Production of substantially monodisperse phosphor particles
US6039894A · kind A · utility
Assignees
Inventors
Key dates
| Filing date | Dec 5, 1997 |
| Grant date | Mar 21, 2000 |
| Priority date | — |
| Expiry date | Dec 5, 2017 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC09K11/0827
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
The invention relates to a method for producing activated, substantially monodisperse, phosphorescent particles and particles formed thereby. The method suspends substantially monodisperse, phosphor-precursor particles in a fluidizing gas and then introduces a reactive gas to contact the suspended phosphor-precursor particles. Heating the suspended phosphor-precursor particles to a reaction temperature then forms unactivated phosphorescent particles. In another embodiment, the phosphor-precursor particles may be heated to a reaction temperature where they decompose to form the unactivated phosphor particles. The unactivated phosphorescent particles suspended within the fluidizing gas are activated by heating the unactivated phosphorescent particles to an activation temperature forming activated, substantially monodisperse, phosphorescent particles.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.