Compositions comprising high light-output yellow phosphors and their methods of preparation
US7399428B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 18, 2005 |
| Grant date | Jul 15, 2008 |
| Priority date | — |
| Expiry date | Feb 18, 2025 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG21K4/00
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
Embodiments of the present invention are directed to compositions and processing methods of rare-earth vanadate based materials that have high emission efficiency in a wavelength range of 480 to 700 nm with the maximum intensity at 535 nm (bright yellow) under UV, X-ray and other forms of high-energy irradiation. Embodiments of the present invention are directed to general chemical compositions of the form (Gd1-xAx)(V1-yBy)(O4-zCz), where A is selected from the group consisting of Bi, Tl, Y, La, Ce, Pr, Nd, Pm, Sm, Eu, Tb, Dy, Ho, Er, Tm, Yb, and Lu for 0<x<0.2; B is Ta, Nb, W, and Mo for 0<y<0.1; and C is N, F, Br, and I for 0<z<0.1. Methods of preparation include sol gel, liquid flux, and co-precipitation processes.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.