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Related Experiment Videos

Luminescence studies on RbI:Tb3+ crystals.

P K Manimozhi1, G Muralidharan

  • 1Department of Physics, Gandhigram Rural University, Gandhigram 624 302, Tamilnadu, India.

Luminescence : the Journal of Biological and Chemical Luminescence
|July 5, 2007
PubMed
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This study investigates gamma-irradiated RbI:Tb(3+) crystals, revealing terbium ion involvement in defect creation. Thermoluminescence (TL) and photostimulated luminescence (PSL) confirm Z(3) centers and defect recombination processes.

Area of Science:

  • Solid State Physics
  • Luminescence Studies
  • Defect Chemistry

Background:

  • Rare-earth doped alkali halides are crucial for luminescence applications.
  • Understanding defect formation and recombination kinetics is key to optimizing material properties.
  • Terbium-doped rubidium iodide (RbI:Tb(3+)) presents a promising system for luminescence research.

Purpose of the Study:

  • To investigate the optical absorption, photoluminescence (PL), thermoluminescence (TL), and photostimulated luminescence (PSL) of gamma-irradiated RbI:Tb(3+) crystals.
  • To identify and characterize the defects formed upon irradiation.
  • To elucidate the role of Tb(3+) ions in defect production and recombination processes.

Main Methods:

  • Gamma irradiation of RbI:Tb(3+) crystals.

Related Experiment Videos

  • Optical absorption spectroscopy.
  • Photoluminescence (PL) spectroscopy.
  • Thermoluminescence (TL) measurements.
  • Photostimulated luminescence (PSL) measurements.
  • F-bleaching techniques.

    • Main Results:

    • PL spectra show characteristic Tb(3+) emissions from (5)D(3) and (5)D(4) levels.
    • Gamma irradiation creates defects, including Z(3) centers observed after F-bleaching.
    • TL glow curves indicate a two-step defect annihilation process.
    • Tb(3+) ions participate in defect production and recombination, evidenced by emissions during photostimulation and TL.
    • Trap parameters for the TL process were calculated, with the low-temperature peak attributed to Z(3) centers.

    Conclusions:

    • Tb(3+) ions play an active role in defect formation and recombination in gamma-irradiated RbI.
    • The observed Z(3) centers and the two-step TL process are significant findings for understanding defect dynamics.
    • RbI:Tb(3+) crystals exhibit complex luminescence and defect behaviors influenced by irradiation and dopant ions.