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Updated: Jul 16, 2026

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Frequency upconversion in Pr3+-Li2O-TeO2 binary glass by decay curve analysis.

Vineet Kumar Rai1, S B Rai

  • 1Department of Physics, Laser and Spectroscopy Laboratory, Banaras Hindu University, Varanasi, India. vineetkrrai@yahoo.co.in

Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
|March 1, 2007
PubMed
Summary

This study analyzes frequency upconversion luminescence using near-infrared lasers. Researchers observed similar decay patterns for both anti-Stokes and Stokes emissions, indicating no excited-state absorption. Covalency and bonding parameters were also determined.

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Area of Science:

  • Luminescence and Spectroscopy
  • Materials Science

Background:

  • Frequency upconversion is a process where lower energy photons are converted to higher energy photons.
  • Understanding luminescence decay dynamics is crucial for characterizing materials and their optical properties.

Purpose of the Study:

  • To investigate frequency upconversion luminescence under continuous wave near-infrared laser excitation.
  • To analyze the decay curves of anti-Stokes and Stokes emissions.
  • To determine covalency, bonding parameters, and the nephelauxetic effect in the studied system.

Main Methods:

  • Utilized decay curve analysis of luminescence.
  • Employed continuous wave near-infrared (NIR) laser radiation (approximately 890 nm) for excitation.
  • Performed non-resonant excitation at energies higher than the 1G4 level.

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Published on: June 7, 2018

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Main Results:

  • Observed frequency upconversion luminescence under NIR laser excitation.
  • Demonstrated that the decay curve of anti-Stokes emission (3P0-->3H4) mirrors that of Stokes emission (3P0-->3H4).
  • Found no evidence of a rise time in the anti-Stokes emission decay, suggesting the absence of excited-state anti-Stokes absorption assisted by phonon emission.

Conclusions:

  • The luminescence decay dynamics are consistent for both Stokes and anti-Stokes emissions.
  • The results indicate that excited-state anti-Stokes absorption assisted by phonon emission is not a significant mechanism in this system.
  • Covalency, bonding parameters, and the nephelauxetic effect were successfully determined for the material.