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Proceedings Paper

Heat treatments of Gd2O2S:Tb, Y2O2S:Tb phosphors
Author(s): Boris V. Mikhitaryan; Oshir Y. Manashirov; Sergey B. Mikhrin
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Paper Abstract

It's well known, that some heat treatments improve significantly the light yield of Gd2O2S:Tb, Y202S:Tb phosphors, but processes ofthe energy transfer at excitations need further investigations. We present the new results ofthe synthesis and heat treatments optimization of oxysulfide phosphors. The heat treatments curried out at different ambient atmospheres in temperature range 200-1000°C. To measure kinetic properties of defects formations/annealing at heat treatments we measured the dependencies ofrelative defect concentrations on the duration of isothermal annealing. The investigation of bulk and surface defects in phosphors before and after heat treatments carried out at different excitation with different methods: spectra measurements with direct Tb3+ center excitation (4.9 eV UV excitation), spectra measurements with above gap excitation (X-ray; 1 kV and 10 kV electrons, 8.4 eV VUV excitation), thermo-stimulated luminescence measurements. The results of investigations allow us to increase the light yield of phosphors (20% increase in comparison with commercial samples).

Paper Details

Date Published: 10 April 2007
PDF: 4 pages
Proc. SPIE 6597, Nanodesign, Technology, and Computer Simulations, 65970K (10 April 2007); doi: 10.1117/12.726754
Show Author Affiliations
Boris V. Mikhitaryan, North Caucasian State Technical Univ. (Russia)
Oshir Y. Manashirov, SPF Luminophor (Russia)
Sergey B. Mikhrin, St. Petersburg State Polytechnical Univ. (Russia)

Published in SPIE Proceedings Vol. 6597:
Nanodesign, Technology, and Computer Simulations

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