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Optica Publishing Group
  • Applied Spectroscopy
  • Vol. 77,
  • Issue 12,
  • pp. 1344-1350
  • (2023)

Thermal Effects in Up-Conversion Luminescence NaYF4: Tm3+, Yb3+ Core-Shell Nanoparticles in the Temperature Range of 18–312 K

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Abstract

This work demonstrates the temperature (18–312 K) impact on Tm3+ up-conversion luminescence in core-shell structured NaYF4:Tm3+, Yb3+ nanoparticles excited at 976 nm. As the temperature decreases from room temperature to 18 K, Tm3+ up-conversion luminescence bands intensities greatly increase, an average of 60-fold, emitting intense blue and ultraviolet radiation. Tm3+ up-conversion luminescence spectra measurements at different temperatures reveal that three thermal quenching mechanisms are responsible for observed variations in Tm3+ up-conversion luminescence spectra. These three quenching mechanisms are related to the excitation radiation absorption, Stark sublevel population, and energy transfer from Yb3+ to Tm3+.

© 2023 The Author(s)

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