Patents by Inventor Venkataramanan Seshadri
Venkataramanan Seshadri 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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Publication number: 20140284573Abstract: Compositions for use in hole transporting layers (HTLs) or hole injection layers (HILs) are provided, as well as methods of making the compositions and devices fabricated from the compositions. OLED devices can be made. The compositions comprise at least one conductive conjugated polymer, at least one semiconducting matrix component that is different from the conductive conjugated polymer, and an optional dopant, and are substantially free of an insulating matrix component.Type: ApplicationFiled: March 14, 2014Publication date: September 25, 2014Applicant: PLEXTRONICS, INC.Inventors: Christopher T. BROWN, Mathew K. MATHAI, Venkataramanan SESHADRI
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Patent number: 8828274Abstract: Polymers comprising a backbone comprising at least one arylamine repeat moiety and at least one linking moiety, wherein the linking moiety does not comprise an aryl moiety. Ink formulations and organic electronic devices such as OLEDs or OPVs can be formed from the polymers and doped polymers. The polymers can be used in a hole injection layer, hole transport layer, a hole extraction layer, or as a host material in an emissive layer. Improved stability can be achieved in organic electronic devices such as OLEDs and OPVs.Type: GrantFiled: October 26, 2009Date of Patent: September 9, 2014Assignee: Solvay USA, Inc.Inventors: Jessica Benson-Smith, Christopher T. Brown, Venkataramanan Seshadri, Jing Wang
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Patent number: 8815639Abstract: A composition comprising: at least one compound comprising a hole transporting core, wherein the core is covalently bonded to a first arylamine group and also covalently bonded to a second arylamine group different from the first, and wherein the compound is covalently bonded to at least one intractability group, wherein the intractability group is covalently bonded to the hole transporting core, the first arylamine group, the second arylamine group, or a combination thereof, and wherein the compound has a molecular weight of about 5,000 g/mole or less. Blended mixtures of arylamine compounds, including fluorene core compounds, can provide good film formation and stability when coated onto hole injection layers. Solution processing of OLEDs is a particularly important application.Type: GrantFiled: April 23, 2013Date of Patent: August 26, 2014Assignee: Solvay USA, Inc.Inventors: Christopher T. Brown, Neetu Chopra, Christopher Knittel, Mathew Mathai, Venkataramanan Seshadri, Jing Wang, Brian Woodworth
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Publication number: 20140217334Abstract: Compositions comprising at least one hole transport material, such as a conjugated polymer, and at least one dopant, providing improved thermal stability. Compositions can be applied to substrates and used in HIL and HTL layers and organic electronic devices such as light emitting devices such as OLEDs or OPVs. The conjugated polymer can be a polythiophene, including a 3,4-substituted polythiophene or a regioregular polythiophene. The dopant can be a silver salt such as silver tetrakis(pentafluorophenyl)borate. Improved methods of making dopant are provided.Type: ApplicationFiled: February 10, 2014Publication date: August 7, 2014Applicant: Plextronics, Inc.Inventors: Christopher T. BROWN, Mark A. Bower, Venkataramanan Seshadri
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Patent number: 8791451Abstract: A composition comprising: at least one conjugated polymer, at least one second polymer comprising repeat units represented by: (I) optionally, —[CH2—CH(Ph-OH)]— and (II) —[CH2—CH(Ph-OR)]— wherein Ph is a phenyl ring and R comprises a fluorinated group, an alkyl group, an alkylsulfonic acid group, an alkylene oxide group, or a combination thereof is described. Other polymers can be used as second polymer including polymers comprising modified naphthol side groups. The composition can be used in hole injection and hole transport layers for organic electronic devices. Increased lifetime and better processability can be achieved. Versatility with useful OLED emitters can be achieved. Ink formulations can be adapted for ink jet printing. The conjugated polymer can be a polythiophene. Applications include OLEDs and OPVs.Type: GrantFiled: March 5, 2009Date of Patent: July 29, 2014Assignee: Solvay USA, Inc.Inventors: Venkataramanan Seshadri, Christopher T. Brown, Brian E. Woodworth, Edward S. Yang
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Patent number: 8716706Abstract: Compositions for use in hole transporting layers (HTLs) or hole injection layers (HILs) are provided, as well as methods of making the compositions and devices fabricated from the compositions. OLED devices can be made. The compositions comprise at least one conductive conjugated polymer, at least one semiconducting matrix component that is different from the conductive conjugated polymer, and an optional dopant, and are substantially free of an insulating matrix component.Type: GrantFiled: January 29, 2013Date of Patent: May 6, 2014Assignee: Plextronics, Inc.Inventors: Christopher T. Brown, Mathew K. Mathai, Venkataramanan Seshadri
