Date：2017-11-06 |
Views：1802 |
【Academic writing Sharing 20171103】 |
Novel bipolar D-π-A type phenanthroimidazole/carbazole hybrid material for high efficiency nondoped deep-blue organic light-emitting diodes with NTSC CIEy and low efficiency roll-off
Article excerpt is from:Yu Tan, Zifeng Zhao, Liang Shang, Yang Liu, Chen Wei, Jiayi Li, Huibo Wei, Zhiwei Liu, Zuqiang Bian, and Chunhui Huang
J. Mater. Chem. C 2017, in press
two blue fluorescent D-A molecules composed of carbazole, phenanthroimidazole and cyano group, named as CBPMCN and CPBPMCN respectively. Single X-ray crystal data of CPBPMCN indicates that it adopts a severely twisted structure, resulting in a low degree of intermolecular π-π stacking, which is appropriate to be employed as a nondoped deep-blue emitter. Nondoped devices based on CPBPMCN exhibited deep-blue electroluminescence (EL) with CIE coordinates of (0.15, 0.08), which is extremely close to the NTSC standard blue. Meanwhile, the devices showed impressively high EQEmax up to 5.80% with relatively small efficiency roll-off.
