Photoluminescent alkaline earth aluminate and method for making the same
US6969475B2 · kind B2 · utility
10Cited by
25References
3Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Nov 19, 2003 |
| Grant date | Nov 29, 2005 |
| Priority date | — |
| Expiry date | Nov 19, 2023 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC09K11/7792
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
A photoluminescent phosphorescent material for emergency lighting and the like. An alkaline earth aluminate base material is alloyed with a lanthamide earth element and a transition metal element. When exposed to ambient lighting, the material of the present invention emits light in dark areas even after the loss of electrical power. The addition of a transition metal element such as Scandium (Sc) provides longer and brighter photoluminescence than is expected by the use of a lanthanide element alone.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.