Sulfur Containing Patents (Class 252/301.6S)
  • Publication number: 20150108405
    Abstract: The present invention provides new compositions containing nearly monodisperse colloidal core/shell semiconductor nanocrystals with high photoluminescence quantum yields (PL QY), as well as other complex structured semiconductor nanocrystals. This invention also provides new synthetic methods for preparing these nanocrystals, and new devices comprising these compositions. In addition to core/shell semiconductor nanocrystals, this patent application also provides complex semiconductor nanostructures, quantum shells, quantum wells, doped nanocrystals, and other multiple-shelled semiconductor nanocrystals.
    Type: Application
    Filed: October 28, 2014
    Publication date: April 23, 2015
    Inventors: Xiaogang PENG, Jianqing LI, David BATTAGLIA, Y. Andrew WANG, Yunjun WANG
  • Patent number: 9005480
    Abstract: The present invention describes a solventless ligand exchange using a siloxane polymer having a binding ligand that displaces the binding ligand on a quantum dot material.
    Type: Grant
    Filed: March 13, 2014
    Date of Patent: April 14, 2015
    Assignee: Nanosys, Inc.
    Inventors: Paul T. Furuta, Robert Dubrow
  • Publication number: 20150083969
    Abstract: A nanocrystal particle including at least one semiconductor material and at least one halogen element, the nanocrystal particle including: a core comprising a first semiconductor nanocrystal; and a shell surrounding the core and comprising a crystalline or amorphous material, wherein the halogen element is present as being doped therein or as a metal halide
    Type: Application
    Filed: September 24, 2014
    Publication date: March 26, 2015
    Inventors: Hyunki KIM, Shin Ae JUN, Eun Joo JANG, Yongwook KIM, Tae Gon KIM, Yuho WON, Taekhoon KIM, Hyo Sook JANG
  • Patent number: 8980133
    Abstract: A semiconductor nanocrystal capable of emitting light with an improved photoluminescence quantum efficiency. The present invention further relates to compositions and devices including semiconductor nanocrystals capable of emitting light with an improved photoluminescence quantum efficiency. A semiconductor nanocrystal wherein the semiconductor nanocrystal is capable of emitting light with a photoluminescence quantum efficiency greater than about 50% upon excitation and including a maximum peak emission with a FWHM less than 20 nm is disclosed. Also disclosed are a device, a population of semiconductor nanocrystals, and a composition including a semiconductor nanocrystal wherein the semiconductor nanocrystal is capable of emitting light with a photoluminescence quantum efficiency greater than about 50% upon excitation and including a maximum peak emission with a FWHM less than 20 nm.
    Type: Grant
    Filed: May 21, 2009
    Date of Patent: March 17, 2015
    Assignee: QD Vision, Inc.
    Inventor: Dorai Ramprasad
  • Publication number: 20150041714
    Abstract: A method of storing and transporting quantum dot formulations is provided. The method includes storing and/or transporting the quantum dot formulation under an oxygen-containing atmosphere. A sparged and degassed quantum dot formulation is also described.
    Type: Application
    Filed: August 14, 2014
    Publication date: February 12, 2015
    Inventors: KARTHIK VENKATARAMAN, ABHISHEK GUPTA
  • Publication number: 20150014586
    Abstract: Quantum dots and methods of making quantum dots are provided.
    Type: Application
    Filed: May 21, 2014
    Publication date: January 15, 2015
    Applicant: QD VISION, INC.
    Inventors: WENHAO LIU, CRAIG BREEN
  • Publication number: 20150014587
    Abstract: The present application provides nitride semiconductor nanoparticles, for example nanocrystals, made from a new composition of matter in the form of a novel compound semiconductor family of the type group II-III-N, for example ZnGaN, ZnInN, ZnInGaN, ZnAlN, ZnAlGaN, ZnAlInN and ZnAlGaInN. This type of compound semiconductor nanocrystal is not previously known in the prior art. The invention also discloses II-N semiconductor nanocrystals, for example ZnN nanocrystals, which are a subgroup of the group II-III-N semiconductor nanocrystals. The composition and size of the new and novel II-III-N compound semiconductor nanocrystals can be controlled in order to tailor their band-gap and light emission properties. Efficient light emission in the ultraviolet-visible-infrared wavelength range is demonstrated.
