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TL and PL studies on defect-assisted green luminescence from doped strontium sulfide phosphor

Authors
Journal
Journal of Luminescence
0022-2313
Publisher
Elsevier
Publication Date
Volume
128
Issue
10
Identifiers
DOI: 10.1016/j.jlumin.2008.03.002
Keywords
  • Kinetic Parameters
  • Thermoluminescence
  • Strontium Sulfide Phosphor
  • Photoluminescence

Abstract

Abstract Defect-assisted luminescence of Pr 3+-doped SrS has been investigated and reported in this paper. The polycrystalline sample of phosphor was prepared by conventional solid-state reaction method and checked for crystallization and phase by X-ray diffraction study. The thermally stimulated luminescence studies of the phosphor samples with various activator concentrations, irradiated by a blacklight source, are conducted and show a broad single peak around 365–382 K. Computerized glow curve deconvolution tool is used to evaluate the effective trapping parameters and suggests quasi-continuous distribution of traps in the range of 0.5−0.9 eV. A critical survey on the application of first-order kinetics in the present phosphor is undertaken. Photoluminescence studies reveal three excitation bands at 287, 314, 355 nm and defect-related emission at 517, 494 nm for two concentrations of activator atoms in the present phosphor. The 314–355 nm broad excitation bands correspond to a charge transfer transition of Pr 3+-S 2−.

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