Red-emitting nitride-based phosphors
US8663502B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 26, 2013 |
| Grant date | Mar 4, 2014 |
| Priority date | — |
| Expiry date | Apr 26, 2033 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH10H20/8513
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
A red-emitting phosphor comprises a nitride-based composition represented by the chemical formula M(x/v)M′2Si5-xAlxN8:RE, wherein: M is at least one monovalent, divalent or trivalent metal with valence v; M′ is at least one of Mg, Ca, Sr, Ba, and Zn; and RE is at least one of Eu, Ce, Tb, Pr, and Mn; wherein x satisfies 0.1≦x<0.4, and wherein the phosphor has the general crystalline structure M′2Si5N8:RE, Al substitutes for Si within the crystalline structure, and M is located substantially at interstitial sites. Furthermore, the phosphor is configured such that 1,000 hours of aging at 85° C. and 85% humidity results in a deviation in chromaticity coordinates CIE Δx and Δy of less than about 0.03. Furthermore, the phosphor absorbs radiation in the UV and blue and emits light with a photoluminescence peak wavelength within the range from about 620 to 650 nm.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.