Highly efficient phosphorescence from organic light-emitting devices with an exciton-block layer

被引：767

作者：

Ikai, M ^{[1
]}

Tokito, S

Sakamoto, Y

Suzuki, T

Taga, Y

机构：

[1] Toyota Cent Res & Dev Labs Inc, Aichi 4801192, Japan

[2] Inst Mol Sci, Okazaki, Aichi 4448585, Japan

来源：

APPLIED PHYSICS LETTERS | 2001年 / 79卷 / 02期

关键词：

D O I：

10.1063/1.1385182

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

One of the keys to highly efficient phosphorescent emission in organic light-emitting devices is to confine triplet excitons generated within the emitting layer. We employ "starburst" perfluorinated phenylenes (C60F42) as a both hole- and exciton-block layer, and a hole-transport material 4,4',4'-tri(N-carbazolyl) triphenylamine as a host for the phosphorescent dopant dye in the emitting layer. A maximum external quantum efficiency reaches to 19.2%, and keeps over 15% even at high current densities of 10-20 mA/cm(2), providing several times the brightness of fluorescent tubes for lighting. The onset voltage of the electroluminescence is as low as 2.4 V and the peak power efficiency is 70-72 lm/W, promising for low-power display devices. (C) 2001 American Institute of Physics.

引用

页码：156 / 158

页数：3

共 14 条

[1] High-efficiency organic electrophosphorescent devices with tris(2-phenylpyridine)iridium doped into electron-transporting materials [J].