High color-saturation lighting devices with enhanced long wavelength illumination
US9530944B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | May 1, 2015 |
| Grant date | Dec 27, 2016 |
| Priority date | — |
| Expiry date | May 1, 2035 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01L2924/181
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A lighting device including a blue solid state emitter, at least one yellow-green or green lumiphoric material, and at least one red or red-orange solid state emitter provides high color saturation, preferably in combination with a high R9-prime (modified R9) color rendering value, with such condition(s) being obtainable with at least one of (i) a red emitter peak wavelength of at least 630 nm, (ii) a green lumiphoric material having a narrow peak wavelength, and (iii) a blue shifted green color point within a specified region of a 1931 CIE chromaticity diagram, and obtainable without requiring a notch filtering material. Aggregate emissions may have a CCT in a range of from 2000K to 5000K.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.