Chinese Journal of Quantum Electronics ›› 2021, Vol. 38 ›› Issue (4): 420-427.doi: 10.3969/j.issn.1007-5461.2021.04.003

• Spectroscopy • Previous Articles     Next Articles

Application of variable temperature fluorescence test system with adjustable pump intensity in quasi-2D perovskite materials

ZHANG Bo, GUO Xiuwen, CUI Minghuan, SUN Mingze, LI Gaoqiang, ZHOU Jing, QIN Chaochao∗   

  1. ( Henan Key Laboratory of Infrared Materials & Spectrum Measures and Applications, College of Physics, Henan Normal University, Xinxiang 453007, China )
  • Received:2020-06-24 Revised:2020-07-22 Published:2021-07-28 Online:2021-07-27
  • Supported by:
    National Natural Science Foundation of China;Henan Science and Technology Research Project;Henan Provincial Department of Education Key Project

Abstract: Exciton properties have a decisive influence in the luminescence mechanism of quasi-2D per- ovskite material. Measurement of exciton-phonon coupling strength and exciton binding energy is a pow- erful means of investigating exciton properties of quasi-two-dimensional perovskite materials, which can provide a key scientific basis for revealing the internal light emission mechanism and further improving the fluorescence quantum yield. By combining the adjustable pump intensity fluorescence testing system with the liquid nitrogen thermostat, a set of variable temperature fluorescence test system with adjustable pump intensity is built and controlled by the LABVIEW program. Then the exciton and luminescence properties of quasi two-dimensional perovskite film samples are studied by using the built system. Theexperimental results show that the exciton-longitudinal optical phonon coupling strength and exciton binding energy decrease with the increase of ⟨n⟩-value of quasi-two-dimensional perovskite. In addition, by measuring the adjustable pump intensity fluorescence at room temperature with the built system, the optical gain of quasi-two-dimensional perovskite films is explored, and it is shown that the amplified threshold of spontaneous emission of the film is 3.2 µJ/cm2.

Key words: spectroscopy, exciton properties, variable temperature fluorescence, quasi-2D perovskite; amplified spontaneous emission

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