˜1,000 cd / m).2), Maximum brightness of 38,000 cd / m2Of red light emission was obtained.
[0045]
(Example 3)
  In the organic EL device of this example, the compound of formula [2a] was doped with the aromatic amine derivative of Compound 1 as the light-emitting layer 5 by 2.5% in a deposition rate ratio. The electron transport layer 6 was produced by forming a film of the gallium metal complex of the formula [3a]. When a DC voltage was applied between the anode 2 and the cathode 7 of this organic EL element, the current efficiency was 6.5 cd / A or more (up to 1,000 cd / m).2), Maximum brightness of 42,000 cd / m2Of red light emission was obtained.
[0046]
(Example 4)
  About the electron carrying layer 6, except mixing the gallium metal complex of said Formula [3a] and Formula [3b], and forming into a film,Example 3An organic EL device was produced in the same manner as described above. The mixing ratio of the gallium metal complex of the formula [3a]: the gallium metal complex of the formula [3b] was 9: 1 by weight. When a DC voltage was applied between the anode 2 and the cathode 7 of the organic EL element, the current efficiency was 6.4 cd / A or more (˜1,000 cd / m).2), Maximum brightness of 41,000 cd / m2Of red light emission was obtained.
[0047]
(Reference Example 5)
  For the electron transport layer 6, except that the gallium metal complex of the compound 3 is formed,Example 3An organic EL device was produced in the same manner as described above. When a DC voltage was applied between the anode 2 and the cathode 7 of this organic EL element, the current efficiency was 5.8 cd / A or more (˜1,000 cd / m).2), Maximum brightness of 37,000 cd / m2Of red light emission was obtained.
[0048]
  Reference Examples 1, 4, 5 and Examples 1-4Table 1 shows the characteristics of the organic EL element.
[Table 1]
Figure 0003688207
[0049]
(Example 5)
  In the organic EL device of this example, the aromatic amine derivative of Compound 1 as the light-emitting layer 5 was doped with 2.5% of the compound 2 dibenzotetraphenylperifuranthene at a deposition rate ratio. The electron transport layer 6 was produced by forming a film of the gallium metal complex of the formula [3a].
[0050]
  Here in FIG.Example 5The LV characteristic and JV characteristic of this element are shown in comparison with the conventional element. In the conventional device, tris (8-quinolinolato) aluminum of the compound 4 is doped with a red dopant (DCM) of the following compound 5 as the light emitting layer 5, and tris (8-quinolinolato) aluminum of the compound 4 is used for the electron transport layer 6. Is formed into a film. From FIG.Example 5It can be seen that the voltage of the element can be lower than that of the conventional red element.
Embedded image
Figure 0003688207
[0051]
  According to the present embodiment described above, in the light emitting layer, a specific aromatic amine derivative and a specific dibenzo {[f, f ′]-4,4 ′, 7,7′-tetraphenyl which is a red light emitting material are used. } By mixing diindeno [1,2,3-cd: 1 ′, 2 ′, 3′-lm] perylene derivative, the light emitting layer can have better hole transport performance (electron blocking performance). it can. As a result, the hole injection property into the light emitting layer is improved, the hole-electron recombination yield in the light emitting layer is improved, and high luminance is obtained. Further, since the light emitting layer itself functions as an electron blocking layer, electrons do not pass through the light emitting layer, and the color purity is improved. Further, a triphenyldiamine derivative having a relatively long life characteristic and an amorphous material dibenzo {[f, f ′]-4,4 ′, 7,7′-tetraphenyl} diindeno [1,2,3-cd 1 ′, 2 ′, 3′-lm] perylene derivatives are combined to significantly improve the life characteristics.
[0052]
  Further, by using an organometallic complex having a large ionization potential as the electron transport layer, the ion transport potential of the electron transport layer can be increased with respect to the ionization potential of the light emitting layer of the present invention. As a result, since hole leakage to the electron transport layer can be controlled, the hole-electron recombination yield in the light emitting layer is further improved.
[0053]
  The present invention is not limited to the above-described embodiment. For example, an aromatic amine derivative represented by the general formula [1] and a dibenzo {[f, f ′]-4 that is a red light emitting material represented by the general formula [2]. , 4 ′, 7,7′-tetraphenyl} diindeno [1,2,3-cd: 1 ′, 2 ′, 3′-lm] perylene derivative mixed with a perylene derivative of the general formula [2] Dibenzo {[f, f ′]-4,4 ′, 7,7′-tetraphenyl} diindeno [1,2,3-cd: 1 ′, 2 ′, 3′-lm] different dope amounts of perylene derivatives It is possible to provide two or more light emitting layers. Moreover, it is preferable to set also the dope amount in this case in the range of 1 to 10%.
