Electroluminescent phosphor and electroluminescent element therewith
US6702958B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 30, 2001 |
| Grant date | Mar 9, 2004 |
| Priority date | — |
| Expiry date | Dec 7, 2021 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC09K11/584
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
An electroluminescent phosphor includes a phosphor powder that has zinc sulfide as a phosphor host. The phosphor powder has an average particle size, which is expressed by a D(50) value, in the range of 10 &mgr;m or more and 20 &mgr;m or less. In addition, the phosphor powder has a particle size distribution, in which coarser particle component, of which particle size is 31 &mgr;m or more, is 15% by mass or less. An electroluminescent element includes a luminescent layer that includes such electroluminescent phosphor, and of which particle density is heightened on the basis of the average particle size and the particle size distribution of the phosphor powder. A transparent electrode layer is integrally disposed to face one main surface of the luminescent layer, and a rear electrode layer is integrally disposed through a reflective insulating layer on the other main surface. According to such electroluminescent element, brightness may be improved.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.