| abstract |
There is provided a white light illumination system including a radiation source, a first luminescent material having a peak emission wavelength of about 570 to about 620 nm, and a second luminescent material having a peak emission wavelength of about 480 to about 500 nm, which is different from the first luminescent material. The LED may be a UV LED and the luminescent materials may be a blend of two phosphors. The first phosphor may be an orange emitting Eu 2+ , Mn 2+ doped strontium pyrophosphate, (Sr 0.8 Eu 0.1 Mn 0.1 ) 2 P 2 O 7 . The second phosphor may be a blue-green emitting Eu 2+ doped SAE, (Sr 0.90-0.99 Eu 0.01-0.1 ) 4 Al 14 O 25 . A human observer perceives the combination of the orange and the blue-green phosphor emissions as white light. |