[0054]
【The invention's effect】
  Since the present invention is configured and functions as described above, it is possible to obtain a red organic EL element that is excellent in luminous efficiency, luminance, and chromaticity as compared with the prior art. In addition, since the life characteristics are remarkably improved, an organic EL display with high long-term reliability can be provided.
[Brief description of the drawings]
FIG. 1 is a schematic cross-sectional view of an organic EL device showing one embodiment of the present invention.
FIG. 2 is a graph showing a change in hue with an applied voltage of the element of the present invention in comparison with a conventional element.
FIG. 3 is a graph showing element lifetime characteristics of the element of the present invention.
FIG. 4 Example5It is a graph which shows the LV characteristic and JV characteristic of this element compared with a conventional element.
FIG. 5 is a schematic cross-sectional view of a conventional organic EL element.
[Explanation of symbols]
1 Glass substrate
2 Anode
3 Hole injection layer
4 hole transport layer
5 Light emitting layer
6 Electron transport layer
7 Cathode

Claims (15)

互いに対向する陽極と陰極間に、少なくとも単層又は複数層の有機薄膜よりなる発光層と、電子注入層又は電子輸送層を備えた有機EL素子において、下記一般式[1]
Figure 0003688207
[一般式[1]中のR1〜R28は、それぞれ独立に水素原子、ハロゲン原子、置換若しくは未置換のアルキル基、置換若しくは未置換のアルコキシ基、置換若しくは未置換のアリール基、又は、置換若しくは未置換のアミノ基を表す。Y1〜Y4は、それぞれ独立にO、S、SO2、C=O、CH2O、CH2OCH2、又は、置換若しくは未置換のアルキレン基を表す。R1〜R4、R5〜R8は、互いに結合して飽和若しくは不飽和の5員環又は6員環を形成してもよい。]で示される芳香族アミン誘導体と、下記一般式[2]
Figure 0003688207
[一般式[2]中のX1〜X20は、それぞれ独立に水素原子、ハロゲン原子、置換若しくは未置換のアルキル基、置換若しくは未置換のアルコキシ基、置換若しくは未置換のアリール基、又は、置換若しくは未置換のアミノ基を表す。X1〜X20は、互いに結合して飽和若しくは不飽和の5員環又は6員環を形成してもよい。]で示されるジベンゾ{[f,f’]−4,4’,7,7’−テトラフェニル}ジインデノ[1,2,3−cd:1’,2’,3’−lm]ペリレン誘導体とを混合させた少なくとも1層の発光層を有し、
前記電子注入層又は電子輸送層が、下記一般式[3]
Figure 0003688207
[一般式[3]中のMは金属原子を表す。R1〜R3、R5及びR6は、それぞれ独立に水素原子、ハロゲン原子、置換若しくは未置換のアルキル基、置換若しくは未置換のアルコキシ基、置換若しくは未置換のアリール基、置換若しくは未置換のアリールオキシ基、置換若しくは未置換のシクロアルキル基又はシアノ基を表す。Lは、ハロゲン原子、置換若しくは未置換のアルコキシ基、置換若しくは未置換のアリールオキシ基、置換若しくは未置換のアルキル基、置換若しくは未置換のアリールオキシ基又は置換若しくは未置換のシクロアルキル基を有する配位子を表し、R4がアリール基を表す。]で示される有機金属錯体を含む有機EL素子。
In an organic EL device having a light emitting layer composed of at least a single layer or a plurality of layers of an organic thin film and an electron injection layer or an electron transport layer between an anode and a cathode facing each other, the following general formula [1]
Figure 0003688207
[R1 to R28 in the general formula [1] are each independently a hydrogen atom, a halogen atom, a substituted or unsubstituted alkyl group, a substituted or unsubstituted alkoxy group, a substituted or unsubstituted aryl group, Represents an unsubstituted amino group. Y1~Y4 is, O each independently, S, SO 2, C = O, CH 2 O, CH 2 OCH 2, or a substituted or unsubstituted alkylene group. R1 to R4 and R5 to R8 may be bonded to each other to form a saturated or unsaturated 5-membered ring or 6-membered ring. And an aromatic amine derivative represented by the following general formula [2]
Figure 0003688207
[X1 to X20 in the general formula [2] are each independently a hydrogen atom, a halogen atom, a substituted or unsubstituted alkyl group, a substituted or unsubstituted alkoxy group, a substituted or unsubstituted aryl group, or a substituted or Represents an unsubstituted amino group. X1 to X20 may be bonded to each other to form a saturated or unsaturated 5-membered ring or 6-membered ring. And a dibenzo {[f, f ′]-4,4 ′, 7,7′-tetraphenyl} diindeno [1,2,3-cd: 1 ′, 2 ′, 3′-lm] perylene derivative represented by Having at least one light emitting layer mixed with
