期刊
NANOSCALE
卷 11, 期 7, 页码 3145-3153出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c8nr09634a
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类别
资金
- Ministry of Science and Technology [2017YFA0205004, 2017YFA0304600, 2017YFA0205700, 2016YFA0200700]
- National Natural Science Foundation of China [61307120, 61704038, 11474187, 11874130, 61774003, 61521004, 21673054]
- Natural Science Foundation of Beijing Municipality [4182076, 4184109]
- Peking University
- Chinese government
- open research fund program of the State Key Laboratory of Low-Dimensional Quantum Physics
Recently, the light-matter interaction of perovskite microcavities has been widely explored for its great potential in low-threshold lasing devices. However, the mechanism of perovskite lasing remains unclear to date. In this study, we demonstrated high-quality single-mode excitonic lasing in CsPbBr3 microspheres, providing an ideal platform to study the underlying physics of lasing behavior. We show that the lasing mechanism shifts from the exciton-exciton scattering to the exciton-phonon scattering with the increase in temperature from 77 to 300 K, which was verified by temperature-dependent photoluminescence (PL), time-resolved photoluminescence (TRPL) as well as temperature-dependent Raman spectroscopy. Furthermore, by analyzing PL line width broadening with varied temperatures, we found that two different phonon modes were involved in the exciton-phonon scattering process. The scattering from the low-energy phonon (approximate to 8.6 meV) is the dominant source of exciton-phonon coupling in the intermediate temperature range (77 to 230 K), while the high-energy phonon (approximate to 15.3 meV) dominates from 230 K to room temperature. These results confirm the lasing mechanism in such perovskite-based micro/nano-cavities and significantly influence the development of future low-threshold lasers.
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