Method of manufacturing fluorescent material
US6143201A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Oct 27, 1998 |
| Grant date | Nov 7, 2000 |
| Priority date | — |
| Expiry date | Oct 27, 2018 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC09K11/08
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
In the production of a fluorescent material, firstly a particle growth retardant is mixed with a fluorescent raw material and then the mixture is baked, whereupon the baked mixture is washed and dried as an intermediate fluorescent material. Then, the particle growth retardant is removed from the surface of the intermediate fluorescent material and crystal defects are formed in the particle-growth-retardant-free intermediate fluorescent material using a ball mill or an ultrasonic vibrator, etc. Finally, the resulting intermediate fluorescent material is baked again and is then washed and dried as a final fluorescent material. This fluorescent material is particularly useful when used in a scatter electroluminescent panel serving as a back light of a liquid crystal display, which must be very small in thickness and light in weight.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.