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Photoluminescence: Applications01:14

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Photoluminescence offers a wide range of applications due to its inherent sensitivity and selectivity. This technique allows for both direct and indirect analyses of the analyte. Direct quantitative analysis is possible when the analyte exhibits a favorable quantum yield for fluorescence or phosphorescence. However, an indirect analysis may be feasible if the analyte is not fluorescent or phosphorescent, or if the quantum yield is unfavorable. Indirect methods include reacting the analyte with...
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A vanadate-based white light emitting luminescent material for temperature sensing.

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Researchers developed novel calcium magnesium vanadate-europium vanadate powders. These materials exhibit tunable luminescence for potential use in optical sensing applications.

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Area of Science:

  • Materials Science
  • Solid-State Chemistry
  • Luminescence

Background:

  • Vanadate materials doped with rare-earth ions are investigated for their luminescent properties.
  • Europium (Eu3+) ions are known for their sharp emission lines, useful in various optical applications.
  • Controlling luminescence through material composition and external stimuli is crucial for advanced applications.

Purpose of the Study:

  • To synthesize and characterize calcium magnesium vanadate-europium vanadate powders.
  • To investigate the luminescence properties, including energy transfer mechanisms.
  • To explore the potential of these materials as luminescent thermometers.

Main Methods:

  • Sol-gel method for powder synthesis.
  • Sintering process for material consolidation.
  • Photoluminescence spectroscopy under UV excitation to analyze emission spectra and temperature-dependent behavior.

Main Results:

  • Homogeneous calcium magnesium vanadate-europium vanadate powders were successfully prepared.
  • Broadband emission at 520 nm (VO4 tetrahedra) and sharp emission at 617 nm (Eu3+) were observed.
  • Tunable emission color, including white light at 15% Eu concentration, was achieved.
  • Energy transfer between vanadate and Eu ions was confirmed.
  • A linear decrease in the intensity ratio of broadband to sharp emission with increasing temperature was observed.
  • A maximum relative sensitivity of 1.83% K-1 was obtained for the luminescent thermometer at 455 K.

Conclusions:

  • The synthesized powders exhibit dual emission characteristics with efficient energy transfer.
  • The material's luminescence can be tuned by Eu concentration and temperature, enabling white light emission.
  • The temperature-dependent luminescence intensity ratio allows for the development of a sensitive luminescent thermometer.