Saripally Sudhaker Reddy, Woosum Cho, V. Sree
Nov 1, 2016
Citations
1
Influential Citations
37
Citations
Journal
Dyes and Pigments
Abstract
Abstract 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 (CE max ) of 4.6 cd A ─1 and a maximum external quantum efficiency (EQE max ) 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 CE max of 62.7 cd A ─1 and a EQE max 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.