Quantum-dots based materials for temperature sensing: effect of cyclic heating-cooling on fluorescence
- 69 Downloads
Using the temperature dependence of the fluorescence of quantum dots (QDs) in the sensing of temperature is a promising field. In this work, we systematically study the effect of cyclic heating and cooling on the fluorescence of CdSe/ZnS QD and PMMA-QD composite in air. The experimental results show that increasing the temperature causes red-shift of the PL (photoluminescence) emission peak and the decrease of the PL intensity, and decreasing the temperature causes blue-shift of the PL emission peak and the increase of the PL intensity for all the QDs presented in both media. There exists a critical temperature, above which the heating completely damages the surface structures of the QDs and leads to the loss of the luminescence characteristics of the QDs. Placing CdSe/ZnS QDs in PMMA causes blue-shift of the PL emission peak, which likely is due to the shift of the ground state energy of the QDs. The heating-cooling cycle with high peak temperature up to 310 °C does not change the crystal structure of the ZnS in the CdSe/ZnS QDs.
KeywordsQDs Heating-cooling PL intensity Wavelength Irreversibility Temperature sensor
W Luan is grateful for the financial support from the National Natural Science Fund of China (51475166).
Compliance with ethical standards
Conflict of interest
The authors declare that they have no conflict of interest.
- Fernández-Delgado N, Herrera M, Tavabi AH, Luysberg M, Dunin-Borkowski RE, Rodriguez-Cantó PJ, Abargues R, Martínez-Pastor JP, Molina SI (2018) Structural and chemical characterization of CdSe-ZnS core-shell quantum dots. Appl Surf Sci 457:93–97. https://doi.org/10.1016/j.apsusc.2018.06.149 CrossRefGoogle Scholar
- Wu Y, Li IL, Shuang CR, Zhai JP (2008) Temperature sensor based on iodine-doped hollow core photonic crystal fiber. International Conference on Microwave and Millimeter Wave Technology:890–892Google Scholar