Patents by Inventor Charng-Hsing Liu

Charng-Hsing Liu 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).

  • Bis-phenanthroimidazolyl compound and electroluminescent device using the same
    Patent number: 8048542
    Abstract: A bis-phenanthroimidazolyl compound having a following formula is disclosed. Where A1 and A2 comprise identical or different aromatic rings, A3 comprises a polyaromatic hydrocarbon or at least two aromatic groups, and each carbon in A1 to A3 and phenanthrol groups is independently substituted or non-substituted. The bis-phenanthroimidazolyl compound exhibits relatively better thermal properties with higher glass-transition temperature and efficient blue emission. The bis-phenanthroimidazolyl compound may function as a host emitter or charge-transporter. An electroluminescent device is also disclosed.
    Type: Grant
    Filed: April 2, 2009
    Date of Patent: November 1, 2011
    Assignee: National Tsing Hua University
    Inventors: Chien-Hong Cheng, Charng-Hsing Liu, Fang-Iy Wu
  • BIS-PHENANTHROIMIDAZOLYL COMPOUND AND ELECTROLUMINESCENT DEVICE USING THE SAME
    Publication number: 20100253208
    Abstract: A bis-phenanthroimidazolyl compound having a following formula is disclosed. Where A1 and A2 comprise identical or different aromatic rings, A3 comprises a polyaromatic hydrocarbon or at least two aromatic groups, and each carbon in A1 to A3 and phenanthrol groups is independently substituted or non-substituted. The bis-phenanthroimidazolyl compound exhibits relatively better thermal properties with higher glass-transition temperature and efficient blue emission. The bis-phenanthroimidazolyl compound may function as a host emitter or charge-transporter. An electroluminescent device is also disclosed.
    Type: Application
    Filed: April 2, 2009
    Publication date: October 7, 2010
    Inventors: Chien-Hong CHENG, Charng-Hsing Liu, Fang-IY WU