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- Title
Simple Bipolar Hosts with High Glass Transition Temperatures Based on 1,8-Disubstituted Carbazole for Efficient Blue and Green Electrophosphorescent Devices with 'Ideal' Turn-on Voltage.
- Authors
Huang, Hong; Wang, Yixin; Pan, Biao; Yang, Xiao; Wang, Lei; Chen, Jiangshan; Ma, Dongge; Yang, Chuluo
- Abstract
Two hybrids based on 1,8-disubstituted carbazole, 1,8-OXDCz and 1,8-mBICz, have been designed and synthesized through a facile process. The incorporation of oxadiazole or N-phenylbenzimidazole moieties at the 1,8-positions of carbazole greatly improves its morphological stability, giving glass transition temperatures ( Tg) as high as 138 and 154 °C, respectively. Blue phosphorescent organic light-emitting devices (PhOLEDs) with 1,8-mBICz exhibit almost the same performance as a similarly structured device based on the mCP host, and green PhOLEDs employing the new host material 1,8-OXDCz exhibit an ideal turn-on voltage (2.5 V at 1.58 cd m−2), a maximum current efficiency ( ηc,max) of 73.9 cd A−1, and a power efficiency ( ηp,max) of 89.7 lm W−1. These results are among the best performances of [Ir(ppy)3]-based devices with simple device configurations.
- Publication
Chemistry - A European Journal, 2013, Vol 19, Issue 5, p1828
- ISSN
0947-6539
- Publication type
Article
- DOI
10.1002/chem.201202329