Patents by Inventor Xiaohang Li

Xiaohang Li 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: 11069834
    Abstract: An optoelectronic device a substrate, a first doped contact layer arranged on the substrate, a multiple quantum well layer arranged on the first doped contact layer, a boron nitride alloy electron blocking layer arranged on the multiple quantum well layer, and a second doped contact layer arranged on the boron nitride alloy electron blocking layer.
    Type: Grant
    Filed: September 12, 2018
    Date of Patent: July 20, 2021
    Assignee: KING ABDULLAH UNIVERSITY OF SCIENCE AND TECHNOLOGY
    Inventors: Xiaohang Li, Wenzhe Guo, Haiding Sun
  • Publication number: 20210074875
    Abstract: A light-emitting diode includes an n-type aluminum nitride layer formed on a substrate, a multiple quantum well formed on the n-type aluminum nitride layer, and a p-type aluminum nitride hole-injection layer formed adjacent to the multiple quantum well. The multiple quantum well includes a first aluminum nitride quantum well layer having a fixed composition and surrounded by first and second aluminum nitride quantum barrier layers, and a second aluminum nitride quantum well layer having a fixed composition and surrounded by the second aluminum nitride quantum barrier layer and a third aluminum nitride quantum barrier layer. At least one of the first, second, and third aluminum nitride quantum barrier layers has a graded aluminum composition. The first aluminum nitride quantum barrier layer is adjacent to the n-type aluminum nitride layer and the third aluminum nitride quantum barrier layer is adjacent to the p-type aluminum nitride hole-injection layer.
    Type: Application
    Filed: June 10, 2019
    Publication date: March 11, 2021
    Inventor: Xiaohang LI
  • Patent number: 10916424
    Abstract: A method for forming a semiconductor device comprising a graded wurtzite III-nitride alloy layer, including a wurtzite III-nitride alloy, on a second layer. A polarization doping concentration profile is selected for the graded wurtzite III-nitride alloy layer based on an intended function of the semiconductor device. Based on the selected polarization doping concentration profile for the graded wurtzite III-nitride alloy layer, a composition-polarization change rate of the graded wurtzite III-nitride alloy layer and a grading speed of the graded wurtzite III-nitride alloy layer are determined. The composition-polarization change rate and grading speed are based on a composition of first and second elements of the wurtzite III-nitride alloy.
    Type: Grant
    Filed: December 4, 2018
    Date of Patent: February 9, 2021
    Assignee: KING ABDULLAH UNIVERSITY OF SCIENCE AND TECHNOLOGY
    Inventors: Xiaohang Li, Kaikai Liu
  • Publication number: 20200402791
    Abstract: A method for forming a semiconductor device involves selecting a substrate on which a wurtzite III-nitride alloy layer will be formed, and a piezoelectric polarization and an effective piezoelectric coefficient for the wurtzite III-nitride alloy layer. It is determined whether there is a wurtzite III-nitride alloy composition satisfying the selected effective piezoelectric coefficient. It is also determined whether there is a thickness for a layer formed from the wurtzite III-nitride alloy composition satisfying the selected piezoelectric polarization based on the selected substrate and the selected effective piezoelectric coefficient.
    Type: Application
    Filed: December 4, 2018
    Publication date: December 24, 2020
    Inventors: Xiaohang LI, Kaikai LIU
  • Publication number: 20200388722
    Abstract: An optoelectronic device a substrate, a first doped contact layer arranged on the substrate, a multiple quantum well layer arranged on the first doped contact layer, a boron nitride alloy electron blocking layer arranged on the multiple quantum well layer, and a second doped contact layer arranged on the boron nitride alloy electron blocking layer.
    Type: Application
    Filed: September 12, 2018
    Publication date: December 10, 2020
    Inventors: Xiaohang LI, Wenzhe GUO, Haiding SUN
  • Publication number: 20200365396
    Abstract: A method for forming a semiconductor device comprising a graded wurtzite III-nitride alloy layer, including a wurtzite III-nitride alloy, on a second layer. A polarization doping concentration profile is selected for the graded wurtzite III-nitride alloy layer based on an intended function of the semiconductor device. Based on the selected polarization doping concentration profile for the graded wurtzite III-nitride alloy layer, a composition-polarization change rate of the graded wurtzite III-nitride alloy layer and a grading speed of the graded wurtzite III-nitride alloy layer are determined. The composition-polarization change rate and grading speed are based on a composition of first and second elements of the wurtzite III-nitride alloy.
    Type: Application
    Filed: December 4, 2018
    Publication date: November 19, 2020
    Inventors: Xiaohang LI, Kaikai LIU
  • Publication number: 20200273973
    Abstract: A semiconductor device includes a III-nitride buffer layer and a III-nitride barrier layer. A boron nitride alloy interlayer interposed between the III-nitride buffer layer and the III-nitride barrier layer. A portion of the III-nitride buffer layer includes a two-dimensional electron gas (2DEG) channel that is on a side of the III-nitride buffer layer adjacent to the boron nitride alloy interlayer.
