Ideal host and guest system in phosphorescent OLEDs

被引：178

作者：

Jeon, Woo Sik ^{[2
]}

Park, Tae Jin ^{[2
]}

Kim, Sun Young ^{[2
]}

Pode, Ramchandra ^{[1
]}

Jang, Jin ^{[2
]}

Kwon, Jang Hyuk ^{[2
]}

机构：

[1] Kyung Hee Univ, Dept Phys, Seoul 130701, South Korea

[2] Kyung Hee Univ, Dept Informat Display, Seoul 130701, South Korea

来源：

ORGANIC ELECTRONICS | 2009年 / 10卷 / 02期

关键词：

Host; Dopant; Phosphorescent; OLED; Energy transfer; Guest; FORSTER ENERGY-TRANSFER; HIGHLY EFFICIENT; IRIDIUM COMPLEX; ELECTROPHOSPHORESCENCE; DEVICES; MOLECULES; EMISSION;

D O I：

10.1016/j.orgel.2008.11.012

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Ideal host-guest system for emission in phosphorescent OLEDs with only 1% guest doping condition for efficient energy transfer have been demonstrated in the present investigation. Using a narrow band-gap fluorescent host material, bis(10-hydroxybenzo[h]quinolinato)beryllium complex (Bebq(2)), and red dopant bis(2-phenylquinoline)(acetylacetonate)iridium (Ir(phq)(2)acac), highly efficient red phosphorescent OLEDs (PHOLEDs) exhibiting excellent energy transfer characteristics with a doping concentration of 1% were developed. Fabricated PHOLEDs show a driving voltage of 3.7 V, maximum current and power efficiencies of 26.53 cd/A and 29.58 Im/W, and a maximum external quantum efficiency of 21%. Minimized electron or hole trapping at the phosphorescent guest molecules and efficient Forster and Dexter energy transfers from the Bebq(2) host singlet and triplet states to the emitting triplet of Ir(phq)(2)acac guest appear to be the key mechanism for ideal phosphorescence emission. Crown Copyright (C) 2008 Published by Elsevier B.V. All rights reserved.

引用

页码：240 / 246

页数：7

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