White light emitting phosphor blend for LED devices
First Claim
1. A white light illumination system comprising:
- a radiation source; and
a radiation-to-light converter consisting essentially of;
a first luminescent material having a peak emission wavelength of about 590 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.
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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
16 Claims
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1. A white light illumination system comprising:
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a radiation source; and a radiation-to-light converter consisting essentially of; a first luminescent material having a peak emission wavelength of about 590 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. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A white light illumination system comprising:
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a radiation source; and a radiation-to-light conversion material which absorbs radiation from the radiation source and produces white light, consisting essentially of; an orange light emitting phosphor; and a blue-green light emitting phosphor. - View Dependent Claims (9, 10, 11, 12)
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13. A white light illumination system consisting essentially of:
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an orange light emitting phosphor; and a blue-green light emitting phosphor; and wherein the orange light emitting phosphor and the blue-green light emitting phosphor are arranged to be excited, via the absorption of radiation from an ultraviolet radiation source, to produce orange light and blue-green light which blend to appear as white light to a human observer. - View Dependent Claims (14, 15, 16)
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Specification