Patent ID: 6946785

Claim:
A method for producing coated phosphor particles, comprising: preparing an aqueous dispersion containing fine gold particles; adding a surface-active agent and a hydrophobic organic solvent to the aqueous dispersion of the fine gold particles obtained in the previous step to form reverse micelles of the fine gold particles; adding tetraethoxysilane to the reverse micelles of the fine gold particles, wherein polymerization is carried out to produce a dispersion comprising gold colloid/oxide composite particles; adding an organic or inorganic binder to a suspension of phosphor particles to allow the binder to adhere to surfaces of the phosphor particles; and thereafter adding the dispersion containing the gold colloid/oxide composite particles thereto, and mixing followed by drying to form a thin film containing the gold colloid/oxide composite particles on at least part of the surface of each of the phosphor particles.