Patents by Inventor Emil Vergilov Radkov
Emil Vergilov Radkov has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 9954145Abstract: A lighting apparatus for emitting white light including a semiconductor light source emitting radiation with a peak emission between from about 250 nm to about 500 nm and a first phosphor having a peak emission between about 550 and 615 nm, wherein an overall emission spectrum of the lighting apparatus has a depression between about 550 and 615 nm, whereby the red-green color contrast is increased versus a reference illuminant.Type: GrantFiled: June 4, 2014Date of Patent: April 24, 2018Assignee: GE Lighting Solutions, LLCInventors: Emil Vergilov Radkov, Ilona Elisabeth Hausmann, Derek Allen Publicover
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Publication number: 20140285996Abstract: A lighting apparatus for emitting white light including a semiconductor light source emitting radiation with a peak emission between from about 250 nm to about 500 nm and a first phosphor having a peak emission between about 550 and 615 nm, wherein an overall emission spectrum of the lighting apparatus has a depression between about 550 and 615 nm, whereby the red-green color contrast is increased versus a reference illuminant.Type: ApplicationFiled: June 4, 2014Publication date: September 25, 2014Applicant: GE LIGHTING SOLUTIONS LLCInventors: Emil Vergilov Radkov, Ilona Elisabeth Hausmann, Derek Allen Publicover
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Patent number: 8299701Abstract: Provided are a lighting device, a backlighting device, and a display device that comprise a radiation source such as LED and wavelength converting members comprising phosphors. In one embodiment, self-absorption within the devices is suppressed or reduced by placing a selective reflector between two wavelength converting members, and the wavelength converting member emitting light with longer peak wavelength is substantially isolated from the irradiation of another wavelength converting member emitting light with shorter peak wavelength. In other embodiments, the wavelength converting members are arranged in strip configuration; or in adjacent hexagons configuration.Type: GrantFiled: December 27, 2007Date of Patent: October 30, 2012Assignee: GE Lighting Solutions LLCInventors: Boris Kolodin, Srinath Aanegola, Emil Vergilov Radkov
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Patent number: 7859182Abstract: Light emitting apparatuses including warm white LED based lights including a semiconductor light source and a phosphor material including a yellow emitting phosphor, a red emitting phosphor, and, optionally, at least one of a green, blue or green-blue emitting phosphor.Type: GrantFiled: June 4, 2007Date of Patent: December 28, 2010Assignee: Lumination LLCInventors: Emil Vergilov Radkov, Anant Achyut Setlur, Ilona Elisabeth Hausmann, Marisa L. Goodin, legal representative
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Patent number: 7857994Abstract: Phosphor compositions, blends thereof and light emitting devices including white light emitting LED based devices, and backlights, based on such phosphor compositions. The devices include a light source and a phosphor material as described. Also disclosed are phosphor blends including such a phosphor and devices made therefrom.Type: GrantFiled: May 30, 2007Date of Patent: December 28, 2010Assignee: GE Lighting Solutions, LLCInventors: Anant Achyut Setlur, Oltea Puica Siclovan, Prasanth Kumar Nammalwar, Ramesh Rao Sathyanarayan, Digamber G. Porob, Ramachandran Gopi Chandran, William Jordan Heward, Emil Vergilov Radkov, Linda Jane Valyou Briel
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Patent number: 7847309Abstract: New phosphor materials including a complex fluoride phosphor activated with Mn4+ which may include at least one of (A) A2[MF7]:Mn4+, wherein A=Li, Na, K, Rb, Cs, NH4, or a combination thereof, and M=Nb, Ta or a combination thereof; and (B) A3[XF6]:Mn4+, wherein A=Li, Na, K, Rb, Cs, NH4, or a combination thereof, and X=Sc, Y, La, a lanthanide, Bi, or a combination thereof.Type: GrantFiled: July 16, 2008Date of Patent: December 7, 2010Assignee: GE Lighting Solutions, LLCInventors: Emil Vergilov Radkov, Anant Achyut Setlur, Alok Mani Srivastava, Ljudmil Slavchev Grigorov
