Enhanced color-preference LED light sources using YAG, nitride, and PFS phosphors
US10833228B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 12, 2019 |
| Grant date | Nov 10, 2020 |
| Priority date | — |
| Expiry date | Aug 12, 2039 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH10H20/8515
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
Aspects of the present disclosure are directed to a composite light source which includes at least one blue light source having peak wavelength in the range of about 400 nm to about 460 nm; at least one yellow-green garnet phosphor; and at least one narrow-band red-emitting down-converter. Such composite light source may have a Lighting Preference Index (LPI) of at least 120. In other aspects the disclosure is directed to composite light source comprising at least one blue light source having peak wavelength in the range of about 400 nm to about 460 nm; at least one yellow-green garnet phosphor; and at least one broad red down-converter. In this latter aspect the composite light source may have a Lighting Preference Index (LPI) of at least 120. Numerous other aspects are provided.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.