Deep Blue Exciplex Organic Light-Emitting Diodes with Enhanced Efficiency; P-type or E-type Triplet Conversion to Singlet Excitons?

被引：307

作者：

Jankus, Vygintas ^{[1
]}

Chiang, Chien-Jung ^{[1
]}

Dias, Fernando ^{[1
]}

Monkman, Andrew P. ^{[1
]}

机构：

[1] Univ Durham, Dept Phys, Durham DH1 3LE, England

来源：

ADVANCED MATERIALS | 2013年 / 25卷 / 10期

基金：

英国工程与自然科学研究理事会;

关键词：

AMPLIFIED SPONTANEOUS EMISSION; DELAYED FLUORESCENCE; MONTE-CARLO; FILMS; ELECTROLUMINESCENCE; RELAXATION; DEVICES; STATES; PURE;

D O I：

10.1002/adma.201203615

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

Simple trilayer, deep blue, fluorescent exciplex organic light-emitting diodes (OLEDs) are reported. These OLEDs emit from an exciplex state formed between the highest occupied molecular orbital (HOMO) of N,N′-bis(1- naphthyl)N,N′-diphenyl-1,1′-biphenyl-4,4′-diamine (NPB) and lowest unoccupied molecular orbital (LUMO) of 1,3,5-tri(1-phenyl-1H-benzo[d] imidazol-2-yl)phenyl (TPBi) and the NPB singlet manifold, yielding 2.7% external quantum efficiency at 450 nm. It is shown that the majority of the delayed emission in electroluminescence arises from P-type triplet fusion at NPB sites not E-type reverse intersystem crossing because of the presence of the NPB triplet state acting as a deep trap. Copyright © 2013 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

引用

页码：1455 / 1459

页数：5

共 40 条

[1] Nearly 100% internal phosphorescence efficiency in an organic light-emitting device [J].