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- W3214193558 abstract "CsPbI3 perovskite nanocrystals (NCs) are emerging as promising materials for optoelectronic devices because of their superior optical properties. However, the poor stability of CsPbI3 NCs has become a huge bottleneck for practical applications. Herein, we report an effective strategy of Mg2+-assisted passivation of surface defects to obtain high emission efficiency and stability in CsPbI3 NCs. It is found that the introduced Mg2+ ions are mainly distributed on the surface of NCs and then passivate the NC defects, enhancing radiative decay rate and reducing nonradiative decay rate. As a result, the as-prepared Mg2+-treated CsPbI3 (Mg-CsPbI3) NCs exhibit the highest photoluminescence quantum yield (PLQY) of 95%. The Mg-CsPbI3 NC colloidal solution retains 80% of its original PLQY after 80 days of atmosphere exposure. The red perovskite light-emitting diodes based on the Mg-CsPbI3 NCs demonstrate an external quantum efficiency of 8.4%, which shows an almost 4-fold improvement compared to the devices based on the untreated NCs." @default.
- W3214193558 created "2021-11-22" @default.
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- W3214193558 date "2021-11-09" @default.
- W3214193558 modified "2023-10-16" @default.
- W3214193558 title "Mg<sup>2+</sup>-Assisted Passivation of Defects in CsPbI<sub>3</sub> Perovskite Nanocrystals for High-Efficiency Photoluminescence" @default.
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- W3214193558 doi "https://doi.org/10.1021/acs.jpclett.1c03258" @default.
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