Patents by Inventor Won-bin Im

Won-bin Im 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).

  • Solid solution phosphors based on oxyfluoride and white light emitting diodes including the phosphors for solid state white lighting applications
    Patent number: 8535565
    Abstract: Phosphor compositions comprising a solid solution series between Sr3AlO4F and Sr3SiO5 and a solid solution series between Sr3AlO4F and GdSr2AlO5, are disclosed. A white light emitting LED using the phosphor compositions is also disclosed.
    Type: Grant
    Filed: October 13, 2010
    Date of Patent: September 17, 2013
    Assignee: The Regents of the University of California
    Inventors: Won-Bin Im, Ram Seshadri, Steven P. DenBaars
  • Oxyfluoride phosphors and white light emitting diodes including the oxyfluoride phosphor for solid-state lighting applications
    Patent number: 8344611
    Abstract: A blue-green emitting Ce3+-activated oxyfluoride phosphor for use with a light emitting diode (LED) in solid state lighting applications. The blue-green emitting Ce3+-activated oxyfluoride phosphor is represented as: (Sr1-x-yAEy)3(Al1-zTz)O4F:Ce3+x wherein 0<x?0.3, 0?y?1, AE includes at least one element selected from alkaline earth metals on the periodic table, for example, Mg, Ca and Ba, 0?z?1, and T includes at least one atom selected from Al, B, Ga, and In. The blue-green emitting Ce3+-activated oxyfluoride phosphor may be combined with another phosphor to generate the white light. Specifically, the present invention provides for white light generation by combining the blue-green emitting Ce3+-activated oxyfluoride phosphor with either a near-ultraviolet (UV) LED and red emitting phosphor, or with a near-UV LED and a red-yellow phosphor.
    Type: Grant
    Filed: June 16, 2010
    Date of Patent: January 1, 2013
    Assignee: The Regents of the University of California
    Inventors: Won-Bin Im, Ram Seshadri, Steven P. DenBaars
  • Yellow emitting phosphors based on Ce-doped aluminate and via solid solution for solid-state lighting applications
    Patent number: 8163203
    Abstract: A Ce3+ based aluminate phosphor or Ce3+ based phosphor in a solid solution can be used for white light generation when combined with a blue or ultraviolet light emitting diode.
    Type: Grant
    Filed: February 27, 2009
    Date of Patent: April 24, 2012
    Assignee: The Regents of the University of California
    Inventors: Won-bin Im, Ram Seshadri, Steven P. DenBaars
  • SOLID SOLUTION PHOSPHORS BASED ON OXYFLUORIDE AND WHITE LIGHT EMITTING DIODES INCLUDING THE PHOSPHORS FOR SOLID STATE WHITE LIGHTING APPLICATIONS
    Publication number: 20110101272
    Abstract: Phosphor compositions comprising a solid solution series between Sr3AlO4F and Sr3SiO5 and a solid solution series between Sr3AlO4F and GdSr2AlO5, are disclosed. A white light emitting LED using the phosphor compositions is also disclosed.
    Type: Application
    Filed: October 13, 2010
    Publication date: May 5, 2011
    Applicant: THE REGENTS OF THE UNIVERSITY OF CALIFORNIA
    Inventors: Won-Bin Im, Ram Seshadri, Steven P. DenBaars
  • OXYFLUORIDE PHOSPHORS AND WHITE LIGHT EMITTING DIODES INCLUDING THE OXYFLUORIDE PHOSPHOR FOR SOLID-STATE LIGHTING APPLICATIONS
    Publication number: 20100314993
    Abstract: A blue-green emitting Ce3+-activated oxyfluoride phosphor for use with a light emitting diode (LED) in solid state lighting applications. The blue-green emitting Ce3+-activated oxyfluoride phosphor is represented as: (Sr1-x-yAEy)3(Al1-zTz)O4F:Ce3+x wherein 0<x?0.3, 0?y?1, AE includes at least one element selected from alkaline earth metals on the periodic table, for example, Mg, Ca and Ba, 0?z?1, and T includes at least one atom selected from Al, B, Ga, and In. The blue-green emitting Ce3+-activated oxyfluoride phosphor may be combined with another phosphor to generate the white light. Specifically, the present invention provides for white light generation by combining the blue-green emitting Ce3+-activated oxyfluoride phosphor with either a near-ultraviolet (UV) LED and red emitting phosphor, or with a near-UV LED and a red-yellow phosphor.
    Type: Application
    Filed: June 16, 2010
    Publication date: December 16, 2010
    Applicant: THE REGENTS OF THE UNIVERSITY OF CALIFORNIA
    Inventors: Won-Bin Im, Ram Seshadri, Steven P. DenBaars
  • PHOTOELECTROCHEMICAL ETCHING OF P-TYPE SEMICONDUCTOR HETEROSTRUCTURES
    Publication number: 20090283800
    Abstract: A method for photoelectrochemical (PEC) etching of a p-type semiconductor layer simply and efficiently, by providing a driving force for holes to move towards a surface of a p-type cap layer to be etched, wherein the p-type cap layer is on a heterostructure and the heterostructure provides the driving force from an internal bias generated internally in the heterostructure; generating electron-hole pairs in a separate area of the heterostructure than the surface to be etched; and using an etchant solution to etch the surface of the p-type layer.
    Type: Application
    Filed: May 12, 2009
    Publication date: November 19, 2009
    Applicant: THE REGENTS OF THE UNIVERSITY OF CALIFORNIA
    Inventors: Won-bin Im, Ram Seshadri, Steven P. DenBaars
  • YELLOW EMITTING PHOSPHORS BASED ON Ce3+-DOPED ALUMINATE AND VIA SOLID SOLUTION FOR SOLID-STATE LIGHTING APPLICATIONS
    Publication number: 20090212314
    Abstract: A Ce3+ based aluminate phosphor or Ce3+ based phosphor in a solid solution can be used for white light generation when combined with a blue or ultraviolet light emitting diode.
    Type: Application
    Filed: February 27, 2009
    Publication date: August 27, 2009
    Applicant: THE REGENTS OF THE UNIVERSITY OF CALIFORNIA
    Inventors: Won-Bin Im, Ram Seshadri, Steven P. DenBaars