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Patent number: 7737457Abstract: There is provided a phosphor down converting element based on fluoropolymer resin and a method for fabricating the same. There is further provided a method for using said phosphor down converting element to generate white light from a radiation source. The method for fabricating phosphor down converting element includes preparing an appropriate phosphor powder mixture that is capable of absorbing a first band of wavelengths and emitting a second band of wavelengths being greater in length than the first bands, incorporating the phosphor powder mixture into or on a phosphor carrier element comprising a fluoropolymer material, and molding the phosphor down converting elements into useful shapes. Fluoropolymers are the most chemically inert of all plastics, can withstand both extremely high and low temperatures, and show a resistance to weavering and UV degradation, making fluoropolymers optimal for use as a phosphor carrier.Type: GrantFiled: September 27, 2007Date of Patent: June 15, 2010Assignee: Lumination LLCInventors: Boris Kolodin, Emil Vergilov Radkov
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Patent number: 7648649Abstract: Light emitting devices including backlights having a light source and a phosphor material including a complex fluoride phosphor activated with Mn4+ which may include at least one of (A) A2[MF5]:Mn4+; where A is selected from Li, Na, K, Rb, Cs, NH4, and combinations thereof; and where M is selected from Al, Ga, In, or combinations thereof; (B) A3[MF6]:Mn4+, where A is selected from Li, Na, K, Rb, Cs, NH4, and combinations thereof; and where M is selected from Al, Ga, In, or combinations thereof; (C) Zn2[MF7]:Mn4+, where M is selected from Al, Ga, In, or combinations thereof; and (D) A[In2F7]:Mn4+ where A is selected from Li, Na, K, Rb, Cs, NH4, or combinations thereof.Type: GrantFiled: February 13, 2007Date of Patent: January 19, 2010Assignee: Lumination LLCInventors: Emil Vergilov Radkov, Anant Achyut Setlur, Alok Mani Srivastava, Ljudmil Slavchev Grigorov
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Patent number: 7646032Abstract: A light emitting apparatus including a phosphor blend including two or more phosphors to provide an emission spectrum simulating the spectral power distribution of a CIE reference illuminant across at least a certain spectral range. Such an apparatus is particularly suited for color-critical applications.Type: GrantFiled: June 4, 2007Date of Patent: January 12, 2010Assignee: Lumination LLCInventors: Emil Vergilov Radkov, Anant Achyut Setlur, Ilona Elisabeth Hausmann, Marisa L. Goodin, legal representative
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Publication number: 20090167151Abstract: Provided are a lighting device, a backlighting device, and a display device that comprise a radiation source such as LED and wavelength converting members comprising phosphors. In one embodiment, self-absorption within the devices is suppressed or reduced by placing a selective reflector between two wavelength converting members, and the wavelength converting member emitting light with longer peak wavelength is substantially isolated from the irradiation of another wavelength converting member emitting light with shorter peak wavelength. In other embodiments, the wavelength converting members are arranged in strip configuration; or in adjacent hexagons configuration.Type: ApplicationFiled: December 27, 2007Publication date: July 2, 2009Inventors: Boris Kolodin, Srinath Aanegola, Emil Vergilov Radkov
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Publication number: 20090162667Abstract: The present invention provides a lighting device such as a backlighting device, and display thereof such as LCD display. The lighting device comprises one or more radiation sources such as UV-blue LED and a layer of air- and moisture-sensitive phosphor, such as complex fluoride activated with Mn4+. The phosphor layer is protected from air and moisture by placing it between two moisture/air impermeable members. The lighting device exhibits increased life, reliability and color stability over time and absence of restrictions imposed on the LED spacing, among others.Type: ApplicationFiled: December 20, 2007Publication date: June 25, 2009Inventor: Emil Vergilov Radkov
