White light emitting phosphor blend for LED devices
AssigneeGeneral Electric Company
InventorsAlok Mani Srivastava, Holly Ann Comanzo
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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, (Sr0.90-0.99Eu0.01-0.1)4Al14O25. A human observer perceives the combination of the orange and the blue-green phosphor emissions as white light.
Claims14
A white light illumination system comprising:
- a radiation source;
- a first luminescent material having a peak emission wavelength of about 570 to about 620 nm, the first luminescent material comprising a first APO:Eu2+,Mn2+ phosphor;
- 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,
- wherein A comprises at least one of Sr, Ca, Ba or Mg.
A white light illumination system comprising:
- a light emitting diode having a peak emission wavelength between 370 and 405 nm;
- a first APO:Eu2+,Mn2+ phosphor, where A comprises at least one of Sr, Ca, Ba or Mg;
- and
- a second phosphor selected from at least one of:
- a) A4D14O25:Eu2+, where A comprises at least one of Sr, Ca, Ba or Mg, and D comprises at least one of Al or Ga;
- b) (2AO*0.84P2O5*0.16B2O3):
- Eu2+, where A comprises at least one of Sr, Ca, Ba or Mg;
- c) AD8O13:Eu2+, where A comprises at least one of Sr, Ca, Ba or Mg, and D comprises at least one of Al or Ga;
- d) A10(PO4)6Cl2:Eu2+, where A comprises at least one of Sr, Ca, Ba or Mg;
- or
- e) A2Si3O8*2ACl2:Eu2+, where A comprises at least one of Sr, Ca, Ba or Mg.
Dependencies are inferred from the claim text.