title: Bipolar gold(III) complexes for solution-processable organic light-emitting devices with a small efficiency roll-off.
abstract: A new class of bipolar alkynylgold(III) complexes containing triphenylamine and benzimidazole moieties has been synthesized, characterized, and applied as phosphorescent dopants in the fabrication of solution-processable organic light-emitting devices (OLEDs). The incorporation of methyl groups in the central phenyl unit has been found to rigidify the molecule to reduce nonradiative decay, yielding a high photoluminescence quantum yield of up to 75% in spin-coated thin films. In addition, the realization of highly efficient solution-processable OLEDs with an extremely small external quantum efficiency (EQE) roll-off has been demonstrated. At practical brightness level of 1000 cd m(-2), the optimized devices exhibited a high EQE of up to 10.0% and an extremely small roll-off of less than 1%.
authors.affiliation: Department of Chemistry, The University of Hong Kong , Pokfulam Road, Pokfulam, Hong Kong.
authors.forename: Man-Chung
authors.initials: MC
authors.lastname: Tang
authors.forename: Daniel Ping-Kuen
authors.initials: DP
authors.lastname: Tsang
authors.forename: Yi-Chun
authors.initials: YC
authors.lastname: Wong
authors.forename: Mei-Yee
authors.initials: MY
authors.lastname: Chan
authors.forename: Keith Man-Chung
authors.initials: KM
authors.lastname: Wong
authors.forename: Vivian Wing-Wah
authors.initials: VW
authors.lastname: Yam