Patents by Inventor Ralph H. Young
Ralph H. Young 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).
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Patent number: 8242489Abstract: The invention provides an OLED device comprising an anode, a cathode and a light-emitting layer located therebetween, said light-emitting layer comprising an anthracene host and a styrylamine blue light-emitting compound; and, located between the said light-emitting layer and the cathode, a first electron-transporting layer that is greater than 0.5 nm and less than 5 nm thick; and a second electron-transporting layer consisting essentially of an anthracene located between the first electron-transporting layer and the cathode. The first electron-transporting layer includes a compound with a less negative LUMO level than the anthracene in the second electron-transporting layer. Devices of the invention provide improvement in features such as efficiency.Type: GrantFiled: December 17, 2009Date of Patent: August 14, 2012Assignee: Global OLED Technology, LLC.Inventors: Marina E. Kondakova, Ralph H. Young
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Publication number: 20110147716Abstract: The invention provides an OLED device comprising an anode, a cathode and a light-emitting layer located therebetween, said light-emitting layer comprising an anthracene host and a styrylamine blue light-emitting compound; and, located between the said light-emitting layer and the cathode, a first electron-transporting layer that is greater than 0.5 nm and less than 5 nm thick; and a second electron-transporting layer consisting essentially of an anthracene located between the first electron-transporting layer and the cathode. The first electron-transporting layer includes a compound with a less negative LUMO level than the anthracene in the second electron-transporting layer. Devices of the invention provide improvement in features such as efficiency.Type: ApplicationFiled: December 17, 2009Publication date: June 23, 2011Inventors: MARINA E. KONDAKOVA, Ralph H. Young
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Patent number: 7629741Abstract: An OLED includes an anode, a light-emitting layer disposed over the anode, and a first electron-injecting layer disposed over the light-emitting layer, wherein the first electron-injecting layer includes at least one organic host material having a reduction potential less than ?1.0 V vs. a Saturated Calomel Electrode and at least one dopant material capable of reducing the organic host material. The OLED also includes a second electron-injecting layer disposed in contact with the first electron-injecting layer, wherein the second electron-injecting layer includes at least one organic material having a reduction potential greater than ?1.0 V vs. a Saturated Calomel Electrode, and a cathode disposed over the second electron-injecting layer.Type: GrantFiled: May 6, 2005Date of Patent: December 8, 2009Assignee: Eastman Kodak CompanyInventors: Liang-Sheng Liao, Wojciech K. Slusarek, Michele L. Ricks, Ralph H. Young, Dustin L. Comfort
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Patent number: 7517595Abstract: An OLED device comprises a cathode, an anode, a light emitting layer, and on the cathode side of said emitting layer, a further layer, wherein the further layer is an electron-transporting layer containing: a) a first compound that has the lowest LUMO value of the compounds in the layer, the amount being greater than 40% by volume and less than 100% by volume of the layer; and b) at least one second compound that is a low voltage electron transport material, exhibiting a higher LUMO value than the first compound, the total amount of said compound(s) being less than 60% by volume and more than 0% by volume of the layer.Type: GrantFiled: August 30, 2005Date of Patent: April 14, 2009Assignee: Eastman Kodak CompanyInventors: William J. Begley, Tukaram K. Hatwar, Ralph H. Young, Natasha Andrievsky
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Patent number: 7374828Abstract: Disclosed is an electroluminescent device comprising a cathode and an anode and, located therebetween, a light-emitting layer (LEL) comprising a phosphorescent guest material, a hole- and electron-transporting host material, and an efficiency-enhancing material having an ionization potential lower than that of the host material and a triplet energy level that is lower than that of the phosphorescent guest material by no more than 0.2 eV. Such a device provides useful light emission features.Type: GrantFiled: December 5, 2003Date of Patent: May 20, 2008Assignee: Eastman Kodak CompanyInventors: Marina E. Kondakova, Ralph H. Young
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Patent number: 7288330Abstract: A broadband-emitting OLED device having an anode and a cathode spaced from the anode includes a first light-emitting layer provided over the anode and containing a first host material and a first light-emitting material, wherein the first host material is a mixture of one or more mono-anthracene derivatives and one or more aromatic amine derivatives, wherein the mono-anthracene derivative(s) being provided in a volume fraction range of 5% to 50% relative to the total host volume, and the aromatic amine derivative(s) being provided in a volume fraction range of 50% to 95% relative to the total host volume, and a second light-emitting layer provided over or under the first light-emitting layer.Type: GrantFiled: July 1, 2004Date of Patent: October 30, 2007Assignee: Eaastman Kodak CompanyInventors: Tukaram K. Hatwar, Jeffrey P. Spindler, Ralph H. Young
