High‐Efficiency Ultrabroadband Warm White Light Emission from a Single‐Component Lead‐Free Perovskite with Record‐Low Blue‐Violet Content

Abstract Single‐component white‐light emitters have attracted considerable attention due to their potential in energy‐efficient lighting and display technologies. Nevertheless, the development of high‐efficiency, ultrabroadband emitters that are more eye‐friendly—particularly those with minimized blue‐violet emission—remains a critical yet formidable challenge. In this work, the demonstration of a high‐performance, ultrabroadband single‐component white‐light‐emitting material based on lead‐free Sb‐doped zinc halides is reported, featuring significantly reduced blue‐violet emission. The introduction of Sb 3+ dopants induces external self‐trapped exciton emission, leading to dual‐band white‐light emission that spans the entire visible spectrum. The optimized material exhibits a record‐high photoluminescence quantum yield of 40.7% under 310 nm excitation and an exceptionally low blue‐light proportion of only 12.6%—the lowest among reported single‐component white‐light emitters. Photophysical investigations reveal that the emission originates from two distinct self‐trapped states within the [SbCl 4 ] − tetrahedron, with their relative intensities tunable via excitation wavelength. Benefiting from these unique optical properties, the material enables the fabrication of white light‐emitting diodes (LEDs) with suppressed blue‐violet output and precise Commission Internationale de l'Eclairage (CIE) coordinates of (0.40, 0.39). Additionally, the excitation‐dependent luminescence characteristics render it promising for applications in anti‐counterfeiting and optical information encryption.