    Type: Application
    Filed: October 15, 2018
    Publication date: August 27, 2020
    Inventor: Xiaohang LI
  • Publication number: 20200274024
    Abstract: A method for forming a III-nitride semiconductor device involves determining work functions of a first III-nitride contact layer and a first metal contact. The determined work function of the first III-nitride contact layer is based on a group III element of the first III-nitride contact layer. Based on the determined work functions of the first III-nitride contact layer and of the first metal contact, it is determined that the work function of the first III-nitride contact layer should be adjusted. The III-nitride semiconductor device is formed including the first III-nitride contact layer adjacent to a second III-nitride contact layer, the first metal contact arranged on the first III-nitride contact layer, and a second metal contact arranged on the second III-nitride contact layer.
    Type: Application
    Filed: October 15, 2018
    Publication date: August 27, 2020
    Inventors: Haiding SUN, Xiaohang LI
  • Publication number: 20200234952
    Abstract: A method for forming a semiconductor device having a heterojunction of a first III-nitride ternary alloy layer arranged on a second III-nitride ternary alloy layer is provided. A range of concentrations of III-nitride elements for the first and second III-nitride ternary alloy layers is determined so that the absolute value of the polarization difference at the interface of the heterojunction of the first and second III-nitride ternary alloy layers is less than or equal to 0.007 C/m2 or greater than or equal to 0.04 C/m2. Specific concentrations of III-nitride elements for the first and second III-nitride ternary alloy layers are selected from the determined range of concentrations so that the absolute value of the polarization difference at the interface of the heterojunction of the first and second III-nitride ternary alloy layers is less than or equal to 0.007 C/m2 or greater than or equal to 0.04 C/m2.
    Type: Application
    Filed: April 3, 2020
    Publication date: July 23, 2020
    Inventors: Xiaohang LI, Kaikai LIU
  • Publication number: 20190335548
    Abstract: Embodiments of the present disclosure describe a susceptor for chemical vapor deposition comprising a horizontal component with a top surface and a bottom surface, wherein the top surface is configured to support one or more wafers; a vertical component extending from the bottom surface of the horizontal component along a longitudinal axis that is substantially perpendicular to the horizontal component; and a hollow region within the vertical component. Embodiments of the present disclosure describe a susceptor for chemical vapor deposition comprising a horizontal plate with a top surface configured to support one or more wafers, a vertical rod integrated with and perpendicular to the horizontal plate, and a hollow region within the vertical rod for promoting temperature uniformity across the top surface of the horizontal plate.
    Type: Application
    Filed: July 10, 2019
    Publication date: October 31, 2019
    Inventors: Xiaohang LI, Kuang-Hui LI, Hamad Saud ALOTAIBI
  • Publication number: 20190186006
    Abstract: A susceptor device for a chemical vapor deposition (CVD) reactor including metal organic CVD (MOCVD) used in the semiconductor industry. The susceptor device particularly is used with induction heating and includes a horizontal plate adapted for holding one or more wafers and a vertical rod around which the induction heating coils are disposed. A screw system and an insulator can further be used. This design helps prevent undesired levitation and allows for the gas injectors of the reactors to be placed closer to the wafer for deposition during high-temperature deposition processes at susceptor surface temperatures of about 1500° C. or higher.
    Type: Application
    Filed: September 18, 2017
    Publication date: June 20, 2019
    Inventors: Xiaohang LI, Kuang-Hui LI, Hamad S. ALOTAIBI
  • Patent number: 9660725
    Abstract: Techniques are presented herein to enable identification of light fixtures. A light fixture modulates light emitted by the light fixture with an identifier associated with the light fixture. The identifier may be encoded or encrypted before it is modulated. In one example, the identifier is a Universally Unique Identifier (UUID). A user device is positioned to detect light emitted by the light fixture. The user device demodulates the light to obtain the identifier. The identifier, time and location associated with detection of the identifier are sent to a management entity for use in provisioning the light fixture on a network.
    Type: Grant
    Filed: July 30, 2014
    Date of Patent: May 23, 2017
    Assignee: Cisco Technology, Inc.
    Inventors: John D. Parello, Donald Schriner, Luis O. Suau, Xiaohang Li
  • Patent number: 9596739
    Abstract: A lighting control system is provided which accepts user lightning commands, generates controls in accordance with predetermined operating policies and directs light fixtures to produce brightness, color, or directional pattern of the light emitted by the light fixtures. The lighting control system determines whether the light emitted by the light fixtures complies with government regulations, and building policies, and insures that controls are adjusted such that all regulations regarding lighting safety and working conditions, as well as building policy and energy management targets are adhered to. In addition, a way to reconcile conflicting user requests for lighting settings is provided.
