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

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 maintainin...

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Published in:Applied physics letters 2007-12, Vol.91 (23), p.233501-233501-3
Main Authors: Whang, Dong Ryeol, You, Youngmin, Kim, Se Hun, Jeong, Won-Ik, Park, Young-Seo, Kim, Jang-Joo, Park, Soo Young
Format: Article
Language:English
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Summary: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 .
ISSN:0003-6951
1077-3118
DOI:10.1063/1.2821116