23 February 2000 Calcium tungstate phosphors with well-defined particle sizes
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Proceedings Volume 4068, SIOEL '99: Sixth Symposium on Optoelectronics; (2000) https://doi.org/10.1117/12.378657
Event: SIOEL: Sixth Symposium of Optoelectronics, 1999, Bucharest, Romania
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.
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Flavia Forgaciu, Flavia Forgaciu, Elisabeth-Jeanne Popovici, Elisabeth-Jeanne Popovici, Cristina Ciocan, Cristina Ciocan, Laura Ungur, Laura Ungur, Maria Vadan, Maria Vadan, } "Calcium tungstate phosphors with well-defined particle sizes", Proc. SPIE 4068, SIOEL '99: Sixth Symposium on Optoelectronics, (23 February 2000); doi: 10.1117/12.378657; https://doi.org/10.1117/12.378657
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