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Issue 41, 2014
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Improved host material for electrophosphorescence by positional engineering of spirobifluorene–carbazole hybrids

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Abstract

Two novel materials, SF2BCz and SF3BCz, which combine spirobifluorene (SF) and carbazole units by meta- and para-bonding, have been designed and synthesized by a straightforward process as hosts in phosphorescent organic light-emitting diodes (PhOLEDs), and their thermal and electronic absorption and photoluminescent properties investigated. The meta-linkage of SF enables SF3BCz to possess high triplet and energy levels and good thermal stability. Blue PhOLEDs featuring SF3BCz as a host give high performance and low roll-off, with an efficiency of 41.4 cd A−1 (39.8 lm W−1) at 100 cd m−2 and 39.7 cd A−1 (29.8 lm W−1) at 1000 cd m−2. In addition, SF3BCz has been adopted as a universal host for white PhOLEDs, with a maximum external quantum efficiency of 21.3% for two-color and 19.8% for three-color-based white devices. By adopting tandem technology, a four-color-based white PhOLED was also successfully constructed, achieving 40% external quantum efficiency and a stable color spectrum.

Graphical abstract: Improved host material for electrophosphorescence by positional engineering of spirobifluorene–carbazole hybrids

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Article information


Submitted
23 Jul 2014
Accepted
27 Aug 2014
First published
27 Aug 2014

J. Mater. Chem. C, 2014,2, 8736-8744
Article type
Paper

Improved host material for electrophosphorescence by positional engineering of spirobifluorene–carbazole hybrids

Y. Liu, L. Cui, X. Shi, Q. Li, Z. Jiang and L. Liao, J. Mater. Chem. C, 2014, 2, 8736
DOI: 10.1039/C4TC01619J

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