Patents by Inventor Choon Gi Choi

Choon Gi Choi 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: 9257610
    Abstract: A light emitting diode includes: a substrate; an n-type semiconductor layer disposed on the substrate; an active layer disposed on the n-type semiconductor layer; a p-type semiconductor layer disposed on the active layer; a first electrode disposed on the p-type semiconductor layer and made of a metal oxide; a second electrode disposed on the first electrode and made of graphene; a p-type electrode disposed on the second electrode; and an n-type electrode disposed on the n-type semiconductor layer, wherein a work function of the first electrode is less than a work function of the p-type semiconductor layer, but is greater than a work function of the second electrode.
    Type: Grant
    Filed: May 29, 2014
    Date of Patent: February 9, 2016
    Assignee: ELECTRONICS AND TELECOMMUNICATIONS RESEARCH INSTITUTE
    Inventors: Doo Hyeb Youn, Young-Jun Yu, Kwang Hyo Chung, Choon Gi Choi
  • Patent number: 9203155
    Abstract: Provided are a metamaterial structure and a manufacturing method thereof. The metamaterial structure includes a dielectric layer, nanowires penetrating the dielectric layer and arranged in a spacing having negative refraction with respect to an electromagnetic wave incident on the dielectric layer, and coating layers formed between the nanowires and the dielectric layer.
    Type: Grant
    Filed: March 27, 2012
    Date of Patent: December 1, 2015
    Assignee: ELECTRONICS AND TELECOMMUNICATIONS RESEARCH INSTITUTE
    Inventors: Choon Gi Choi, Muhan Choi
  • Patent number: 9182541
    Abstract: Provided is a graphene optical device. The optical device includes a lower clad, an optical waveguide extended on the lower clad in a first direction, a first dielectric layer disposed on the optical waveguide, and a graphene layer extended on the first dielectric layer in a second direction.
    Type: Grant
    Filed: March 11, 2013
    Date of Patent: November 10, 2015
    Assignee: ELECTRONICS AND TELECOMMUNICATIONS RESEARCH INSTITUTE
    Inventors: Jin Tae Kim, Choon Gi Choi
  • Patent number: 9178032
    Abstract: Provided is a gas sensor including a substrate, a sensing electrode extended in a first direction on the substrate, and a plurality of heaters disposed in a second direction crossing the first direction on the substrate. The plurality of heaters is separated at both sides of the sensing electrode. The plurality of heaters includes graphene.
    Type: Grant
    Filed: January 24, 2014
    Date of Patent: November 3, 2015
    Assignee: ELECTRONICS AND TELECOMMUNICATIONS RESEARCH INSTITUTE
    Inventors: Young-Jun Yu, Hongkyw Choi, Jin Sik Choi, Kwang Hyo Chung, Jin Tae Kim, Doo Hyeb Youn, Choon Gi Choi
  • Publication number: 20150228481
    Abstract: Disclosed is a method of manufacturing a junction electronic device by disposing 2-Dimensional (2D) materials at desired positions by chemically exfoliating the 2D materials, and the method includes: forming a pattern by surface-treating a surface of a substrate; transferring a 2D material by spraying a liquid solution, in which 2D material flakes are dissolved, onto the substrate on which the pattern is formed; forming first electrodes at both sides of the 2D material disposed on the substrate; forming a dielectric layer on the first electrodes; and forming a second electrode on the dielectric layer.
    Type: Application
    Filed: April 22, 2014
    Publication date: August 13, 2015
    Applicant: Electronics and Telecommunications Research Institute
    Inventors: Young Jun YU, Jin Soo KIM, Hong Kyw CHOI, Jin Sik CHOI, Jin Tae KIM, Kwang Hyo CHUNG, Doo Hyeb YOUN, Choon Gi CHOI
  • Publication number: 20150200031
    Abstract: The present invention relates to a method of fabricating a nanowire and graphene-sheet hybrid structure, and a transparent electrode employing the same, in which a hybrid structure, in which a graphene sheet is attached on surfaces of nanowires, is fabricated by fabricating a line pattern, in which nanowires are aligned in a longitudinal direction, by using an electro-spinning method, and then additionally employing a dipping method of dipping the line pattern in a graphene sheet dispersed solution, and the fabricated hybrid structure is applied to the transparent electrode. Accordingly, a crosslinking portion is increased by decreasing a distance between nanowires present inside the line pattern to improve a conductive property of a nanowire metal line. Further, the nanowire with a relative uniform density is present within the fabricated line pattern, so that when the line pattern is fabricated on the entire substrate, it is possible to achieve a uniform distribution of nanowires over a large area.
