Light-emitting diodes based on perovskite nanocrystals (PNCs-LEDs) have gained great interest for next-generation display and lighting technologies prized for their color purity, high brightness, and luminous efficiency which approach the intrinsic limit imposed by light extraction from the device structure. Although the time is ripe for the development of effective light outcoupling strategies to further boost the device performance, this technologically relevant aspect of PNC-LEDs is still without a definitive solution. Here, following theoretical guidelines and without the integration of complex photonic structures, we realize stable PNC-LEDs with external quantum efficiency (EQE) as high as 26.7%. Key to such performance is channeling the recombination zone in PNC emissive layers as thin as 10 nm, which we achieve by finely balancing charge transport using CsPbBr3 PNCs resurfaced with a nickel oxide layer. The ultrathin approach is general and, in principle, applicable to other perovskite nanostructures for fabricating highly efficient, color-tunable transparent LEDs.

Wan, Q., Zheng, W., Zou, C., Carulli, F., Zhang, C., Song, H., et al. (2023). Ultrathin Light-Emitting Diodes with External Efficiency over 26% Based on Resurfaced Perovskite Nanocrystals. ACS ENERGY LETTERS, 8(2), 927-934 [10.1021/acsenergylett.2c02802].

Ultrathin Light-Emitting Diodes with External Efficiency over 26% Based on Resurfaced Perovskite Nanocrystals

Francesco Carulli;Sergio Brovelli
2023

Abstract

Light-emitting diodes based on perovskite nanocrystals (PNCs-LEDs) have gained great interest for next-generation display and lighting technologies prized for their color purity, high brightness, and luminous efficiency which approach the intrinsic limit imposed by light extraction from the device structure. Although the time is ripe for the development of effective light outcoupling strategies to further boost the device performance, this technologically relevant aspect of PNC-LEDs is still without a definitive solution. Here, following theoretical guidelines and without the integration of complex photonic structures, we realize stable PNC-LEDs with external quantum efficiency (EQE) as high as 26.7%. Key to such performance is channeling the recombination zone in PNC emissive layers as thin as 10 nm, which we achieve by finely balancing charge transport using CsPbBr3 PNCs resurfaced with a nickel oxide layer. The ultrathin approach is general and, in principle, applicable to other perovskite nanostructures for fabricating highly efficient, color-tunable transparent LEDs.
Articolo in rivista - Articolo scientifico
Light-emitting diodes, Perovskite nanocrystals, Resurfacing, Otucoupling
English
10-gen-2023
2023
8
2
927
934
none
Wan, Q., Zheng, W., Zou, C., Carulli, F., Zhang, C., Song, H., et al. (2023). Ultrathin Light-Emitting Diodes with External Efficiency over 26% Based on Resurfaced Perovskite Nanocrystals. ACS ENERGY LETTERS, 8(2), 927-934 [10.1021/acsenergylett.2c02802].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10281/400923
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