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Ammonium acetate passivated CsPbI3 perovskite nanocrystals for efficient red light-emitting diodes

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Abstract

Lead halide perovskite nanocrystals (PNCs) have very recently emerged as promising emitters for their superior optoelectronic properties. However, the defects in perovskite itself make it susceptible to the external environment and internal ion migration, resulting in low photoluminescence quantum yield (PLQY) and poor device efficiency. Herein, we developed a method to reduce the surface defects of PNCs by introducing ammonium acetate in the synthesis of CsPbI3 PNCs. The addition of ammonium acetate can effectively eliminate undesired surface metallic lead cations and dangling bonds, resulting in an enhanced PLQY and stability. The passivated PNCs have an overall up-shift energy level, demonstrating better hole injection efficiency. As a result, the red light-emitting diodes (LEDs) fabricated with the passivated CsPbI3 PNCs achieved an optimal EQE of 10.6% and a maximum brightness of 981 cd m−2, which are 3.1 and 2.4 times that of unpassivated PNCs based devices, respectively.

Graphical abstract: Ammonium acetate passivated CsPbI3 perovskite nanocrystals for efficient red light-emitting diodes

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Article information


Submitted
18 Feb 2020
Accepted
13 Mar 2020
First published
16 Mar 2020

Nanoscale, 2020, Advance Article
Article type
Paper

Ammonium acetate passivated CsPbI3 perovskite nanocrystals for efficient red light-emitting diodes

Y. Zhu, J. Zhao, G. Yang, X. Xu and G. Pan, Nanoscale, 2020, Advance Article , DOI: 10.1039/D0NR01378A

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