Aminoborane-based bipolar host material for blue and white-emitting electrophosphorescence devices

作者：Sun, Qi; Cui, Lin-Song; Xie, Yue-Min; Liang, Jiao-Jiao; Jiang, Zuo-Quan; Liao, Liang-Sheng^*; Fung, Man-Keung^*

来源：Organic Electronics, 2017, 48: 112-117.

DOI：10.1016/j.orgel.2017.05.034

• Bipolar host
• Reduced efficiency roll-off
• Phosphorescent OLED

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.

• 出版日期2017-9
• 单位苏州大学