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Publication number: 20090085049Abstract: There is provided a phosphor down converting element based on fluoropolymer resin and a method for fabricating the same. There is further provided a method for using said phosphor down converting element to generate white light from a radiation source. The method for fabricating phosphor down converting element includes preparing an appropriate phosphor powder mixture that is capable of absorbing a first band of wavelengths and emitting a second band of wavelengths being greater in length than the first bands, incorporating the phosphor powder mixture into or on a phosphor carrier element comprising a fluoropolymer material, and molding the phosphor down converting elements into useful shapes. Fluoropolymers are the most chemically inert of all plastics, can withstand both extremely high and low temperatures, and show a resistance to weavering and UV degradation, making fluoropolymers optimal for use as a phosphor carrier.Type: ApplicationFiled: September 27, 2007Publication date: April 2, 2009Inventors: Boris Kolodin, Emil Vergilov Radkov
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Patent number: 7497973Abstract: Light emitting devices including a light source and a phosphor material including a complex fluoride phosphor activated with Mn4+ which may comprise at least one of (1) A2[MF6]:Mn4+, where A is selected from Li, Na, K, Rb, Cs, NH4, and combinations thereof; and where M is selected from Ge, Si, Sn, Ti, Zr, and combinations thereof; (2) E[MF6]:Mn4+, where E is selected from Mg, Ca, Sr, Ba, Zn, and combinations thereof; and where M is selected from Ge, Si, Sn, Ti, Zr, and combinations thereof; (3) Ba0.65Zr0.35F2.70:Mn4+; or (4) A3[ZrF7]:Mn4+ where A is selected from Li, Na, K, Rb, Cs, NH4, and combinations thereof.Type: GrantFiled: February 28, 2006Date of Patent: March 3, 2009Assignee: Lumination LLCInventors: Emil Vergilov Radkov, Ljudmil Slavchev Grigorov, Anant Achyut Setlur, Alok Mani Srivastava
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Publication number: 20080296596Abstract: Phosphor compositions, blends thereof and light emitting devices including white light emitting LED based devices, and backlights, based on such phosphor compositions. The devices include a light source and a phosphor material as described. Also disclosed are phosphor blends including such a phosphor and devices made therefrom.Type: ApplicationFiled: May 30, 2007Publication date: December 4, 2008Inventors: Anant Achyut Setlur, Oltea Puica Siclovan, Prasanth Kumar Nammalwar, Ramesh Rao Sathyanarayan, Digamber G. Porob, Ramachandran Gopi Chandran, William Jordan Heward, Emil Vergilov Radkov, Linda Jane Valyou Briel
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Patent number: 7453195Abstract: A lighting apparatus for emitting white light including a semiconductor light source emitting radiation with a peak at from about 250 nm to about 500 nm; a first phosphor having a peak emission between about 450 and 550 nm; and a second phosphor having a peak emission between about 615 and 670 nm; wherein the overall emission spectrum of the lighting apparatus has a depression between about 550 and 615 nm, said depression extending to between about 5% and 25% of the highest intensity of the emission spectrum of the lighting apparatus in the region from 400 to 700 nm. In this apparatus, the red-green color contrast is increased versus the referent illuminant.Type: GrantFiled: November 22, 2005Date of Patent: November 18, 2008Assignee: Lumination LLCInventor: Emil Vergilov Radkov
