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) 2 Pb x Sn 1– x Br 4 (0 < x < 1, Bmpip + = 1-butyl-1-methyl-piperidinium, C 10 H 22 N + ) that crystallizes in a monoclinic system in the C 2/ c space group. Pb 2+ and Sn 2+ form a four-coordinate seesaw structure separated by organic cations forming a 0D structure. For different excitation wavelengths, (Bmpip) 2 Pb x Sn 1– x Br 4 (0 < x < 1) exhibits double-peaked emission at 470 and 670 nm. The emission color of (Bmpip) 2 Pb x Sn 1– x Br 4 can be easily tuned from orange-red to blue by adjusting the Pb/Sn molar ratio or excitation wavelength. Representatively, (Bmpip) 2 Pb 0.16 Sn 0.84 Br 4 exhibits approximately white-light emission with high photoluminescence quantum yield up to 39%. Interestingly, the color of (Bmpip) 2 Pb x Sn 1– x Br 4 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) 2 Pb x Sn 1– x Br 4 and 365 nm near-UV LED chips and exhibit high-quality light output.