| 摘要 |
PROBLEM TO BE SOLVED: To obtain a phosphor capable of preventing the charge-up of electron beams when used in especially a cathode-ray tube and remarkably improving the luminance by sticking a specific amount of fine tin oxide particles to surfaces of phosphor grains. SOLUTION: This phosphor is obtained by sticking fine tin oxide particles (SnO2 ) having <=0.5μm, preferably 0.01-0.1μm particle diameter in an amount of 0.05-0.5wt.% based on the weight of the phosphor grains to surfaces of the phosphor grains. For example, ZnS:Ag, Cl which is a blue light emitting substance or Y2 O2 S:Eu that is a red light emitting phosphor is cited as the phosphor grains. The objective phosphor is obtained by uniformly dispersing the phosphor grains in pure water, then adding the SnO2 particles powder to the resultant dispersion, further adding a polyacrylamide solution as an adhesive for fixing the phosphor grains to the SnO2 particles, stirring the prepared mixture for 1-2hr, then washing the dispersed phosphor grains, subsequently drying the washed grains at 100-200 deg.C and finally sieving the resultant massive phosphor.
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