Patents by Inventor Ronan P. Le Toquin

Ronan P. Le Toquin 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).

  • Patent number: 10767111
    Abstract: A method is disclosed for forming a blended phosphor composition. The method includes the steps of firing precursor compositions that include europium and nitrides of at least calcium, strontium and aluminum, in a refractory metal crucible and in the presence of a gas that precludes the formation of nitride compositions between the nitride starting materials and the refractory metal that forms the crucible. The resulting compositions can include phosphors that convert frequencies in the blue portion of the visible spectrum into frequencies in the red portion of the visible spectrum.
    Type: Grant
    Filed: March 8, 2019
    Date of Patent: September 8, 2020
    Assignee: CREE, INC.
    Inventors: Brian T. Collins, Christopher P. Hussell, David T. Emerson, Ronan P. Le Toquin
  • Publication number: 20190203117
    Abstract: A method is disclosed for forming a blended phosphor composition. The method includes the steps of firing precursor compositions that include europium and nitrides of at least calcium, strontium and aluminum, in a refractory metal crucible and in the presence of a gas that precludes the formation of nitride compositions between the nitride starting materials and the refractory metal that forms the crucible. The resulting compositions can include phosphors that convert frequencies in the blue portion of the visible spectrum into frequencies in the red portion of the visible spectrum.
    Type: Application
    Filed: March 8, 2019
    Publication date: July 4, 2019
    Applicant: Cree, Inc.
    Inventors: Brian T. Collins, Christopher P. Hussell, David T. Emerson, Ronan P. Le Toquin
  • Patent number: 10266767
    Abstract: A method is disclosed for forming a blended phosphor composition. The method includes the steps of firing precursor compositions that include europium and nitrides of at least calcium, strontium and aluminum, in a refractory metal crucible and in the presence of a gas that precludes the formation of nitride compositions between the nitride starting materials and the refractory metal that forms the crucible. The resulting compositions can include phosphors that convert frequencies in the blue portion of the visible spectrum into frequencies in the red portion of the visible spectrum.
    Type: Grant
    Filed: August 11, 2016
    Date of Patent: April 23, 2019
    Assignee: Cree, Inc.
    Inventors: Brian T. Collins, Christopher P. Hussell, David T. Emerson, Ronan P. Le Toquin
  • Publication number: 20160348000
    Abstract: A method is disclosed for forming a blended phosphor composition. The method includes the steps of firing precursor compositions that include europium and nitrides of at least calcium, strontium and aluminum, in a refractory metal crucible and in the presence of a gas that precludes the formation of nitride compositions between the nitride starting materials and the refractory metal that forms the crucible. The resulting compositions can include phosphors that convert frequencies in the blue portion of the visible spectrum into frequencies in the red portion of the visible spectrum.
    Type: Application
    Filed: August 11, 2016
    Publication date: December 1, 2016
    Applicant: Cree, Inc.
    Inventors: Brian T. Collins, Christopher P. Hussell, David T. Emerson, Ronan P. Le Toquin
  • Patent number: 9464225
    Abstract: A luminescent particle includes a luminescent compound that is configured to perform a photon down conversion on a portion of received light and a reflectance reducing outer surface of the luminescent particle that is operable to increase the portion of received light that is absorbed in the luminescent particle.
    Type: Grant
    Filed: November 17, 2009
    Date of Patent: October 11, 2016
    Assignee: Cree, Inc.
    Inventors: Brian Thomas Collins, Ronan P. Le Toquin
  • Patent number: 9428688
    Abstract: A method is disclosed for forming a blended phosphor composition. The method includes the steps of firing precursor compositions that include europium and nitrides of at least calcium, strontium and aluminum, in a refractory metal crucible and in the presence of a gas that precludes the formation of nitride compositions between the nitride starting materials and the refractory metal that forms the crucible. The resulting compositions can include phosphors that convert frequencies in the blue portion of the visible spectrum into frequencies in the red portion of the visible spectrum.
    Type: Grant
    Filed: November 17, 2008
    Date of Patent: August 30, 2016
    Assignee: Cree, Inc.
    Inventors: Brian T. Collins, Christopher P. Hussell, David T. Emerson, Ronan P. Le Toquin
  • Patent number: 9401461
    Abstract: A light emitting diode is disclosed, together with associated wafer structures, and fabrication and mapping techniques. The diode includes an active portion, a raised border on the top surface of the active portion and around the perimeter of the top surface of the active portion, a resin in the space defined by the border and the top surface of the active portion, and phosphor particles in the resin that convert the frequencies emitted by the active portion.
    Type: Grant
    Filed: July 11, 2007
    Date of Patent: July 26, 2016
    Assignee: CREE, INC.
