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

Ying Chen, Weiling Luan, Shaofu Zhang, Fuqian Yang

Research output: Contribution to journalArticlepeer-review

3 Scopus citations

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.

Original languageEnglish
Article number185
JournalJournal of Nanoparticle Research
Volume21
Issue number8
DOIs
StatePublished - Aug 1 2019

Bibliographical note

Funding Information:
W Luan is grateful for the financial support from the National Natural Science Fund of China (51475166).

Publisher Copyright:
© 2019, Springer Nature B.V.

Keywords

  • Heating-cooling
  • Irreversibility
  • PL intensity
  • QDs
  • Temperature sensor
  • Wavelength

ASJC Scopus subject areas

  • Bioengineering
  • Atomic and Molecular Physics, and Optics
  • Chemistry (all)
  • Modeling and Simulation
  • Materials Science (all)
  • Condensed Matter Physics

Fingerprint

Dive into the research topics of 'Quantum-dots based materials for temperature sensing: effect of cyclic heating-cooling on fluorescence'. Together they form a unique fingerprint.

Cite this