The Calcium‐Silicate‐Tungstate Phosphor Preparation and Physical Properties

A typical formulation and method of preparation is given for the calcium‐silicate‐tungstate (CST) phosphor. The wave length of the peak fluorescent emission of the tungstate phase is a function of its lead content. From spectral distribution of the emission of a CST phosphor, one can determine the lead content and the luminous efficiency to be expected from the tungstate phase. The effect of calcium fluoride as a batch addition in increasing average particle diameter of CST phosphor is shown.

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