Zinc silicate phosphor particles and method for making them
US4440831A · kind A · utility
7Cited by
7References
17Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jun 30, 1981 |
| Grant date | Apr 3, 1984 |
| Priority date | — |
| Expiry date | Jun 30, 2001 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/2993
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
Improved zinc silicate phosphor particles are made by using silicic acid particles in the range from 0.7 to 10 micrometers coated with Mn.sub.2 O.sub.3 .multidot.xH.sub.2 O and then a layer of ZnO particles about an order of magnitude smaller which are fired to form the phosphors. The particle size is held within the range preferred and preferably is even narrower. The particles are not milled or mechanically crushed. Instead, the ZnO powder prevents agglomeration during firing. Baths are provided for formation of the particles prior to firing. Brightness and persistance are improved over conventional phosphors.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.