Blue Phosphorescent Organic Light-Emitting Diodes Using an Exciplex Forming Co-host with the External Quantum Efficiency of Theoretical Limit

被引：254
|
作者：
Shin, Hyun [1 ]
Lee, Sunghun [2 ]
Kim, Kwon-Hyeon [2 ]
Moon, Chang-Ki [1 ]
Yoo, Seung-Jun [2 ]
Lee, Jeong-Hwan [2 ]
Kim, Jang-Joo [1 ,2 ]
机构：
[1] Seoul Natl Univ, Dept Mat Sci & Engn, Seoul 151742, South Korea
[2] Seoul Natl Univ, Dept Mat Sci & Engn, WCU Hybrid Mat Program, Seoul 151742, South Korea
来源：
ADVANCED MATERIALS | 2014年 / 26卷 / 27期
关键词：
BIPOLAR HOST MATERIALS; HIGH-TRIPLET-ENERGY; PHOSPHINE OXIDE; DEVICES; GREEN; ORIENTATION; CARBAZOLE; MOLECULES; LAYER; FILMS;
D O I：
10.1002/adma.201400955
中图分类号：
O6 [化学];
学科分类号：
0703 ;
摘要：
A high-efficiency blue-emitting organic light-emitting diode (OLED) approaching theoretical efficiency using an exciplex-forming co-host composed of N,N'-dicarbazolyl-3,5-benzene (mCP) and bis-4,6-(3,5-di-3-pyridylphenyl)-2-methylpyrimidine (B3PYMPM) is fabricated. Iridium(III) bis[(4,6-difluorophenyl)-pyridinato-N, C2']picolinate (FIrpic) is used as the emitter, which turns out to have a preferred horizontal dipole orientation in the emitting layer. The OLED shows a maximum external quantum efficiency of 29.5% (a maximum current efficiency of 62.2 cd A(-1)), which is in perfect agreement with the theoretical prediction.
引用
收藏
页码：4730 / +
页数：6
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