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

Dong Ryeol Whang, Youngmin You, Se Hun Kim, Won Ik Jeong, Young Seo Park, Jang Joo Kim, Soo Young Park

Research output: Contribution to journalArticlepeer-review

49 Citations (Scopus)

Abstract

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, C2′] 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 cdA, and a maximum power efficiency of 15.0 lmW at 0.01 mA cm2.

Original languageEnglish
Article number233501
JournalApplied Physics Letters
Volume91
Issue number23
DOIs
Publication statusPublished - 2007

Bibliographical note

Funding Information:
This work was partly supported by the Korea Science and Engineering Foundation (KOSEF) through the National Research Laboratory Program funded by the Ministry of Science and Technology (No. 2006-03246), and by Dongwoo FineChem Co.

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy (miscellaneous)

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