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).

  • Patent number: 9269912
    Abstract: 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: Grant
    Filed: November 21, 2011
    Date of Patent: February 23, 2016
    Assignee: SOLVAY SA
    Inventors: Michael Graetzel, Etienne David Baranoff, Mohammad Khaja Nazeeruddin
  • Publication number: 20150303394
    Abstract: 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: Application
    Filed: November 18, 2013
    Publication date: October 22, 2015
    Inventors: 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
  • Publication number: 20150213966
    Abstract: 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: Application
    Filed: August 14, 2013
    Publication date: July 30, 2015
    Inventors: Thomas Wesley Holcombe, Jun Ho Yum, Mohammad Khaja Nazeeruddin, Michael Graetzel
  • Publication number: 20150200377
    Abstract: 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: Application
    Filed: July 24, 2013
    Publication date: July 16, 2015
    Applicant: Ecole Polytechnique Federale de Lausanne (EPFL)
    Inventors: Lioz Etgar, Mohammad Khaja Nazeeruddin, Michael Graetzel
  • Patent number: 8980440
    Abstract: 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: Grant
    Filed: April 3, 2007
    Date of Patent: March 17, 2015
    Assignee: Solvay (Societe Anonyme)
    Inventors: Mohammad Khaja Nazeeruddin, Cedric Klein, Michael Graetzel
  • Publication number: 20140332079
    Abstract: 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: Application
    Filed: December 8, 2011
    Publication date: November 13, 2014
    Inventors: Aravind Kumar Chandiran, Mohammad Khaja Nazeeruddin, Michael Graetzel
  • Publication number: 20140239288
    Abstract: 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: Application
    Filed: October 18, 2011
    Publication date: August 28, 2014
    Applicant: Ecole Polytechnique Féderale de Lausanne (EPFL)
    Inventors: Jared Delcamp, Michael Graetzel, Mohammad Khaja Nazeeruddin
  • Publication number: 20140060641
    Abstract: 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: Application
    Filed: February 24, 2012
    Publication date: March 6, 2014
    Applicant: Ecole Polytechnique Federale de Lausanne
    Inventors: Mohammad Khaja Nazeeruddin, Michael Graetzel, Etienne Baranoff, Florian Kessler, Jun-Ho Yum, Aswani Yella, Hoi Nok Tsao, Shaik Mohammad Zakeeruddin
  • Patent number: 8663821
    Abstract: 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: Grant
    Filed: July 15, 2009
    Date of Patent: March 4, 2014
    Assignee: Solvay SA
    Inventors: Etienne David Baranoff, Mohammad Khaja Nazeeruddin, Michael Graetzel
  • Publication number: 20140005397
    Abstract: 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: Application
    Filed: November 21, 2011
    Publication date: January 2, 2014
    Applicant: SOLVAY SA
    Inventors: Michael Graetzel, Etienne David Baranoff, Mohammad Khaja Nazeeruddin
  • Publication number: 20130330632
    Abstract: 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: Application
    Filed: February 24, 2012
    Publication date: December 12, 2013
    Inventors: Julian Burschka, Florian Kessler, Etienne Baranoff, Mohammad Khaja Nazeeruddin, Michael Graetzel
  • Publication number: 20130317212
    Abstract: 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: Application
    Filed: August 3, 2011
    Publication date: November 28, 2013
    Applicant: SOLVAY SA
    Inventors: Mohammad Khaja Nazeeruddin, Etienne David Baranoff, Michael Graetzel
  • Patent number: 8518557
    Abstract: 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: Grant
    Filed: October 11, 2007
    Date of Patent: August 27, 2013
    Assignee: Solvay (Societe Anonyme)
    Inventors: Mohammad Khaja Nazeeruddin, Cedric Klein, Michael Graetzel
  • Patent number: 8357800
    Abstract: 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: Grant
    Filed: June 5, 2008
    Date of Patent: January 22, 2013
    Assignee: SOLVAY (Societe Anonyme)
    Inventors: Mohammad Khaja Nazeeruddin, Etienne David Baranoff, Michael Graetzel
  • Patent number: 8357799
    Abstract: 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: Grant
    Filed: June 5, 2008
    Date of Patent: January 22, 2013
    Assignee: SOLVAY (Societe Anonyme)
    Inventors: Mohammad Khaja Nazeeruddin, Nicholas Evans, Michael Graetzel
  • Publication number: 20120253043
    Abstract: 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: Application
    Filed: September 29, 2010
    Publication date: October 4, 2012
    Applicants: Ecole Polytechnique Federale De Lausanne (EPFL), Consiglio Nazionale Delle Ricerche, Universita Degli Studi Di Milano-Bicocca
    Inventors: Mohammad Khaja Nazeeruddin, Michael Graetzel, Alessandro Abbotto, Chiara Marinzi, Norberto Manfredi, Filippo De Angelis
  • Publication number: 20120012790
    Abstract: 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: Application
    Filed: February 8, 2010
    Publication date: January 19, 2012
    Applicant: SOLVAY SA
    Inventors: Mohammad Khaja Nazeeruddin, Etienne David Baranoff, Michael Graetzel
  • Publication number: 20110282059
    Abstract: 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: Application
    Filed: February 8, 2010
    Publication date: November 17, 2011
    Applicant: SOLVAY SA
    Inventors: Etienne David Baranoff, IL Jung, Mohammad Khaja Nazeeruddin, Michael Graetzel
  • Publication number: 20110265876
    Abstract: 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: Application
    Filed: November 11, 2009
    Publication date: November 3, 2011
    Applicants: 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
  • Patent number: 8039124
    Abstract: 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: Grant
    Filed: June 26, 2006
    Date of Patent: October 18, 2011
    Assignee: Koninklijke Philips Electronics N.V.
    Inventors: Mohammad Khaja Nazeeruddin, Rene Theodorus Wegh, Steve Klink, Michael Graetzel, Cedric Nicolas Klein