    Type: Application
    Filed: September 16, 2014
    Publication date: January 15, 2015
    Inventors: Peter Neil TAYLOR, Jonathan HEFFERNAN, Stewart Edward HOOPER, Tim Michael SMEETON
  • Patent number: 8932489
    Abstract: A method of synthesizing colloidal semiconductor nanocrystals involves contacting a source of at least one semi-conductor cation element (Group 11-14, more preferably Group 12-14, more preferably 12 or 14, more preferably Cd, Zn, Hg or Pb, most preferably Cd) with a source of at least one Group 15, or 16 element in the presence of a ligand forming compound containing a carboxylic acid moiety in a reaction medium comprising a solvent that is substantially noncoordinating with respect to the at least one cation, the ligand forming compound and the source of at least one cation element having a molar ratio of 1:1 or less. The cation element source is preferably bonded to two low carbon acids. Some of the low carbon acids are substituted with the ligand forming compound to produce a cation precursor that is more soluble in the noncoordinating solvent.
    Type: Grant
    Filed: August 11, 2009
    Date of Patent: January 13, 2015
    Assignee: National Research Council of Canada.
    Inventors: Kui Yu, Jianying Ouyang
  • Patent number: 8906265
    Abstract: A semiconductor nanocrystal capable of emitting blue light upon excitation. Also disclosed are devices, populations of semiconductor nanocrystals, and compositions including a semiconductor nanocrystal capable of emitting blue light upon excitation. In one embodiment, a semiconductor nanocrystal capable of emitting blue light including a maximum peak emission at a wavelength not greater than about 470 nm with a photoluminescence quantum efficiency greater than about 65% upon excitation. In another embodiment, a semiconductor nanocrystal includes a core comprising a first semiconductor material comprising at least three chemical elements and a shell disposed over at least a portion of the core, the shell comprising a second semiconductor material, wherein the semiconductor nanocrystal is capable of emitting blue light with a photoluminescence quantum efficiency greater than about 65% upon excitation.
    Type: Grant
    Filed: March 25, 2013
    Date of Patent: December 9, 2014
    Assignee: QD Vision, Inc.
    Inventors: Craig Breen, Jonathan S. Steckel, Dorai Ramprasad
  • Publication number: 20140326921
    Abstract: The invention relates to a continuous-flow synthesis process for the preparation of high quality indium phosphide/zinc sulfide core/shell semiconduting nanocrystals in particular quantum dots (QD) conducted in a micro-reaction system comprising at least one mixing chamber connected to one reaction chamber.
    Type: Application
    Filed: November 26, 2012
    Publication date: November 6, 2014
    Inventors: Huachang Lu, Werner Hoheisel, Leslaw Mleczko, Stephan Nowak
  • Publication number: 20140264172
    Abstract: A scalable method for the manufacture of narrow, bright, monodisperse, photo-luminescent quantum dots prepared in the presence of a Group II-VI molecular seeding cluster fabricated in situ from a zinc salt and a thiol or selenol compound. Exemplary quantum dots have a core containing indium, phosphorus, zinc and either sulfur or selenium.
    Type: Application
    Filed: March 13, 2014
    Publication date: September 18, 2014
    Applicant: Nanoco Technologies, Ltd.
    Inventors: Steven Daniels, James Harris, Paul Glarvey, Katherine Orchard, Arun Narayanaswamy
  • Publication number: 20140117286
    Abstract: A composition for preparing a semiconductor nanocrystal, the composition including (i) a Group II and/or Group III precursor, (ii) a Group VI and/or Group V precursor, (iii) an acid anhydride or acyl halide, and (iv) a solvent.
    Type: Application
    Filed: October 29, 2013
    Publication date: May 1, 2014
    Applicant: SAMSUNG ELECTRONICS CO., LTD.
    Inventors: Shin Ae JUN, Eun Joo JANG, Hyo Sook JANG, Seoung-Jae IM
  • Patent number: 8691114
    Abstract: A composition comprising a semiconductor nanocrystal including a core comprising a first semiconductor material comprising at least three chemical elements and a shell disposed over at least a portion of the core, the shell comprising a second semiconductor material, wherein the semiconductor nanocrystal is capable of emitting light upon excitation with a photoluminescence quantum efficiency greater than about 65%. Also disclosed is a composition comprising a semiconductor nanocrystal including a core comprising a first semiconductor material comprising at least three chemical elements and a shell disposed over at least a portion of the core, the shell comprising a second semiconductor material comprising at least three chemical elements, wherein the semiconductor nanocrystal is capable of emitting light with a photoluminescence quantum efficiency greater than about 60% upon excitation.
