Electroluminescent phosphor and its production method
US7135130B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 10, 2004 |
| Grant date | Nov 14, 2006 |
| Priority date | — |
| Expiry date | Feb 10, 2024 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC09K11/576
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
The invention provides electroluminescent phosphor having superior luminance and a long life. The host material is ZnS.aAO, of which “A” is at least one element selected from among magnesium (Mg), calcium (Ca), strontium (Sr), and barium (Ba). “a” ranges from 0.001 to 0.01. Either one of or both copper (Cu) or manganese (Mn) is contained as an activator. At least one element selected from among chlorine (Cl), bromine (Br), iodine (I), and aluminum (Al) is contained as a co-activator. The luminance and life span of the electroluminescent phosphor can be increased by limiting “a”, which represents the proportion of alkaline earth metal oxide (AO) introduced into the zinc sulfide, within the range of 0.001 to 0.01.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.