Gray body colored zinc sulfide activated with copper
US4681807A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 9, 1985 |
| Grant date | Jul 21, 1987 |
| Priority date | — |
| Expiry date | Jul 9, 2005 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/2991
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
A catholuminescent material consisting essentially of particles of copper-activated zinc sulfide cathodoluminescent phosphor having at least a partial coating of a mixture of a blue pigment of cobalt aluminate and a red pigment of iron oxide wherein the weight ratio of said blue pigment to said red pigment is from about 3.5:1 to about 4.5:1 and the weight percent of said pigments are from about 0.2% to about 2% by weight of catholuminescent phosphor. A process for producing said pigmented phosphor comprises forming the appropriate aqueous slurries by proper pH control and then by the addition of colloidal silica, the pigment is coated onto the phosphor particles.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.