White LED lamp and backlight using the same, and liquid crystal display device using the backlight
US7935975B2 · kind B2 · utility
Assignees
Inventors
Key dates
| Filing date | Sep 12, 2006 |
| Grant date | May 3, 2011 |
| Priority date | — |
| Expiry date | May 15, 2027 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02B20/00
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
Disclosed is a white LED lamp using an ultraviolet light emitting LED, which can simultaneously realize a high level of color rendering and a high level of brightness. Included is an LED chip 2 having a luminescence wavelength between 360 nm and 440nm, and a light emitting part excitable upon exposure to light from the LED chip 2 to emit white light and comprising a phosphor, the phosphor including blue, green, and red light emitting phosphors bonded to each other. A phosphor selected from europium-activated halophosphate phosphors and europium-activated aluminate phosphors is used as the blue light emitting phosphor. A gold- and aluminum-activated zinc sulfide phosphor is used as the green light emitting phosphor. A phosphor selected from europium- and samarium-activated lanthanum oxysulfide phosphors and copper- and manganese-activated zinc sulfide phosphors is used as the red light emitting phosphor.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.