Single phosphor for creating white light with high luminosity and high CRI in a UV led device
AssigneeGeneral Electric Company
InventorsAlok Mani Srivastava, Anil Raj Duggal, Holly Ann Comanzo, William Winder Beers
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Abstract
There is provided a white light illumination system. The illumination system includes a radiation source which emits either ultra-violet (UV) or x-ray radiation. The illumination system also includes a luminescent material which absorbs the UV or x-ray radiation and emits the white light. The luminescent material has composition A2−2xNa1+xExD2V3O12. A may be calcium, barium, strontium, or combinations of these three elements. E may be europium, dysprosium, samarium, thulium, or erbium, or combinations thereof. D may be magnesium or zinc, or combinations thereof. The value of x ranges from 0.01 to 0.3, inclusive.
Claims24
An illumination system comprising:
- a radiation source which emits ultra-violet (UV) or x-ray radiation;
- and
- a luminescent material absorbing the UV or x-ray radiation from the radiation source and emitting visible light, where the luminecent material comprises a composition of matter comprising A2−2xNa1+xExD2V3O12
- wherein A comprises at least one of calcium, barium, and strontium;
- E comprises at least one of europium, dysprosium, samarium, thulium, and erbium;
- D comprises at least one of magnesium and zinc;
- and
- 0.01≦×≦0.3.
A method for converting ultra-violet (UV) or x-ray exciting radiation to visible light comprising:
- directing the exciting radiation from a radiation source to a luminescent material, wherein the luminescent material thereby emits visible light;
- and
- wherein the luminescent material comprises a composition comprising A2−2xNa1+xExD2V3O12
- wherein A comprises at least one of calcium, barium, strontium;
- E comprises at least one of europium, dysprosium, samarium, thulium, and erbium;
- D comprises at least one of magnesium and zinc;
- and
- 0.01≦×≦0.3.
A method for converting UV or x-ray radiation to white light comprising:
- directing the UV or x-ray exciting radiation from a radiation source to a single luminescent material;
- and
- emitting white light from the single luminescent material;
- wherein the single luminescent material comprises a phosphor composition comprising A2−2xNa1+xExD2V3O12
- wherein A comprises at least one of calcium, barium, strontium;
- E comprises at least one of europium, dysprosium, samarium, thulium, and erbium;
- D comprises at least one of magnesium and zinc;
- and
- 0.01≦×≦0.3;
- and
- wherein the radiation source is an InGaN light emitting diode (LED).
Dependencies are inferred from the claim text.