Patents by Inventor Mohammad Khaja
Mohammad Khaja 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: 9269912Abstract: Disclosed is a metal complex having a partial structure represented by the following Formula (I-0) or a tautomer thereof: formula (I-0) Cy is a 5 to 7 membered heterocyclic ring, preferably a 6-membered ring, which may be aromatic, non aromatic or partially aromatic and which coordinates to the metal atom through a carbon atom; A is a nitrogen atom a is an integer equal or superior to 1; D is an electron donor group; and b is an integer equal or superior to 1.Type: GrantFiled: November 21, 2011Date of Patent: February 23, 2016Assignee: SOLVAY SAInventors: Michael Graetzel, Etienne David Baranoff, Mohammad Khaja Nazeeruddin
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Publication number: 20150303394Abstract: An organic electroluminescent device includes a substrate, a first electrode arranged on the substrate, and a functional organic layer arranged on the first electrode. The functional organic layer is adapted to emit electromagnetic radiation A second electrode is arranged on the functional organic layer. The functional organic layer includes a matrix material and an emitter material. The emitter material is neutral or ionically charged. The emitter material is selected from the group of ionic transition metal complex, neutral transition metal complex, polymer emitter and combinations thereof, wherein the matrix material comprises at least one ionic charge carrier transporting material, wherein the ionic charge carrier transporting material is selected from the group of electron-transporting material, hole-transporting material, ambipolar-transporting material and combinations thereof, and wherein the at least one ionic charge carrier transporting material is ionically charged.Type: ApplicationFiled: November 18, 2013Publication date: October 22, 2015Inventors: Frank Vollkommer, Jürgen Bauer, Wiebke Sarfert, Sebastian Meier, David Hartmann, Etienne Baranoff, Mohammad Khaja Nazeeruddin, Nail Malikovich Shavaleev, Edwin Constable, David Vonlanthen, Hendrik Jan Bolink, Daniel Tordera Salvador, Antonio Pertegas Ojeda, Manuel Delgado, Enrique Orti
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Publication number: 20150213966Abstract: The present invention relates to compounds of formula (I) based on DPP moiety being useful as metal-free organic sensitizers or dyes of type D-?-A in electrochemical or optoelectronic devices, their use as sensitizer or dye and an electrochemical or optoelectronic device comprising a compound of the invention.Type: ApplicationFiled: August 14, 2013Publication date: July 30, 2015Inventors: Thomas Wesley Holcombe, Jun Ho Yum, Mohammad Khaja Nazeeruddin, Michael Graetzel
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Publication number: 20150200377Abstract: The present invention provides a solid state heterojunction solar cell comprising a transparent conducting support layer (2,3), on which a nanostructured, surface-increasing scaffold structure is provided, wherein an organic-inorganic perovskite layer (4) is provided on said scaffold structure, and wherein a counter electrode and/or metal layer (5) is provided in electric contact with said perovskite layer (4). According to an embodiment, the solar cell lacks an electrolyte or any hole conducting material. The invention also relates to a solid state ' heterojunction and to a method of preparing the solar cell.Type: ApplicationFiled: July 24, 2013Publication date: July 16, 2015Applicant: Ecole Polytechnique Federale de Lausanne (EPFL)Inventors: Lioz Etgar, Mohammad Khaja Nazeeruddin, Michael Graetzel
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Patent number: 8980440Abstract: This invention pertains to light emitting materials comprising novel ortho-metalated transition metal complexes [C^N]2M(T)(L), comprising chelate dialkylamino-substituted C^N ligands, monodentate neutral ligand (L) having sp2 hybridized N atom and a monodentate anionic ligand (T) chosen among CN?, CNO?, CNS?. It has been surprisingly found that when the metal has bound thereto in addition to substituted orthometalated ligands, both an anion chosen among cyanide, thiocyanate, cyanate, possessing strong C donor and ? acceptor properties, and a monodentate neutral ligand L, as above defined, said ligands advantageously participate in the emission process, significantly shifting emission towards higher energies (blue-shift) and enabling appreciable improvement of the emission efficiency of complexes [C^N]2M(T)(L). Still objects of the invention are the use of said light emitting materials and organic light emitting device comprising said light emitting material.Type: GrantFiled: April 3, 2007Date of Patent: March 17, 2015Assignee: Solvay (Societe Anonyme)Inventors: Mohammad Khaja Nazeeruddin, Cedric Klein, Michael Graetzel
