Carbene-stabilized enantiopure heterometallic clusters featuring EQE of 20.8% in circularly-polarized OLED

Xiao-Hong Ma, Jing Li, Peng Luo, Jia-Hua Hu, Zhen Han, Xi-Yan Dong (), Guohua Xie () and Shuang-Quan Zang ()
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Xiao-Hong Ma: Zhengzhou University
Jing Li: Zhengzhou University
Peng Luo: College of Chemistry and Chemical Engineering Henan Polytechnic University
Jia-Hua Hu: Zhengzhou University
Zhen Han: Zhengzhou University
Xi-Yan Dong: Zhengzhou University
Guohua Xie: Wuhan University
Shuang-Quan Zang: Zhengzhou University

Nature Communications, 2023, vol. 14, issue 1, 1-11

Abstract: Abstract Bright and efficient chiral coinage metal clusters show promise for use in emerging circularly polarized light-emitting materials and diodes. To date, highly efficient circularly polarized organic light-emitting diodes (CP-OLEDs) with enantiopure metal clusters have not been reported. Herein, through rational design of a multidentate chiral N-heterocyclic carbene (NHC) ligand and a modular building strategy, we synthesize a series of enantiopure Au(I)-Cu(I) clusters with exceptional stability. Modulation of the ligands stabilize the chiral excited states of clusters to allow thermally activated delayed fluorescence, resulting in the highest orange-red photoluminescence quantum yields over 93.0% in the solid state, which is accompanied by circularly polarized luminescence. Based on the solution process, a prototypical orange-red CP-OLED with a considerably high external quantum efficiency of 20.8% is prepared. These results demonstrate the extensive designability of chiral NHC ligands to stabilize polymetallic clusters for high performance in chiroptical applications.

Date: 2023
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DOI: 10.1038/s41467-023-39802-w

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