1,3,4-Oxadiazole Containing Silanes as Novel Hosts for Blue Phosphorescent Organic Light Emitting Diodes
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- 作者：Man-kit Leung ; Wan-Hsi Yang ; Ching-Nan Chuang ; Jiun-Haw Lee ; Chi-Feng Lin ; Mao-Kuo Wei ; Yu-Hao Liu
- 刊名：Organic Letters
- 出版年：2012
- 出版时间：October 5, 2012
- 年：2012
- 卷：14
- 期：19
- 页码：4986-4989
- 全文大小：300K
- 年卷期：v.14,no.19(October 5, 2012)
- ISSN：1523-7052
文摘
Five rigid oxadiazole (OXD) containing silanes, denoted 1鈥?b>5, have been developed with high morphological stability. Disruption of the 蟺-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.