High efficiency deep blue phosphorescent organic light-emitting diodes using a double emissive layer structure

被引：6
作者：
Lee, Jonghee [1 ]
Lee, Jeong-Ik [1 ]
Lee, Jun Yeob [2 ]
Chu, Hye Yong [1 ]
机构：
[1] Elect & Telecommun Res Inst, Convergence Components & Mat Res Lab, Taejon 305350, South Korea
[2] Dankook Univ, Dept Polymer Sci & Engn, Yongin 448701, South Korea
来源：
SYNTHETIC METALS | 2009年 / 159卷 / 19-20期
关键词：
Organic light-emitting diodes (OLEDs); Deep blue phosphorescent; Double emissive layer structures (D-EMLs); Quantum efficiency; DEVICES; ELECTROPHOSPHORESCENCE;
D O I：
10.1016/j.synthmet.2009.06.022
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
High efficiency deep blue phosphorescent organic light-emitting diodes (PHOLEDs) have been developed with a double emissive layer structure (D-EML). Using bis(4',6'-difluorophenylpyridinato)tetrakis(1-pyrazolyl)borate (FIr6) as an electro-phosphorescent dopant, we achieved a maximum external quantum efficiency of 14.8% in the deep blue PHOLEDs with D-EMLs, which is 50% higher value than that of 9.76% with single emissive layer structure (S-EML). Moreover, the external quantum efficiency at high current density region of 10mA/cm(2) was maintained up to 11.3% in this D-EML device. We attributed this enhancement to the expansion of carrier recombination region and the effective confinement of exciton within the emissive layer. Crown Copyright (C) 2009 Published by Elsevier B.V. All rights reserved.
引用
收藏
页码：1956 / 1959
页数：4
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