Zn-Alloyed CsPbI3 Nanocrystals for Highly Efficient Perovskite Light-Emitting Devices

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalNot applicablepeer-review

9 Scopus Citations
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Author(s)

  • Xinyu Shen
  • Yu Zhang
  • Stephen V. Kershaw
  • Tianshu Li
  • Congcong Wang
  • Xiaoyu Zhang
  • Wenyan Wang
  • Daguang Li
  • Yinghui Wang
  • Min Lu
  • Lijun Zhang
  • Chun Sun
  • Dan Zhao
  • Guanshi Qin
  • Xue Bai
  • William W. Yu

Detail(s)

Original languageEnglish
Pages (from-to)1552-1559
Journal / PublicationNano Letters
Volume19
Issue number3
Early online date11 Feb 2019
Publication statusPublished - 13 Mar 2019

Abstract

We alloyed Zn2+ into CsPbI3 perovskite nanocrystals by partial substitution of Pb2+ with Zn2+ , which does not change their crystalline phase. The resulting alloyed CsPb0.64Zn0.36I3 nanocrystals exhibited an improved, close-to-unity photoluminescence quantum yield of 98.5% due to the increased radiative decay rate and the decreased non-radiative decay rate. They also showed an enhanced stability, which correlated with improved effective Goldschmidt tolerance factors, by the incorporation of Zn2+ ions with a smaller radius than the Pb2+ ions. Simultaneously, the nanocrystals switched from n-type (for CsPbI3 ) to nearly ambipolar for the alloyed nanoparticles. The hole injection barrier of electroluminescent LEDs was effectively eliminated by using alloyed CsPb0.64Zn0.36I3 nanocrystals, and a high peak external quantum efficiency of 15.1% has been achieved.

Research Area(s)

  • alloying, enhanced stability, improved photoluminescence quantum yield, Lead halide perovskite nanocrystals, light-emitting devices

Citation Format(s)

Zn-Alloyed CsPbI3 Nanocrystals for Highly Efficient Perovskite Light-Emitting Devices. / Shen, Xinyu; Zhang, Yu; Kershaw, Stephen V.; Li, Tianshu; Wang, Congcong; Zhang, Xiaoyu; Wang, Wenyan; Li, Daguang; Wang, Yinghui; Lu, Min; Zhang, Lijun; Sun, Chun; Zhao, Dan; Qin, Guanshi; Bai, Xue; Yu, William W.; Rogach, Andrey L.

In: Nano Letters, Vol. 19, No. 3, 13.03.2019, p. 1552-1559.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalNot applicablepeer-review