Chemical Research in Chinese Universities ›› 2022, Vol. 38 ›› Issue (2): 588-595.doi: 10.1007/s40242-021-1153-z

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Highly Stable CsPbBr3 Nanocrystal Phosphors by Surface Passivation and Encapsulation

SHANG Zheliang, XUE Weinan, WANG Wei, LI Yan   

  1. Shanghai Key Laboratory of Functional Materials Chemistry, Institute of Applied Chemistry, School of Chemistry and Molecular Engineering, East China University of Science and Technology, Shanghai 200237, P. R. China
  • Received:2021-03-31 Revised:2021-04-26 Online:2022-04-01 Published:2022-05-18
  • Contact: LI Yan E-mail:yli@ecust.edu.cn
  • Supported by:
    This work was supported by the State Key Research Development Program of China(No.2016YFA0204200) and the National Natural Science Foundation of China(Nos.21771063, 21975075).

Abstract: The colloidal all-inorganic CsPbX3(X=I, Br, Cl) perovskite nanocrystals(NCs) with unique optical properties have attracted considerable attention in the field of semiconductor nanocrystals, but their application is hindered by stability issues caused by surface defects and environmental factors. Usually with inert layer encapsulation, the stability of CsPbX3 NCs can be significantly enhanced. However, due to the loss of highly dynamic oleic acid/oleylamine ligands, it is usually accompanied by a decrease in the photoluminescence quantum yield(PLQY). Herein, we report a facile method for preparing CsPbBr3 NCs based green phosphors with high stability and bright emission. With modification of colloidal CsPbBr3 NCs by di-dodecyldimethylammonium bromide and sequent encapsulation in the as-synthesized mesoporous MOF-5, the green emitting phosphors with enhanced stability and a PLQY of 77% were obtained. The phosphors exhibit enhanced resistance against ambient oxygen, UV light, heat treatment and water. These excellent properties show the potential value of our prepared NCs as stable phosphors in light-emitting devices.

Key words: Perovskite nanocrystal, Phosphor, Surface passivation, Encapsulation, Mesoporous MOF-5