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Bright red-emitting electrophosphorescent device using osmium complex as a triplet emitter

被引：87
作者：
Kim, JH
Liu, MS
Jen, AKY
Carlson, B
Dalton, LR
Shu, CF
Dodda, R
机构：
[1] Univ Washington, Dept Mat Sci & Engn, Seattle, WA 98195 USA
[2] Univ Washington, Dept Chem, Seattle, WA 98195 USA
[3] Natl Chiao Tung Univ, Dept Appl Chem, Hsinchu 30035, Taiwan
来源：
APPLIED PHYSICS LETTERS | 2003年 / 83卷 / 04期
关键词：
D O I：
10.1063/1.1593230
中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
A series of efficient and bright double-layer light-emitting devices have been fabricated using the osmium (Os) complex as the triplet emissive dopant in both a blue-emitting polyfluorene derivative (PF-TPA-OXD) containing hole-transporting triphenylamine (TPA) and electron-transporting oxadiazole (OXD) as side chains and a blend of 2-(4-t-butylphenyl)-5(4-biphenylyl)-1,3,4-oxadizole (PBD) in poly(N-vinylcarbazole) (PVK). Due to a balanced charge injection and transport in PF-TPA-OXD and very efficient energy transfer from this polymer to the Os complex, the resulting device (indium tin oxide/HTL/OsCF3:PF-TPA-OXD/Ca/Ag) reaches a maximum external quantum efficiency of 2.1% with a peak brightness of 2920 cd/m(2). These results are significantly higher than those obtained from the commonly used host, PVK:PBD (0.49% and 1270 cd/m(2)). (C) 2003 American Institute of Physics.
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页码：776 / 778
页数：3
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