Red pigment-coated phosphor and method of producing the same
US4209567A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 16, 1978 |
| Grant date | Jun 24, 1980 |
| Priority date | — |
| Expiry date | Nov 16, 1998 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/2991
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
A red emitting phosphor having a low luminous reflectance, comprising a rare earth element-based phosphor body activated by europium and a red pigment coated on the phosphor body, is disclosed, the pigment being formed of indium sulfide or of a combination of indium sulfide and an alkali metal sulfate. The phosphor is produced by coating the phosphor body with a complex compound containing of indium sulfide and an alkali metal sulfide, followed by baking in an oxygen containing atmosphere at 400.degree. to 600.degree. C. so as to convert the complex compound into a red pigment consisting of indium sulfide and an alkali metal sulfate.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.