Journal
ORGANIC ELECTRONICS
Volume 48, Issue -, Pages 112-117Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.orgel.2017.05.034
Keywords
Bipolar host; Reduced efficiency roll-off; Phosphorescent OLED
Funding
- National Key R& D Program of China [2016YFB0400703]
- National Natural Science Foundation of China [61475106]
- Natural Science Foundation of Jiangsu Province [BK20151264]
- Collaborative Innovation Center of Suzhou Nano Science & Technology (NANOCIC)
- Priority Academic Program Development of Jiangsu Higher Education Institutions
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A novel aminoborane-based host material, 9-(dimesitylboryl)-9 '-phenyl-9H, 9 ' H-3,3 '-bicarbazole (BCzBMes) was developed for blue and white phosphorescent OLEDs (PHOLEDs). The thermal, photophysical and electrochemical properties were systematically investigated. BCzBMes not only has a high triplet energy but also shows a bipolar behavior. To validate the superior properties of BCzBMes, blue and white PHOLEDs were fabricated using BCzBMes as a bipolar host material. A blue PHOLED containing Bis(4,6-difluorophenylpyridinato-N, C2) picolinatoiridium (FIrPic) as a dopant exhibited excellent performance with a maximum external quantum efficiency (EQE) of 16.7%. In particular, the blue PHOLED exhibited an extraordinary low efficiency roll-off of 10.1% at a brightness of 5000 cd/ m(2). Meanwhile, an all-phosphor near-white device hosted by BCzBMes was also fabricated, and a high EQE of 18.8% was achieved. This excellent performance suggests that BCzBMes is a potential bipolar host material for the PHOLEDs. (C) 2017 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license
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