Red phosphor, method for producing red phosphor, white light source, illuminating device, and liquid crystal display device
US8808578B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 28, 2011 |
| Grant date | Aug 19, 2014 |
| Priority date | — |
| Expiry date | Mar 8, 2032 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02B20/00
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
A red phosphor of high efficiency and a method for producing it are provided. A white light source and an illumination device that allow illumination with the pure white color using the red phosphor are also provided. In addition, a liquid crystal display device using the red phosphor and exhibiting good color reproducing performance is provided. The red phosphor contains an element A, europium (Eu), silicon (Si), carbon (C), oxygen (O) and nitrogen (N) in the ratios of the numbers of atoms of the following compositional formula (1):[Chemical Formula 1][A(m-x)Eux][Si(9-y)Cy]OnN[12-2(n-m)/3] compositional formula (1)where the element A is at least one of magnesium (Mg), calcium (Ca), strontium (Sr) and barium (Ba), and where m, x and n in the compositional formula (1) satisfy the relationships of 3<m<5, 0<x<1, 0<y<2 and 0<n<10 (FIG. 5A).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.