Luminescent barium-lithium aluminate phosphors and lamp containing the same
US4110660A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Sep 27, 1976 |
| Grant date | Aug 29, 1978 |
| Priority date | — |
| Expiry date | Sep 27, 1996 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC09K11/7734
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
Luminescent materials having a host of controlled amounts of barium oxide, controlled amounts of lithium oxide, and the balance aluminum oxide when activated by divalent europium alone yield a blue emission when excited by ultraviolet light and activated by europium in combination with divalent manganese yield a bright green emission under ultraviolet light. The host can be a solid solution of the foregoing oxides or it can contain alpha alumina and spinel as additional phases. These materials are used to produce lamps having enhanced emission characteristics as compared to lamps employing luminescent materials having a host of aluminum oxide in combination with barium oxide and activated by europium or europium manganese or to lamps employing magnesium gallate, activated by manganese.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.