Improvement of efficiency and color purity utilizing two-step energy transfer for red organic light-emitting devices

被引：66

作者：

Feng, J ^{[1
]}

Li, F ^{[1
]}

Gao, WB ^{[1
]}

Cheng, G ^{[1
]}

Xie, WF ^{[1
]}

Liu, SY ^{[1
]}

机构：

[1] Jilin Univ, Natl Lab Integrated Optoelect, Changchun 130023, Peoples R China

来源：

APPLIED PHYSICS LETTERS | 2002年 / 81卷 / 16期

关键词：

D O I：

10.1063/1.1515884

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

We present organic red light-emitting devices with improved optical and electrical characteristics utilizing the two-step energy transfer. N,N-'-diphenyl-N,N-'-bis(1-naphthyl)-(1,1(')-biphenyl)-4,4(')-diamine and tris-(8-hydroxyquinoline) aluminum (Alq) are used as hole and electron-transporting layers, respectively. Quinacridone (QAD) and 4-(dicyanomethylene)-2-t- butyl-6-(1,1,7,7-tetramethyljulolidyl-9-enyl)-4H-pyran (DCJTB) are codoped into the Alq emitting layer. Compared with devices where the emitting layer is only composed of Alq and DCJTB, the emitting characteristics such as emission efficiency and purity of emission color are greatly improved, and the turn-on voltage is decreased as much as 4 V. We attribute these improvements to the assistant dopant (QAD), which leads to the more efficient energy transfer from Alq to DCJTB. (C) 2002 American Institute of Physics.

引用

页码：2935 / 2937

页数：3

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