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Quantum-dots based materials for temperature sensing: effect of cyclic heating-cooling on fluorescence

  • Ying Chen
  • Weiling LuanEmail author
  • Shaofu Zhang
  • Fuqian YangEmail author
Research Paper
  • 69 Downloads

Abstract

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.

Keywords

QDs Heating-cooling PL intensity Wavelength Irreversibility Temperature sensor 

Notes

Funding information

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.

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Copyright information

© Springer Nature B.V. 2019

Authors and Affiliations

  1. 1.Key Laboratory of Pressure Systems and Safety (MOE), School of Mechanical and Power EngineeringEast China University of Science and TechnologyShanghaiPeople’s Republic of China
  2. 2.Materials Program, Department of Chemical and Materials EngineeringUniversity of KentuckyLexingtonUSA

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