Process for producing phosphor
US5051203A · kind A · utility
2Cited by
2References
9Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Nov 23, 1990 |
| Grant date | Sep 24, 1991 |
| Priority date | — |
| Expiry date | Nov 23, 2010 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC09K11/623
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
A phosphor producing process capable of providing a phosphor of good quality in a reduced period of time. A Li compound acting as a doping agent is added prior to primary calcination so that it may also act as a flux and removed by washing prior to secondary calcination. A ZnO.Ga.sub.2 O.sub.3 solid solution thus obtained is activated in the secondary calcination using an atmosphere in which reducing gas and Zn gas are mixed. Thus, a ZnO.Ga.sub.2 O.sub.3 :Li, P phosphor is which the molar ratio between Zn and Ga.sub.2 O.sub.3 is 1:1 and of which crystals exhibit good surface conditions can be produced in a reduced period of time.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.