Light emitting device, and lighting system, image display using the same
US8427044B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 28, 2011 |
| Grant date | Apr 23, 2013 |
| Priority date | — |
| Expiry date | Mar 28, 2031 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01L2224/48247
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
To enhance luminance and color rendering of a light emitting device comprising phosphors as wavelength converting material andat least one semiconductor light emitting device that emits visible light, as said phosphors, are used phosphors which are one or more kinds of phosphors selected from a group consisting of oxides, oxynitrides and nitrides, and are a mixture consisting of two or more kinds of phosphors whose luminous efficiency is 35% or higher when excited by the visible light from said semiconductor light emitting device at room temperature. In addition, said mixture contains a first phosphor, and a second phosphor that is different from said first phosphor and capable of absorbing emitted light from said first phosphor, and said first phosphor is contained 85 weight % or more of said mixture of phosphors.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.