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Photoemission of the Upconverted Hot Electrons in Mn-Doped CsPbBr3 Nanocrystals

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Title
Photoemission of the Upconverted Hot Electrons in Mn-Doped CsPbBr3 Nanocrystals
Author(s)
Chih-Wei Wang; Xiaohan Liu; Tian Qiao; Mohit Khurana; Alexey V. Akimo; Dong Hee Son
Publication Date
2022-08
Journal
NANO LETTERS, v.22, no.16, pp.6753 - 6759
Publisher
AMER CHEMICAL SOC
Abstract
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 nano crystals 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 twodimensional MHP nanocrystals in the upconversion process.
URI
https://pr.ibs.re.kr/handle/8788114/12377
DOI
10.1021/acs.nanolett.2c02342
ISSN
1530-6984
Appears in Collections:
Center for Nanomedicine (나노의학 연구단) > 1. Journal Papers (저널논문)
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