Diarylmethylene-bridged 4,4′-(bis(9-carbazolyl))biphenyl: Morphological stable host material for highly efficient electrophosphorescence

Zuoquan Jiang, Xichen Xu, Zhiqiang Zhang, Chuluo Yang, Zhongyin Liu, Youtian Tao, Jingui Qin, Dongge Ma

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22 Scopus citations

Abstract

A novel compound (BCBP) based on the modification of a well-known host material 4,4′-(bis(9-carbazolyl))biphenyl (CBP) through arylmethylene bridge linkage was synthesized, and fully characterized. Its thermal, electrochemical, electronic absorption and photoluminescent properties were studied. A high glass transition temperature (Tg) of 173 °C is observed for BCBP due to the introduction of the bridged structure, remarkably contrasting with a low Tg of 62 °C for CBP. Furthermore, the bridged structure enhances the conjugation and raises the HOMO energy, thus facilitating hole-injection and leading to a low turn-on voltage in an electroluminescent device. With the device structure of ITO/MoO 3/NPB/Ir complex: BCBP/BCP/Alq3/LiF/Al, maximum power efficiencies of 41.3 lm/W and 6.3 lm/W for green- and blue-emitting OLED were achieved, respectively.

Original languageEnglish
Pages (from-to)7661-7665
Number of pages5
JournalJournal of Materials Chemistry
Volume19
Issue number41
DOIs
StatePublished - 2009
Externally publishedYes

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