Ce4+ doping to modulate electrochemical and radiative-charge-transfer behaviors of CsPbBr3 perovskite nanocrystals

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Detail(s)

Original languageEnglish
Article number114546
Number of pages6
Journal / PublicationJournal of Electroanalytical Chemistry
Volume876
Online published1 Aug 2020
Publication statusPublished - 1 Nov 2020

Abstract

Tunable morphology and radiative charge transfer of perovskite nanocrystals (PNCs) were achieved by heterovalently doping CsPbBr3 PNCs with Ce(IV) cation in a hot-injection and doping-in-growth combined way. Ce(IV)-doping could bring out a new tetragonal CsPb2Br5 phase within the PNCs, and transform cubic CsPbBr3 PNCs to Ce4+-doped CsPbBr3 PNCs with a dot-shaped morphology of smaller size. Ce4+-doped CsPbBr3 PNCs exhibited enhanced absorption and electrochemical oxidative response as well as decreased photoluminescence and electrochemiluminescence than parent CsPbBr3 PNCs. Processing Ce4+-doped CsPbBr3 PNCs with NH3•H2O could eliminate the effects of ionic Ce(IV) dopants via forming CeO2, and enable CsPbBr3-CeO2 hybrids to directionally grow to columnar-morphology with partially restored photoluminescence and electrochemiluminescence.

Research Area(s)

  • CsPbBr perovskite nanocrystals, Ce(IV) cation, Heterovalently doping, Photoluminescence, Electrochemiluminescence