High-efficiency electrophosphorescent organic light-emitting diodes with double light-emitting layers

被引：156

作者：

Zhou, X ^{[1
]}

Qin, DS

Pfeiffer, M

Blochwitz-Nimoth, J

Werner, A

Drechsel, J

Maennig, B

Leo, K

Bold, M

Erk, P

Hartmann, H

机构：

[1] Tech Univ Dresden, Inst Angew Photophys, D-01062 Dresden, Germany

[2] BASF AG, Performance Chem Res, D-67056 Ludwigshafen, Germany

[3] FH Merseburg, FB CHem & Umweltingenieurwesen, D-06217 Merseburg, Germany

来源：

APPLIED PHYSICS LETTERS | 2002年 / 81卷 / 21期

关键词：

D O I：

10.1063/1.1522495

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

We demonstrate high-efficiency electrophosphorescent organic light-emitting diodes (PHOLEDs) with double light-emitting layers (D-EMLs) by doping both hole and electron transport hosts with fac tris(2-phenylpyridine)iridium [Ir(ppy)(3)] simultaneously. The D-EMLs PHOLEDs show significantly improved efficiency (peak external quantum efficiency of about 12.6%, corresponding to a current efficiency of 44.3 cd/A) compared to the conventional PHOLEDs with a single EML and either hole or electron transport host doped with Ir(ppy)(3). We attribute this improvement mainly to reduced losses of triplet excitons into regions that are not doped by phosphorescent emitter molecules. (C) 2002 American Institute of Physics.

引用

页码：4070 / 4072

页数：3