    Type: Grant
    Filed: July 31, 2014
    Date of Patent: March 14, 2017
    Assignee: Cisco Technology, Inc.
    Inventors: Matthew A. Laherty, John D. Parello, William MacGowan, Charles Calvin Byers, Xiaohang Li, Luis O. Suau, Donald Schriner
  • Patent number: 9560728
    Abstract: Techniques presented herein are directed to lighting management techniques supporting lighting functions of networked light fixtures. In accordance with one example, a light fixture in networked lighting system accepts a lighting request transmitted by a computing device. The light fixture determines whether the lighting request is a control message or a query message and performs one or more operations in response to the lighting request depending on whether the lighting request is a control message or a query message.
    Type: Grant
    Filed: February 23, 2016
    Date of Patent: January 31, 2017
    Assignee: Cisco Technology, Inc.
    Inventors: John D. Parello, Jason Potterf, Xiaohang Li
  • Publication number: 20160347627
    Abstract: Liquid purifying apparatus integrating a filter assembly and an ultraviolet light disinfection assembly that are suitable for portable water purification are described. A first apparatus includes a container, a cap assembly including a filter removably coupled to a first opening of the container and a disinfection assembly coupled to a second opening of the container and adapted to emit UV light to disinfect liquid in the container. A second apparatus includes upper and lower reservoirs, a filter assembly between the reservoirs, a disinfection assembly coupled to an opening in the lower reservoir and adapted to emit UV light to disinfect liquid in the lower reservoir and a spout in fluid communication with the lower reservoir.
    Type: Application
    Filed: August 11, 2016
    Publication date: December 1, 2016
    Inventor: Xiaohang Li
  • Publication number: 20160174347
    Abstract: Techniques presented herein are directed to lighting management techniques supporting lighting functions of networked light fixtures. In accordance with one example, a light fixture in networked lighting system accepts a lighting request transmitted by a computing device. The light fixture determines whether the lighting request is a control message or a query message and performs one or more operations in response to the lighting request depending on whether the lighting request is a control message or a query message.
    Type: Application
    Filed: February 23, 2016
    Publication date: June 16, 2016
    Inventors: John D. Parello, Jason Potterf, Xiaohang Li
  • Patent number: 9307621
    Abstract: Techniques presented herein are directed to lighting management techniques supporting lighting functions of networked light fixtures. In accordance with one example, a light fixture in networked lighting system accepts a lighting request transmitted by a computing device. The light fixture determines whether the lighting request is a control message or a query message and performs one or more operations in response to the lighting request depending on whether the lighting request is a control message or a query message.
    Type: Grant
    Filed: December 8, 2014
    Date of Patent: April 5, 2016
    Assignee: Cisco Technology, Inc.
    Inventors: John D. Parello, Jason Potterf, Xiaohang Li
  • Publication number: 20160036526
    Abstract: Techniques are presented herein to enable identification of light fixtures. A light fixture modulates light emitted by the light fixture with an identifier associated with the light fixture. The identifier may be encoded or encrypted before it is modulated. In one example, the identifier is a Universally Unique Identifier (UUID). A user device is positioned to detect light emitted by the light fixture. The user device demodulates the light to obtain the identifier. The identifier, time and location associated with detection of the identifier are sent to a management entity for use in provisioning the light fixture on a network.
    Type: Application
    Filed: July 30, 2014
    Publication date: February 4, 2016
    Inventors: John D. Parello, Donald Schriner, Luis O. Suau, Xiaohang Li
  • Publication number: 20160037613
    Abstract: A lighting control system is provided which accepts user lightning commands, generates controls in accordance with predetermined operating policies and directs light fixtures to produce brightness, color, or directional pattern of the light emitted by the light fixtures. The lighting control system determines whether the light emitted by the light fixtures complies with government regulations, and building policies, and insures that controls are adjusted such that all regulations regarding lighting safety and working conditions, as well as building policy and energy management targets are adhered to. In addition, a way to reconcile conflicting user requests for lighting settings is provided.
    Type: Application
    Filed: July 31, 2014
    Publication date: February 4, 2016
    Inventors: Matthew A. Laherty, John D. Parello, William MacGowan, Charles Calvin Byers, Xiaohang Li, Luis O. Suau, Donald Schriner
  • Patent number: 9024292
    Abstract: A monolithic semiconductor light emitting device is described. The device includes an n-type region, a p-type region, an active region of a multiple quantum well structure comprising a plurality of alternating barrier and active layers interposed between the n-type region and the p-type region. The device emits multiple single-wavelength spectral distributions of ultraviolet light each having a peak wavelength of between 210 nm and 400 nm and/or a broadband spectral output having a wavelength of between 210 nm and 400 nm. Methods of making the device and lamps comprising the device are also described.
    Type: Grant
    Filed: May 31, 2013
    Date of Patent: May 5, 2015
    Inventor: Xiaohang Li