研究目的
Investigating the temperature-dependent photoluminescence properties of cesium lead halide perovskite (CsPbX3, X = Br, Cl, I) quantum dots to understand their thermal quenching, bandgap shifting, and linewidth broadening behaviors.
研究成果
The study successfully synthesized CsPbX3 QDs with tunable PL emission by varying the halide ion composition. Temperature-dependent PL spectroscopy revealed thermal quenching, bandgap blue shifting, and linewidth broadening. The activation energy (ΔE) and Huang–Rhys factor (S) were obtained, showing that ΔE decreases and S increases from X = I to Br to Cl, indicating enhanced electron–phonon coupling.
研究不足
The study is limited to the temperature range of 10 K to 290 K and does not explore the effects of other environmental factors such as humidity or oxygen on the PL properties of CsPbX3 QDs.
1：Experimental Design and Method Selection:
The study involved synthesizing CsPbX3 QDs with varying halide ion compositions and analyzing their temperature-dependent PL properties. Theoretical models were used to understand the thermal quenching process, bandgap shifting, and linewidth broadening.
2：Sample Selection and Data Sources:
CsPbX3 QDs were synthesized with different halide ion compositions (Br, Cl, I). The PL spectra were measured from 10 K to 290 K.
3：List of Experimental Equipment and Materials:
A Jobin Yvon FluoroLog-3 fluorescence spectrometer for PL spectra, a Hitachi UV-4100 absorption spectrophotometer for absorption spectra, and a Hitachi HT7700 transmission electron microscope for morphology and size observation.
4：Experimental Procedures and Operational Workflow:
CsPbX3 QDs were synthesized by varying the halide ion composition. The PL spectra were measured at different temperatures to study the thermal quenching, bandgap shifting, and linewidth broadening.
5：Data Analysis Methods:
The data were fitted using theoretical models to obtain activation energy (ΔE) and Huang–Rhys factor (S).
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