From Mononuclear to Dinuclear Iridium(III) Complex: Effective Tuning of the Optoelectronic Characteristics for Organic Light-Emitting Diodes

Inorganic Chemistry
Xiaolong YangWai-Yeung Wong

Abstract

Phosphorescent dinuclear iridium(III) complexes that can show high luminescent efficiencies and good electroluminescent abilities are very rare. In this paper, highly phosphorescent 2-phenylpyrimidine-based dinuclear iridium(III) complexes have been synthesized and fully characterized. Significant differences of the photophysical and electrochemical properties between the mono- and dinuclear complexes are observed. The theoretical calculation results show that the dinuclear complexes adopt a unique molecular orbital spatial distribution pattern, which plays the key role of determining their photophysical and electrochemical properties. More importantly, the solution-processed organic light-emitting diode (OLED) based on the new dinuclear iridium(III) complex achieves a peak external quantum efficiency (ηext) of 14.4%, which is the highest ηext for OLEDs using dinuclear iridium(III) complexes as emitters. Besides, the efficiencies of the OLED based on the dinuclear iridium(III) complex are much higher that those of the OLED based on the corresponding mononuclear iridium(III) complex.

References

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Citations

Sep 21, 2016·ACS Applied Materials & Interfaces·Pachaiyappan RajamalliChien-Hong Cheng
Mar 28, 2017·Chemistry : a European Journal·Victoria E PritchardMichaele J Hardie
Nov 10, 2018·Dalton Transactions : an International Journal of Inorganic Chemistry·Daniel G CongraveMartin R Bryce
Jan 15, 2019·Chemical Record : an Official Publication of the Chemical Society of Japan ... [et Al.]·Zhao FengGuijiang Zhou
Apr 16, 2019·Dalton Transactions : an International Journal of Inorganic Chemistry·Lin ZhangYou-Xuan Zheng
May 9, 2019·Dalton Transactions : an International Journal of Inorganic Chemistry·Ning Su, You-Xuan Zheng
Jan 23, 2018·Dalton Transactions : an International Journal of Inorganic Chemistry·Daniel G CongraveMartin R Bryce
Jan 17, 2020·Chemical Society Reviews·Guangfu LiMartin R Bryce

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