Article ID Journal Published Year Pages File Type
175265 Dyes and Pigments 2016 10 Pages PDF
Abstract

•Four bipolar compounds are designed and synthesized.•Compounds based on acridine and imidazole derivatives.•Thermal, photophysical and electrochemical properties are studied.•Solution-processed nondoped deep-blue devices showed high efficiency of 5.1%.•As a host for solution-processed green devices displayed high efficiency of 18.9%.

A new class of bipolar compounds were designed and synthesized based on 9,9-dimethyl-9,10-dihydroacridine and phenylphenanthroimadazole/triphenylimadazole derivatives with different linking positions. Their thermal, photophysical, electrochemical properties and device characteristics were investigated. All four compounds were fabricated as emitters in solution-processed nondoped OLEDs. In particular, the N-phenylacridine 1,4-phenylene linked N-phenylphenanthrimidazole analogue displayed high efficiency with a maximum current efficiency (CEmax) of 4.6 cd A─1 and a maximum external quantum efficiency (EQEmax) of 5.1% at CIE coordinates of (0.15, 0.09), which is very close to the NTSC blue standard. In addition, when the N-phenylacridine 1,3-phenylene linked triphenylimidazole analogue was used as a host for green phosphor Ir(mppy)3, shows an impressive device performance with a CEmax of 62.7 cd A─1 and a EQEmax of 18.9%. To the best of our knowledge, both results are the best efficiencies as emitter and host for solution-processed nondoped deep-blue OLEDs and green PhOLEDs, respectively.

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Physical Sciences and Engineering Chemical Engineering Chemical Engineering (General)
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