Highlights

• This Nature Photonics study tackles thermal quenching, a major obstacle for real-world perovskite nanocrystal LEDs.
• Fluoride treatment suppresses efficiency loss at elevated temperatures, maintaining stable photoluminescence quantum yield up to about 370 K.
• The treated nanocrystals enable LEDs with EQE up to 19.3% and much better performance retention under thermal stress.

Summary

Even when perovskite nanocrystals are bright at room temperature, they often lose emission efficiency during LED operation because devices heat up. This paper addresses that overlooked bottleneck. The team used fluoride-based post-synthesis treatment to passivate CsPbBr₃ perovskite nanocrystals and suppress thermally activated non-radiative losses. Importantly, the treatment preserves charge injection, allowing the nanocrystals to be used in efficient LEDs rather than only in passive down-conversion materials. The novelty is the combination of thermal stability and device compatibility. This work expands the cluster from material protection to operational reliability under realistic LED conditions.

Citation: M. Liu et al., “Suppression of temperature quenching in perovskite nanocrystals for efficient and thermally stable light-emitting diodes,” Nature Photonics, vol. 15, pp. 379–385, 2021, doi: 10.1038/s41566-021-00766-2.