Novel phosphor systems for a white light emitting diode (led)

Abstract From the Canadian patent

Novel phosphor systems for a white LED are disclosed. The phosphor systems are excited by a non-visible to near-UV radiation source having an excitation wavelength ranging from about 250 to 420 nm. The phosphor system may comprise one phosphor, two phosphors, and may include optionally a third and even a fourth phosphor. In one embodiment of the present invention the phosphor is a , two phosphor system having a blue phosphor and a yellow phosphor wherein the , long wavelength end of the blue phosphor is substantially the same wavelength as the short wavelength end of the yellow phosphor. Alternatively there may , be a wavelength gap between the yellow and blue phosphors. The yellow …