    Type: Application
    Filed: July 16, 2014
    Publication date: July 16, 2015
    Applicant: Electronics and Telecommunications Research Institute
    Inventors: Doo Hyeb YOUN, Choon Gi CHOI, Jin Soo KIM, Young Jun YU, Jin Sik CHOI, Hong Kyw CHOI
  • Publication number: 20150191358
    Abstract: Disclosed are a method of growing a high-quality single layer graphene by using a Cu/Ni multi-layer metallic catalyst, and a graphene device using the same. The method controls and grows a high-quality single layer graphene by using the Cu/Ni multilayer metallic catalyst, in which a thickness of a nickel lower layer is fixed and a thickness of a copper upper layer is changed in a case where a graphene is grown by a CVD method. According to the method, it is possible to obtain a high-quality single layer graphene, and improve performance of a graphene application device by utilizing the high-quality single layer graphene and thus highly contribute to industrialization of the graphene application device.
    Type: Application
    Filed: June 25, 2014
    Publication date: July 9, 2015
    Applicant: Electronics and Telecommunications Research Institute
    Inventors: Jin Sik CHOI, Hong Kyw CHOI, Ki Chul KIM, Young Jun YU, Jin Soo KIM, Choon Gi CHOI
  • Publication number: 20150194540
    Abstract: Disclosed is an optical detector. The optical detector includes: a first dielectric layer; a graphene optical transmission line formed on the first dielectric layer; a graphene optical detector formed on the first dielectric layer and configured to detect light transmitted along the graphene optical transmission line; electric wires formed on the graphene optical detector; metal pads positioned at both ends of the graphene optical detector and connected with the electric wires; and a second dielectric layer formed on the graphene optical transmission line, in which the graphene optical detector detects an intensity of light incident in a horizontal direction with respect to a surface of the graphene optical transmission line.
    Type: Application
    Filed: June 6, 2014
    Publication date: July 9, 2015
    Applicant: Electronics and Telecommunications Research Institute
    Inventors: Jin Tae KIM, Young Jun YU, Hong Kyw CHOI, Choon Gi CHOI
  • Patent number: 9023166
    Abstract: A method of transferring graphene is provided. A method of transferring graphene in accordance with an exemplary embodiment of the present invention may include forming a graphene layer by composing graphene and a base layer, depositing a self-assembled monolayer on the graphene layer, and separating a combination layer comprising the self-assembled monolayer and the graphene layer from the base layer.
    Type: Grant
    Filed: June 21, 2013
    Date of Patent: May 5, 2015
    Assignee: Electronics and Telecommunications Research Institute
    Inventors: Jin Sik Choi, Young-Jun Yu, Jin Tae Kim, Kwang Hyo Chung, Doo Hyeb Youn, Choon Gi Choi
  • Patent number: 8981345
    Abstract: Provided is a graphene nanoribbon sensor. The sensor includes a substrate, a graphene layer formed on the substrate in a first direction, and an upper dielectric layer on the graphene layer. Here, the graphene layer may have a plurality of electrode regions respectively separated in the first direction and a channel between the plurality of electrode regions.
    Type: Grant
    Filed: March 12, 2013
    Date of Patent: March 17, 2015
    Assignee: Electronics and Telecommunications Research Institute
    Inventors: Young-Jun Yu, Choon Gi Choi
  • Publication number: 20140367731
    Abstract: A light emitting diode includes: a substrate; an n-type semiconductor layer disposed on the substrate; an active layer disposed on the n-type semiconductor layer; a p-type semiconductor layer disposed on the active layer; a first electrode disposed on the p-type semiconductor layer and made of a metal oxide; a second electrode disposed on the first electrode and made of graphene; a p-type electrode disposed on the second electrode; and an n-type electrode disposed on the n-type semiconductor layer, wherein a work function of the first electrode is less than a work function of the p-type semiconductor layer, but is greater than a work function of the second electrode.
    Type: Application
    Filed: May 29, 2014
    Publication date: December 18, 2014
    Applicant: ELECTRONICS AND TELECOMMUNICATIONS RESEARCH INSTITUTE
    Inventors: Doo Hyeb YOUN, Young-Jun YU, Kwang Hyo CHUNG, Choon Gi CHOI
  • Publication number: 20140341496
    Abstract: Provided are an optical modulator modulating optical signals and an optical module including the same. The optical modulator includes a lower clad layer, an optical transmission line extended in a first direction on the lower clad layer, and an upper clad layer on the optical transmission line and the lower clad layer. The optical transmission line may include graphene.
    Type: Application
    Filed: February 19, 2014
    Publication date: November 20, 2014
    Applicant: Electronics and Telecommunications Research Institute
    Inventors: Jin Tae KIM, Kwang Hyo CHUNG, Young-Jun YU, Choon Gi CHOI
  • Patent number: 8890767
    Abstract: Provided are an active metamaterial device operating at a high speed and a manufacturing method thereof. The active metamaterial device includes a first dielectric layer, a lower electrode disposed on the first dielectric layer, a second dielectric layer disposed on the lower electrode, metamaterial patterns disposed on the second dielectric layer, a couple layer disposed on the metamaterial patterns and the second dielectric layer, a third dielectric layer disposed on the couple layer, and an upper electrode disposed on the third dielectric layer.
