Patents by Inventor Tukaram K. Hatwar
Tukaram K. Hatwar 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: 8420229Abstract: An OLED device comprising a cathode, an anode, and having therebetween a light emitting layer and an electron-injecting layer, where (a) the light emitting layer contains a host and up to 50 volume % of a light-emitting fluoranthene compound with a 7,10-diaryl substituted fluoranthene nucleus having no aromatic rings annulated to the fluoranthene nucleus; and (b) the electron-injecting layer being located between the cathode and the light-emitting layer contains an organic alkali metal compound. It provides reduced drive voltage, operational stability and luminance of OLED devices.Type: GrantFiled: October 26, 2007Date of Patent: April 16, 2013Assignee: Global OLED Technologies LLCInventors: William J. Begley, Tukaram K. Hatwar, Natasha Andrievsky
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Patent number: 8283054Abstract: A white-light-emitting tandem OLED device having spaced anode and cathode including: first and second light-emitting units disposed between the anode and cathode; an intermediate connector including an n-type layer and a p-type layer disposed between the first and second light-emitting units; and a fluoranthene-containing electron-transporting layer adjacent to the n-type layer of the intermediate connector and including at least 25% of a 7,10-diaryl-substituted fluoranthene compound having no aromatic rings annulated to the fluoranthene nucleus.Type: GrantFiled: April 3, 2009Date of Patent: October 9, 2012Assignee: Global OLED Technology LLCInventors: Jeffrey P. Spindler, Tukaram K. Hatwar, William J. Begley
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Patent number: 8179035Abstract: A method for selecting two different light-emitting materials for use in an OLED device, each of which produces different color light, which combine to produce white light. Each light emitting material has its own point on a chromaticity diagram, and the light-emitting materials are selected such that, when a line is drawn between the first point and the second point, it passes through a desired white area defined on a chromaticity diagram.Type: GrantFiled: December 19, 2007Date of Patent: May 15, 2012Assignee: Global OLED Technology LLCInventors: Jeffrey P. Spindler, Tukaram K. Hatwar, Michele L. Ricks
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Patent number: 8174182Abstract: A method for selecting two different light-emitting materials for use in an OLED device, each of which produces different color light, which combine to produce white light. Each light emitting material has its own point on a chromaticity diagram, and the light-emitting materials are selected such that, when a line is drawn between the first point and the second point, it passes through a desired white area defined on a chromaticity diagram.Type: GrantFiled: November 17, 2004Date of Patent: May 8, 2012Assignee: Global OLED Technology LLCInventors: Jeffrey P. Spindler, Tukaram K. Hatwar, Michele L. Ricks
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Patent number: 8057917Abstract: An OLED device comprising, in sequence, an anode, a light-emitting layer that comprises a phosphorescent light-emitting organometallic compound, a hole-blocking layer, and a cathode, and between the hole-blocking layer and the cathode, a further layer containing a mixture of a first compound that is a tetracene compound that has the lowest LUMO value of the compounds in the layer, in an amount greater than or equal to 10% and less than 90% and a second compound that is a low voltage electron transport material, exhibiting a higher LUMO value than the first compound in an amount less than or equal to 90% and more than 10%.Type: GrantFiled: May 16, 2008Date of Patent: November 15, 2011Assignee: Global OLED Technology LLCInventors: William J. Begley, Tukaram K. Hatwar, Joseph C. Deaton, Christopher T. Brown, Natasha Andrievsky, Marina E. Kondakova
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Patent number: 8057916Abstract: An OLED device includes an anode, a cathode, and at least one individually selected organic light-emitting layer disposed between the anode and cathode. The device also includes an electron-transporting layer disposed between the at least one light-emitting layer and the cathode, such electron-transporting layer including a first electron-transporting material, and an electron-injecting layer disposed between the electron-transporting layer and the cathode, such electron-injecting layer including a metal dopant having a work function less than 4.0 eV and an electron-transporting material that is different from the first electron-transporting material.Type: GrantFiled: April 20, 2005Date of Patent: November 15, 2011Assignee: Global OLED Technology, LLC.Inventors: Tukaram K. Hatwar, Liang-Sheng Liao, Yuan-Sheng Tyan, Steven A. Van Slyke
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Patent number: 7977872Abstract: An OLED device having two spaced electrodes including: first, second, and third light-emitting units disposed between the electrodes, the first light-emitting unit produces light that has multiple peaks at wavelengths longer than 500 nm and substantially no emission at wavelengths shorter than 480 nm, and the second and third light-emitting units produce light that has substantial emission at wavelengths shorter than 500 nm; intermediate connectors respectively disposed between the first and second light-emitting units, and between the second and third light-emitting units; and wherein the OLED device emits light with a color temperature greater than 7,000K.Type: GrantFiled: September 16, 2008Date of Patent: July 12, 2011Assignee: Global OLED Technology LLCInventors: Jeffrey P. Spindler, Tukaram K. Hatwar
