Patents by Inventor Marc A. Baldo

Marc A. Baldo 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).

  • Publication number: 20020182441
    Abstract: Emissive phosphorescent organometallic compounds are described that produce improved electroluminescence, particularly in the blue region of the visible spectrum. Organic light emitting devices employing such emissive phosphorescent organometallic compounds are also described. Also described is an organic light emitting layer including a host material having a lowest triplet excited state having a decay rate of less than about 1 per second; a guest material dispersed in the host material, the guest material having a lowest triplet excited state having a radiative decay rate of greater than about 1×105 or about 1×106 per second and wherein the energy level of the lowest triplet excited state of the host material is lower than the energy level of the lowest triplet excited state of the guest material.
    Type: Application
    Filed: October 16, 2001
    Publication date: December 5, 2002
    Applicant: TRUSTEE OF PRINCETON UNIVERSITY
    Inventors: Sergey Lamansky, Mark E. Thompson, Vadim Adamovich, Peter I. Djurovich, Chihaya Adachi, Marc A. Baldo, Stephen R. Forrest, Raymond Kwong
  • Publication number: 20020113545
    Abstract: The present invention is directed to simplified OLED structures comprising an anode layer, a hole injecting layer (HIL) in direct contact with the anode layer, an emissive organic electron transporting layer (ETL) in direct contact with the hole injecting layer, and a cathode layer in direct contact with the emissive organic electron transporting layer. The hole injecting material used in the hole injecting layer is characterized, in particular, as being an organic material having an ionization potential that is not more than about 0.7 eV greater than the ionization potential of the material used for the anode layer. The emissive organic electron transporting layer comprises an organic electron transporting material and an organic hole-trapping emissive material, for example, an organic phosphorescent material that produces emission from a triplet excited state of an organic molecule.
    Type: Application
    Filed: December 18, 2000
    Publication date: August 22, 2002
    Inventors: Chihaya Adachi, Marc A. Baldo, Stephen R. Forrest
  • Publication number: 20020034656
    Abstract: Organic light emitting devices are described wherein the emissive layer comprises a host material containing an emissive molecule, which molecule is adapted to luminesce when a voltage is applied across the heterostructure, and the emissive molecule is selected from the group of phosphorescent organometallic complexes, including cyclometallated platinum, iridium and osmium complexes. The organic light emitting devices optionally contain an exciton blocking layer. Furthermore, improved electroluminescent efficiency in organic light emitting devices is obtained with an emitter layer comprising organometallic complexes of transition metals of formula L2MX, wherein L and X are distinct bidentate ligands. Compounds of this formula can be synthesized more facilely than in previous approaches and synthetic options allow insertion of fluorescent molecules into a phosphorescent complex, ligands to fine tune the color of emission, and ligands to trap carriers.
    Type: Application
    Filed: June 18, 2001
    Publication date: March 21, 2002
    Inventors: Mark E. Thompson, Peter Djurovich, Sergey Lamansky, Drew Murphy, Raymond Kwong, Feras Abdel-Razzaq, Stephen R. Forrest, Marc A. Baldo, Paul E. Burrows
  • Publication number: 20020008233
    Abstract: Organic light emitting devices are described wherein the emissive layer comprises a host material containing a fluorescent or phosphorescent emissive molecule, which molecule is adapted to luminesce when a voltage is applied across the heterostructure, wherein an intersystem crossing molecule of optical absorption spectrum matched to the emission spectrum of the emissive molecule enhances emission efficiency.
    Type: Application
    Filed: July 25, 2001
    Publication date: January 24, 2002
    Inventors: Stephen R. Forrest, Mark E. Thompson, Marc A. Baldo
  • Patent number: 6310360
    Abstract: Organic light emitting devices are described wherein the emissive layer comprises a host material containing a fluorescent or phosphorescent emissive molecule, which molecule is adapted to luminesce when a voltage is applied across the heterostructure, wherein an intersystem crossing molecule of optical absorption spectrum matched to the emission spectrum of the emissive molecule enhances emission efficiency.
    Type: Grant
    Filed: July 21, 1999
    Date of Patent: October 30, 2001
    Assignees: The Trustees of Princeton University, The University of Southern California
    Inventors: Stephen R. Forrest, Mark E. Thompson, Marc A. Baldo
  • Patent number: 6097147
    Abstract: A light emitting device including a pixel having a substantially transparent anode; a hole transporting layer over the anode; an emission layer over the hole transporting layer; a blocking layer over the emission layer; an electron transporting layer over the blocking layer; and a cathode in electrical contact with the electron transporting layer.
    Type: Grant
    Filed: September 14, 1998
    Date of Patent: August 1, 2000
    Assignee: The Trustees of Princeton University
    Inventors: Marc A Baldo, Diarmuid F. O'Brien, Stephen R. Forrest