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Unusual Pressure-Induced Self-Trapped Exciton to Free Exciton Transfer in Chiral 2D Lead Bromide Perovskites.
Gao, Fei-Fei; Qin, Yan; Li, Zhi-Gang; Li, Wei; Hao, Jing; Li, Xiang; Liu, Yungui; Howard, Christopher J; Wu, Xiang; Jiang, Xingxing; Lin, Zheshuai; Lu, Peixiang; Bu, Xian-He.
Afiliação
  • Gao FF; School of Materials Science and Engineering, Smart Sensing Interdisciplinary Science Center, Nankai University & TKL of Metal and Molecule Based Material Chemistry, Tianjin 300350, China.
  • Qin Y; Key Laboratory of Functional Inorganic Materials Chemistry (Ministry of Education) & School of Chemistry and Materials Science, Heilongjiang University, Harbin 150080, China.
  • Li ZG; School of Physics & Wuhan National Laboratory for Optoelectronics, Huazhong University of Science and Technology, Wuhan 430074, China.
  • Li W; Ordered Matter Science Research Center, Nanchang University, Nanchang 330031, China.
  • Hao J; School of Materials Science and Engineering, Smart Sensing Interdisciplinary Science Center, Nankai University & TKL of Metal and Molecule Based Material Chemistry, Tianjin 300350, China.
  • Li X; School of Materials Science and Engineering, Smart Sensing Interdisciplinary Science Center, Nankai University & TKL of Metal and Molecule Based Material Chemistry, Tianjin 300350, China.
  • Liu Y; College of Chemistry & State Key Lab of Elemento-Organic Chemistry, Nankai University, Tianjin 300071, China.
  • Howard CJ; State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, Wuhan 430074, China.
  • Wu X; State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, Wuhan 430074, China.
  • Jiang X; School of Engineering, University of Newcastle, New South Wales 2308, Australia.
  • Lin Z; State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, Wuhan 430074, China.
  • Lu P; Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100190, China.
  • Bu XH; Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100190, China.
ACS Nano ; 18(4): 3251-3259, 2024 Jan 30.
Article em En | MEDLINE | ID: mdl-38227818
ABSTRACT
The phenomenon of pressure-induced emission alterations related to complex excitonic dynamics in 2D lead halide perovskites (LHPs) has gained considerable attention for understanding their structure-property relationship and obtaining inaccessible luminescence under ambient conditions. However, the well-known pressure-induced emissions are limited to the formation of self-trapped excitons (STEs) due to the structural distortion under compression, which goes against the advantage of the highly pure emission of LHPs. Here, the pressure-induced detrapping from STEs to free excitons (FEs) accompanied by the dramatic transition from broadband orangish emission to narrow blue emission has been achieved in chiral 2D LHPs and R- and S-[4MeOPEA]2PbBr4, (4MeOPEA = 4-methoxy-α-methylbenzylammonium). The combined experimental and calculated results reveal that the distortion level of PbBr6 octahedra of R- and S-[4MeOPEA]2PbBr4 exhibits an unusually significant reduction as the applied pressure increases, which leads to decreased electron-phonon coupling and self-trapped energy barrier and consequently enables the detrapping of STEs to FEs. This work illustrates the dramatic exciton transfer in 2D LHPs and highlights the potential for realizing highly efficient and pure light emissions by manipulating the structural distortion via strain engineering.
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Texto completo: 1 Base de dados: MEDLINE Idioma: En Ano de publicação: 2024 Tipo de documento: Article

Texto completo: 1 Base de dados: MEDLINE Idioma: En Ano de publicação: 2024 Tipo de documento: Article