Abstract
The relation between emission intensity under ultraviolet excitation and Debye-Waller parameter was studied on calcium tungstate phosphors. The samples were prepared by precipitation from aqueous solition of calcium chloride and ammonia-alkaline solution of ammonium paratungstate and by firing at 400°–1000°C in air. The precipitating temperature has a strong influence on the form of precipitated particles, being spherical at 0°C and spindle-shaped at 90°C, and also on the preferred orientation of crystallites in precipitates. The change of emission intensity under ultraviolet excitation with firing temperature shows a correspondence to the change of effective Debye-Waller parameter, B eff, determined from X-ray diffraction intensity measurements. On the ground samples, of which the original is fired at 900°C and has spherical particles, a linear relation was found between the emission intensity under ultraviolet excitation and the dynamic component B d in B eff, which is due to thermal vibration of constituent atoms.
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