Single-step triplet-triplet annihilation: An intrinsic limit for the high brightness efficiency of phosphorescent organic light emitting diodes

被引：134

作者：

Staroske, W. ^{[1
]}

Pfeiffer, M. ^{[1
]}

Leo, K. ^{[1
]}

Hoffmann, M. ^{[1
]}

机构：

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

来源：

PHYSICAL REVIEW LETTERS | 2007年 / 98卷 / 19期

关键词：

D O I：

10.1103/PhysRevLett.98.197402

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We investigate triplet-triplet annihilation in molecular host-guest systems where triplets are localized on spatially separated guest molecules. Our results indicate that the dominant mechanism of annihilation is single-step long-range (Forster-type) energy transfer between two excited guests. This mechanism leads to a fundamental limit for the efficiency of phosphorescent organic light emitting diodes at high luminance. Our model is confirmed by photoluminescence decay experiments on 2,3,7,8,12,13,17,18-octaethylporphine platinum as guest in a host matrix of 4,4(')-N,N-'-dicarbazole-biphenyl.

引用

页数：4

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