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: 20050214576
    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: May 3, 2005
    Publication date: September 29, 2005
    Inventors: Sergey Lamansky, Mark Thompson, Vadim Adamovich, Peter Djurovich, Chihaya Adachi, Marc Baldo, Stephen Forrest, Raymond Kwong
  • Publication number: 20050196895
    Abstract: An organic semiconductor device is provided. The device has a first electrode and a second electrode, with an organic semiconductor layer disposed between the first and second electrodes. An electrically conductive grid is disposed within the organic semiconductor layer, which has openings in which the organic semiconductor layer is present. At least one insulating layer is disposed adjacent to the electrically conductive grid, preferably such that the electrically conductive grid is completely separated from the organic semiconductor layer by the insulating layer. Methods of fabricating the device, and the electrically conductive grid in particular, are also provided. In one method, openings are formed in an electrically conductive layer with a patterned die, which is then removed. In another method, an electrically conductive layer and a first insulating layer are etched through the mask to expose portions of a first electrode.
    Type: Application
    Filed: April 25, 2005
    Publication date: September 8, 2005
    Inventors: Marc Baldo, Peter Peumans, Stephen Forrest, Changsoon Kim
  • Patent number: 6939624
    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: Grant
    Filed: October 16, 2001
    Date of Patent: September 6, 2005
    Assignees: Universal Display Corporation, The University of Southern California, The Trustees of Princeton University
    Inventors: Sergey Lamansky, Mark E. Thompson, Vadim Adamovich, Peter I. Djurovich, Chihaya Adachi, Marc A. Baldo, Stephen R. Forrest, Raymond Kwong
  • Patent number: 6902830
    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: Grant
    Filed: June 13, 2002
    Date of Patent: June 7, 2005
    Assignees: The Trustees of Princeton University, The University of Southern California
    Inventors: Mark E. Thompson, Peter Djurovic, Sergey Lamansky, Drew Murphy, Raymond Kwong, Feras Abdel-Razzaq, Stephen R. Forrest, Marc A. Baldo, Paul E. Burrows
  • Patent number: 6900588
    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: Grant
    Filed: May 30, 2003
    Date of Patent: May 31, 2005
    Assignee: The Trustees of Princeton University
    Inventors: Chihaya Adachi, Marc A. Baldo, Stephen R. Forrest
  • Patent number: 6894307
    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: January 31, 2003
    Date of Patent: May 17, 2005
    Assignee: The Trustees of Princeton University
    Inventors: Stephen R. Forrest, Mark E. Thompson, Marc A. Baldo
  • Patent number: 6884093
    Abstract: An organic semiconductor device is provided. The device has a first electrode and a second electrode, with an organic semiconductor layer disposed between the first and second electrodes. An electrically conductive grid is disposed within the organic semiconductor layer, which has openings in which the organic semiconductor layer is present. At least one insulating layer is disposed adjacent to the electrically conductive grid, preferably such that the electrically conductive grid is completely separated from the organic semiconductor layer by the insulating layer. Methods of fabricating the device, and the electrically conductive grid in particular, are also provided. In one method, openings are formed in an electrically conductive layer with a patterned die, which is then removed. In another method, an electrically conductive layer and a first insulating layer are etched through the mask to expose portions of a first electrode.
    Type: Grant
    Filed: September 17, 2002
    Date of Patent: April 26, 2005
    Assignee: The Trustees of Princeton University
    Inventors: Marc Baldo, Peter Peumans, Stephan Forrest, Changsoon Kim
  • Patent number: 6867538
    Abstract: Phosphorescent OLEDs having a double doped-layer structure wherein the OLEDs include a hole transporting layer (HTL) having a phosphorescent material doped therein, and an electron transporting layer (ETL) having the same phosphorescent material doped therein. Typically, these phosphorescent OLEDs have an anode, a first HTL over the anode, a second HTL that is doped with a phosphorescent material over the first HTL, a first ETL that is doped with a phosphorescent material over the second HTL, a second ETL over the first ETL, and a cathode over the second ETL. These phosphorescent OLEDs preferably include blue phosphorescent OLEDs with high efficiency levels.
    Type: Grant
    Filed: March 1, 2002
    Date of Patent: March 15, 2005
    Assignee: The Trustees of Princeton University
    Inventors: Chihaya Adachi, Marc A. Baldo, Stephen R. Forrest
  • Publication number: 20040262576
    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 16, 2004
    Publication date: December 30, 2004
    Inventors: Mark E. Thompson, Peter Djurovich, Sergey Lamansky, Drew Murphy, Raymond Kwong, Feras Abdel-Razzaq, Stephen R. Forrest, Marc A. Baldo, Paul E. Burrows
  • Patent number: 6830828
    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: Grant
    Filed: June 18, 2001
    Date of Patent: December 14, 2004
    Assignees: The Trustees of Princeton University, The University of Southern California
    Inventors: Mark E. Thompson, Peter Djurovich, Sergey Lamansky, Stephen R. Forrest, Marc A. Baldo, Paul E. Burrows
  • Publication number: 20040100189
    Abstract: The present invention relates to an organic light emitting device structure having an organic light emitting device (OLED) over a substrate, where the OLED has, for example, an anode, a hole transporting layer (HTL), a first electron transporting layer (ETL) that is doped with a phosphorescent material, a second electron transporting layer (ETL), and a cathode. The OLEDs of the present invention are directed, in particular, to devices that include an emissive layer comprised of an electron transporting host material having a triplet excited state energy level that is higher than the emissive triplet excited state energy level of the phosphorescent dopant material.
