Top-emitting OLED using praseodymium oxide coated platinum as hole injectors

被引：37

作者：

Qiu, CF ^{[1
]}

Peng, HJ ^{[1
]}

Chen, HY ^{[1
]}

Xie, ZL ^{[1
]}

Wong, M ^{[1
]}

Kwok, HS ^{[1
]}

机构：

[1] Hong Kong Univ Sci & Technol, Ctr Display Res, Dept Elect & Elect Engn, Kowloon, Hong Kong, Peoples R China

来源：

IEEE TRANSACTIONS ON ELECTRON DEVICES | 2004年 / 51卷 / 07期

关键词：

microcavity effects; platinum; praseodymium oxide; top-emitting organic light-emitting diodes;

D O I：

10.1109/TED.2004.829897

中图分类号：

TM [电工技术]; TN [电子技术、通信技术];

学科分类号：

0808 ; 0809 ;

摘要：

Praseodymium oxide (Pr2O3) coated platinum (Pt) was investigated as a composite hole-injection layer for "top-emitting" organic light-emitting diodes (OLEDs) based on copper (II) phthalo-cyanine-N, N'-diphenyl-N, N' bis(3-methylphenyl-1, 1'-biphenyl-4, 4'-diamine-tris-8-hydroxyquinoline aluminum. Aluminum was used as the current-carrying and reflecting anode electrode underneath the composite hole-injection layer. The resulting radiation pattern was found to be highly non-Lambertian. With 1-nm Pr2O3 on 2-nm Pt, a luminance of similar to1400 cd/m(2) in the normal direction was obtained. When the intensity was integrated over all angles, it was determined that these OLEDs emitted 30% more radiation than their conventional "bottom-emitting" counterparts. An external quantum efficiency of 1.32% and a power 2 efficiency of 1.1 lm/W were obtained at 100 cd/m(2). The difference between top- and bottom-emitting diodes is explained in terms of microcavity effects.

引用

页码：1207 / 1210

页数：4

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