    Type: Grant
    Filed: March 27, 2012
    Date of Patent: November 18, 2014
    Assignee: Electronics and Telecommunications Research Institute
    Inventors: Choon Gi Choi, Muhan Choi, Sung-Yool Choi
  • Patent number: 8890197
    Abstract: Provided is a light emitting diode, including a sub-mount structure including a first substrate and electrode portions provided on the first substrate, and a light emitting structure mounted on the sub-mount structure to include a first semiconductor layer, a second semiconductor layer, and an active layer between the first semiconductor layer and the second semiconductor layer. The electrode portions may include a first electrode portion and a second electrode portion connected to the first and second semiconductor layers, respectively, and each of the first and second electrode portions may include a first metal layer, a graphene layer, and a second metal layer sequentially provided on the first substrate.
    Type: Grant
    Filed: March 14, 2013
    Date of Patent: November 18, 2014
    Assignee: Electronics and Telecommunications Research Institute
    Inventors: Doo Hyeb Youn, Choon Gi Choi, Kwang Hyo Chung
  • Patent number: 8879158
    Abstract: Provided are a meta material and a method of manufacturing the same. The meta material comprises: a substrate; at least one conductive nano pattern patterned on the substrate and having a size with a negative refractive index in a predetermined electromagnetic wavelength band; and a dielectric layer covering the conductive nano patterns.
    Type: Grant
    Filed: January 25, 2011
    Date of Patent: November 4, 2014
    Assignee: Electronics and Telecommunications Research Institute
    Inventors: Choon Gi Choi, Sang Soon Oh
  • Publication number: 20140287414
    Abstract: A DNA analysis system that controls DNA analysis by wireless using an application of a mobile device and a very small DNA analysis apparatus, and that receives a DNA analysis result in real time on the spot is provided. Therefore, by performing DNA analysis by simultaneously controlling a plurality of small DNA analysis apparatuses using signal processing and screen display functions of a mobile device, analysis speed of DNA is improved, and an analysis result of DNA can be provided in real time. Further, by forming a DNA analysis apparatus in a very small size, DNA can be immediately analyzed with low power consumption on the spot using a small sample, and the DNA analysis apparatus can be carried.
    Type: Application
    Filed: August 28, 2013
    Publication date: September 25, 2014
    Applicant: Electronics and Telecommunications Research Institute
    Inventors: Kwang Hyo CHUNG, Jin Tae KIM, Doo Hyeb YOUN, Ki-Chul KIM, Young-Jun YU, Jin Sik CHOI, Choon Gi CHOI
  • Publication number: 20140238591
    Abstract: A method of transferring graphene is provided. A method of transferring graphene in accordance with an exemplary embodiment of the present invention may include forming a graphene layer by composing graphene and a base layer, depositing a self-assembled monolayer on the graphene layer, and separating a combination layer comprising the self-assembled monolayer and the graphene layer from the base layer.
    Type: Application
    Filed: June 21, 2013
    Publication date: August 28, 2014
    Inventors: Jin Sik CHOI, Young-Jun YU, Jin Tae KIM, Kwang Hyo CHUNG, Doo Hyeb YOUN, Choon Gi CHOI
  • Publication number: 20140231933
    Abstract: Provided is a gas sensor including a substrate, a sensing electrode extended in a first direction on the substrate, and a plurality of heaters disposed in a second direction crossing the first direction on the substrate. The plurality of heaters is separated at both sides of the sensing electrode. The plurality of heaters includes graphene.
    Type: Application
    Filed: January 24, 2014
    Publication date: August 21, 2014
    Applicant: Electronics and Telecommunications Research Institute
    Inventors: Young-Jun YU, Hongkyw CHOI, Jin Sik CHOI, Kwang Hyo CHUNG, Jin Tae KIM, Doo Hyeb YOUN, Choon Gi CHOI
  • Publication number: 20140178598
    Abstract: Disclosed are methods for forming a graphene pattern. The method includes forming a fine pattern defined by at least one trench on a substrate, applying a graphene solution on the fine pattern, and selectively forming a graphene layer on the fine pattern contacting the graphene solution.
    Type: Application
    Filed: June 12, 2013
    Publication date: June 26, 2014
    Inventors: Kwang Hyo CHUNG, Jin Tae KIM, Young-Jun YU, Jin Sik CHOI, Doo Hyeb YOUN, Ki-Chul KIM, Choon Gi CHOI
  • Publication number: 20140103296
    Abstract: Provided is a graphene nanoribbon sensor. The sensor includes a substrate, a graphene layer formed on the substrate in a first direction, and an upper dielectric layer on the graphene layer. Here, the graphene layer may have a plurality of electrode regions respectively separated in the first direction and a channel between the plurality of electrode regions.
    Type: Application
    Filed: March 12, 2013
    Publication date: April 17, 2014
    Applicant: Electronics and Telecommunications Research Institute
    Inventors: Young-Jun YU, Choon Gi Choi