The electron injection layer or the electron transport layer has the following general formula [3]
Figure 0003688207
[M in the general formula [3] represents a metal atom. R1 to R3, R5 and R6 are each independently a hydrogen atom, a halogen atom, a substituted or unsubstituted alkyl group, a substituted or unsubstituted alkoxy group, a substituted or unsubstituted aryl group, a substituted or unsubstituted aryloxy group Represents a substituted or unsubstituted cycloalkyl group or a cyano group. L has a halogen atom, a substituted or unsubstituted alkoxy group, a substituted or unsubstituted aryloxy group, a substituted or unsubstituted alkyl group, a substituted or unsubstituted aryloxy group, or a substituted or unsubstituted cycloalkyl group Represents a ligand, and R4 represents an aryl group. ] The organic EL element containing the organometallic complex shown by this.
下記一般式[1]
Figure 0003688207
[一般式[1]中のR1〜R28は、それぞれ独立に水素原子、ハロゲン原子、置換若しくは未置換のアルキル基、置換若しくは未置換のアルコキシ基、置換若しくは未置換のアリール基、又は、置換若しくは未置換のアミノ基を表す。Y1〜Y4は、それぞれ独立にO、S、SO2、C=O、CH2O、CH2OCH2、又は、置換若しくは未置換のアルキレン基を表す。R1〜R4、R5〜R8は、互いに結合して飽和若しくは不飽和の5員環又は6員環を形成してもよい。]で示される芳香族アミン誘導体と、下記一般式[2]
Figure 0003688207
[一般式[2]中のX1〜X20は、それぞれ独立に水素原子、ハロゲン原子、置換若しくは未置換のアルキル基、置換若しくは未置換のアルコキシ基、置換若しくは未置換のアリール基、又は、置換若しくは未置換のアミノ基を表す。X1〜X20は、互いに結合して飽和若しくは不飽和の5員環又は6員環を形成してもよい。]で示されるジベンゾ{[f,f’]−4,4’,7,7’−テトラフェニル}ジインデノ[1,2,3−cd:1’,2’,3’−lm]ペリレン誘導体とを混合させた少なくとも1層の発光層を有し、
前記電子注入層又は電子輸送層が、下記一般式[3’
Figure 0003688207
[一般式[3’]中のMは金属原子を表す。R1〜R6は、それぞれ独立に水素原子、ハロゲン原子、置換若しくは未置換のアルキル基、置換若しくは未置換のアルコキシ基、置換若しくは未置換のアリール基、置換若しくは未置換のアリールオキシ基、置換若しくは未置換のシクロアルキル基又はシアノ基を表す。Lは、ハロゲン原子、置換若しくは未置換のアルコキシ基、置換若しくは未置換のアリールオキシ基、置換若しくは未置換のアルキル基、置換若しくは未置換のアリールオキシ基又は置換若しくは未置換のシクロアルキル基を有する配位子を表す。]で示される(ただし、式[3]で示される化合物を除く)有機金属錯体を更に含む請求項1に記載の有機EL素子。
The following general formula [1]
Figure 0003688207
[R1 to R28 in the general formula [1] are each independently a hydrogen atom, a halogen atom, a substituted or unsubstituted alkyl group, a substituted or unsubstituted alkoxy group, a substituted or unsubstituted aryl group, Represents an unsubstituted amino group. Y1~Y4 is, O each independently, S, SO 2, C = O, CH 2 O, CH 2 OCH 2, or a substituted or unsubstituted alkylene group. R1 to R4 and R5 to R8 may be bonded to each other to form a saturated or unsaturated 5-membered ring or 6-membered ring. And an aromatic amine derivative represented by the following general formula [2]
Figure 0003688207
[X1 to X20 in the general formula [2] are each independently a hydrogen atom, a halogen atom, a substituted or unsubstituted alkyl group, a substituted or unsubstituted alkoxy group, a substituted or unsubstituted aryl group, or a substituted or Represents an unsubstituted amino group. X1 to X20 may be bonded to each other to form a saturated or unsaturated 5-membered ring or 6-membered ring. And a dibenzo {[f, f ′]-4,4 ′, 7,7′-tetraphenyl} diindeno [1,2,3-cd: 1 ′, 2 ′, 3′-lm] perylene derivative represented by Having at least one light emitting layer mixed with
The electron injection layer or the electron transport layer is represented by the following general formula [ 3 ′ ].
