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Size-dependent dark exciton properties in cesium lead halide perovskite quantum dots

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Title
Size-dependent dark exciton properties in cesium lead halide perovskite quantum dots
Author(s)
Rossi, Daniel; Qiao, Tian; Liu, Xiaohan; Khurana, Mohit; Akimov, Alexey V.; Cheon, Jinwoo; Son, Dong Hee
Publication Date
2020-11
Journal
Journal of Chemical Physics, v.153, no.18, pp.1 - 7
Publisher
AMER INST PHYSICS
Abstract
The fine structure of the band edge exciton and the dark exciton photoluminescence (PL) are topics of significant interest in the research of semiconducting metal halide perovskite nanocrystals, with several conflicting reports on the level ordering of the bright and dark states and the accessibility of the emitting dark states. Recently, we observed the intense dark exciton PL in strongly confined CsPbBr3 nanocrystals at cryogenic temperatures, in contrast to weakly confined nanocrystals lacking dark exciton PL, which was explained by the confinement enhanced bright-dark exciton splitting. In this work, we investigated the size-dependence of the dark exciton photoluminescence properties in CsPbBr3 and CsPbI3 quantum dots in the strongly confined regime, showing the clear role of confinement in determining the bright-dark energy splitting (ΔEBD) and the dark exciton lifetime (τD). We observe the increase in both ΔEBD and τD with increasing quantum confinement in CsPbBr3 and CsPbI3 QDs, consistent with the earlier predictions on the size-dependence of ΔEBD and τD. Our results show that quantum confinement plays a crucial role in determining the accessibility to the dark exciton PL and its characteristics in metal halide perovskite nanocrystals
URI
https://pr.ibs.re.kr/handle/8788114/9120
DOI
10.1063/5.0027972
ISSN
0021-9606
Appears in Collections:
Center for Nanomedicine (나노의학 연구단) > 1. Journal Papers (저널논문)
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