Patents by Inventor Il-ji Lim

Il-ji Lim 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).

  • FLUORESCENT MATERIAL FOR WHITE LIGHT EMITTING DIODE AND PREPARATION METHOD THEREOF
    Publication number: 20160312116
    Abstract: A fluorescent material of a garnet structure having an aluminate-based fluorescent material, cerium as an activator and thulium as a coactivator can emit green light with high luminance under an excitation condition by a blue light source, and therefore, it is useful as a fluorescent material for a white light emitting diode.
    Type: Application
    Filed: November 13, 2013
    Publication date: October 27, 2016
    Inventors: Sanghyuk Han, Kyoung Hoon Kim, Il Ji Lim
  • Naphthalene derivative, organic material including the same, and organic electroluminescent device including the same
    Patent number: 9024304
    Abstract: The present invention provides a compound represented by the following formula 1. The compound of the present invention has high luminance, high luminous efficiency, excellent color purity and excellent high-temperature stability, and thus can provide a material for an organic electroluminescent device and an organic electroluminescent device having a long lifetime.
    Type: Grant
    Filed: March 29, 2012
    Date of Patent: May 5, 2015
    Assignee: Dae Joo Electronic Materials Co., Ltd.
    Inventors: Young Min Jeon, Chang Hyung Lee, Jeong Gyu Park, Sang Jin Nam, Hyo Jin Min, Joon Woo Kim, Il Ji Lim
  • NAPHTHALENE DERIVATIVE, ORGANIC MATERIAL INCLUDING THE SAME, AND ORGANIC ELECTROLUMINESCENT DEVICE INCLUDING THE SAME
    Publication number: 20140299849
    Abstract: The present invention provides a compound represented by the following formula 1. The compound of the present invention has high luminance, high luminous efficiency, excellent color purity and excellent high-temperature stability, and thus can provide a material for an organic electroluminescent device and an organic electroluminescent device having a long lifetime.
    Type: Application
    Filed: March 29, 2012
    Publication date: October 9, 2014
    Applicant: Dae Joo Electronic Materials Co., Ltd.
    Inventors: Young Min Jeon, Chang Hyung Lee, Jeong Gyu Park, Sang Jin Nam, Hyo Jin Min, Joon Woo Kim, Il Ji Lim
  • Thulium-containing fluorescent substance for white light emitting diode and manufacturing method thereof
    Patent number: 8119030
    Abstract: Disclosed is a thulium-containing fluorescent substance for a white light emitting diode represented by a following chemical formula 1, (Chemical Formula 1) (M1-X-J7EuxTnIy)2SiO4 where M is a divalent cation metal including Sr or Ba, with 0.005<x<0.05 and 0.005<y<0.05. The silicate-based yellow fluorescent substance according to the present invention is sufficiently excited by a blue light source generated by a blue LED to exhibit a yellow emission, with superior luminous intensity, due to the addition of europium oxide (Eu2O3) and thulium oxide (Tm2O3) as an activator, thereby being suitable for a white LED.
    Type: Grant
    Filed: June 5, 2007
    Date of Patent: February 21, 2012
    Assignee: Daejoo Electronic Materials Co., Ltd.
    Inventors: Sang-hyuk Han, Jae-seob Hwang, Il-ji Lim
  • Thulium-Containing Fluorescent Substance For White Light Emitting Diode And Manufacturing Method Thereof
    Publication number: 20100163797
    Abstract: Disclosed is a thulium-containing fluorescent substance for a white light emitting diode represented by a following chemical formula 1, (Chemical Formula 1) (M1-X-J7EuxTnIy)2SiO4 where M is a divalent cation metal including Sr or Ba, with 0.005<x<0.05 and 0.005<y<0.05. The silicate-based yellow fluorescent substance according to the present invention is sufficiently excited by a blue light source generated by a blue LED to exhibit a yellow emission, with superior luminous intensity, due to the addition of europium oxide (Eu2O3) and thulium oxide (Tm2O3) as an activator, thereby being suitable for a white LED.
    Type: Application
    Filed: June 5, 2007
    Publication date: July 1, 2010
    Applicant: DAEJOO ELECTRONIC MATERIAL CO., LTD.
    Inventors: Sang-hyuk Han, Jae-seob Hwang, Il-ji Lim
  • Pb-free glass composition for barrier ribs of plasma display panel, and plasma display panel comprising the Pb-free glass barrier ribs prepared therefrom
    Publication number: 20060019814
    Abstract: Disclosed is a Pb-free glass composition for barrier ribs of a PDP, which includes from 20 to 70 wt % of ZnO; from 10 to 50 wt % of BaO; from 10 to 40 wt % of B2O3; from 0 to 20 wt % of P2O5; from 0 to 20 Wt % of SiO2; from 0 to 20 wt % of Bi2O3; from 0 to 30 wt % of V2O5; from 0 to 10 wt % of one or more oxides selected from the group consisting of Na2O, Li2O, and K2O; from 0 to 10 wt % of CaO; from 0 to 10 wt % of MgO; from 0 to 30 wt % of SrO; from 0 to 20 wt % of MoO3; from 0 to 10 wt % of Al2O3; from 0 to 10 wt % of one or more oxides selected from the group consisting of Sb2O3, CuO, Cr2O3, As2O3, CoO, and NiO; and from 0 to 10 wt % of TiO2, and a plasma display panel comprising the Pb-free glass barrier ribs prepared therefrom.
    Type: Application
    Filed: June 22, 2005
    Publication date: January 26, 2006
    Inventors: Nam-Seok Baik, Nam-Ha Cho, Cheol-Hee Moon, Chang-Seok Rho, Min-Soo Kang, Myung-Ick Hwang, Woo-Sung Sim, Il-Ji Lim
  • Polymer electrolyte membrane fuel cell
    Publication number: 20040033413
    Abstract: The present invention provides a separator for a polymer electrolyte membrane fuel cell which comprises a resin substrate and an electroconductive coating formed on the substrate.
    Type: Application
    Filed: August 18, 2003
    Publication date: February 19, 2004
    Inventors: Jong-Jin Yoon, Il-Ji Lim, Akihisa Saitoh