Figure 0003688207
[M in the general formula [ 3 ′ ] represents a metal atom. R1 to R6 each independently represents a hydrogen atom, a halogen atom, a substituted or unsubstituted alkyl group, a substituted or unsubstituted alkoxy group, a substituted or unsubstituted aryl group, a substituted or unsubstituted aryloxy group, substituted or unsubstituted Represents a substituted cycloalkyl group or cyano group. L has a halogen atom, a substituted or unsubstituted alkoxy group, a substituted or unsubstituted aryloxy group, a substituted or unsubstituted alkyl group, a substituted or unsubstituted aryloxy group, or a substituted or unsubstituted cycloalkyl group Represents a ligand. The organic EL device according to claim 1, further comprising an organometallic complex represented by formula (excluding the compound represented by formula [3]) .
前記一般式[1]で示される芳香族アミン誘導体が、下記一般式[4]
Figure 0003688207
[一般式[4]中のR1〜R28は、それぞれ独立に水素原子、ハロゲン原子、置換若しくは未置換のアルキル基、置換若しくは未置換のアルコキシ基、置換若しくは未置換のアリール基、又は、置換若しくは未置換のアミノ基を表す。Y1〜Y4は、それぞれ独立にO、S、SO2、C=O、CH2O、CH2OCH2、又は、置換若しくは未置換のアルキレン基を表す。R1〜R4、R5〜R8は、互いに結合して飽和若しくは不飽和の5員環又は6員環を形成してもよい。]で示される芳香族アミン誘導体であることを特徴とする請求項1又は2に記載の有機EL素子。
The aromatic amine derivative represented by the general formula [1] is represented by the following general formula [4].
Figure 0003688207
[R1 to R28 in the general formula [4] are each independently a hydrogen atom, a halogen atom, a substituted or unsubstituted alkyl group, a substituted or unsubstituted alkoxy group, a substituted or unsubstituted aryl group, Represents an unsubstituted amino group. Y1~Y4 is, O each independently, S, SO 2, C = O, CH 2 O, CH 2 OCH 2, or a substituted or unsubstituted alkylene group. R1 to R4 and R5 to R8 may be bonded to each other to form a saturated or unsaturated 5-membered ring or 6-membered ring. The organic EL device according to claim 1, wherein the organic EL device is an aromatic amine derivative represented by the formula:
前記一般式[1]で示される芳香族アミン誘導体が、下記一般式[5]
Figure 0003688207
[一般式[5]中のR1〜R28は、それぞれ独立に水素原子、ハロゲン原子、置換若しくは未置換のアルキル基、置換若しくは未置換のアルコキシ基、置換若しくは未置換のアリール基、又は、置換若しくは未置換のアミノ基を表す。X1〜X8は、置換若しくは未置換の炭素数1〜20のアルキル基、又は、置換若しくは未置換の炭素数6〜16のアリール基を表す。R1〜R4、R5〜R8は、互いに結合して飽和若しくは不飽和の5員環又は6員環を形成してもよい。]で示される芳香族アミン誘導体であることを特徴とする請求項1又は2に記載の有機EL素子。
The aromatic amine derivative represented by the general formula [1] is represented by the following general formula [5].
