Zinc silicate phosphor particles and method for making them

Details Zinc silicate phosphor particles and method for making them Zinc silicate phosphor particles and method for making them

C - Chemistry, Metallurgy

09

K

31/121

C09K 11/02 (2006.01) C09K 11/54 (2006.01)

Patent

CA 1184024

YO981-026 IMPROVED ZINC SILICATE PHOSPHOR PARTICLES AND METHOD FOR MAKING THEM ABSTRACT Improved zinc silicate phosphor particles are made by using silicic acid particles in the range from 0.7 to 10 micrometers coated with Mn2O3?xH2O and then a layer of ZnO particles about an order of magnitude smaller which are fired to form the phosphors. The particle size is held within the range preferred and preferably is even narrower. The particles are not milled or mechanically crushed. Instead, the ZnO powder prevents agglomeration during firing. Baths are provided for formation of the particles prior to firing. Brightness and per- sistence are improved over conventional phosphors.

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