    Type: Grant
    Filed: February 15, 2013
    Date of Patent: April 8, 2014
    Assignee: QD Vision, Inc.
    Inventors: Dorai Ramprasad, Craig Breen, Jonathan S. Steckel
  • Publication number: 20140084212
    Abstract: The method for synthesizing indium phosphide nanoparticles using indium trichloride as an indium raw material and tris(dimethylamino)phosphine as a phosphorus raw material, includes a preparation step of mixing the indium raw material, the phosphorus raw material, an organic solvent having a boiling point of 170° C. or higher, and a particle surface ligand to obtain a mixture solution and a synthesis step of synthesizing the indium phosphide nanoparticles by heating the mixture solution to 150° C. or higher but lower than 170° C. In the method, the particle surface ligand is an aliphatic amine having a carbon number of 18 or more, and the indium trichloride is an anhydride.
    Type: Application
    Filed: November 27, 2013
    Publication date: March 27, 2014
    Applicant: FUJIFILM CORPORATION
    Inventor: Makoto KIKUCHI
  • Publication number: 20140027673
    Abstract: A quantum dot formulation substantially free of oxygen and, optionally, substantially free of water and a method of making a quantum dot formulation substantially free of oxygen and, optionally, substantially free of water is described. Also described are products including the quantum dot formulation described herein and related methods.
    Type: Application
    Filed: February 7, 2013
    Publication date: January 30, 2014
    Applicant: QD VISION, INC.
    Inventors: Robert J. NICK, Craig Alan BREEN, Chad M. DENTON, Sridhar SADASIVAN, John R. LINTON
  • Patent number: 8603362
    Abstract: A method is provided for preparing luminescent semiconductor nanoparticles composed of a first component X, a second component A, and a third component B, wherein X, A, and B are different, by combining B with X and A in an amount such that the molar ratio B:(A+B) is in the range of approximately 0.001 to 0.20 and the molar ratio X:(A+B) is in the range of approximately 0.5:1.0 to 2:1. The characteristics of these nanoparticles can be substantially similar to those of nanoparticles containing only X and B while maintaining many useful properties characteristic of nanoparticles containing only X and A; and can additionally exhibit emergent properties such as a peak emission energy less than that characteristic of a particle composed of XA or XB alone. This method is particularly applicable to the preparation of stable, bright nanoparticles that emit in the red to infrared regions of the electromagnetic spectrum.
    Type: Grant
    Filed: September 10, 2012
    Date of Patent: December 10, 2013
    Assignee: Life Technologies Corporation
    Inventors: Marc Schrier, Donald Zehnder, Joseph Treadway, Joseph Bartel
  • Patent number: 8557143
    Abstract: An electroluminescent phosphor comprising ZnS:Mn is disclosed. Also disclosed are ZnS:Mn electroluminescent phosphors that are free of or substantially free of copper, and/or wherein the phosphor has a D50 size of less than about 5 ?m. In addition, a method for preparing a ZnS:Mn phosphor is disclosed, comprising the steps of contacting at least a portion of each of a first solution comprising a Zn2+ compound, a manganese source, and a second solution comprising a S2? source agent; and then heating the mixture at a temperature and for a time sufficient to form a phosphor.
    Type: Grant
    Filed: March 11, 2009
    Date of Patent: October 15, 2013
    Assignee: Global Tungsten and Powders Corp.
    Inventors: Xianzhong Chen, Shellie Kaye Northrop, Chen-Wen Fan
  • Patent number: 8551363
    Abstract: A method of producing a Group II-VI compound semiconductor. The method involves generating a pulsed electrical discharge plasma between metallic electrodes in sulfur to produce a Group II-VI compound semiconductor. A method of producing a Group II-VI compound semiconductor phosphor using a pulsed electrical discharge plasma. A hexagonal crystal of Group II-VI compound semiconductor composed of a plurality of twin crystals.