Figure 0003688207
[R1 to R28 in General Formula [5] are each independently a hydrogen atom, a halogen atom, a substituted or unsubstituted alkyl group, a substituted or unsubstituted alkoxy group, a substituted or unsubstituted aryl group, Represents an unsubstituted amino group. X1 to X8 represent a substituted or unsubstituted alkyl group having 1 to 20 carbon atoms or a substituted or unsubstituted aryl group having 6 to 16 carbon atoms. R1 to R4 and R5 to R8 may be bonded to each other to form a saturated or unsaturated 5-membered ring or 6-membered ring. The organic EL device according to claim 1, wherein the organic EL device is an aromatic amine derivative represented by the formula:
互いに対向する陽極と陰極間に、少なくとも単層又は複数層の有機薄膜よりなる発光層と、電子注入層又は電子輸送層を備えた有機EL素子において、下記一般式[6]
Figure 0003688207
[一般式[6]中のR1〜R28は、それぞれ独立に水素原子、ハロゲン原子、置換若しくは未置換のアルキル基、置換若しくは未置換のアルコキシ基、置換若しくは未置換のアリール基、又は、置換若しくは未置換のアミノ基を表す。R1〜R4、R5〜R8は、互いに結合して飽和若しくは不飽和の5員環又は6員環を形成してもよい。]で示される芳香族アミン誘導体と、下記一般式[2]
Figure 0003688207
[一般式[2]中のX1〜X20は、それぞれ独立に水素原子、ハロゲン原子、置換若しくは未置換のアルキル基、置換若しくは未置換のアルコキシ基、置換若しくは未置換のアリール基、又は、置換若しくは未置換のアミノ基を表す。X1〜X20は、互いに結合して飽和若しくは不飽和の5員環又は6員環を形成してもよい。]で示されるジベンゾ{[f,f’]−4,4’,7,7’−テトラフェニル}ジインデノ[1,2,3−cd:1’,2’,3’−lm]ペリレン誘導体とを混合させた少なくとも1層の発光層を有し、
前記電子注入層又は電子輸送層が、下記一般式[3]
Figure 0003688207
[一般式[3]中のMは金属原子を表す。R1〜R3,R5及びR6は、それぞれ独立に水素原子、ハロゲン原子、置換若しくは未置換のアルキル基、置換若しくは未置換のアルコキシ基、置換若しくは未置換のアリール基、置換若しくは未置換のアリールオキシ基、置換若しくは未置換のシクロアルキル基又はシアノ基を表す。Lは、ハロゲン原子、置換若しくは未置換のアルコキシ基、置換若しくは未置換のアリールオキシ基、置換若しくは未置換のアルキル基、置換若しくは未置換のアリールオキシ基又は置換若しくは未置換のシクロアルキル基を有する配位子を表し、R4がアリール基を表す。]で示される有機金属錯体を含むことを特徴とする有機EL素子。
In an organic EL device having a light emitting layer composed of at least a single layer or a plurality of layers of an organic thin film and an electron injection layer or an electron transport layer between an anode and a cathode facing each other, the following general formula [6]
Figure 0003688207
[R1 to R28 in General Formula [6] are each independently a hydrogen atom, a halogen atom, a substituted or unsubstituted alkyl group, a substituted or unsubstituted alkoxy group, a substituted or unsubstituted aryl group, Represents an unsubstituted amino group. R1 to R4 and R5 to R8 may be bonded to each other to form a saturated or unsaturated 5-membered ring or 6-membered ring. And an aromatic amine derivative represented by the following general formula [2]
Figure 0003688207
[X1 to X20 in the general formula [2] are each independently a hydrogen atom, a halogen atom, a substituted or unsubstituted alkyl group, a substituted or unsubstituted alkoxy group, a substituted or unsubstituted aryl group, or a substituted or Represents an unsubstituted amino group. X1 to X20 may be bonded to each other to form a saturated or unsaturated 5-membered ring or 6-membered ring. And a dibenzo {[f, f ′]-4,4 ′, 7,7′-tetraphenyl} diindeno [1,2,3-cd: 1 ′, 2 ′, 3′-lm] perylene derivative represented by Having at least one light emitting layer mixed with
The electron injection layer or the electron transport layer has the following general formula [3]
Figure 0003688207
[M in the general formula [3] represents a metal atom. R1 to R3, R5 and R6 are each independently a hydrogen atom, a halogen atom, a substituted or unsubstituted alkyl group, a substituted or unsubstituted alkoxy group, a substituted or unsubstituted aryl group, a substituted or unsubstituted aryloxy group Represents a substituted or unsubstituted cycloalkyl group or a cyano group. L has a halogen atom, a substituted or unsubstituted alkoxy group, a substituted or unsubstituted aryloxy group, a substituted or unsubstituted alkyl group, a substituted or unsubstituted aryloxy group, or a substituted or unsubstituted cycloalkyl group Represents a ligand, and R4 represents an aryl group. ] The organic EL element characterized by including the organometallic complex shown by this.
