期刊
NANO LETTERS
卷 21, 期 21, 页码 9085-9092出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.1c02775
关键词
CsPbBr3; Nanoplatelets; Polarization; Crystal Configuration; Bright Exciton
类别
资金
- ETH Zurich via the ETH Postdoctoral Fellowship [FEL-15 18-2]
- Marie Sklodowska-Curie Actions COFUND Program
- European Union's Horizon 2020 program, through a FET Open research and innovation action [899141]
- International Max Planck Research School (IMPRS) for Interface Controlled Materials for Energy Conversion (SurMat)
This study investigates the luminescence and crystal structure of CsPbBr3 nanoplatelets using polarization-resolved spectroscopy at liquid helium temperature, revealing the existence of two distinct crystal configurations in the nanoplatelets. The absolute orientation of individual nanoplatelets on the substrate can be determined purely by optical means.
Quantum-confined nanostructures of CsPbBr3 with luminescence quantum efficiencies approaching unity have shown tremendous potential for lighting and quantum light applications. In contrast to CsPbBr3 quantum dots, where the fine structure of the emissive exciton state has been intensely discussed, the relationship among lattice orientation, shape anisotropy, and exciton fine structure in lead halide nanoplatelets has not yet been established. In this work, we investigate the fine structure of the bright triplet exciton of individual CsPbBr3 nanoplatelets by polarization-resolved micro- and magnetophotoluminescence spectroscopy at liquid helium temperature and find a large zero-field splitting of up to 2.5 meV. A unique relation between the crystal structure and the photoluminescence emission confirms the existence of two distinct crystal configurations in such nanoplatelets with different alignments of the crystal axes with respect to the nanoplatelet facets. Polarization-resolved experiments eventually allow us to determine the absolute orientation of an individual nanoplatelet on the substrate purely by optical means.
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