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Photoemission of the Upconverted Hot Electrons in Mn-Doped CsPbBr3 Nanocrystals.
Wang, Chih-Wei; Liu, Xiaohan; Qiao, Tian; Khurana, Mohit; Akimov, Alexey V; Son, Dong Hee.
Afiliación
  • Wang CW; Department of Chemistry, Texas A&M University, College Station, Texas 77843, United States.
  • Liu X; Department of Physics and Astronomy, Texas A&M University, College Station, Texas 77843, United States.
  • Qiao T; Department of Chemistry, Texas A&M University, College Station, Texas 77843, United States.
  • Khurana M; Department of Physics and Astronomy, Texas A&M University, College Station, Texas 77843, United States.
  • Akimov AV; Department of Physics and Astronomy, Texas A&M University, College Station, Texas 77843, United States.
  • Son DH; Department of Chemistry, Texas A&M University, College Station, Texas 77843, United States.
Nano Lett ; 22(16): 6753-6759, 2022 Aug 24.
Article en En | MEDLINE | ID: mdl-35939549
Hot electrons play a crucial role in enhancing the efficiency of photon-to-current conversion or photocatalytic reactions. In semiconductor nanocrystals, energetic hot electrons capable of photoemission can be generated via the upconversion process involving the dopant-originated intermediate state, currently known only in Mn-doped cadmium chalcogenide quantum dots. Here, we report that Mn-doped CsPbBr3 nanocrystals are an excellent platform for generating hot electrons via upconversion that can benefit from various desirable exciton properties and the structural diversity of metal halide perovskites (MHPs). Two-dimensional Mn-doped CsPbBr3 nanoplatelets are particularly advantageous for hot electron upconversion due to the strong exciton-dopant interaction mediating the upconversion process. Furthermore, nanoplatelets reveal evidence for the hot electron upconversion via long-lived dark excitons in addition to bright excitons that may enhance the upconversion efficiency. This study establishes the feasibility of hot electron upconversion in MHP hosts and demonstrates the potential merits of two-dimensional MHP nanocrystals in the upconversion process.
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Texto completo: 1 Bases de datos: MEDLINE Idioma: En Revista: Nano Lett Año: 2022 Tipo del documento: Article País de afiliación: Estados Unidos

Texto completo: 1 Bases de datos: MEDLINE Idioma: En Revista: Nano Lett Año: 2022 Tipo del documento: Article País de afiliación: Estados Unidos