1,3,4-Oxadiazole Containing Silanes as Novel Hosts for Blue Phosphorescent Organic Light Emitting Diodes
datasetposted on 20.02.2016, 09:48 by Man-kit Leung, Wan-Hsi Yang, Ching-Nan Chuang, Jiun-Haw Lee, Chi-Feng Lin, Mao-Kuo Wei, Yu-Hao Liu
Five rigid oxadiazole (OXD) containing silanes, denoted 1–5, have been developed with high morphological stability. Disruption of the π-aromatic conjugation by introduction of Si atoms leads to a large band gap and high triplet energy. Among the OXDs we studied, 2,5-bis(triphenylsilylphenyl)-1,3,4-oxadiazole 5 is the best host for FIrpic, with a phosphorescent organic light emitting diode (PHOLED) turn-on voltage of 6.9 V, maximum luminance of 5124 cd/m2, current efficiency of 39.9 cd/A, and external quantum efficiency of 13.1%. Special molecular stacking in the single crystal of 5 was discussed.