下記一般式[6]
Figure 0003688207
[一般式[6]中のR1〜R28は、それぞれ独立に水素原子、ハロゲン原子、置換若しくは未置換のアルキル基、置換若しくは未置換のアルコキシ基、置換若しくは未置換のアリール基、又は、置換若しくは未置換のアミノ基を表す。R1〜R4、R5〜R8は、互いに結合して飽和若しくは不飽和の5員環又は6員環を形成してもよい。]で示される芳香族アミン誘導体と、下記一般式[2]
Figure 0003688207
[一般式[2]中のX1〜X20は、それぞれ独立に水素原子、ハロゲン原子、置換若しくは未置換のアルキル基、置換若しくは未置換のアルコキシ基、置換若しくは未置換のアリール基、又は、置換若しくは未置換のアミノ基を表す。X1〜X20は、互いに結合して飽和若しくは不飽和の5員環又は6員環を形成してもよい。]で示されるジベンゾ{[f,f’]−4,4’,7,7’−テトラフェニル}ジインデノ[1,2,3−cd:1’,2’,3’−lm]ペリレン誘導体とを混合させた少なくとも1層の発光層を有し、
前記電子注入層又は電子輸送層が、下記一般式[3’
Figure 0003688207
[一般式[3’]中のMは金属原子を表す。R1〜R6は、それぞれ独立に水素原子、ハロゲン原子、置換若しくは未置換のアルキル基、置換若しくは未置換のアルコキシ基、置換若しくは未置換のアリール基、置換若しくは未置換のアリールオキシ基、置換若しくは未置換のシクロアルキル基又はシアノ基を表す。Lは、ハロゲン原子、置換若しくは未置換のアルコキシ基、置換若しくは未置換のアリールオキシ基、置換若しくは未置換のアルキル基、置換若しくは未置換のアリールオキシ基又は置換若しくは未置換のシクロアルキル基を有する配位子を表す。]で示される(ただし、式[3]で示される化合物を除く)有機金属錯体を更に含む請求項5に記載の有機金属錯体を含む有機EL素子。
The following general formula [6]
Figure 0003688207
[R1 to R28 in General Formula [6] are each independently a hydrogen atom, a halogen atom, a substituted or unsubstituted alkyl group, a substituted or unsubstituted alkoxy group, a substituted or unsubstituted aryl group, Represents an unsubstituted amino group. R1 to R4 and R5 to R8 may be bonded to each other to form a saturated or unsaturated 5-membered ring or 6-membered ring. And an aromatic amine derivative represented by the following general formula [2]
Figure 0003688207
[X1 to X20 in the general formula [2] are each independently a hydrogen atom, a halogen atom, a substituted or unsubstituted alkyl group, a substituted or unsubstituted alkoxy group, a substituted or unsubstituted aryl group, or a substituted or Represents an unsubstituted amino group. X1 to X20 may be bonded to each other to form a saturated or unsaturated 5-membered ring or 6-membered ring. And a dibenzo {[f, f ′]-4,4 ′, 7,7′-tetraphenyl} diindeno [1,2,3-cd: 1 ′, 2 ′, 3′-lm] perylene derivative represented by Having at least one light emitting layer mixed with
The electron injection layer or the electron transport layer is represented by the following general formula [ 3 ′ ].
Figure 0003688207
[M in the general formula [ 3 ′ ] represents a metal atom. R1 to R6 each independently represents a hydrogen atom, a halogen atom, a substituted or unsubstituted alkyl group, a substituted or unsubstituted alkoxy group, a substituted or unsubstituted aryl group, a substituted or unsubstituted aryloxy group, substituted or unsubstituted Represents a substituted cycloalkyl group or cyano group. L has a halogen atom, a substituted or unsubstituted alkoxy group, a substituted or unsubstituted aryloxy group, a substituted or unsubstituted alkyl group, a substituted or unsubstituted aryloxy group, or a substituted or unsubstituted cycloalkyl group Represents a ligand. The organic EL element containing the organometallic complex according to claim 5, further comprising an organometallic complex represented by formula (except for the compound represented by the formula [3]) .
