Chinese Journal of Quantum Electronics, Volume. 39, Issue 4, 605(2022)
Double resonance up-conversion fluorescence enhancement of tungsten disulfide films
In order to explore the exciton effect of two-dimensional layered transition metal sulfide, especially the up-conversion fluorescence process, the layered WS2 sample was taken as an example to study. Using 532 nm continuous laser and micro-Raman technology, the physical origin and basic properties of X0 and X- exciton of WS2 crystal were investigated. The continuous laser of 633 nm was used to realize single photon up-conversion fluorescence enhancement, which confirmed the physical mechanism of double resonance, that is, the incident light resonates with the X- exciton state, then exciton transitions to the high-energy X0 exciton state with the aid of optical phonons A1g and E12g, and finally produces spontaneous up-conversion fluorescence. In addition, the influencing factors of X0 were further analyzed including exposure time, temperature and excitation power. The fitting results showed that the up-conversion fluorescence efficiency could be improved by appropriately increasing the exposure time, decreasing the ambient temperature and increasing the excitation power.
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HONG Huihui, Cho-Tung Yip. Double resonance up-conversion fluorescence enhancement of tungsten disulfide films[J]. Chinese Journal of Quantum Electronics, 2022, 39(4): 605
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Received: Jan. 19, 2021
Accepted: --
Published Online: Aug. 24, 2022
The Author Email: Huihui HONG (18S058460@stu.hit.edu.cn)