Titanium-activated lanthanum oxysulfide phosphor and method of preparing same
US3948798A · kind A · utility
4Cited by
2References
8Claims
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Key dates
| Filing date | Dec 23, 1974 |
| Grant date | Apr 6, 1976 |
| Priority date | — |
| Expiry date | Dec 23, 1994 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC09K11/7701
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
An orange broad-band emitting phosphor is a titanium-activated lanthanum oxysulfide containing up to about 0.05 moles of titanium per mole of lanthanum oxysulfide host. The phosphor is prepared by incorporating titanium oxide in the desired ratio to lanthanum into the mixture at the time the lanthanum is sulfurized in the presence of an alkali metal carbonate, to form lanthanum oxysulfide.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.