Light emitting diode device
US8492778B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 19, 2012 |
| Grant date | Jul 23, 2013 |
| Priority date | — |
| Expiry date | Mar 19, 2032 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH10H20/8515
- WIPO fieldSemiconductors
- WIPO sectorElectrical engineering
Abstract
A light emitting diode (LED) device includes a substrate, first and second LED chips arranged on the substrate, and a phosphor layer over the first and second LED chips. The phosphor layer includes a plurality of phosphor units, each including a phosphor particle and a silver halide layer encapsulating the phosphor particle. Light emitted from the second LED chip strikes the phosphor particles to generate a first light, which. combines with the light to generate a resultant light. The silver halide layer is reduced by the light from the first LED chip to produce silver particles around the phosphor particles. The silver particles can block the light emitted from the second LED chip from sticking the phosphor particles. By adjusting the current supplied to the first LED chip, the color temperature of the resultant light generated by the LED device can be changed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.