Method for making moisture insensitive zinc sulfide based luminescent materials
US5080928A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 5, 1990 |
| Grant date | Jan 14, 1992 |
| Priority date | — |
| Expiry date | Oct 5, 2010 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC09K11/584
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
A process is disclosed for coating phosphors with hydrolyzed alkylaluminum. The hydrolyzed alkylaluminum coating renders the phosphors insensitive to atmospheric moisture. the coating process involves vaporizing an aluminum-containing precursor such as trimethylaluminum or triethylaluminum in an inert gas stream and passing this through a fluidized bed containing the phosphor particles. Water vapor is also passed through the fluidized bed and the water and aluminum precursor react on the surface of the phosphor particles to form hydrolyzed trimethylaluminum or other alkylaluminum. The hydrolyzed trimethylaluminum or other alkylaluminum phosphors are particularly useful in electroluminescent lamps.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.