Foley & Lardner
Phosphor 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 a luminescent material having emission CIE color coordinates located within an area of a of a pentagon on a CIE chromaticity diagram, whose corners have the following CIE color coordinates:i) x=0.0137 and y=0.4831;ii) x=0.2240 and y=0.3890;iii) x=0.2800 and y=0.4500;iv) x=0.2879 and y=0.5196; andv) x=0.0108 and y=0.7220.The light emitting diode may be a UV LED and the luminescent material may be a Ba2SiO4:Eu2+ phosphor, a Ba2(Mg,Zn)Si2O7:Eu2+ phosphor and/or a Ba2Al2O4:Eu2+ phosphor. The illumination system may be used as the green light of a traffic light or an automotive display.
General Electric Company
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Holly Ann Alok Mani Dan Darcy Thomas Francis
Comanzo Srivastava Doxsee McNulty