期刊
ORGANIC ELECTRONICS
卷 26, 期 -, 页码 25-29出版社
ELSEVIER
DOI: 10.1016/j.orgel.2015.07.018
关键词
Host materials; HOMO/LUMO levels; Triplet energy; Phosphorescent OLEDs; Bicarbazole
资金
- Natural Science Foundation of China [21202114, 61177016]
- Ph.D. Programs Foundation of Ministry of Education of China [2013201130004]
- PAPD
- Collaborative Innovation Center of Suzhou Nano Science and Technology, Soochow University
- Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD)
- Fund for Excellent Creative Research Teams of Jiangsu Higher Education Institution
New host materials (BCz-DBT and BCz-DBF) are synthesized by regrouped 3,3-bicarbazole (BCz) and dibenzothiophene (DBT)/dibenzofuran (DBF). Their thermal, electrochemical, electronic absorption and photoluminescent properties are also carefully investigated. The materials exhibit high glass transition temperatures (T-g) of 134 degrees C and 139 degrees C, respectively. This kind of molecular design can effectively achieve high triplet energies and suitable highest occupied molecular orbital and lowest unoccupied molecular orbital (HOMO/LUMO) energy levels. High external quantum efficiencies (EQE) of sky blue (EQE = 25%) and three-color white (EQE = 21.4%) phosphorescent OLEDs have been achieved by using BCz-DBF as the host material. (C) 2015 Elsevier B.V. All rights reserved.
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