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Proceedings Paper

Synthesis of europium- or terbium-activated calcium tungstate phosphors
Author(s): Flavia Forgaciu; Elisabeth-Jeanne Popovici; Laura Ungur; Maria Vadan; Marilena Vasilescu; Mihail Nazarov
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Paper Abstract

Utilization of luminescent substances in various optoelectronic devices depends on their luminescent properties and sensitivity to various excitation radiation as well as on particle size distribution and crystalline structure of luminous powders. Calcium tungstate phosphors are well excited with roentgen radiation, so that they are largely used for manufacture of x-ray intensifying screens. Being sensitive to short UV-radiation as well, they could be utilized in Plasma Display Panels or in advertising signs fluorescent tubes. In order to diversify the utilization possibilities of this tungstate class, luminescent powders based on CaWO4:Eu3+ and CaWO4:Tb3+ were synthesized and characterized. As compared with the starting self-activated phosphor, larger excitation wavelength domain and emission colors from blue-to-green-to- yellow-to-red were obtained. The good UV excitability and variable luminescence color recommend these phosphors for optoelectronic device manufacture.

Paper Details

Date Published: 29 June 2001
PDF: 6 pages
Proc. SPIE 4430, ROMOPTO 2000: Sixth Conference on Optics, (29 June 2001); doi: 10.1117/12.432858
Show Author Affiliations
Flavia Forgaciu, Dimitrie Cantemir Ecological Univ. (Romania)
Elisabeth-Jeanne Popovici, Institute of Chemistry (Romania)
Laura Ungur, Institute of Chemistry (Romania)
Maria Vadan, Institute of Chemistry (Romania)
Marilena Vasilescu, Institute of Physical Chemistry (Romania)
Mihail Nazarov, State Univ. of Moldova (Moldova)

Published in SPIE Proceedings Vol. 4430:
ROMOPTO 2000: Sixth Conference on Optics
Valentin I. Vlad, Editor(s)

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