High-Performance Narrowband Circularly Polarized Luminescence Mediated by Metal Cluster

Narrowband circularly polarized luminescent materials are crucial for high color purity 3D displays and chiral optoelectronic devices. In this work, we propose a metal cluster-mediated emission narrowing strategy that significantly enhances the planarity and rigidity of molecules by constructing a linear PtAu2 cluster, thereby synergistically optimizing luminescence efficiency and narrowing spectral width. The synthesized chiral cluster enantiomers R/S-PtAu2 exhibit narrowband circularly polarized luminescence (CPL) with photoluminescence quantum yield (PLQY) over 50%, full width at half-maximum (FWHM) of 33 nm, and asymmetric factors (gPL) of ±2.4 × 10-3 in CH2Cl2 solutions. The PLQY of R/S-PtAu2 in the doping films is further improved to over 97%, while maintaining excellent color purity. Solution-processed circularly polarized organic light-emitting diodes fabricated achieved high-performance narrowband circularly polarized electroluminescence (CPEL), with a maximum external quantum efficiency of 17.1%, a FWHM of 38 nm, and a CPEL asymmetric factor (gEL) of ±2.5 × 10-3. This research not only achieves the integration of strong CPL and narrowband emission in metal clusters but also provides design guidance and experimental evidence for the development of chiral luminescent materials for high-definition display and photonics applications.