Patents by Inventor Ikjun Cho

Ikjun Cho 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).

  • Quantum dot light emitting device including ligand-substituted quantum dot light emitting layer with polymer having amine groups and method for fabricating the same
    Patent number: 10892433
    Abstract: Disclosed is a quantum dot light emitting device including a ligand-substituted quantum dot light emitting layer with a polymer having amine groups. The introduction of the ligand-substituted quantum dot light emitting layer with a polymer having amine groups changes the energy level of an electron transport layer and enables control over the charge injection properties of the device so that the flow of electrons can be controlled. In addition, the ligand substitution is effective in removing oleic acid as a stabilizer of quantum dots to prevent an increase in driving voltage caused by the introduction of the additional material, achieving markedly improved efficiency of the device. Also disclosed is a method for fabricating the quantum dot light emitting device.
    Type: Grant
    Filed: June 2, 2017
    Date of Patent: January 12, 2021
    Assignees: Korea University Research and Business Foundation, Korea Institute of Science and Technology
    Inventors: Jinhan Cho, Wan Ki Bae, Ikjun Cho
  • QUANTUM DOT LIGHT EMITTING DEVICE INCLUDING LIGAND-SUBSTITUTED QUANTUM DOT LIGHT EMITTING LAYER WITH POLYMER HAVING AMINE GROUPS AND METHOD FOR FABRICATING THE SAME
    Publication number: 20170352827
    Abstract: Disclosed is a quantum dot light emitting device including a ligand-substituted quantum dot light emitting layer with a polymer having amine groups. The introduction of the ligand-substituted quantum dot light emitting layer with a polymer having amine groups changes the energy level of an electron transport layer and enables control over the charge injection properties of the device so that the flow of electrons can be controlled. In addition, the ligand substitution is effective in removing oleic acid as a stabilizer of quantum dots to prevent an increase in driving voltage caused by the introduction of the additional material, achieving markedly improved efficiency of the device. Also disclosed is a method for fabricating the quantum dot light emitting device.
    Type: Application
    Filed: June 2, 2017
    Publication date: December 7, 2017
    Inventors: Jinhan Cho, Wan Ki Bae, Ikjun Cho