Light emitting device and a lighting apparatus
US7564065B2 · kind B2 · utility
Assignees
Inventors
Key dates
| Filing date | Mar 22, 2005 |
| Grant date | Jul 21, 2009 |
| Priority date | — |
| Expiry date | Jan 26, 2027 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH10H20/8513
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
The present invention provides in one embodiment a light emitting device that has a high efficacy even in a range of low color temperatures, a long-term reliability, and an improved color rendering property. In addition, the present invention provides in another embodiment a lighting apparatus using such a light emitting device. In the light emitting device, a mixture of a first phosphor material that emits yellow green, yellow or yellow orange light and a second phosphor material that emits light having a longer wavelength than the first phosphor material, for example, yellow orange or orange light is used as a phosphor. The first phosphor material is represented by a general formula Cax(Si, Al)12(O, N)16:Euy2+ and a main phase thereof has an alpha-SiAlON crystal structure.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.