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Publication number: 20140332079Abstract: The present invention provides a porous semiconductor electrode passivated by way of a layer applied by an atomic layer deposition (ALD) process. The semiconductor electrode can be advantageously used in dye-sensitized solar cells (DSCs) having increase open current voltages (Voc). By selecting the thickness and the material of the passivating or blocking layer, high Voc without substantial reduction of short circuit current (JSC) is achieved, thereby resulting in devices exhibiting excellent power conversion efficiencies.Type: ApplicationFiled: December 8, 2011Publication date: November 13, 2014Inventors: Aravind Kumar Chandiran, Mohammad Khaja Nazeeruddin, Michael Graetzel
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Publication number: 20140239288Abstract: The invention relates to substituted ullazine and analogs of ullazine as sensitizers for dye-sensitized solar cells (DSSCs) and other photoelectrochemical and/or optoelectronic devices. The sensitizers may comprise donor substituents and/or acceptor substituents, besides an anchoring group suitable for attaching the sensitizer on a semiconductor surface. DSSCs based on this type of sensitizers exhibit high power conversion efficiencies.Type: ApplicationFiled: October 18, 2011Publication date: August 28, 2014Applicant: Ecole Polytechnique Féderale de Lausanne (EPFL)Inventors: Jared Delcamp, Michael Graetzel, Mohammad Khaja Nazeeruddin
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Publication number: 20140060641Abstract: The present invention provides an improved redox couple for electrochemical and optoelectronic devices. The redox couple is based on a complex of a first row transition metal, said complex containing at least one mono-, bi-, or tridentate ligand comprising a substituted or unsubstituted ring or ring system comprising a five-membered N-containing heteroring and/or a six-membered ring comprising at least two heteroatoms, at least one of which being a nitrogen atom, said five- or six-membered heteroring, respectively, comprising at least one double bond. The invention also relates to electrolytes and to the devices containing the complex, and to the use of the complex as a redox couple. The invention further provides electrochemical and/or optoelectronic devices comprising a first and a second electrode and, between said first and second electrode, a charge transport layer, said a charge transport layer comprising tetracyanoborate ([B(CN)4]?) and a cationic metal complex functioning as redox-couple.Type: ApplicationFiled: February 24, 2012Publication date: March 6, 2014Applicant: Ecole Polytechnique Federale de LausanneInventors: Mohammad Khaja Nazeeruddin, Michael Graetzel, Etienne Baranoff, Florian Kessler, Jun-Ho Yum, Aswani Yella, Hoi Nok Tsao, Shaik Mohammad Zakeeruddin
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Patent number: 8663821Abstract: Light emitting materials comprising multinuclear metal complexes comprising at least two metal atoms and a metal bridging ligand bound to said at least two metal atoms. It relates more particularly to a multinuclear complex of Formula (I): {-[L]2M-B-}n, wherein L is a bidentate ligand; M represents a transition metal having an atomic number of at least 40, and each M can be the same or different at each occurrence; B is a 2-connecting short metal bridging ligand bound to said at least two metal atoms, where the metal bridging ligand comprises coordinating atoms independently selected from the group consisting of nitrogen, phosphorous, carbon, oxygen, sulphur and selenium in 1,2 or 1,3 mutual position. (1,2-? or 1,3-? bonding mode); and n is an integer larger than 1.Type: GrantFiled: July 15, 2009Date of Patent: March 4, 2014Assignee: Solvay SAInventors: Etienne David Baranoff, Mohammad Khaja Nazeeruddin, Michael Graetzel