    Inventors: Peter S. Andrews, Joshua J. Markle, Ronan P. Le Toquin
  • Patent number: 9054282
    Abstract: A semiconductor structure includes an active region configured to emit light upon the application of a voltage thereto, a window layer configured to receive the light emitted by the active region, and a plurality of discrete phosphor-containing regions on the window layer and configured to receive light emitted by the active region and to convert at least a portion of the received light to a different wavelength than a wavelength of light emitted by the active region. Methods of forming a semiconductor structure including an active region configured to emit light and a window layer include forming a plurality of discrete phosphor-containing regions on the window layer.
    Type: Grant
    Filed: December 22, 2010
    Date of Patent: June 9, 2015
    Assignee: Cree, Inc.
    Inventors: Peter S. Andrews, Ronan P. Le Toquin, James Ibbetson
  • Patent number: 8998444
    Abstract: A solid state lighting apparatus includes a plurality of light emitting diodes (LEDs) including at least a first LED and a second LED. Chromaticities of the first and second LEDs are selected so that a combined light generated by a mixture of light from the pair of LEDs has about a target chromaticity. The first LED may include a first LED chip that emits light in the blue portion of the visible spectrum and a phosphor that emits red light in response to blue light emitted by the first LED chip. The second LED emits light having a color point that is above the planckian locus of a 1931 CIE Chromaticity diagram, and in particular may have a yellow green, greenish yellow or green hue.
    Type: Grant
    Filed: June 25, 2009
    Date of Patent: April 7, 2015
    Assignee: Cree, Inc.
    Inventors: John Roberts, Gerald H. Negley, Antony P. van de Ven, Arpan Chakraborty, Bernd Keller, Ronan P. Le Toquin
  • Patent number: 8920676
    Abstract: A luminescent cerium (Ce) doped compound emitting bright red light, comprising a calcium silicate nitride ternary system, such as CaSiN2-?O?:Ce3+, that crystallizes in a face-centered cubic unit cell with a lattice parameter of ╦ťa=14.88 ?. The Ce doped compound can be used for white light applications either: (i) to enhance the light quality of the system based on a blue LED with a yellow or green phosphor, (ii) as an orange phosphor in combination with a blue LED and a green phosphor, or (iii) as a red phosphor in a setup comprising a ultraviolet (UV) LED and red, green and blue (RGB) phosphors. Substitution of smaller elements on the Ca site or larger elements on the Si site leads to a decrease of the emission wavelength towards the yellow or orange region.
    Type: Grant
    Filed: October 2, 2006
    Date of Patent: December 30, 2014
    Assignee: The Regents of the University of California
    Inventors: Anthony K. Cheetham, Ronan P. Le Toquin
  • Patent number: 8597543
    Abstract: Compounds of the following Formula may be useful as phosphors in solid state light emitting devices: AaBbCcDdEe, wherein A includes calcium (Ca), strontium (Sr), barium (Ba), magnesium (Mg), yttrium (Y), hafnium (Hf), the lanthanide elements and/or the other alkaline earth (Group IIA) metals; B includes Eu2+ and Ce3+; C includes at least one tetrahedrally-coordinated trivalent element; D includes at least one tetrahedrally-coordinated tetravalent element; E includes N, O, F, C, S, Cl, Br and/or I, wherein a+b=1, c+d=2, and wherein the compound has a CaAlSiN3-type crystal structure. Light emitting devices including such phosphors may emit warm white light.
    Type: Grant
    Filed: February 6, 2012
    Date of Patent: December 3, 2013
    Assignee: Cree, Inc.
    Inventor: Ronan P. Le Toquin
  • Publication number: 20120132857
    Abstract: Compounds of Formula I, which include both cerium and europium, may be useful as phosphors in solid state light emitting devices. Light emitting devices including such phosphors may emit warm white light.
    Type: Application
    Filed: February 6, 2012
    Publication date: May 31, 2012
    Inventor: Ronan P. Le Toquin
  • Patent number: 8119028
    Abstract: Compounds of Formula I, which include both cerium and europium, may be useful as phosphors in solid state light emitting devices. Light emitting devices including such phosphors may emit warm white light.
    Type: Grant
    Filed: October 14, 2008
    Date of Patent: February 21, 2012
    Assignee: Cree, Inc.
    Inventor: Ronan P. Le Toquin
  • Patent number: 8038497
    Abstract: A method of fabricating a light emitting device (LED) includes measuring emission characteristics for a plurality of LED chips configured to emit light of a first color. The plurality of LED chips are sorted based on the measured emission characteristics to provide a plurality of groups respectively including ones of the plurality of LED chips having similar measured emission characteristics. A respective light conversion material is selected for each of the plurality of groups based on the measured emission characteristics of the ones of the plurality of LED chips included therein and a desired color point. The selected light conversion material is configured to absorb at least some of the light of the first color and responsively emit light of a second color.
