A highly efficient wide-band-gap host material for blue electrophosphorescent light-emitting devices

被引：48

作者：

Whang, Dong Ryeol

You, Youngmin

Kim, Se Hun

Jeong, Won-Ik

Park, Young-Seo

Kim, Jang-Joo

Park, Soo Young

机构：

[1] Seoul Natl Univ, Dept Mat Sci & Engn, Seoul 151744, South Korea

[2] Dongwoo FineChem Co Ltd, Pyungtaek R&D Ctr, Kyonggi Do 451764, South Korea

来源：

APPLIED PHYSICS LETTERS | 2007年 / 91卷 / 23期

关键词：

D O I：

10.1063/1.2821116

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

We report on an efficient wide-band-gap host material for blue electrophosphorescence devices, namely, 1,2-trans-di-9-carbazolylcyclobutane (DCz). Photophysical studies show that lower-energy excimer formation between the carbazole units can be efficiently suppressed in a DCz film, thus maintaining its high triplet-state energy and inducing an exothermic energy transfer from DCz to iridium(III)bis[(4,6-difluorophenyl)-pyridinato-N,C-2']picolinate (FIrpic). Electrophosphorescent devices comprising a FIrpic:DCz emitting layer exhibit a superior performance with a maximum external quantum efficiency of 9.8%, a maximum luminance efficiency of 21.5 cd/A, and a maximum power efficiency of 15.0 lm/W at 0.01 mA/cm(2). (c) 2007 American Institute of Physics.

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