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Patent number: 8709291Abstract: Use of certain materials in hole injection layer and/or hole transport layer can improve operational lifetimes in organic devices. Polymers having fused aromatic side groups such as polyvinylnaphthol polymers can be used in conjunction with conjugated polymers. Inks can be formulated and cast as films in organic electronic devices including OLEDs, SMOLEDs, and PLEDs. One embodiment provides a composition comprising: at least one conjugated polymer, and at least one second polymer different from the conjugated polymer comprising at least one optionally substituted fused aromatic hydrocarbon side group. The substituent can be hydroxyl. Aqueous-based inks can be formulated.Type: GrantFiled: April 25, 2012Date of Patent: April 29, 2014Assignee: Plextronics, Inc.Inventors: Christopher T. Brown, Venkataramanan Seshadri
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Patent number: 8674047Abstract: Compositions comprising at least one hole transport material, such as a conjugated polymer, and at least one dopant, providing improved thermal stability. Compositions can be applied to substrates and used in HIL and HTL layers and organic electronic devices such as light emitting devices such as OLEDs or OPVs. The conjugated polymer can be a polythiophene, including a 3,4-substituted polythiophene or a regioregular polythiophene. The dopant can be a silver salt such as silver tetrakis(pentafluorophenyl)borate. Improved methods of making dopant are provided.Type: GrantFiled: May 10, 2011Date of Patent: March 18, 2014Assignee: Plextronics, Inc.Inventors: Christopher T. Brown, Mark A. Bower, Venkataramanan Seshadri
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Patent number: 8535974Abstract: A composition comprising: at least one compound comprising a hole transporting core, wherein the core is covalently bonded to a first arylamine group and also covalently bonded to a second arylamine group different from the first, and wherein the compound is covalently bonded to at least one intractability group, wherein the intractability group is covalently bonded to the hole transporting core, the first arylamine group, the second arylamine group, or a combination thereof, and wherein the compound has a molecular weight of about 5,000 g/mole or less. Blended mixtures of arylamine compounds, including fluorene core compounds, can provide good film formation and stability when coated onto hole injection layers. Solution processing of OLEDs is a particularly important application.Type: GrantFiled: July 1, 2011Date of Patent: September 17, 2013Assignee: Plextronics, Inc.Inventors: Christopher T. Brown, Neetu Chopra, Christopher R. Knittel, Mathew Mathai, Venkataramanan Seshadri, Jing Wang, Brian Woodworth
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Patent number: 8519424Abstract: Mosaic devices including an apparatus includes at least one electroluminescence (EL) device and a system substrate. The at least one EL device can be configured to be coupled mechanically and electrically to the system substrate. The system substrate can be configured to receive the at least one EL device at a non-discrete location or orientation. The system substrate can be a smart system substrate configured to automatically identify a device type. The EL device can be an area-emitting device such as an organic light emitting diode (OLED) device.Type: GrantFiled: August 18, 2009Date of Patent: August 27, 2013Assignee: Plextronics, Inc.Inventors: Troy D. Hammond, Lisa Pattison, Venkataramanan Seshadri
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Patent number: 8399604Abstract: Conducting polymer systems for hole injection or transport layer applications including a composition comprising: a water soluble or water dispersible regioregular polythiophene comprising (i) at least one organic substituent, and (ii) at least one sulfonate substituent comprising sulfonate sulfur bonding directly to the polythiophene backbone. The polythiophene can be water soluble, water dispersible, or water swellable. They can be self-doped. The organic substituent can be an alkoxy substituent, or an alkyl substituent. OLED, PLED, SMOLED, PV, and ESD applications can be used.Type: GrantFiled: August 12, 2011Date of Patent: March 19, 2013Assignee: Plextronics, Inc.Inventors: Venkataramanan Seshadri, Brian E. Woodworth, Christopher Greco, Darin Laird, Mathew K. Mathai
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Patent number: 8383454Abstract: Compositions for use in hole transporting layers (HTLs) or hole injection layers (HILs) are provided, as well as methods of making the compositions and devices fabricated from the compositions. OLED devices can be made. The compositions comprise at least one conductive conjugated polymer, at least one semiconducting matrix component that is different from the conductive conjugated polymer, and an optional dopant, and are substantially free of an insulating matrix component.Type: GrantFiled: December 9, 2011Date of Patent: February 26, 2013Assignee: Plextronics, Inc.Inventors: Chris T. Brown, Matthew K. Mathai, Venkataramanan Seshadri
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Publication number: 20130023621Abstract: Copolymers of 3,4-dialkoxythiophenes are disclosed that are useful as electronics materials. Also disclosed are methods of making these copolymers, as well as compositions and devices incorporating them. Use of these materials in hole injection or hole transport layers is disclosed. Materials comprising these copolymers can be designed to provide solubility in some solvents and intractability in others, which is useful for the construction of multilayer materials for use in electronic devices.Type: ApplicationFiled: December 17, 2010Publication date: January 24, 2013Inventors: Venkataramanan Seshadri, Elena E. Sheina
