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

1981-06-30

1984-04-03

Cannon, J. C.

Surgery

Truss

Pad

2523016F, 427 64, 427 68, C09K 1110, C09K 1116, C09K 1120, H01J 2926

Patent

active

044408315

ABSTRACT:
Improved zinc silicate phosphor particles are made by using silicic acid particles in the range from 0.7 to 10 micrometers coated with Mn.sub.2 O.sub.3 .multidot.xH.sub.2 O 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 persistance are improved over conventional phosphors.

REFERENCES:
patent: 2920003 (1960-01-01), Davis
patent: 3069292 (1962-12-01), Alexander et al.
patent: 3420691 (1969-01-01), Thomas et al.
patent: 3939377 (1976-02-01), Ignasiak
patent: 4172920 (1979-10-01), Konda et al.
patent: 4287229 (1981-09-01), Watanabe et al.
patent: 4339501 (1982-07-01), Inoue et al.

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