Patents by Inventor Yimin Gu
Yimin Gu 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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Publication number: 20130100659Abstract: A scattered photon extraction light fixture includes an optic element having a first surface; a light source for emitting short wavelength radiation, the light source disposed opposite, perpendicular, or tangential to the first surface of the optic element; a wavelength-conversion material, disposed on the first surface of the optic element, for receiving and down converting at least some of the short wavelength radiation emitted by the light source and transferring a portion of the received and down converted radiation; and one or more reflectors positioned opposite the wavelength-conversion material. A scattered photon extraction light system includes a plurality of light emitting fixtures. One or more wavelength-conversion materials, in the embodiments of the present invention, are disposed remotely from the light source(s), and used to absorb radiation in one spectral region and emit radiation in another spectral region.Type: ApplicationFiled: March 11, 2011Publication date: April 25, 2013Applicant: RENSSELAER POLYTECHNIC INSTITUTEInventors: Nadarajah Narendran, Yimin Gu, Jean Paul Freyssinier, Yiting Zhu
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Publication number: 20120218624Abstract: A light emitting apparatus has a radiation source for emitting short wavelength radiation. A down conversion material receives and down converts at least some of the short wavelength radiation emitted by the radiation source and back transfers a portion of the received and down converted radiation. An optic device adjacent the down conversion material at least partially surrounds the radiation source. The optic device is configured to extract at least some of the back transferred radiation. A sealant substantially seals a space between the radiation source and the optic device.Type: ApplicationFiled: April 23, 2012Publication date: August 30, 2012Applicant: Rensselaer Polytechnic InstituteInventors: Nadarajah Narendran, Yimin Gu
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Patent number: 8164825Abstract: A light emitting apparatus has a radiation source for emitting short wavelength radiation. A down conversion material receives and down converts at least some of the short wavelength radiation emitted by the radiation source and back transfers a portion of the received and down converted radiation. An optic device adjacent the down conversion material at least partially surrounds the radiation source. The optic device is configured to extract at least some of the back transferred radiation. A sealant substantially seals a space between the radiation source and the optic device.Type: GrantFiled: January 10, 2011Date of Patent: April 24, 2012Assignee: Rensselaer Polytechnic InstituteInventors: Nadarajah Narendran, Yimin Gu
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Patent number: 8031393Abstract: A light emitting apparatus has a radiation source for emitting short wavelength radiation. A down conversion material receives and down converts at least some of the short wavelength radiation emitted by the radiation source and back transfers a portion of the received and down converted radiation. An optic device adjacent the down conversion material at least partially surrounds the radiation source. The optic device is configured to extract at least some of the back transferred radiation. A sealant substantially seals a space between the radiation source and the optic device.Type: GrantFiled: January 10, 2011Date of Patent: October 4, 2011Assignee: Renesselaer Polytechnic InstituteInventors: Nadarajah Narendran, Yimin Gu
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Publication number: 20110102883Abstract: A light emitting apparatus has a radiation source for emitting short wavelength radiation. A down conversion material receives and down converts at least some of the short wavelength radiation emitted by the radiation source and back transfers a portion of the received and down converted radiation. An optic device adjacent the down conversion material at least partially surrounds the radiation source. The optic device is configured to extract at least some of the back transferred radiation. A sealant substantially seals a space between the radiation source and the optic device.Type: ApplicationFiled: January 10, 2011Publication date: May 5, 2011Applicant: Rensselaer Polytechnic InstituteInventors: Nadarajah Narendran, Yimin Gu
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Publication number: 20110102884Abstract: A light emitting apparatus has a radiation source for emitting short wavelength radiation. A down conversion material receives and down converts at least some of the short wavelength radiation emitted by the radiation source and back transfers a portion of the received and down converted radiation. An optic device adjacent the down conversion material at least partially surrounds the radiation source. The optic device is configured to extract at least some of the back transferred radiation. A sealant substantially seals a space between the radiation source and the optic device.Type: ApplicationFiled: January 10, 2011Publication date: May 5, 2011Applicant: Rensselaer Polytechnic InstituteInventors: Nadarajah Narendran, Yimin Gu
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Publication number: 20110063830Abstract: A light emitting apparatus has a light source for emitting a first light in a forward direction. A wavelength-converting layer is spaced apart from the light source and disposed in a path of the first light. The wavelength-converting layer is configured to absorb at least a portion of the first light and emit a second light. A reflective layer is configured to be reflective of at least the second light, and the wavelength-converting layer is disposed between the reflective layer and the light source.Type: ApplicationFiled: November 17, 2010Publication date: March 17, 2011Applicant: RENSSELAER POLYTECHNIC INSTITUTEInventors: Nadarajah Narendran, Yimin Gu
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Patent number: 7889421Abstract: A light emitting apparatus has a radiation source for emitting short wavelength radiation. A down conversion material receives and down converts at least some of the short wavelength radiation emitted by the radiation source and back transfers a portion of the received and down converted radiation. An optic device adjacent the down conversion material at least partially surrounds the radiation source. The optic device is configured to extract at least some of the back transferred radiation. A sealant substantially seals a space between the radiation source and the optic device.Type: GrantFiled: December 22, 2006Date of Patent: February 15, 2011Assignee: Rensselaer Polytechnic InstituteInventors: Nadarajah Narendran, Yimin Gu
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Patent number: 7837348Abstract: A light emitting apparatus has a radiation source for emitting multi-colored radiation. A diffuser material receives at least a portion of the multi-colored radiation emitted by the radiation source and converts the multi-colored radiation into forward transferred radiation and back transferred radiation. An optic device is coupled to the diffuser material and is adapted to receive the back transferred radiation and extract at least a portion of the back transferred radiation from the optic device.Type: GrantFiled: December 20, 2006Date of Patent: November 23, 2010Assignee: Rensselaer Polytechnic InstituteInventors: Nadarajah Narendran, Yimin Gu