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Patent number: 7442326Abstract: Phosphor compositions having the formula LlMmAaGgPpQqNnZz:Ce3+, where L is at least one of Li, Na, K, Rb, and/or Cs; M is at least one of Be, Mg, Ca, Sr, Ba, Mn, Sn, Pb, and/or Zn; A is at least one of Bi, Sb, In, Sc, Y, and/or any of the rare earth elements; G is Si and/or Ge; Q is at least one of O, S, and/or Se; Z is at least one of F, Cl, Br, and/or I; and wherein 0?l?1, 2.5?m?5, 1.5?a?2.5, 2?g?2.5, 0?p?1, 0?n?1, 0?z?1, and l+2m+3a+4g+5p=2q+3n+z; and light emitting devices including a light source and the above phosphor. Also disclosed are blends of LlMmAaGgPpQqNnZz:Ce3+ and one or more additional phosphors and light emitting devices incorporating the same.Type: GrantFiled: November 23, 2005Date of Patent: October 28, 2008Assignee: Lumination LLCInventors: Anant Achyut Setlur, Alok Mani Srivastava, Holly Ann Comanzo, Yan Gao, Emil Vergilov Radkov
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Publication number: 20080116468Abstract: An LED backlight apparatus includes a plurality of radiation emitting diodes, each diode emits radiation having a peak wavelength of about less than 430 nm. Each diode is located on a back surface of a housing. The housing may have an opening. A screen covers the opening and the screen includes a discrete pattern of phosphor coated red light emitting pixels, a second discrete pattern of phosphor coated green light emitting pixels, and a third discrete pattern of phosphor coated blue light emitting pixels. The emitted radiation may excite the phosphor coated pixels. The apparatus may also include a radiation regulating element proximate the screen and further include a diffuser proximate the diodes.Type: ApplicationFiled: November 22, 2006Publication date: May 22, 2008Inventors: Emil Vergilov Radkov, Thomas F. Soules, Larry Stadelman
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Patent number: 7358542Abstract: Phosphor compositions including those having the formulas A2-xEuxW1-yMoyO6, where A is selected from Y, Gd, Lu, La, and combinations thereof; and where 0.5?x?1.0, 0.01?y?1.0; MmOnX, wherein M is selected from the group of Sc, Y, a lanthanide, an alkali earth metal and mixtures thereof; X is a halogen; 1?m?3; and 1?n?4, and wherein the lanthanide doping level can range from 0.1 to 40% spectral weight; and Eu3+ activated phosphate or borate phosphors. Also disclosed are light emitting devices including a light source and at least one of the above phosphor compositions.Type: GrantFiled: February 2, 2005Date of Patent: April 15, 2008Assignee: Lumination LLCInventors: Emil Vergilov Radkov, Anant Achyut Setlur, Alok Mani Srivastava, Holly Ann Comanzo, Ljudmil Slavchev Grigorov, Thomas Francis McNulty, Daniel Darcy Doxsee, William Winder Beers
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Patent number: 7321191Abstract: There is provided a blue-green illumination system, including a semiconductor light emitter, and a luminescent material, wherein the system has an emission with CIE color coordinates located within an area of a of a pentagon on a CIE chromaticity diagram, whose corners have the following CIE color coordinates: i) x=0.0137 and y=0.4831; ii) x=0.2240 and y=0.3890; iii) x=0.2800 and y=0.4500; iv) x=0.2879 and y=0.5196; and v) x=0.0108 and y=0.7220. The luminescent material includes two or more phosphors. The illumination system may be used as the green light of a traffic light or an automotive display.Type: GrantFiled: November 2, 2004Date of Patent: January 22, 2008Assignee: Lumination LLCInventors: Anant Achyut Setlur, Emil Vergilov Radkov, Alok Mani Srivastava, Stanton Earl Weaver, Thomas Elliot Stecher, Holly Ann Comanzo
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Patent number: 7262439Abstract: Disclosed are phosphor compositions having the formulas Ca1?a?bCeaEubAl1+aSi1?aN3, where 0<a?0.2, 0?b?0.2; Ca1?c?dCecEudAl1?c(Mg,Zn)cSiN3, where 0<c?0.2, 0?d?0.2; Ca1?2e?fCee(Li,Na)eEufAlSiN3, where 0?e?0.2, 0?f?0.2, g+h>0; and Ca1?g?h?iCeg(Li,Na)hEuiAl1+g?hSi1?g+hN3 where 0?g?0.2, 0<h?0.4, 0?i?0.2,g+i>0. When combined with radiation from a blue or UV light source, these phosphors can provide light sources with good color quality having high CRI over a large color temperature range. Also disclosed are blends of the above phosphors and additional phosphors.Type: GrantFiled: November 22, 2005Date of Patent: August 28, 2007Assignee: Lumination LLCInventors: Anant Achyut Setlur, Emil Vergilov Radkov