White light emitting phosphor blend for LED devices

Details White light emitting phosphor blend for LED devices White light emitting phosphor blend for LED devices

2006-03-21

2006-03-21

Whitehead, Jr., Carl (Department: 2813)

Active solid-state devices (e.g., transistors, solid-state diode

Incoherent light emitter structure

In combination with or also constituting light responsive...

Reexamination Certificate

active

07015510

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, (Sr0.90-0.99Eu0.01-0.1)4Al14O25. A human observer perceives the combination of the orange and the blue-green phosphor emissions as white light.

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