Process for producing electroluminescent yellow zinc sulfide phosphors
US5009808A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 11, 1990 |
| Grant date | Apr 23, 1991 |
| Priority date | — |
| Expiry date | Jan 11, 2010 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC09K11/612
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
A phosphor composition consisting essentially of particles of zinc sulfide electroluminescent phosphor activated with from about 0.7% by weight of about 1.3% by weight of manganese, based upon the total weight of the phosphor composition, wherein the electroluminescent emission of the phosphor has an x color coordinate value of from about 0.522 to about 0.532 and a y color coordinate value of from about 0.460 to about 0.470 and an efficiency of greater than about 5.6 lumens per watt at 115V/400 Hz. A solid state process for producing the foregoing phosphor comprises a multiple firing in order to incorporate manganese, chloride and copper ions into the zinc sulfide lattice. Controlled levels of manganese yield highly efficient electroluminescent phosphors.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.