UV/blue LED-phosphor device with short wave pass, long wave pass band pass and peroit filters
US5813752A · kind A · utility
209Cited by
3References
12Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | May 27, 1997 |
| Grant date | Sep 29, 1998 |
| Priority date | — |
| Expiry date | May 27, 2017 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S362/80
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A visible light emitting device for use in lighting and/or display applications includes a UV LED, a phosphor layer on the upper, main light emitting surface of the LED, and a short wave pass (SWP) filter between the LED and the phosphor layer to transmit UV light from the LED to the phosphor layer, as well as to reflect visible light from the phosphor layer in a forward direction, thus enhancing the efficiency of the device. Additional optical filters located on the top of the phosphor layer further enhance efficiency and/or spectral characteristics of the emitted light.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.