    Type: Grant
    Filed: April 22, 2009
    Date of Patent: October 18, 2011
    Assignee: Cree, Inc.
    Inventor: Ronan P. Le Toquin
  • Publication number: 20110089456
    Abstract: A semiconductor structure includes an active region configured to emit light upon the application of a voltage thereto, a window layer configured to receive the light emitted by the active region, and a plurality of discrete phosphor-containing regions on the window layer and configured to receive light emitted by the active region and to convert at least a portion of the received light to a different wavelength than a wavelength of light emitted by the active region. Methods of forming a semiconductor structure including an active region configured to emit light and a window layer include forming a plurality of discrete phosphor-containing regions on the window layer.
    Type: Application
    Filed: December 22, 2010
    Publication date: April 21, 2011
    Inventors: Peter S. Andrews, Ronan P. Le Toquin, James Ibbetson
  • Publication number: 20110012141
    Abstract: A packaged light emitting device (LED) includes an LED chip configured to emit light within a first wavelength range, and a wavelength conversion material on the LED chip. The wavelength conversion material is configured to receive the light within the first wavelength range and responsively emit light within a second wavelength range different than the first wavelength range such that a light output of the packaged LED does not substantially include the light within the first wavelength range and provides an appearance of substantially monochromatic light of a color of the visible spectrum corresponding to the second wavelength range. The packaged LED may include a color filter on the wavelength conversion material that is configured to prevent passage of the light within the first wavelength range therethrough, and/or may include a thickness of the wavelength conversion material configured to completely absorb the light within the first wavelength range.
    Type: Application
    Filed: July 15, 2009
    Publication date: January 20, 2011
    Inventors: Ronan P. Le Toquin, George Brandes
  • Patent number: 7863635
    Abstract: A semiconductor structure includes an active region configured to emit light upon the application of a voltage thereto, a window layer configured to receive the light emitted by the active region, and a plurality of discrete phosphor-containing regions on the window layer and configured to receive light emitted by the active region and to convert at least a portion of the received light to a different wavelength than a wavelength of light emitted by the active region. Methods of forming a semiconductor structure including an active region configured to emit light and a window layer include forming a plurality of discrete phosphor-containing regions on the window layer.
    Type: Grant
    Filed: August 7, 2007
    Date of Patent: January 4, 2011
    Assignee: Cree, Inc.
    Inventors: Peter S. Andrews, Ronan P. Le Toquin, James Ibbetson
  • Publication number: 20100127613
    Abstract: A luminescent particle includes a luminescent compound that is configured to perform a photon down conversion on a portion of received light and a reflectance reducing outer surface of the luminescent particle that is operable to increase the portion of received light that is absorbed in the luminescent particle.
    Type: Application
    Filed: November 17, 2009
    Publication date: May 27, 2010
    Inventors: Brian Thomas Collins, Ronan P. Le Toquin
  • Publication number: 20100123104
    Abstract: A method is disclosed for forming a blended phosphor composition. The method includes the steps of firing precursor compositions that include europium and nitrides of at least calcium, strontium and aluminum, in a refractory metal crucible and in the presence of a gas that precludes the formation of nitride compositions between the nitride starting materials and the refractory metal that forms the crucible. The resulting compositions can include phosphors that convert frequencies in the blue portion of the visible spectrum into frequencies in the red portion of the visible spectrum.
    Type: Application
    Filed: November 17, 2008
    Publication date: May 20, 2010
    Inventors: Brian T. Collins, Christopher P. Hussell, David T. Emerson, Ronan P. Le Toquin
  • Publication number: 20100079059
    Abstract: A solid state lighting apparatus includes a plurality of light emitting diodes (LEDs) including at least a first LED and a second LED. Chromaticities of the first and second LEDs are selected so that a combined light generated by a mixture of light from the pair of LEDs has about a target chromaticity. The first LED may include a first LED chip that emits light in the blue portion of the visible spectrum and a phosphor that emits red light in response to blue light emitted by the first LED chip. The second LED emits light having a color point that is above the planckian locus of a 1931 CIE Chromaticity diagram, and in particular may have a yellow green, greenish yellow or green hue.
    Type: Application
    Filed: June 25, 2009
    Publication date: April 1, 2010
    Inventors: John Roberts, Gerald H. Negley, Antony P. van de Ven, Arpan Chakraborty, Bernd Keller, Ronan P. Le Toquin