Coated LED with improved efficiency
US7479662B2 · kind B2 · utility
188Cited by
13References
30Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Aug 29, 2003 |
| Grant date | Jan 20, 2009 |
| Priority date | — |
| Expiry date | May 21, 2024 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH10H20/84
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
An LED device including an LED chip and a lens positioned apart from the chip and coated with a uniform thickness layer of fluorescent phosphor for converting at least some of the radiation emitted by the chip into visible light. Positioning the phosphor layer away from the LED improves the efficiency of the device and produces more consistent color rendition. The surface area of the lens is preferably at least ten times the surface area of the LED chip. For increased efficiency, the reflector and submount can also be coated with phosphor to further reduce internal absorption.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.