High CRI lighting device with added long-wavelength blue color
US8508127B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 9, 2010 |
| Grant date | Aug 13, 2013 |
| Priority date | — |
| Expiry date | Nov 15, 2030 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01L2924/0002
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
Solid state lighting devices include least one solid state emitter and multiple lumiphors, arranged to output aggregated emissions that include at least one short wavelength blue peak, at least one long wavelength blue (LWB) peak, at least one yellow and/or green peak, and at least one red and/or orange peak. Presence of long wavelength blue enhances color rendering. At least one solid state emitter may include a short wavelength blue LED, LWB LED, and/or UV LED. Multiple emitters may be provided. Resulting devices may provide CRI greater than 85, efficiency of greater than 50 lm/watt, and color stability in a range of Δu′v′≦0.008 over a temperature change of 75° C.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.