White lighting device
US8723412B2 · kind B2 · utility
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2References
10Claims
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Key dates
| Filing date | Sep 11, 2012 |
| Grant date | May 13, 2014 |
| Priority date | — |
| Expiry date | Oct 24, 2032 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02B20/00
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
According to the embodiment, a white lighting device includes a semiconductor light-emitting element emitting near-ultraviolet light, and a phosphor layer containing at least a blue-green phosphor emitting blue-green light and a red phosphor emitting red light and emits white light having a correlated color temperature of 5000 K or less and a deviation duv from a blackbody locus of not less than −0.01 nor more than 0.01, in which a ratio of a content of the red phosphor to a content of the blue-green phosphor in the phosphor layer by mass is not less than 35 nor more than 50.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.