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Publication number: 20130009137Abstract: Improved OLED devices and methods of making the same using vertical phase separation to simplify processing. Vertically phase separated material can include at least one lower first layer disposed on the electrode, and at least one upper second layer different from the first layer and disposed away from the electrode or optionally on one layer comprising at least one semiconducting organic material. The first layer can be enriched with at least one first semiconducting organic material (SOM 1) and the second layer can be enriched with at least one second semiconducting organic material (SOM 2) different from the SOM 1. The ink composition can be adapted so that the film vertically phase separates into the first and second layers. Compositions and devices are also embodied herein.Type: ApplicationFiled: June 29, 2012Publication date: January 10, 2013Inventors: Christopher T. Brown, Neetu Chopra, Venkataramanan Seshadri, Jing Wang
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Publication number: 20120277367Abstract: Use of certain materials in hole injection layer and/or hole transport layer can improve operational lifetimes in organic devices. Polymers having fused aromatic side groups such as polyvinylnaphthol polymers can be used in conjunction with conjugated polymers. Inks can be formulated and cast as films in organic electronic devices including OLEDs, SMOLEDs, and PLEDs. One embodiment provides a composition comprising: at least one conjugated polymer, and at least one second polymer different from the conjugated polymer comprising at least one optionally substituted fused aromatic hydrocarbon side group. The substituent can be hydroxyl. Aqueous-based inks can be formulated.Type: ApplicationFiled: April 25, 2012Publication date: November 1, 2012Inventors: Christopher T. Brown, Venkataramanan Seshadri
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Patent number: 8187501Abstract: Use of certain materials in hole injection layer and/or hole transport layer can improve operational lifetimes in organic devices. Polymers having fused aromatic side groups such as polyvinylnaphthol polymers can be used in conjunction with conjugated polymers. Inks can be formulated and cast as films in organic electronic devices including OLEDs, SMOLEDs, and PLEDs. One embodiment provides a composition comprising: at least one conjugated polymer, and at least one second polymer different from the conjugated polymer comprising at least one optionally substituted fused aromatic hydrocarbon side group. The substituent can be hydroxyl. Aqueous-based inks can be formulated.Type: GrantFiled: February 27, 2009Date of Patent: May 29, 2012Assignee: Plextronics, Inc.Inventors: Christopher T. Brown, Venkataramanan Seshadri
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Publication number: 20120097898Abstract: Disclosed are methods of dispersing sulfonated polythiophenes in a non-aqueous solvent including replacing water for organic solvent without precipitation of the polythiophene. Once dispersed in a non-aqueous solvent, the sulfonated polythiophene can be mixed with a matrix polymer. The materials can be used in organic electronic devices including OLEDs and OPVs. The solvent processes can improve the viscosity properties. Sulfonated regioregular polythiophenes can be used. A benefit is improved solvent compatibility in building organic electronic devices and improved ability to formulate with matrix materials.Type: ApplicationFiled: April 30, 2010Publication date: April 26, 2012Inventors: Venkataramanan Seshadri, Edward Yang
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Publication number: 20120083070Abstract: Compositions for use in hole transporting layers (HTLs) or hole injection layers (HILs) are provided, as well as methods of making the compositions and devices fabricated from the compositions. OLED devices can be made. The compositions comprise at least one conductive conjugated polymer, at least one semiconducting matrix component that is different from the conductive conjugated polymer, and an optional dopant, and are substantially free of an insulating matrix component.Type: ApplicationFiled: December 9, 2011Publication date: April 5, 2012Inventors: Mathew K. Mathai, Christopher T. Brown, Venkataramanan Seshadri
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Publication number: 20120037852Abstract: Conducting polymer systems for hole injection or transport layer applications including a composition comprising: a water soluble or water dispersible regioregular polythiophene comprising (i) at least one organic substituent, and (ii) at least one sulfonate substituent comprising sulfonate sulfur bonding directly to the polythiophene backbone. The polythiophene can be water soluble, water dispersible, or water swellable. They can be self-doped. The organic substituent can be an alkoxy substituent, or an alkyl substituent. OLED, PLED, SMOLED, PV, and ESD applications can be used.Type: ApplicationFiled: August 12, 2011Publication date: February 16, 2012Inventors: Venkataramanan SESHADRI, Brian E. Woodworth, Christopher Greco, Darin Laird, Mathew K. Mathai
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Patent number: 8097876Abstract: Compositions for use in hole transporting layers (HTLs) or hole injection layers (HILs) are provided, as well as methods of making the compositions and devices fabricated from the compositions. OLED devices can be made. The compositions comprise at least one conductive conjugated polymer, at least one semiconducting matrix component that is different from the conductive conjugated polymer, and an optional dopant, and are substantially free of an insulating matrix component.Type: GrantFiled: October 26, 2009Date of Patent: January 17, 2012Assignee: Plextronics, Inc.Inventors: Mathew K. Mathai, Christopher T. Brown, Venkataramanan Seshadri