Method for preparing zinc sulfide based phosphor having effective emission at low voltages
US6641756B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | May 10, 2001 |
| Grant date | Nov 4, 2003 |
| Priority date | — |
| Expiry date | May 10, 2021 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC09K11/565
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
A method for preparing a zinc sulfide phosphor having effective emission at low voltages. In the method for synthesizing a green-light emitting zinc sulfide based phosphor, ZnS:Cu, Al, which is applicable to a device operated with a low voltage, novel raw materials are employed. CuI is used as an activator, wherein monovalent copper (Cu1+) is complexed with ammonia and the ammonia complex is incorporated so as to uniformly distribute the activator in the mixture of raw materials. AlF3 is used as a co-activator, and, ZnI2 and NaI are added as iodide series fluxes. Thus, the color display characteristics are improved with a relatively high color purity and luminance.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.