一般式[2]のジベンゾ{[f,f’]−4,4’,7,7’−テトラフェニル}ジインデノ[1,2,3−cd:1’,2’,3’−lm]ペリレン誘導体が下記式[2a]で示される化合物であることを特徴とする請求項1、2,5,及び6のいずれか1項に記載の有機EL素子。
Figure 0003688207
Dibenzo {[f, f ′]-4,4 ′, 7,7′-tetraphenyl} diindeno [1,2,3-cd: 1 ′, 2 ′, 3′-lm] perylene of the general formula [2] The organic EL device according to any one of claims 1, 2, 5, and 6, wherein the derivative is a compound represented by the following formula [2a].
Figure 0003688207
一般式[2]のジベンゾ{[f,f’]−4,4’,7,7’−テトラフェニル}ジインデノ[1,2,3−cd:1’,2’,3’−lm]ペリレン誘導体が下記式[2b]で示される化合物であることを特徴とする請求項1、2,5,及び6のいずれか1項に記載の有機EL素子。
Figure 0003688207
Dibenzo {[f, f ′]-4,4 ′, 7,7′-tetraphenyl} diindeno [1,2,3-cd: 1 ′, 2 ′, 3′-lm] perylene of the general formula [2] The organic EL device according to any one of claims 1, 2, 5, and 6, wherein the derivative is a compound represented by the following formula [2b].
Figure 0003688207
一般式[1]、[4]、[5]又は[6]の芳香族アミン誘導体をホストとし、これに一般式[2]のジベンゾ{[f,f’]−4,4’,7,7’−テトラフェニル}ジインデノ[1,2,3−cd:1’,2’,3’−lm]ペリレン誘導体がドープされており、ドープ比率が1〜10%であることを特徴とする請求項1、2,5,及び6のいずれか1項に記載の有機EL素子。  The aromatic amine derivative of the general formula [1], [4], [5] or [6] is used as a host, and the dibenzo {[f, f ′]-4,4 ′, 7, 7'-tetraphenyl} diindeno [1,2,3-cd: 1 ', 2', 3'-lm] perylene derivative is doped, and the doping ratio is 1 to 10%. Item 7. The organic EL device according to any one of Items 1, 2, 5, and 6. 一般式[3]の有機金属錯体が下記式[3a]で示される化合物であることを特徴とする請求項1又は5に記載の有機EL素子。
Figure 0003688207
6. The organic EL device according to claim 1, wherein the organometallic complex of the general formula [3] is a compound represented by the following formula [3a].
Figure 0003688207
一般式[3]の有機金属錯体が下記式[3b]で示される化合物であることを特徴とする請求項1又は5に記載の有機EL素子。
Figure 0003688207
6. The organic EL device according to claim 1, wherein the organometallic complex represented by the general formula [3] is a compound represented by the following formula [3b].
Figure 0003688207
電子注入層又は電子輸送層が、一般式[3]で示される有機金属錯体を複数種含むことを特徴とする請求項1、5、10、及び11のいずれか1項に記載の有機EL素子。  The organic EL element according to any one of claims 1, 5, 10, and 11, wherein the electron injection layer or the electron transport layer contains a plurality of types of organometallic complexes represented by the general formula [3]. . 電子注入層又は電子輸送層が、下記式[3a]で示される化合物及び下記式[3b]で示される化合物を含むことを特徴とする請求項12に記載の有機EL素子。
Figure 0003688207
Figure 0003688207
The organic EL device according to claim 12, wherein the electron injection layer or the electron transport layer contains a compound represented by the following formula [3a] and a compound represented by the following formula [3b].
Figure 0003688207
Figure 0003688207
電子注入層又は電子輸送層が、下記一般式[a](Q)3−Al … [a][一般式[a]中のQは、置換若しくは未置換の8−キノリノラート配位子を表す。]で示される発光性有機アルミニウム錯体を含むことを特徴とする請求項1、2、5、6、10、及び11のいずれか1項に記載の有機EL素子。  The electron injection layer or the electron transport layer is represented by the following general formula [a] (Q) 3 -Al [a] [Q in the general formula [a] represents a substituted or unsubstituted 8-quinolinolato ligand. The organic EL element according to any one of claims 1, 2, 5, 6, 10, and 11, which comprises a light-emitting organoaluminum complex represented by the formula: 請求項1〜14のいずれか1項に記載の有機EL素子を搭載したことを特徴とする有機ELディスプレイ。  An organic EL display comprising the organic EL element according to claim 1.
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