Foley & Lardner
Phosphors for down converting ultraviolet light of LEDs to blue-green light
There is provided a blue-green illumination system, comprising a light emitting diode, and at least one luminescent material having at least two peak emission wavelengths, wherein the emission CIE color coordinates of the at least two peak emission wavelengths are located within an area of a pentagon on a CIE chromaticity diagram, whose corners have the following CIE color coordinates:e) x=0.0137 and y=0.4831;b) x=0.2240 and y=0.3890;c) x=0.2800 and y=0.4500;g) x=0.2879 and y=0.5196; andh) x=0.0108 and y=0.7220.The illumination system may be used as the green light of a traffic signal. The luminescent material may be a blend of (Ba1-xEux)Mg2Al6O27 (&#8220;BAM&#8221;) and (Ba1-xEux)Mg2-yMnyAl16O27 (&#8220;BAMMn&#8221;) phosphors, where 0<x&lE;0.2 and 0<y&lE;0.5.
General Electric Company
H H Y H C
H01L H01L Y10S H01L C09K
additional additional additional inventional inventional
Alok Mani Thomas Francis Holly Ann
Srivastava McNulty Comanzo