| 摘要 |
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<SUP>2+</SUP>,Mn<SUP>2+</SUP> doped strontium pyrophosphate, (Sr<SUB>0.8</SUB>Eu<SUB>0.1</SUB>Mn<SUB>0.1</SUB>)<SUB>2</SUB>P<SUB>2</SUB>O<SUB>7</SUB>. The second phosphor may be a blue-green emitting Eu<SUP>2+</SUP> doped SAE, (Sr<SUB>0.90-0.99 </SUB>Eu<SUB>0.01-0.1</SUB>)<SUB>4</SUB>Al<SUB>14</SUB>O<SUB>25</SUB>. A human observer perceives the combination of the orange and the blue-green phosphor emissions as white light. |