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Publication number: 20140005397Abstract: Disclosed is a metal complex having a partial structure represented by the following Formula (I-0) or a tautomer thereof: formula (I-0) Cy is a 5 to 7 membered heterocyclic ring, preferably a 6-membered ring, which may be aromatic, non aromatic or partially aromatic and which coordinates to the metal atom through a carbon atom; A is a nitrogen atom a is an integer equal or superior to 1; D is an electron donor group; and b is an integer equal or superior to 1.Type: ApplicationFiled: November 21, 2011Publication date: January 2, 2014Applicant: SOLVAY SAInventors: Michael Graetzel, Etienne David Baranoff, Mohammad Khaja Nazeeruddin
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Publication number: 20130330632Abstract: The invention relates to electrochemical devices comprising complexes of cobalt comprising at least one ligand with a 5- or six membered, N-containing heteroring. The complex are useful as p- and n-dopants, as over of electrochemical devices, in particular in organic semiconductors. The complexes are further useful as over-discharge prevention and overvoltage protection agents.Type: ApplicationFiled: February 24, 2012Publication date: December 12, 2013Inventors: Julian Burschka, Florian Kessler, Etienne Baranoff, Mohammad Khaja Nazeeruddin, Michael Graetzel
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Publication number: 20130317212Abstract: The present invention relates to an organometallic complex, to the preparation of said material, to the use of said material and to a light emitting device which transform electric energy into light. The present invention is further related to provide phosphorescent complexes which contribute to extend the life time in operation of said OLEDs and especially when they are involved in the EL. The objectives of this invention are accomplished by iridium complex comprising 7-membered fused ring ligands which are tris-homoleptic or bis-homoleptic with an ancillary ligand.Type: ApplicationFiled: August 3, 2011Publication date: November 28, 2013Applicant: SOLVAY SAInventors: Mohammad Khaja Nazeeruddin, Etienne David Baranoff, Michael Graetzel
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Patent number: 8518557Abstract: This invention pertains to light emitting materials comprising novel ortho-metalated transition metal complexes [C^N]2ML comprising two orthometalated ligands having imidazole moieties and an ancillary ligand of ?-diketonate type. The ortho-metalated transition metal complexes are represented by formula (I): It has been surprisingly found that when the metal has bound thereto both orthometalated ligands comprising imidazole moieties and an ancillary ligand of ?-diketonate type, the ligands advantageously participate in the emission process, significantly broadening emission in the visible region and enabling appreciable improvement of the white emission efficiency of complexes [C^N]2ML. Additional objects of the invention are the use of the light emitting materials and organic light emitting device comprising the light emitting material.Type: GrantFiled: October 11, 2007Date of Patent: August 27, 2013Assignee: Solvay (Societe Anonyme)Inventors: Mohammad Khaja Nazeeruddin, Cedric Klein, Michael Graetzel
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Patent number: 8357800Abstract: The present invention relates to light emitting materials comprising novel ortho-metalated transition metal complexes [C^N]2M[N^N] comprising two orthometalated ligands (C^N ligands) and a neutral bidentate bipyridine ligand (N^N). Surprisingly, it has been found that when the metal binds both orthometalated chelate C^N ligands and a neutral bidentate bipyridine ligand (N^N), these ligands participate in the emission process, thus greatly improving the red emission efficiency of complexes [C^N]2M[N^N]. The present invention further relates to the use of such light emitting materials and an organic light emitting device comprising such light emitting material.Type: GrantFiled: June 5, 2008Date of Patent: January 22, 2013Assignee: SOLVAY (Societe Anonyme)Inventors: Mohammad Khaja Nazeeruddin, Etienne David Baranoff, Michael Graetzel
