JP5456120B2 - 有機電界発光素子 - Google Patents
有機電界発光素子 Download PDFInfo
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- JP5456120B2 JP5456120B2 JP2012200558A JP2012200558A JP5456120B2 JP 5456120 B2 JP5456120 B2 JP 5456120B2 JP 2012200558 A JP2012200558 A JP 2012200558A JP 2012200558 A JP2012200558 A JP 2012200558A JP 5456120 B2 JP5456120 B2 JP 5456120B2
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- organic
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- type dopant
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Description
そこで、発明が解決しようとする課題は、n型ドーパント含有電子輸送層を用いた素子において、長期保存、高温保存で、輝度低下のない安定な延命化が図れる有機EL素子を提供することが一例として挙げられる。
前記陰極及び前記有機発光層間の前記有機半導体層に、電子供与性の金属原子又はそのイオンを含むn型ドーパントが含有され、
前記有機発光層は前記n型ドーパントの拡散を防止することを特徴とする。
基板1のガラスの透明材料の他としては、ポリスチレン等のプラスチック材料といった半透明材料の他に、シリコンやAl等の不透明な材料、フェノール樹脂等の熱硬化性樹脂、ポリカーボネート等の熱可塑性樹脂等を用いることができる。
ホール注入層3、ホール輸送層4、発光層5、n型ドーパントブロック層6並びにn型ドーパント含有電子輸送層7の主成分を構成する有機半導体層は、電荷輸送性(ホール及び/又は電子の移動性)を有する有機化合物を利用する。
n型ドーパント含有電子輸送層の主成分の電子輸送性を有する有機化合物(上記の電子輸送性有機化合物から選択される)へ混合される電子供与性材料であるn型ドーパントは、Li,Na,K,Rb,Csなどのアルカリ金属や、Be,Mg,Ca,Baなどのアルカリ土類金属や、Sc,Y,Yb,Eu,Sm,Ceなどの希土類金属や、これらのハロゲン塩(LiF,CsFなど)や、これらの酸化物塩(Cs2MoO4,Cs2WO4)や、これらの有機化合物(BLiq4,CsTPBなど)、それらの化合物であれば特に限定はない。特に、仕事関数が4.0eV以下の金属が好適に使用でき、具体例としてCs、Li、Na、K、Be、Mg、Ca、Sr、Ba、Y、La、Mg、Sm、Gd、Yb、又はそれらの化合物等が挙げられる。
発明者は、n型ドーパント含有電子輸送層から隣接層へのアルカリ金属化合物などのn型ドーパント(金属又はそのイオン)の拡散防止のためにn型ドーパントブロック層を提案する。n型ドーパントブロック層に重原子化合物を含ませることにより内部重原子効果を発揮させるのである。
第1成分の電子輸送性を有する有機化合物のNBphen=2,9-Bis(naphthalen-2-yl)-4,7-diphenyl-1,10-phenanthrolineに、電子供与性のアルカリ金属Csを含むn型ドーパントCs2MoO4が第2成分として混合されたn型ドーパント含有電子輸送層と、第3成分の電子輸送性を有する有機化合物TRZ=1,3,5-Triazine derivativesに、79以上の原子量を持つ少なくとも1種の重原子を含有する重原子化合物Ir(ppy)3=Tris(2-phenylpyridine)iridium(III) 「重原子(Ir:192)」が第4成分として混合されたn型ドーパントブロック層と、を含む複数の有機EL素子(実施例1)を作製し、その特性を測定し、アルカリ金属イオン(Cs)に対するn型ドーパントブロック層のブロック効果を評価した。
実施例3として、他のn型ドーパントを含むn型ドーパント含有電子輸送層を用いた素子を作成した。
他の実施例として、n型ドーパントブロック層を発光層と兼用、すなわち、一体化しn型ドーパントブロック発光層として膜厚を増加させた素子を作成した。
2 陽極
3 ホール注入層
4 ホール輸送層
5 発光層
6 n型ドーパントブロック層
7 n型ドーパント含有電子輸送層
7A 電子注入層
8 陰極
56 n型ドーパントブロック発光層
Claims (7)
- 有機発光層を含む有機半導体層を陽極及び陰極の間に有し、
前記有機発光層を含む有機半導体層のうちの前記陰極及び前記有機発光層の間に配置される陰極側有機半導体層が、電子供与性の化合物を有し、
前記有機発光層が重原子化合物を有し、
前記有機発光層における前記重原子化合物の体積含有量濃度は、前記陰極側有機半導体層における前記電子供与性の化合物の体積含有量濃度以上であることを特徴とする有機電界発光素子。 - 前記電子供与性の化合物はアルカリ金属、アルカリ土類金属又はそれらの化合物であることを特徴とする請求項1に記載の有機電界発光素子。
- 前記陰極側有機半導体層の前記陰極側に電子注入層が配置されていることを特徴とする請求項1又は2に記載の有機電界発光素子。
- 前記有機発光層の体積に対する前記重原子化合物の体積含有量濃度は、0.1vol%〜100vol%であることを特徴とする請求項1〜3のいずれか1に記載の有機電界発光素子。
- 前記陰極側有機半導体層の体積に対する前記電子供与性の化合物の体積含有量濃度は、0.1vol%〜100vol%であることを特徴とする請求項1〜4のいずれか1に記載の有機電界発光素子。
- 前記電子供与性の化合物は、Li,Na,K,Rb,Cs,Be,Mg,Ca,Ba,Sc,Y,Yb,Eu,Sm,Ceから選択されたものを有することを特徴とする請求項1〜5のいずれか1に記載の有機電界発光素子。
- 前記陽極及び陰極のどちらか片方の電極が半透明若しくは透明、又は前記陽極及び陰極が透明であることを特徴とする請求項1〜6のいずれか1に記載の有機電界発光素子。
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