White light emitting phosphor blends for LED devices
First Claim
1. A white light emitting phosphor blend comprising at least three phosphors, wherein the white light emitted by the phosphor blend in response to incident radiation having a peak wavelength between 360 and 420 nm comprises a color temperature between 3000K and 6500K, a CRI above 70 and an efficacy above 200 lm/W;
- wherein the efficacy is above 264 lm/W and the color temperature is between 3300K and 4100K for incident radiation having a peak wavelength between 370 and 405 nm; and
wherein the phosphor blend comprises;
about 55 to about 75 weight percent Sr2P2O7;
Eu2+, Mn2+ phoshor;
about 11 to about 22 weight percent of at least one of (Ba,Sr,Ca)2SiO4;
Eu2+ phosphor; and
about 13 to about 22 weight percent of at least one of (Sr,Ba,Ca,Mg)5(PO4)3Cl;
Eu2+ phosphor.
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Accused Products
Abstract
There is provided white light illumination system including a radiation source, a first luminescent material having a peak emission wavelength of about 575 to about 620 nm, a second luminescent material having a peak emission wavelength of about 495 to about 550 nm, which is different from the first luminescent material and a third luminescent material having a peak emission wavelength of about 420 to about 480 nm, which is different from the first and second luminescent materials. The LED may be a UV LED and the luminescent materials may be a blend of three or four phosphors. The first phosphor may be an orange emitting Eu2+, Mn2+ activated strontium pyrophosphate, Sr2P2O7:Eu2+, Mn2+. The second phosphor may be a blue-green emitting Eu2+ activated barium silicate, (Ba,Sr,Ca)2SiO4:Eu2+. The third phosphor may be a blue emitting SECA phosphor, (Sr,Ba,Ca)5(PO4)3Cl:Eu2+. Optionally, the fourth phosphor may be a red emitting Mn4+ activated magnesium fluorogermanate, 3.5MgO*0.5MgF2*GeO2:Mn4+. A human observer perceives the combination of the orange, blue-green, blue and/or red phosphor emissions as white light.
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Citations
12 Claims
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1. A white light emitting phosphor blend comprising at least three phosphors, wherein the white light emitted by the phosphor blend in response to incident radiation having a peak wavelength between 360 and 420 nm comprises a color temperature between 3000K and 6500K, a CRI above 70 and an efficacy above 200 lm/W;
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wherein the efficacy is above 264 lm/W and the color temperature is between 3300K and 4100K for incident radiation having a peak wavelength between 370 and 405 nm; and
wherein the phosphor blend comprises; about 55 to about 75 weight percent Sr2P2O7;
Eu2+, Mn2+ phoshor;
about 11 to about 22 weight percent of at least one of (Ba,Sr,Ca)2SiO4;
Eu2+ phosphor; and
about 13 to about 22 weight percent of at least one of (Sr,Ba,Ca,Mg)5(PO4)3Cl;
Eu2+ phosphor.- View Dependent Claims (2, 3, 4, 5, 6)
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7. A white light emitting phosphor blend comprising at least three phosphors, wherein the white light emitted by the phosphor blend in response to incident radiation having a peak wavelength between 360 and 420 nm comprises a color temperature between 3000K and 6500K, a CRI above 70 and an efficacy above 200 lm/W;
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wherein the efficacy is above 264 lm/W and the color temperature is between 3300K and 4100K for incident radiation having a peak wavelength between 370 and 405 nm;
wherein the CRI is above 90; and
wherein the phosphor blend comprises; about 11 to about 43 weight percent Sr2P2O7;
Eu2+, Mn2+ phosphor;
about 9 to about 15 weight percent (Ba,Sr,Ca)2SiO4;
Eu2+ phosphor;
about 6 to about 14 weight percent of at least one of(Sr,Ba,Ca,Mg)5(PO4)3Cl;
Eu2+ phosphor; and
about 30 to about 71 weight percent 3.5MgO*0.5MgF2*GeO2;
Mn4+ phosphor.- View Dependent Claims (8, 9, 10, 11)
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12. A white light emitting phosphor blend comprising at least three phosphors, wherein the white light emitted by the phosphor blend in response to incident radiation having a peak wavelength between 360 and 420 nm comprises a color temperature between 3000K and 6500K, a CRI above 70 and an efficacy above 200 lm/W;
- and wherein the phosphor blend comprises;
about 55 to about 75 weight percent Sr2P2O7;
Eu2+, Mn2+ phosphor;
about 11 to about 22 weight percent of at least one of (Ba,Sr,Ca)2SiO4;
Eu2+ phosphor; and
about 13 to about 22 weight percent of at least one of (Sr, Ba,Ca,Mg)5(PO4)3Cl;
Eu2+ phosphor.
- and wherein the phosphor blend comprises;
Specification
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- Resources
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Current AssigneeCurrent Lighting Solutions, LLC (f/k/a GE Lighting Solutions, LLC) (American Industrial Partners)
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Original AssigneeGeneral Electric Company
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InventorsSrivastava, Alok Mani, Comanzo, Holly Ann, McNulty, Thomas Francis
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Primary Examiner(s)KOSLOW, CAROL M
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Application NumberUS10/617,028Publication NumberTime in Patent Office788 DaysField of Search252/301.4 R, 252/301.4 F, 252/301.4 P, 252/301.4 HUS Class Current252/301.40RCPC Class CodesC09K 11/77342 SilicatesH01L 2224/48091 ArchedH01L 2924/00 Indexing scheme for arrange...H01L 2924/00014 the subject-matter covered ...H01L 2924/12044 OLEDH01L 33/504 Elements with two or more w...Y02B 20/00 Energy efficient lighting t...
