High color rendering light emitting device including different phosphors
US9455380B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 12, 2015 |
| Grant date | Sep 27, 2016 |
| Priority date | — |
| Expiry date | Feb 12, 2035 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH10H20/8514
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
A light emitting device is provided. The light emitting device includes a blue light emitting diode (LED); and phosphors including first to third phosphors, wherein the first phosphor is excited by light emitted from the blue LED, emits light having a main wavelength of about 495 nm to about 510 nm, and includes BaSi2O2N2:Eu or (Bax,Sr1-x)Si2O2N2:Eu where 0<x<1, the second phosphor is excited by light emitted from the blue LED, emits light having a main wavelength of about 555 nm to about 575 nm, and includes Lu3Al5O12:Ce or (Lux,Gd1-x)3Al5O12:Ce where 0<x<1, and the third phosphor is excited by light emitted from the blue LED, emits light having a main wavelength of about 580 nm to about 605 nm, and includes (Cax,Sr1-x)AlSiN3:Eu where 0<x<1.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.