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29 June 2001 Synthesis of europium- or terbium-activated calcium tungstate phosphors
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Proceedings Volume 4430, ROMOPTO 2000: Sixth Conference on Optics; (2001)
Event: ROMOPTO 2000: Sixth Conference on Optics, 2000, Bucharest, Romania
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.
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Flavia Forgaciu, Elisabeth-Jeanne Popovici, Laura Ungur, Maria Vadan, Marilena Vasilescu, and Mihail Nazarov "Synthesis of europium- or terbium-activated calcium tungstate phosphors", Proc. SPIE 4430, ROMOPTO 2000: Sixth Conference on Optics, (29 June 2001);

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