Patent · US Expired

White light illumination system with improved color output

US6538371B1 · kind B1 · utility

172Cited by

16References

61Claims

0Family size

Assignee

General Electric Company · US

Inventors

Anil Raj Duggal · Niskayuna, US
Alok Mani Srivastava · San Francisco, US
Holly Ann Comanzo · Niskayuna, US

Key dates

Filing date	Mar 27, 2000
Grant date	Mar 25, 2003
Priority date	—
Expiry date	Mar 27, 2020

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY02B20/00
WIPO fieldBasic materials chemistry
WIPO sectorChemistry

Abstract

There is provided a white light illumination system including a blue LED and a luminescent material. The system color output is improved when a line connecting the LED color coordinates and the luminescent material color coordinates approximates the Black Body Locus on the CIE chromatically diagram. The LED may have a peak emission wavelength between 470 and 500 nm. The luminescent material may be (Y1−x−zGdxCez)3Al5O12, where 0.7>x>0.4 and 0.1>z>0.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.