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.

明亮高效的手性造币金属簇显示出在新兴圆偏振发光材料和二极管中的应用前景。迄今为止，具有对映体纯金属簇的高效圆偏振有机发光二极管（CP-OLED）尚未见报道。在此，通过多齿手性N-杂环卡宾（NHC）配体的合理设计和模块化构建策略，我们合成了一系列具有优异稳定性的对映体纯Au(I)-Cu(I)簇。配体的调制稳定了团簇的手性激发态，以允许热激活延迟荧光，从而在固态下产生超过93.0%的最高橙红色光致发光量子产率，并伴有圆偏振发光。根据求解过程，制备了具有相当高的外量子效率（20.8%）的典型橙红色CP-OLED。这些结果证明了手性 NHC 配体在稳定多金属簇以实现手性光学应用中的高性能方面具有广泛的可设计性。