Efficient and Stable Broadband Luminescence in Antimony-doped Hybrid Chloride Single Crystals for Full-spectrum LED Application

Abstract In recent years full-spectrum light-emitting diodes (LEDs) have attracted considerable interest due to their continuous spectral distribution and superior color rendering capabilities.In this work zero-dimensional DMA 4 InCl 7 Sb 3+ (DMA=C 2 H 8 N) hybrid metal halide single crystals were synthesized via an anti-solvent approach.Under 343 nm ultraviolet excitation the crystals exhibited broadband orange-yellow emission centered at 620 nm achieving an exceptional quantum efficiency of 95. 2% with a broad full width at half maximum (FWHM) of 148 nm.Density functional theory (DFT) calculations showed that Sb 3+ doping effectively improves the band structure of host while the spectral characterizations demonstrated that the broadband emission originates from the triplet self-trapped exciton (STE) of SbCl 6 3-.Temperature-dependent photoluminescence spectra further revealed high photoluminescence thermal stability with the material maintaining 81.2% of its room-temperature (RT) emission intensity at 150 .Leveraging these superior luminescent properties we fabricated a full-spectrum LED device with a high color rendering index (CRI) of 94. 9.This work provides a strategic reference for designing hybrid metal halide luminescent materials that combine efficient broadband emission with suppressed thermal quenching. Key words full-spectrum