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Patent number: 7084425Abstract: Disclosed is an electroluminescent device comprising a cathode and an anode; and, located therebetween, a light-emitting layer (LEL) comprising a phosphorescent green-light-emitting material and a host material for the light-emitting material, and in a layer adjacent to the LEL on the anode side, an exciton-blocking layer containing a compound having a hole mobility of at least 1×10?3 cm2V?1s?1 and a triplet energy exceeding that of the green-light-emitting material of the LEL. Such a device provides useful light emission.Type: GrantFiled: December 5, 2003Date of Patent: August 1, 2006Assignee: Eastman Kodak CompanyInventors: Marina E. Kondakova, Ralph H. Young
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Patent number: 7079091Abstract: A method of adjusting the voltage applied across the pixels of an OLED display to compensate for aging including measuring the accumulation of trapped positive charge to produce a signal representative of such accumulation, and responding to such signal to adjust the voltages applied across the pixels of the OLED to compensate for aging.Type: GrantFiled: January 14, 2003Date of Patent: July 18, 2006Assignee: Eastman Kodak CompanyInventors: Denis Y. Kondakov, James R. Milch, Ralph H. Young, James R. Sandifer
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Patent number: 6875524Abstract: Organic light-emitting diodes (OLEDs) that produce white light include an anode, a hole-transporting layer disposed over the anode, a blue light-emitting layer disposed over the hole-transporting layer, an electron-transporting layer disposed over the blue light-emitting layer, and a cathode disposed over the electron-transporting layer. The hole-transporting layer is doped with both a yellow-emitting and a red-emitting dopant. When used together with red, green, and blue color filters, the OLEDs produce red, green, and blue light with good color quality and high efficiency. Also disclosed are multicolor display devices utilizing the OLEDs together with color filters or together with both color filters and liquid-crystal light valves.Type: GrantFiled: August 20, 2003Date of Patent: April 5, 2005Assignee: Eastman Kodak CompanyInventors: Tukaram K. Hatwar, Ralph H. Young, Christopher T. Brown
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Publication number: 20040135749Abstract: A method of adjusting the voltage applied across the pixels of an OLED display to compensate for aging including measuring the accumulation of trapped positive charge to produce a signal representative of such accumulation, and responding to such signal to adjust the voltages applied across the pixels of the OLED to compensate for aging.Type: ApplicationFiled: January 14, 2003Publication date: July 15, 2004Applicant: Eastman Kodak CompanyInventors: Denis Y. Kondakov, James R. Milch, Ralph H. Young, James R. Sandifer
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Patent number: 6727644Abstract: Disclosed are organic electroluminescent devices comprising a substrate, an anode and a cathode disposed over the substrate, an emission layer (EML) disposed between the anode and the cathode, a hole-transport layer (HTL) disposed between the anode and the emission layer, and an electron-transport layer (ETL) disposed between the cathode and the emission layer. The EML and either the HTL, the ETL, or both the HTL and the ETL include a derivative of anthracene as a color-neutral dopant. A color-neutral dopant is a dopant whose presence does not alter the electroluminescent color of the device.Type: GrantFiled: August 6, 2001Date of Patent: April 27, 2004Assignee: Eastman Kodak CompanyInventors: Tukaram K. Hatwar, Ralph H. Young
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Patent number: 6720090Abstract: An organic light emitting device includes a substrate, an anode and a cathode disposed over the substrate; a luminescent layer disposed between the anode and the cathode wherein the luminescent layer includes a host and at least one dopant; the host of the luminescent layer being selected to include a solid organic material comprising a mixture of at least two components wherein the first component of the mixture is an organic compound that is capable of transporting both electrons and holes and that is substantially non-polar; and the second component of the mixture is an organic compound that is more polar than the first component; and the dopant of the luminescent layer being selected to produce light from the light emitting device.Type: GrantFiled: January 2, 2001Date of Patent: April 13, 2004Assignee: Eastman Kodak CompanyInventors: Ralph H. Young, Jianmin Shi, Ching W. Tang
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Patent number: 6692846Abstract: An organic electroluminescent device includes a substrate; an anode and a cathode positioned relative to the substrate; an emission layer disposed between the anode and the cathode; a hole-transport layer disposed between the anode and the emission layer; and an electron-transport layer disposed between the cathode and the emission layer. The hole-transport layer includes two or more sublayers, one sublayer containing a stabilizing dopant, and the sublayer adjacent to the emission layer containing no stabilizing dopant. Alternatively or in addition, the electron-transport layer includes two or more sublayers, one sublayer containing a stabilizing dopant, and the sublayer adjacent to the emission layer containing no stabilizing dopant. The stabilizing dopant includes rubrene or derivatives thereof.Type: GrantFiled: June 20, 2002Date of Patent: February 17, 2004Assignee: Eastman Kodak CompanyInventors: Tukaram K. Hatwar, Ralph H. Young