    Type: Application
    Filed: October 31, 2003
    Publication date: May 27, 2004
    Inventors: Chihaya Adachi, Marc A. Baldo, Stephen R. Forrest
  • Publication number: 20030209972
    Abstract: When the density of excitons in an organic single crystal (including the linear acenes, polyacenes, and thiophenes) approaches the density of molecular sites, an electron-hole plasma may form in the material altering the overall excitonic character of the system. The formation of the electron-hole plasma arises as a result of the screening of Coulomb interactions within individual excitons by injected free carriers. The large exciton densities required to accomplish this screening process can only be realized when excitons collect near dislocations, defects, traps, or are confined in heterostructures. Such confinement and subsequently large exciton densities allows for the observation of physical phenomena not generally accessible in an organic material. Specifically, the formation of an electron-hole plasma in an organic single crystal can allow for the observation of field-effect transistor action and electrically-pumped lasing.
    Type: Application
    Filed: May 10, 2002
    Publication date: November 13, 2003
    Inventors: Russell James Delmar Holmes, Marc A. Baldo, Stephen R. Forrest
  • Patent number: 6645645
    Abstract: An organic light emitting device structure having an organic light emitting device (OLED) over a substrate, where the OLED has, for example, an anode, a hole transporting layer (HTL), a first electron transporting layer (ETL) that is doped with a phosphorescent material, a second electron transporting layer (ETL), and a cathode. The OLEDs of the present invention are directed, in particular, to devices that include an emissive layer comprised of an electron transporting host material having a triplet excited state energy level that is higher than the emissive triplet excited state energy level of the phosphorescent dopant material.
    Type: Grant
    Filed: August 1, 2000
    Date of Patent: November 11, 2003
    Assignee: The Trustees of Princeton University
    Inventors: Chihaya Adachi, Marc A. Baldo, Stephen R. Forrest
  • Publication number: 20030197467
    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: May 30, 2003
    Publication date: October 23, 2003
    Inventors: Chihaya Adachi, Marc A. Baldo, Stephen R. Forrest
  • Publication number: 20030178619
    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: January 31, 2003
    Publication date: September 25, 2003
    Inventors: Stephen R. Forrest, Mark E. Thompson, Marc A. Baldo
  • Patent number: 6573651
    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: Grant
    Filed: December 18, 2000
    Date of Patent: June 3, 2003
    Assignee: The Trustees of Princeton University
    Inventors: Chihaya Adachi, Marc A. Baldo, Stephen R. Forrest
  • Patent number: 6515298
    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 25, 2001
    Date of Patent: February 4, 2003
    Assignees: The Trustees of Princeton University, The University of Southern California
    Inventors: Stephen R. Forrest, Mark E. Thompson, Marc A. Baldo
  • Publication number: 20030017361
    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 13, 2002
    Publication date: January 23, 2003
    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: 20030015698
    Abstract: An organic semiconductor device is provided. The device has a first electrode and a second electrode, with an organic semiconductor layer disposed between the first and second electrodes. An electrically conductive grid is disposed within the organic semiconductor layer, which has openings in which the organic semiconductor layer is present. At least one insulating layer is disposed adjacent to the electrically conductive grid, preferably such that the electrically conductive grid is completely separated from the organic semiconductor layer by the insulating layer. Methods of fabricating the device, and the electrically conductive grid in particular, are also provided. In one method, openings are formed in an electrically conductive layer with a patterned die, which is then removed. In another method, an electrically conductive layer and a first insulating layer are etched through the mask to expose portions of a first electrode.
    Type: Application
    Filed: September 17, 2002
    Publication date: January 23, 2003
    Inventors: Marc Baldo, Peter Peumans, Stephen Forrest, Changsoon Kim
  • Publication number: 20020180347
    Abstract: Phosphorescent OLEDs having a double doped-layer structure wherein the OLEDs include a hole transporting layer (HTL) having a phosphorescent material doped therein, and an electron transporting layer (ETL) having the same phosphorescent material doped therein. Typically, these phosphorescent OLEDs have an anode, a first HTL over the anode, a second HTL that is doped with a phosphorescent material over the first HTL, a first ETL that is doped with a phosphorescent material over the second HTL, a second ETL over the first ETL, and a cathode over the second ETL. These phosphorescent OLEDs preferably include blue phosphorescent OLEDs with high efficiency levels.
    Type: Application
    Filed: March 1, 2002
    Publication date: December 5, 2002
    Inventors: Chihaya Adachi, Marc A. Baldo, Stephen R. Forrest