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Related Experiment Videos

Low temperature studies in LiF:Mg,Cu,P.

V K Mathur1, P K Bandyopadhyay, J H Barkyoumb

  • 1Naval Surface Warfare Center, Carderock Division, Bethesda, MD 20817, USA. mathurvk@nswccd.navy.mil

Radiation Protection Dosimetry
|October 18, 2002
PubMed
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Investigating LiF:Mg,Cu,P reveals complex emission characteristics. Temperature-dependent X-ray excited fluorescence suggests donor-acceptor pairs may explain the observed luminescence.

Area of Science:

  • Solid State Physics
  • Materials Science
  • Luminescence

Background:

  • The LiF:Mg,Cu,P material is widely investigated for its luminescence properties.
  • The exact nature of the emission centers in LiF:Mg,Cu,P remains unclear.
  • Understanding these centers is crucial for optimizing its applications.

Purpose of the Study:

  • To investigate the X-ray excited emission characteristics of LiF:Mg,Cu,P at different temperatures.
  • To elucidate the nature of the luminescent centers and emission mechanisms.
  • To explore the role of annealing and shallow traps in the material's luminescence.

Main Methods:

  • X-ray excited emission spectroscopy at room temperature and 16 K.
  • Annealing experiments at 573 K for 5 minutes.

Related Experiment Videos

  • Temperature-dependent X-ray excited fluorescence measurements below room temperature.

    • Main Results:

    • At room temperature, a single emission peak at 390 nm was observed.
    • At 16 K, emission spectra resolved into three bands (332 nm, 385 nm, 447 nm).
    • Annealing suppressed the 332 nm emission, enhanced the 447 nm emission, and reduced overall intensity, indicating luminescent center destruction.
    • Shallow traps were identified, correlating with a thermoluminescence peak at 130 K.

    Conclusions:

    • The complex emission in LiF:Mg,Cu,P is likely due to donor-acceptor pair formation.
    • The proposed donor-acceptor complex model helps explain the observed luminescence phenomena.
    • Further investigation into the specific nature of these complexes is warranted.