Efficiency-Tunable Single-Component White-Light Emission Realized in Hybrid Halides Through Metal Co-Occupation.

Organic-inorganic hybrid metal halides have attracted widespread attention as emerging optoelectronic materials, especially in solid-state lighting, where they can be used as single-component white-light phosphors for white light-emitting diodes. Herein, we have successfully synthesized a zero-dimensional (0D) organic-inorganic hybrid mixed-metal halide (Bmpip)PbSnBr (0 < < 1, Bmpip = 1-butyl-1-methyl-piperidinium, CHN) that crystallizes in a monoclinic system in the 2/ space group. Pb and Sn form a four-coordinate seesaw structure separated by organic cations forming a 0D structure. For different excitation wavelengths, (Bmpip)PbSnBr (0 < < 1) exhibits double-peaked emission at 470 and 670 nm. The emission color of (Bmpip)PbSnBr can be easily tuned from orange-red to blue by adjusting the Pb/Sn molar ratio or excitation wavelength. Representatively, (Bmpip)PbSnBr exhibits approximately white-light emission with high photoluminescence quantum yield up to 39%. Interestingly, the color of (Bmpip)PbSnBr can also be easily tuned by temperature, promising its potential for application in temperature measurement and indication. Phosphor-converted light-emitting diodes are fabricated by combining (Bmpip)PbSnBr and 365 nm near-UV LED chips and exhibit high-quality light output.