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Proceedings Paper

Calcium tungstate phosphors with well-defined particle sizes
Author(s): Flavia Forgaciu; Elisabeth-Jeanne Popovici; Cristina Ciocan; Laura Ungur; Maria Vadan
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Paper Abstract

Under short TJV or roentgen radiation, the self-activated calcium tungstate phosphors (CaWO4:W) exhibit blue luminescence and could be used as luminescent pigments for the manufacture of X-ray intensifying screens and fluorescent lamps for luminous signs. As luminescent pigments, CaWO4:W phosphor has to possess high luminescence characteristics and well defined particle sizes. This study presents the influence of synthesis conditions on morphostructural and luminescent characteristics of CaWO4:W phosphors. Phosphors were prepared by thermal synthesis from mixtures consisting of precipitated CaWO4 and CaCl2 as flux; both reagents were luminescent grade. Calcination was performed at 600-1000 °C for 0.5-2.0 h, in air. The crystalline structure (XRD-patterns), particle size distribution and luminescent characteristics (emission and excitation spectra) ofphosphors were determined and interpreted.

Paper Details

Date Published: 23 February 2000
PDF: 6 pages
Proc. SPIE 4068, SIOEL '99: Sixth Symposium on Optoelectronics, (23 February 2000); doi: 10.1117/12.378657
Show Author Affiliations
Flavia Forgaciu, Institute of Chemistry (Romania)
Elisabeth-Jeanne Popovici, Institute of Chemistry (Romania)
Cristina Ciocan, Institute of Chemistry (Romania)
Laura Ungur, Institute of Chemistry (Romania)
Maria Vadan, Institute of Chemistry (Romania)

Published in SPIE Proceedings Vol. 4068:
SIOEL '99: Sixth Symposium on Optoelectronics
Teodor Necsoiu; Maria Robu; Dan C. Dumitras, Editor(s)

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