期刊
JOURNAL OF PHYSICAL CHEMISTRY C
卷 123, 期 8, 页码 5128-5135出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.jpcc.9b00091
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资金
- SRT on New Materials of HKU
- National Natural Science Foundation of China [61604122, 51572216, 61774124]
The role of exciton-phonon coupling in light emission in cesium lead bromide (CsPbBr3) nanosheets is investigated with combined photoluminescence spectroscopy and the multimode Brownian oscillator model. A good agreement between theory and experiment in the low temperature range of 5-40 K enables us to determine several key parameters, including the dimensionless Huang-Rhys factor characterizing the exciton-longitudinal-optical phonon coupling strength and the damping constant accounting for the phonon bath (quasi-continuous acoustic phonons) dissipation. It is found that the Huang-Rhys factor of the free excitons peculiarly tends to diminish upon increasing the temperature in the interested low temperature range. However, the damping constant shows a linear increase with temperature in the interested temperature range. These new findings may deepen the understanding of the exciton-phonon coupling in CsPbBr3 nanosheets and relevant solids.
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