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Patent number: 7955719Abstract: A tandem OLED device including an anode; a cathode; at least two electroluminescent units disposed between the anode and the cathode, wherein each of the electroluminescent units includes at least one hole-transporting layer and one organic light-emitting layer; and an intermediate connector disposed between adjacent electroluminescent units, wherein the intermediate connector includes an n-doped organic layer and an electron-accepting layer, the electron-accepting layer being disposed closer to the cathode than the n-doped organic layer, and wherein the n-doped organic layer includes an alkali metal and an organic alkali metal complex.Type: GrantFiled: January 30, 2008Date of Patent: June 7, 2011Assignee: Global OLED Technology LLCInventors: Tukaram K. Hatwar, Jeffrey P. Spindler, William J. Begley
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Patent number: 7948165Abstract: A tandem OLED device having two spaced electrodes comprising: first and second light-emitting units that produce different emission spectra disposed between the electrodes, the first light-emitting unit produces light that has multiple peaks at wavelengths longer than 500 nm and substantially no emission at wavelengths shorter than 480 nm, and the second light-emitting unit produces light that has substantial emission at wavelengths shorter than 500 nm; and an intermediate connector disposed between the light-emitting units.Type: GrantFiled: May 9, 2007Date of Patent: May 24, 2011Assignee: Global OLED Technology LLCInventors: Jeffrey P. Spindler, Tukaram K. Hatwar
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Publication number: 20110018429Abstract: The invention provides an OLED device including an anode, a cathode and a yellow light-emitting layer located therebetween, the light-emitting layer comprising a 9,10-diarylanthracene host; a yellow light-emitting 5,6,11,12-tetraphenyltetracene derivative where as least 1 of the phenyl groups is further substituted and a non-light-emitting diarylamine substituted 9,10-diarylsubstituted anthracene stabuilizer. Devices of the invention provide improvement in features such as stability and efficiency while maintaining excellent color.Type: ApplicationFiled: July 22, 2009Publication date: January 27, 2011Inventors: Jeffrey P. Spindler, Tukaram K. Hatwar
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Publication number: 20100288362Abstract: The invention provides an electronic device including an anode and a cathode, between which there are at least two organic phototransducing units where the units are separated by an intermediate connecting region which comprises in sequence: an organic p-type layer, an intermediate layer in direct contact with the organic p-type layer and including a compound that has a LUMO more negative than ?3.0 eV and is different from the organic compound in the organic p-type layer, and an n-type doped organic layer in direct contact with the intermediate layer and including an electron transport material as a host and an organic n-dopant with a HOMO less negative than ?4.5 eV. In one embodiment, the electronic device is a tandem OLED.Type: ApplicationFiled: May 13, 2009Publication date: November 18, 2010Inventors: Tukaram K. Hatwar, Jeffrey P. Spindler, Denis Y. Kondakov, Steven A. Van Slyke, Sven Z. Murano, Gufeng He
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Patent number: 7821201Abstract: A tandem OLED device including an anode; a cathode; at least two electroluminescent units disposed between the anode and the cathode, wherein each of the electroluminescent units includes at least one hole-transporting layer and one organic light-emitting layer; and an intermediate connector of at least two layers disposed between adjacent electroluminescent units, wherein the intermediate connector includes an organic alkali metal complex layer and an organic electron-accepting layer, the organic electron-accepting layer being disposed closer to the cathode than the organic alkali metal complex layer, and there is present metallic aluminum in the organic alkali metal complex layer.Type: GrantFiled: January 31, 2008Date of Patent: October 26, 2010Assignee: Global OLED Technology LLCInventors: Tukaram K. Hatwar, Jeffrey P. Spindler, William J. Begley
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Patent number: 7816859Abstract: A tandem white light-emitting OLED device is disclosed comprising a spaced anode and cathode, a light reflector associated with either the anode or the cathode, and at least two white light emitting units. The first white light-emitting unit has a set of at least two emission peaks in the blue and yellow spectral regions that are more intense than any other emission peaks that may be present in the emission spectrum of the first white light-emitting unit. The second white light-emitting unit is disposed closer to the reflector than the first white light-emitting unit and includes a set of at least three emission peaks in the blue, green, and red spectral regions that are more intense than any other emission peaks that may be present in the emission spectrum of the second white light-emitting unit. An intermediate connector is disposed between the first and second white light-emitting units.Type: GrantFiled: April 30, 2007Date of Patent: October 19, 2010Assignee: Global OLED Technology LLCInventors: Jeffrey P. Spindler, Tukaram K. Hatwar
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Publication number: 20100253209Abstract: A white-light-emitting tandem OLED device having spaced anode and cathode including: first and second light-emitting units disposed between the anode and cathode; an intermediate connector including an n-type layer and a p-type layer disposed between the first and second light-emitting units; and a fluoranthene-containing electron-transporting layer adjacent to the n-type layer of the intermediate connector and including at least 25% of a 7,10-diaryl-substituted fluoranthene compound having no aromatic rings annulated to the fluoranthene nucleus.Type: ApplicationFiled: April 3, 2009Publication date: October 7, 2010Inventors: Jeffrey P. Spindler, Tukaram K. Hatwar, William J. Begley
