Aluminate phosphor containing bivalence metal elements, its preparation and the light emitting devices incorporating the same
US7850869B2 · kind B2 · utility
Assignees
Inventors
Key dates
| Filing date | May 13, 2009 |
| Grant date | Dec 14, 2010 |
| Priority date | — |
| Expiry date | May 13, 2029 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC09K11/778
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
A phosphor can be excited by UV, purple or blue light LED, its production and the light emitting devices. The general formula of the phosphor is LnaMb(O,F)12:(R3+,M′2+)x, wherein, Ln is at least one metal element selected from a group consisting of Sc, Y, La, Pr, Nd, Gd, Ho, Yb and Sm, 2.6≦a≦3.4; M is at least one element selected from a group consisting of B, Al and Ga, 4.5≦b≦5.5; R is at least one metal element selected from a group consisting of Ce and Tb; M′ is at least one metal element selected from a group consisting of Ca, Sr, Ba, Mn and Zn, 0.001≦x≦0.4. The phosphor possesses broad emitting range, high efficiency, better uniformity and stability. A light emitting device can be obtained by incorporating this phosphor into a UV, purple or blue light emitting device.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.