The thermal quenching of light emission is a critical bottleneck that hampers the real-world application of lead halide perovskite nanocrystals in both electroluminescent and down-conversion light-emitting diodes. Here, we report CsPbBr3 perovskite nanocrystals with a temperature-independent emission efficiency of near unity and constant decay kinetics up to a temperature of 373 K. This unprecedented regime is obtained by a fluoride post-synthesis treatment that produces fluorine-rich surfaces with a wider energy gap than the inner nanocrystal core, yielding suppressed carrier trapping, improved thermal stability and efficient charge injection. Light-emitting diodes incorporating these fluoride-treated perovskite nanocrystals show a low turn-on voltage and spectrally pure green electroluminescence with an external quantum efficiency as high as 19.3% at 350 cd m−2. Importantly, nearly 80% of the room-temperature external quantum efficiency is preserved at 343 K, in contrast to the dramatic drop commonly observed for standard CsPbBr3 perovskite nanocrystal light-emitting diodes. These results provide a promising pathway for high-performance, practical light-emitting diodes based on perovskite nanostructures.

Liu, M., Wan, Q., Wang, H., Carulli, F., Sun, X., Zheng, W., et al. (2021). Suppression of temperature quenching in perovskite nanocrystals for efficient and thermally stable light-emitting diodes. NATURE PHOTONICS, 15(5), 379-385 [10.1038/s41566-021-00766-2].

Suppression of temperature quenching in perovskite nanocrystals for efficient and thermally stable light-emitting diodes

Carulli F.;Brovelli S.
;
2021

Abstract

The thermal quenching of light emission is a critical bottleneck that hampers the real-world application of lead halide perovskite nanocrystals in both electroluminescent and down-conversion light-emitting diodes. Here, we report CsPbBr3 perovskite nanocrystals with a temperature-independent emission efficiency of near unity and constant decay kinetics up to a temperature of 373 K. This unprecedented regime is obtained by a fluoride post-synthesis treatment that produces fluorine-rich surfaces with a wider energy gap than the inner nanocrystal core, yielding suppressed carrier trapping, improved thermal stability and efficient charge injection. Light-emitting diodes incorporating these fluoride-treated perovskite nanocrystals show a low turn-on voltage and spectrally pure green electroluminescence with an external quantum efficiency as high as 19.3% at 350 cd m−2. Importantly, nearly 80% of the room-temperature external quantum efficiency is preserved at 343 K, in contrast to the dramatic drop commonly observed for standard CsPbBr3 perovskite nanocrystal light-emitting diodes. These results provide a promising pathway for high-performance, practical light-emitting diodes based on perovskite nanostructures.
Articolo in rivista - Articolo scientifico
LED; Perovskite nanocrystals; thermal stability;
English
1-mar-2021
2021
15
5
379
385
reserved
Liu, M., Wan, Q., Wang, H., Carulli, F., Sun, X., Zheng, W., et al. (2021). Suppression of temperature quenching in perovskite nanocrystals for efficient and thermally stable light-emitting diodes. NATURE PHOTONICS, 15(5), 379-385 [10.1038/s41566-021-00766-2].
File in questo prodotto:
File Dimensione Formato  
s41566-021-00766-2.pdf

Solo gestori archivio

Tipologia di allegato: Publisher’s Version (Version of Record, VoR)
Dimensione 2.47 MB
Formato Adobe PDF
2.47 MB Adobe PDF   Visualizza/Apri   Richiedi una copia

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10281/328858
Citazioni
  • Scopus 219
  • ???jsp.display-item.citation.isi??? 209
Social impact