Nano-YAG:Ce phosphor compositions and their methods of preparation
US8133461B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 18, 2007 |
| Grant date | Mar 13, 2012 |
| Priority date | — |
| Expiry date | Oct 18, 2027 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF21K9/64
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
Disclosed herein are cerium doped, garnet phosphors emitting in the yellow region of the spectrum, and having the general formula (Y,A)3(Al,B)5(O,C)12:Ce3+, where A is Tb, Gd, Sm, La, Sr, Ba, Ca, and/or Mg, and substitutes for Y, B is Si, Ge, B, P, and/or Ga, and substitutes for Al, and C is F, Cl, N, and/or S, where C substitutes for O. Relative to a solid-state-reaction method, the instant co-precipitation methods provide a more homogeneous mixing environment to enhance the distribution of the Ce3+ activator in the YAG matrix. Such a uniform distribution has the benefit of an increased emission intensity. The primary particle size of the as-prepared phosphor is about 200 nm, with a narrow distribution.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.