    Type: Grant
    Filed: February 5, 2009
    Date of Patent: October 8, 2013
    Assignees: National University Corporation Kumamoto University, Kuraray Co., Ltd.
    Inventors: Tsutomu Mashimo, Omurzak Uulu Emil, Makoto Okamoto, Hideharu Iwasaki
  • Publication number: 20130240788
    Abstract: A nanocrystal capable of light emission includes a nanoparticle having photoluminescence having quantum yields of greater than 30%.
    Type: Application
    Filed: May 9, 2013
    Publication date: September 19, 2013
    Applicant: Massachusetts Institute of Technology
    Inventors: Moungi G. Bawendi, Klavs F. Jensen, Bashir O. Dabbousi, Javier Rodriguez-Viejo, Frederic Victor Mikulec
  • Patent number: 8501042
    Abstract: A phosphor represented by Formula 1: ZnS:Cu,Cl,Mn,Te.
    Type: Grant
    Filed: June 15, 2010
    Date of Patent: August 6, 2013
    Assignees: Samsung Electronics Co., Ltd., Korea Advanced Institute of Science and Technology
    Inventors: Shang-hyeun Park, Bong-je Park, Duk-young Jeon, Tae-won Jeong, Ji-yon Han
  • Patent number: 8491818
    Abstract: An economic, direct synthetic method for producing water soluble ZnS QDs that are ready for bioconjugation is provided. The method can produce aqueous ZnS QDs with emission wavelengths varying from 400 nm to 700 nm. Highly luminescent metal sulfide (MS) QDs are produced via an aqueous synthesis route. MS QDs are capped with thiol-containing charged molecules in a single step. The resultant MS QDs exhibit the distinctive excitonic photoluminescence desired of QDs and can be fabricated to avoid undesirable broadband emissions at higher wavelengths. The aqueous ZnS QDs are stable in biological fluids over a long period of time. In addition, non-toxic ZnS QDs have been produced with good photoluminescence properties.
    Type: Grant
    Filed: November 21, 2007
    Date of Patent: July 23, 2013
    Assignee: Drexel University
    Inventors: Wei-Heng Shih, Wan Y. Shih, Hui Li
  • Publication number: 20130175475
    Abstract: A luminescent material can be formed by a process using a vacancy-filling agent that includes vacancy-filling atoms. In an embodiment, the process can include forming a mixture of a constituent corresponding to the luminescent material and the vacancy-filling agent. The process can further include forming the luminescent material from the mixture, wherein the luminescent material includes at least some of the vacancy-filling atoms from the vacancy-filling agent. In another embodiment, the process can include melting a constituent corresponding to the luminescent material to form a melt and adding a vacancy-filling agent into the melt. The process can also include forming the luminescent material from the melt, wherein the luminescent material includes at least some of the vacancy-filling atoms from the vacancy-filling agent. The luminescent material may have one or more improved performance properties as compared to a corresponding base material of the luminescent material.
    Type: Application
    Filed: November 23, 2012
    Publication date: July 11, 2013
    Inventor: Vladimir Ouspenski
  • Publication number: 20130105737
    Abstract: Zinc sulfide phosphor that has high energy efficiency and color purity and that emits blue light is provided. Specifically, a zinc sulfide phosphor adapted for use as a light source or in a display by being applied to powder EL elements is provided. The zinc sulfide blue phosphor comprises copper, silver or both elements and nickel, iron or both elements. The phosphor is obtained by adding a compound comprising copper, silver or both elements, a zinc compound, a sulfidizing agent and a compound comprising nickel, iron or both elements as an aqueous solution to an organic solvent to form a reaction mixture, heating the mixture and removing water from the reaction mixture by azeotropic dehydration of water and the organic solvent to obtain a zinc sulfide phosphor precursor, further sintering the zinc sulfide phosphor precursor.
    Type: Application
    Filed: May 11, 2011
    Publication date: May 2, 2013
    Applicant: SAKAI CHEMICAL INDUSTRY CO., LTD.
