Red emitting phosphor for cathode ray tube
US6268691A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 23, 1999 |
| Grant date | Jul 31, 2001 |
| Priority date | — |
| Expiry date | Aug 23, 2019 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01J29/325
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A red emitting phosphor comprises a yttrium oxysulfide phosphor as a base material. A red emitting phosphor of medium particle size type has such a particle size distribution that a content of a component of a particle diameter of less than 4.0 .mu.m is 15% or less, that of a component of a particle diameter of 4.0 .mu.m or more and less than 8.0 .mu.m is 75% or more, and that of a component of a particle diameter of 8.0 .mu.m or more is 10% or less. A red emitting phosphor of larger particle size type has such a particle size distribution that the content of a component of a particle diameter of less than 5.04 .mu.m is 20% or less, that of a component of a particle diameter of 5.04 .mu.m or more and less than 10.079 .mu.m is 70% or more, and that of a component of a particle diameter of 10.079 .mu.m or more is 10% or less. Phosphor layers employing these red emitting phosphors are excellent in denseness. Accordingly, a cathode ray tube of high contrast and high quality can be provided.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.