Interlayer Engineering with Different Host Material Properties in Blue Phosphorescent Organic Light-Emitting Diodes

被引：27

作者：

Lee, Jonghee ^{[1
]}

Lee, Jeong-Ik ^{[1
]}

Lee, Joo-Won ^{[1
]}

Chu, Hye Yong ^{[1
]}

机构：

[1] ETRI, Convergence Components & Mat Res Lab, Taejon, South Korea

来源：

ETRI JOURNAL | 2011年 / 33卷 / 01期

关键词：

Organic light-emitting diodes (OLED); blue; phosphorescent; interlayer; EFFICIENT; DEVICES; ELECTROPHOSPHORESCENCE; CARRIER; OLEDS;

D O I：

10.4218/etrij.11.0110.0172

中图分类号：

TM [电工技术]; TN [电子技术、通信技术];

学科分类号：

0808 ; 0809 ;

摘要：

We investigated the light-emitting performances of blue phosphorescent organic light-emitting diodes, known as PHOLEDs, by incorporating an N,N'-dicarbazolyl-3,5-benzen interlayer between the hole transporting layer and emitting layer (EML). We found that the effects of the introduced interlayer for triplet exciton confinement and hole/electron balance in the EML were exceptionally dependent on the host materials: 9-(4-tert-butylphenyl)3,6-bis(triphenylsilyl)-9H-carbazole, 9-(4-tert-butylphenyl)3,6-ditrityl-9H-carbazole, and 4,4'-bis-triphenylsilanyl-biphenyl. When an appropriate interlayer and host material were combined, the peak external quantum efficiency was greatly enhanced by over 21 times from 0.79% to 17.1%. Studies on the recombination zone using a series of host materials were also conducted.

引用

页码：32 / 38

页数：7

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