Bipolar Gold(III) Complexes for Solution-Processable Organic Light-Emitting Devices with a Small Efficiency Roll-Off

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...

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Published inJournal of the American Chemical Society Vol. 136; no. 51; pp. 17861 - 17868
Main Authors Tang, Man-Chung, Tsang, Daniel Ping-Kuen, Wong, Yi-Chun, Chan, Mei-Yee, Wong, Keith Man-Chung, Yam, Vivian Wing-Wah
Format Journal Article
LanguageEnglish
Published WASHINGTON American Chemical Society 24.12.2014
Amer Chemical Soc
Subjects
Chemistry
Chemistry, Multidisciplinary
Physical Sciences
Science & Technology
CYCLOMETALATED ALKYNYLGOLD(III) COMPLEXES
EXTERNAL QUANTUM EFFICIENCY
PHOTOPHYSICS
CRYSTAL-STRUCTURES
REDOX PROPERTIES
DIODES
NONDOPED ELECTROPHOSPHORESCENT DEVICES
ELECTROLUMINESCENCE
GREEN IRIDIUM DENDRIMERS
C-N-C
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Summary: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%.
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ISSN:0002-7863
1520-5126
DOI:10.1021/ja510622x