| 摘要 |
PROBLEM TO BE SOLVED: To produce a high-quality fluorescent substance, hardly producing a residue in a fluorescent adherend part of a cathode-ray tube and capable of reproducing a highly precise image by sticking a specific amount of alumina particles having a specified particle diameter to surfaces of fluorescent substance grains consisting essentially of zinc sulfide and/or yttrium oxysulfide. SOLUTION: This fluorescent substance is produced by sticking (B) alumina particles having 0.05-2μm average particle diameter in an amount of 0.05-2wt.% based on the weight of (A) fluorescent substance grains consisting essentially of zinc sulfide and/or yttrium oxysulfide to the surfaces of the component A. The objective fluorescent substance is obtained by initially dispersing the component A in pure water, then adding an aqueous solution of zinc sulfate (ZnSO4 ) to the resultant dispersion, stirring the mixture, adding a dispersion of the component B thereto, stirring the mixture dispersion, subsequently regulating the pH to 8-9, thereby depositing zinc hydroxide, simultaneously stirring the mixture, sticking the component B through the zinc hydroxide to the surfaces of the component A and finally filtering the dispersion of the component A to which the component B sticks and drying and sieving the resultant filter cake.
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