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Publication number: 20040001968Abstract: An organic electroluminescent device includes a substrate; an anode and a cathode positioned relative to the substrate; an emission layer disposed between the anode and the cathode; a hole-transport layer disposed between the anode and the emission layer; and an electron-transport layer disposed between the cathode and the emission layer. The hole-transport layer includes two or more sublayers, one sublayer containing a stabilizing dopant, and the sublayer adjacent to the emission layer containing no stabilizing dopant. Alternatively or in addition, the electron-transport layer includes two or more sublayers, one sublayer containing a stabilizing dopant, and the sublayer adjacent to the emission layer containing no stabilizing dopant. The stabilizing dopant includes rubrene or derivatives thereof.Type: ApplicationFiled: June 20, 2002Publication date: January 1, 2004Applicant: Eastman Kodak CompanyInventors: Tukaram K. Hatwar, Ralph H. Young
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Patent number: 6565996Abstract: Disclosed are organic electroluminescent devices comprising a substrate, an anode and a cathode disposed over the substrate, an emission layer (EML) disposed between the anode and the cathode, a hole-transport layer (HTL) disposed between the anode and the emission layer, and an electron-transport layer (ETL) disposed between the cathode and the emission layer. A sublayer of the HTL, the ETL, or both the HTL and the ETL comprises a derivative of anthracene as a color-neutral dopant, the sublayer being adjacent to the EML. A color-neutral dopant is a dopant whose presence does not alter the electroluminescent color of the device.Type: GrantFiled: June 6, 2001Date of Patent: May 20, 2003Assignee: Eastman Kodak CompanyInventors: Tukaram K. Hatwar, Ralph H. Young
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Publication number: 20030071565Abstract: Disclosed are organic electroluminescent devices comprising a substrate, an anode and a cathode disposed over the substrate, an emission layer (EML) disposed between the anode and the cathode, a hole-transport layer (HTL) disposed between the anode and the emission layer, and an electron-transport layer (ETL) disposed between the cathode and the emission layer. The EML and either the HTL, the ETL, or both the HTL and the ETL include a derivative of anthracene as a color-neutral dopant. A color-neutral dopant is a dopant whose presence does not alter the electroluminescent color of the device.Type: ApplicationFiled: August 6, 2001Publication date: April 17, 2003Applicant: Eastman Kodak CompanyInventors: Tukaram K. Hatwar, Ralph H. Young
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Publication number: 20030049489Abstract: Disclosed are organic electroluminescent devices comprising a substrate, an anode and a cathode disposed over the substrate, an emission layer (EML) disposed between the anode and the cathode, a hole-transport layer (HTL) disposed between the anode and the emission layer, and an electron-transport layer (ETL) disposed between the cathode and the emission layer. A sublayer of the HTL, the ETL, or both the HTL and the ETL comprises a derivative of anthracene as a color-neutral dopant, the sublayer being adjacent to the EML. A color-neutral dopant is a dopant whose presence does not alter the electroluminescent color of the device.Type: ApplicationFiled: June 6, 2001Publication date: March 13, 2003Applicant: Eastman Kodak CompanyInventors: Tukaram K. Hatwar, Ralph H. Young
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Publication number: 20020127427Abstract: An organic light emitting device includes a substrate, an anode and a cathode disposed over the substrate; a luminescent layer disposed between the anode and the cathode wherein the luminescent layer includes a host and at least one dopant; the host of the luminescent layer being selected to include a solid organic material comprising a mixture of at least two components wherein the first component of the mixture is an organic compound that is capable of transporting both electrons and holes and that is substantially non-polar; and the second component of the mixture is an organic compound that is more polar than the first component; and the dopant of the luminescent layer being selected to produce light from the light emitting device.Type: ApplicationFiled: January 2, 2001Publication date: September 12, 2002Applicant: Eastman Kodak CompanyInventors: Ralph H. Young, Jianmin Shi, Ching W. Tang
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Patent number: 6168911Abstract: The present invention is an imaging element which includes a support, an image-forming layer superposed on the support and an electrically-conductive layer superposed on the support. The electrically-conductive layer includes an electrically-conductive particle having an average particle size less than 0.1 micrometer and a binder, said binder comprising at least 25 weight percent of a polyesterionomer.Type: GrantFiled: December 18, 1998Date of Patent: January 2, 2001Assignee: Eastman Kodak CompanyInventors: Mark Lelental, John M. Noonan, Ralph H. Young
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Patent number: 5618950Abstract: A sulfone charge transport agent and a multilayered electrophotographic element in which at least one of said layers includes polymeric binder and the sulfone charge transport agent. The general structure of the charge transport agent is: ##STR1## R is alkyl or cycloalkyl having from 1 to about 10 carbons, or aryl or heteroaryl having a total of carbons and heteroatoms of from 6 to about 12. T is alkyl having from 1 to 4 carbons.Type: GrantFiled: September 27, 1995Date of Patent: April 8, 1997Assignee: Eastman Kodak CompanyInventors: Michael R. Detty, John A. Sinicropi, J. Robin Cowdery-Corvan, Ralph H. Young