Phosphorescent phosphor and method of manufacturing thereof
US7422704B2 · kind B2 · utility
2Cited by
2References
7Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Nov 5, 2004 |
| Grant date | Sep 9, 2008 |
| Priority date | — |
| Expiry date | Aug 4, 2025 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC09K11/7792
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
A phosphorescent phosphor having excellent afterglow luminance characteristics, even under low illumination intensity of radiation conditions, compared to conventional strontium aluminate phosphorescent phosphors of the same type, and particularly a phosphorescent phosphor having excellent initial afterglow luminance characteristics and excellent afterglow luminance characteristics at 60 and 90 minutes after cessation of the excitation, with following requirements:0.015<Eu/(Sr+Ba+Eu+Dy)≦0.05, 0.3≦Dy/Eu≦2,0.03≦Ba/(Sr+Ba)≦0.2 and 2.1≦Al/(Sr+Ba+Eu+Dy)≦2.9.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.