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Patent number: 7819549Abstract: A light emitting apparatus includes a source of light for emitting light; a down conversion material receiving the emitted light, and converting the emitted light into transmitted light and backward transmitted light; and an optic device configured to receive the backward transmitted light and transfer the backward transmitted light outside of the optic device. The source of light is a semiconductor light emitting diode, a laser diode (LD), or a resonant cavity light emitting diode (RCLED). The down conversion material includes one of phosphor or other material for absorbing light in one spectral region and emitting light in another spectral region. The optic device, or lens, includes light transmissive material.Type: GrantFiled: May 5, 2005Date of Patent: October 26, 2010Assignee: Rensselaer Polytechnic InstituteInventors: Nadarajah Narendran, Yimin Gu, Jean Paul Freyssinier
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Patent number: 7750359Abstract: A broad bandwidth light source including: a solid state light emitting device that generates short wavelength light; and quantum dot material and phosphor material that are each irradiated by some of the short wavelength light. The short wavelength light has a spectrum with a first peak wavelength shorter than about 500 nm. The quantum dot material absorbs some of the short wavelength light and reemits it as long wavelength light having a spectrum with a second peak wavelength longer than about 600 nm. The phosphor material absorbs some of the short wavelength light and reemits it as mid wavelength light having a spectrum with a peak wavelength between the first and second peak wavelength. The light source is configured such that some of each light (short, mid, and long wavelength) is emitted coincidentally as a light having a chromaticity value near the blackbody locus and a color rendering index greater than 80.Type: GrantFiled: June 20, 2006Date of Patent: July 6, 2010Assignee: Rensselaer Polytechnic InstituteInventors: Nadarajah Narendran, Yimin Gu
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Patent number: 7703942Abstract: A light emitting apparatus having a light source for emitting short wavelength radiation and an optic device configured to receive the radiation emitted from the light source. A device directs at least some of the short wavelength radiation emitted from the light source into the optic device and a down conversion material receives at least some of the short wavelength radiation directed into the optic device in one spectral region and emits the radiation in another spectral region.Type: GrantFiled: December 20, 2006Date of Patent: April 27, 2010Assignee: Rensselaer Polytechnic InstituteInventors: Nadarajah Narendran, Jean Paul Freyssinier, Yimin Gu
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Publication number: 20080117500Abstract: A light emitting apparatus has a radiation source for emitting short wavelength radiation. A down conversion material receives and down converts at least some of the short wavelength radiation emitted by the radiation source and back transfers a portion of the received and down converted radiation. An optic device adjacent the down conversion material at least partially surrounds the radiation source. The optic device is configured to extract at least some of the back transferred radiation. A sealant substantially seals a space between the radiation source and the optic device.Type: ApplicationFiled: December 22, 2006Publication date: May 22, 2008Inventors: Nadarajah Narendran, Yimin Gu
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Publication number: 20080105887Abstract: A broad bandwidth light source including: a solid state light emitting device that generates short wavelength light; and quantum dot material and phosphor material that are each irradiated by some of the short wavelength light. The short wavelength light has a spectrum with a first peak wavelength shorter than about 500 nm. The quantum dot material absorbs some of the short wavelength light and reemits it as long wavelength light having a spectrum with a second peak wavelength longer than about 600 nm. The phosphor material absorbs some of the short wavelength light and reemits it as mid wavelength light having a spectrum with a peak wavelength between the first and second peak wavelength. The light source is configured such that some of each light (short, mid, and long wavelength) is emitted coincidently as a light having a chromaticity value near the blackbody locus and a color rendering index greater than 80.Type: ApplicationFiled: June 20, 2006Publication date: May 8, 2008Inventors: Nadarajah Narendran, Yimin Gu
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Publication number: 20080094829Abstract: A light emitting apparatus has a radiation source for emitting multi-colored radiation. A diffuser material receives at least a portion of the multi-colored radiation emitted by the radiation source and converts the multi-colored radiation into forward transferred radiation and back transferred radiation. An optic device is coupled to the diffuser material and is adapted to receive the back transferred radiation and extract at least a portion of the back transferred radiation from the optic device.Type: ApplicationFiled: December 20, 2006Publication date: April 24, 2008Inventors: Nadarajah Narendran, Yimin Gu
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Publication number: 20080054281Abstract: A light emitting apparatus having a light source for emitting short wavelength radiation and an optic device configured to receive the radiation emitted from the light source. A device directs at least some of the short wavelength radiation emitted from the light source into the optic device and a down conversion material receives at least some of the short wavelength radiation directed into the optic device in one spectral region and emits the radiation in another spectral region.Type: ApplicationFiled: December 20, 2006Publication date: March 6, 2008Inventors: Nadarajah Narendran, Jean Paul Freyssinier, Yimin Gu
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Publication number: 20080030993Abstract: A light emitting apparatus includes a source of light for emitting light; a down conversion material receiving the emitted light, and converting the emitted light into transmitted light and backward transmitted light; and an optic device configured to receive the backward transmitted light and transfer the backward transmitted light outside of the optic device. The source of light is a semiconductor light emitting diode, a laser diode (LD), or a resonant cavity light emitting diode (RCLED). The down conversion material includes one of phosphor or other material for absorbing light in one spectral region and emitting light in another spectral region. The optic device, or lens, includes light transmissive material.Type: ApplicationFiled: May 5, 2005Publication date: February 7, 2008Inventors: Nadarajah Narendran, Yimin Gu, Jean Paul Freyssinier