White LED, and backlight and liquid crystal display device using the same
US8288937B2 · kind B2 · utility
Assignees
Inventors
Key dates
| Filing date | Nov 30, 2010 |
| Grant date | Oct 16, 2012 |
| Priority date | — |
| Expiry date | Nov 30, 2030 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02B20/00
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
A white LED includes a light emitting element with a light emission peak wavelength equal to or longer than 380 nm and equal to or shorter than 420 nm, and a phosphor layer containing three or more types of phosphors including at least a blue phosphor, a green phosphor, and a red phosphor and disposed in a manner to cover at least part of the light emitting element. The phosphor layer has a first phosphor layer and a second phosphor layer disposed in an opposite side of a side of the light emitting element of the first phosphor layer. In the first phosphor layer, a content of the blue phosphor in an entire phosphor contained in the first phosphor layer is equal to or less than 5 mass %, or the blue phosphor is not contained. In the second phosphor layer, a content of phosphor other than the blue phosphor in an entire phosphor contained in the second phosphor layer is equal to or less than 5 mass %, or no phosphor other than the blue phosphor is contained.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.