Effect of self-trapped excitons in the optical properties of manganese-alloyed hexagonal-phased metal halide perovskite
- Authors
- Han, Joo Hyeong; Samanta, Tuhin; Park, Yong Min; Cho, Han Bin; Min, Jeong Wan; Hwang, Seong Ju; Jang, Sung Woo; Im, Won Bin
- Issue Date
- Dec-2022
- Publisher
- Elsevier B.V.
- Keywords
- Metal halide perovskite; Self-trapped exciton; Mn2+ emission; Photoluminescence quantum yield
- Citation
- Chemical Engineering Journal, v.450, pp.1 - 9
- Indexed
- SCIE
SCOPUS
- Journal Title
- Chemical Engineering Journal
- Volume
- 450
- Start Page
- 1
- End Page
- 9
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/186174
- DOI
- 10.1016/j.cej.2022.138325
- ISSN
- 1385-8947
- Abstract
- Emission induced by self-trapped excitons (STEs) has recently been studied in several metal halide perovskites (MHPs), particularly in low-dimensional MHPs. STEs generally occur in low-dimensional MHPs owing to their soft lattices, strong electron–phonon coupling, and lattice distortion. However, the formation of STEs in all-inorganic high-dimensional MHPs, specifically in hexagonal phases, is challenging. From this perspective, we studied the formation of STEs in all-inorganic hexagonal-phase CsCdCl3 MHPs and further investigated the role of free excitons and STEs in the optical properties of CsCd(1-x)MnxCl3 MHPs. Mn2+ ion-activated CsCd(1-x)MnxCl3 MHPs were synthesized, and their crystal structures were refined. The CsCd(1-x)MnxCl3 MHPs exhibited orange emission upon 295 nm excitation with a high photoluminescence quantum yield of 74 %. Moreover, CsCd(1-x)MnxCl3 MHPs exhibited good thermal and chemical stability. We also investigated the effect of Mn2+ doping on CsCd(1-x)MnxCl3 single crystals, polycrystals, and nanocrystals. This work offers deep insights into the photophysical properties of MHPs as well as provides a promising approach to achieving high-quality, thermally, and chemically stable white-light emission.
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