Highlights

• This paper uses anion passivation to construct wide-bandgap surface layers such as PbSO₄, Pb(OH)₂, and PbF₂ on CsPbBr₃
• The treated samples preserve 79% of original emission intensity up to 373 K, compared with only 17% for pristine CsPbBr₃.
• The improved nanocrystals enable thermally stable white LED devices with stable spectra, color gamut, and color coordinates under heat stress.

Summary

This article extends the thermal-stability strategy to lead halide perovskite nanocrystals used in white LEDs. The team treated CsPbBr₃ nanocrystals with specific anions that form wide-bandgap passivation layers on the surface. These layers repair surface defects and stabilize the inner perovskite core, reducing thermally activated carrier trapping and non-radiative loss. The result is much stronger emission retention at practical LED temperatures. The study is important because it translates a surface-chemistry principle into a device-level benefit: white LEDs with more stable brightness and color under thermal stress. It complements the cluster’s broader drive toward operationally durable nanocrystal emitters.

Citation: Q. Zhang et al., “Suppressing thermal quenching of lead halide perovskite nanocrystals by constructing a wide-bandgap surface layer for achieving thermally stable white light-emitting diodes,” Chemical Science, vol. 13, pp. 3719–3727, 2022, doi: 10.1039/D1SC06554H.