WHITE LIGHT EMITTING PHOSPHOR BLEND FOR LED DEVICES
First Claim
1. A method of making a white light illumination system, comprising:
- blending a first phosphor powder having a peak emission wavelength of about 570 to about 620 nm and a second phosphor powder having a peak emission wavelength of about 480 to about 500 nm to form a mixture; and
placing the mixture into the white light illumination system adjacent to a light emitting diode.
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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 Eu2+, Mn2+ doped strontium pyrophosphate, (Sr0.8Eu0.1Mn0.1)2P2O7. The second phosphor may be a blue-green emitting Eu2+ doped SAE, (Sr0.90-0.99 Eu0.01-0.1)4Al14O25. A human observer perceives the combination of the orange and the blue-green phosphor emissions as white light.
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Citations
26 Claims
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1. A method of making a white light illumination system, comprising:
- blending a first phosphor powder having a peak emission wavelength of about 570 to about 620 nm and a second phosphor powder having a peak emission wavelength of about 480 to about 500 nm to form a mixture; and
placing the mixture into the white light illumination system adjacent to a light emitting diode. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 19, 21, 22, 23)
- blending a first phosphor powder having a peak emission wavelength of about 570 to about 620 nm and a second phosphor powder having a peak emission wavelength of about 480 to about 500 nm to form a mixture; and
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11. A white light illumination system, comprising
a first phosphor powder having a peak emission wavelength of about 570 to about 620 nm; -
a second phosphor powder having a peak emission wavelength of about 480 to about 500 nm and a light emitting diode. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 20, 24, 25, 26)
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Specification