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Patent number: 8357799Abstract: This invention pertains to light emitting materials comprising novel ortho-metalated transition metal complexes [C^N]2M[P^O] comprising two orthometalated chelate C^N ligands and an ancillary ligand of bidentate phosphinocarboxylate type. It has been surprisingly found that when the metal has bound thereto both orthometalated chelate C^N ligands and an ancillary ligand of bidentate phosphinocarboxylate type (P^O), these ligands advantageously participate in the emission process, enabling appreciable improvement of the blue emission efficiency of complexes [C^N]2M[P^O]. Still objects of the invention are the use of such light emitting materials and organic light emitting device comprising such light emitting material.Type: GrantFiled: June 5, 2008Date of Patent: January 22, 2013Assignee: SOLVAY (Societe Anonyme)Inventors: Mohammad Khaja Nazeeruddin, Nicholas Evans, Michael Graetzel
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Publication number: 20120253043Abstract: The present invention provides new bi- and polypyridine ligands of ruthenium dyes. The invention also provides solar cells, in particular dye-sensitized solar cells comprising the dyes.Type: ApplicationFiled: September 29, 2010Publication date: October 4, 2012Applicants: Ecole Polytechnique Federale De Lausanne (EPFL), Consiglio Nazionale Delle Ricerche, Universita Degli Studi Di Milano-BicoccaInventors: Mohammad Khaja Nazeeruddin, Michael Graetzel, Alessandro Abbotto, Chiara Marinzi, Norberto Manfredi, Filippo De Angelis
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Publication number: 20120012790Abstract: White light emitting material comprising a complex salt of the general formula [M1m+]x [M2n?]y wherein: x m=y n, [M13+] and [M2n?] are ionic light emitting moieties which have complementary emission spectra, one emitting in the blue region of the visible spectra and the other, in the red region of the visible spectra, and wherein at least one of M1 and M2 is a metallic complex.Type: ApplicationFiled: February 8, 2010Publication date: January 19, 2012Applicant: SOLVAY SAInventors: Mohammad Khaja Nazeeruddin, Etienne David Baranoff, Michael Graetzel
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Publication number: 20110282059Abstract: A light emitting material comprising a complex of formula (I): (L1)x-M-(L2)y wherein L1 is a mono-anionic bidentate carbon-coordinating ligand comprising the structural element (II) in a ring system, wherein R1 is a substituent selected from the group consisting of R1-1 to R1-8, the use thereof as emissive materials in organic light emitting devices, and organic light emitting devices comprising said emissive material.Type: ApplicationFiled: February 8, 2010Publication date: November 17, 2011Applicant: SOLVAY SAInventors: Etienne David Baranoff, IL Jung, Mohammad Khaja Nazeeruddin, Michael Graetzel
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Publication number: 20110265876Abstract: The present invention relates to novel pyridine compounds that can be used as anchoring ligands in metal-based sensitizing dyes of dye sensitized solar cells (DSCS). The dyes comprising the polypyridine compounds exhibit improved light harvesting ability and lead to increased conversion efficiencies, in particular in thin TiO2 film devices.Type: ApplicationFiled: November 11, 2009Publication date: November 3, 2011Applicants: UNIVERSITÄT ULM, ECOLE POLYTECHNIQUE FEDERALE DE LAUSANNE (EPFL)Inventors: Shaik Mohammad Zakeeruddin, Cédric Klein, Mohammad Khaja Nazeeruddin, Michael Graetzel, Amaresh Mishra, Markus Fischer, Peter Bäuerle
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Patent number: 8039124Abstract: Electro luminescent metal, e.g. Ir, complexes are disclosed. The metal complexes comprise at least one ligand L1 and at least one ligand L2, wherein ligand L1 is a 2-phenylpyridine ligand (I), comprising a phenyl ring (A) and a pyridine ring (B). The integers 2 to 9 denote positions in which substitutions can be made, and by the use of different substituents, e.g. 2,4-difluoro and 7-N(CH3)2, the emission wavelength of the complex may be tuned. The ligand L2 may e.g. be a compound of the following formula (II).Type: GrantFiled: June 26, 2006Date of Patent: October 18, 2011Assignee: Koninklijke Philips Electronics N.V.Inventors: Mohammad Khaja Nazeeruddin, Rene Theodorus Wegh, Steve Klink, Michael Graetzel, Cedric Nicolas Klein