Pre-water-based suspension phosphor treatment process
US4803400A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 2, 1987 |
| Grant date | Feb 7, 1989 |
| Priority date | — |
| Expiry date | Feb 2, 2007 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01J61/44
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
A method for eliminating carbonaceous contaminants and preventing the hydration/solubilization of the oxide coating of a phosphor is described. The method involves the annealing of the oxide coated phosphor at a temperature and for a period sufficient to preclude adversely affecting the protective oxide coating on the phosphor during subsequent water-based suspension processing without detrimentally altering the phosphor. After annealing the phosphor is cooled and then added to a water-based suspension. The optimum conditions for annealing a manganese activated zinc silicate phosphor or a calcium halophosphate phosphor having a protective aluminum oxide coating are the combination of a temperature between about 700.degree. C. and about 850.degree. C. and for a period of time from about 15 minutes to about 20 hours.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.