ableTW385063B Title not availableTW507388B Title not availableTW535304B Title not availableWO1997048138A228 May 199718 Dec 1997Philips Electronics NvVisible light emitting devices including uv-light emitting diode and uv-excitable, visible light emitting phosphor, and method of producing such devicesWO2001089000A114 May 200122 Nov 2001Gen ElectricA white light emitting phosphor blend for led devic