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Patent number: 7767317Abstract: An OLED device comprises a cathode, a light emitting layer and an anode, in that order, and, having located between the cathode and the light emitting layer, a further layer containing; (a) 10 vol % or more of a carbocyclic fused ring aromatic compound, and (b) a cyclometallated complex represented by Formula (4?) wherein: Z and the dashed arc represent two or three atoms and the bonds necessary to complete a 5- or 6-membered ring with M; each A represents H or a substituent and each B represents an independently selected substituent on the Z atoms, provided that two or more substituents may combine to form a fused ring or a fused ring system; j is 0-3 and k is 1 or 2; M represents a Group IA, IIA, IIIA and IIB element of the Periodic Table; and m and n are independently selected integers selected to provide a neutral charge on the complex; and provided that the complex does not contain the 8-hydroxyquinolate ligand. Such devices exhibit reduce drive voltage while maintaining good luminance.Type: GrantFiled: October 26, 2005Date of Patent: August 3, 2010Assignee: Global OLED Technology LLCInventors: William J. Begley, Manju Rajeswaran, Tukaram K. Hatwar, Natasha Andrievsky
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Patent number: 7719180Abstract: An inverted OLED device, comprising: a substrate; a cathode disposed on the substrate; an anode spaced from the cathode; at least one light-emitting layer disposed between the anode and the cathode; a hole-transporting layer disposed between the anode and the light-emitting layer(s); an electron-transporting layer disposed between the cathode and the light-emitting layer(s); a first electron-accepting layer disposed between the hole-transporting layer and the anode and including a first electron-deficient organic material constituting more than 50% by volume of the first electron-accepting layer and having a reduction potential greater than ?0.5 V vs. a Saturated Calomel Electrode; and a second electron-accepting layer disposed between the electron-transporting layer and the cathode including a second electron-deficient organic material constituting more than 50% by volume of the second electron-accepting layer and having a reduction potential greater than ?0.5 V vs. a Saturated Calomel Electrode.Type: GrantFiled: October 16, 2007Date of Patent: May 18, 2010Assignee: Global OLED Technology LLCInventors: Jeffrey P. Spindler, Tukaram K. Hatwar
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Publication number: 20100084647Abstract: An OLED device comprises a cathode, an anode, and has therebetween a light emitting layer (LEL) comprising a phosphorescent emitting compound disposed in a host comprising a mixture of at least one electron transporting co-host which is a benzophenone derivative with a spiro substituent and at least one hole transporting co-host which is a triphenylamine which contains one trivalent nitrogen atom that is bonded only to carbon atoms, at least one of which is a member of an aromatic ring, wherein there is present an electron transporting layer contiguous to the LEL (HBL?) on the cathode side comprising an anthracene or a fluoranthene and wherein there is present an election injecting layer comprising a phenanthroline or a lithium quinolate contiguous to the cathode.Type: ApplicationFiled: December 9, 2009Publication date: April 8, 2010Inventors: MARINA E. KONDAKOVA, Denis Y. Kondakov, Christopher T. Brown, Tukaram K. Hatwar, Jeffrey P. Spindler
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Publication number: 20100066239Abstract: An OLED device having two spaced electrodes including: first, second, and third light-emitting units disposed between the electrodes, the first light-emitting unit produces light that has multiple peaks at wavelengths longer than 500 nm and substantially no emission at wavelengths shorter than 480 nm, and the second and third light-emitting units produce light that has substantial emission at wavelengths shorter than 500 nm; intermediate connectors respectively disposed between the first and second light-emitting units, and between the second and third light-emitting units; and wherein the OLED device emits light with a color temperature greater than 7,000K.Type: ApplicationFiled: September 16, 2008Publication date: March 18, 2010Inventors: Jeffrey P. Spindler, Tukaram K. Hatwar
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Patent number: 7662485Abstract: An organic light-emitting diode (OLED) device produces white light, includes a) an anode; b) a hole-transporting layer disposed over the anode; c) a blue light-emitting layer disposed over the hole-transporting layer; d) an electron-transporting layer disposed over the blue light-emitting layer; e) a cathode disposed over the electron-transporting layer; wherein the hole-transporting layer comprises an entire layer or a partial portion of a layer in contact with the blue light-emitting layer and contains a light-emitting naphthacene compound having a specified formula.Type: GrantFiled: March 16, 2004Date of Patent: February 16, 2010Assignee: Eastman Kodak CompanyInventors: William J. Begley, Tukaram K. Hatwar, Manju Rajeswaran, Natasha Andrievsky
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Publication number: 20100019671Abstract: An OLED device including a cathode, a light emitting layer and an anode, in that order, and, having located between the cathode and the light emitting layer, a further layer containing an alkali metal or alkaline earth metal salt of a 2-(2-hydroxyphenyl)phenanthroline derivative. Such devices exhibit reduced drive voltage while maintaining good luminance.Type: ApplicationFiled: October 5, 2009Publication date: January 28, 2010Inventors: William J. Begley, Tukaram K. Hatwar, Liang-Sheng Liao, Kevin P. Klubek, Manju Rajeswaran, Natasha Andrievsky