    Inventors: Keiji Ono, Akihumi Sano, Hiroki Nagayoshi, Keita Kobayashi, Satoshi Komori, Atsuki Terabe, Yosuke Akahori, Kazuma Inoue, Hideharu Iwasaki
  • Patent number: 8425803
    Abstract: Matrixes doped with semiconductor nanocrystals are provided. In certain embodiments, the semiconductor nanocrystals have a size and composition such that they absorb or emit light at particular wavelengths. The nanocrystals can comprise ligands that allow for mixing with various matrix materials, including polymers, such that a minimal portion of light is scattered by the matrixes. The matrixes of the present invention can also be utilized in refractive index matching applications. In other embodiments, semiconductor nanocrystals are embedded within matrixes to form a nanocrystal density gradient, thereby creating an effective refractive index gradient. The matrixes of the present invention can also be used as filters and antireflective coatings on optical devices and as down-converting layers. Processes for producing matrixes comprising semiconductor nanocrystals are also provided.
    Type: Grant
    Filed: November 9, 2009
    Date of Patent: April 23, 2013
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: J. Wallace Parce, Paul Bernatis, Robert Dubrow, William P. Freeman, Joel Gamoras, Shihai Kan, Andreas Meisel, Baixin Qian, Jeffery A. Whiteford, Jonathan Ziebarth
  • Patent number: 8409473
    Abstract: A semiconductor nanocrystal composition that is stable and has high luminescent quantum yield. The semiconductor nanocrystal composition has a semiconductor nanocrystal core of a group II alloyed I-III-VI semiconductor nanocrystal material. A method of making a semiconductor nanocrystal composition is also provides which includes synthesizing a semiconductor nanocrystal core of a group II alloyed I-III-VI semiconductor material.
    Type: Grant
    Filed: February 27, 2007
    Date of Patent: April 2, 2013
    Assignee: Evident Technologies, Inc.
    Inventor: Weili Shi
  • Patent number: 8404154
    Abstract: A semiconductor nanocrystal capable of emitting blue light upon excitation. Also disclosed are devices, populations of semiconductor nanocrystals, and compositions including a semiconductor nanocrystal capable of emitting blue light upon excitation. In one embodiment, a semiconductor nanocrystal capable of emitting blue light including a maximum peak emission at a wavelength not greater than about 470 nm with a photoluminescence quantum efficiency greater than about 65% upon excitation. In another embodiment, a semiconductor nanocrystal includes a core comprising a first semiconductor material comprising at least three chemical elements and a shell disposed over at least a portion of the core, the shell comprising a second semiconductor material, wherein the semiconductor nanocrystal is capable of emitting blue light with a photoluminescence quantum efficiency greater than about 65% upon excitation.
    Type: Grant
    Filed: May 21, 2009
    Date of Patent: March 26, 2013
    Assignee: QD Vision, Inc.
    Inventors: Craig Breen, Jonathan S. Steckel, Dorai Ramprasad
  • Patent number: 8337721
    Abstract: In one aspect, the invention relates to an inorganic nanoparticle or nanocrystal, also referred to as a quantum dot, capable of emitting white light. In a further aspect, the invention relates to an inorganic nanoparticle capable of absorbing energy from a first electromagnetic region and capable of emitting light in a second electromagnetic region, wherein the second electromagnetic region comprises an at least about 50 nm wide band of wavelengths and to methods for the preparation thereof. In further aspects, the invention relates to a frequency converter, a light emitting diode device, a modified fluorescent light source, an electroluminescent device, and an energy cascade system comprising the nanoparticle of the invention. This abstract is intended as a scanning tool for purposes of searching in the particular art and is not intended to be limiting of the present invention.
    Type: Grant
    Filed: October 17, 2006
    Date of Patent: December 25, 2012
    Assignee: Vanderbilt University
    Inventors: Michael J. Bowers, James R. McBride, Sandra J. Rosenthal
  • Patent number: 8337722
    Abstract: The present invention provides a method for producing a zinc sulfide based phosphor by firing a zinc sulfide based precursor, comprising at least: a first firing step and a second firing step. Use of the method of the present invention makes it possible to provide a zinc sulfide based phosphor material suitable in the production of an EL device that shows high brightness.
    Type: Grant
    Filed: July 30, 2009
    Date of Patent: December 25, 2012
    Assignee: Kuraray Co., Ltd.
    Inventors: Yoshihisa Tsuji, Kazuma Inoue, Jun Takai, Hideharu Iwasaki
  • Publication number: 20120313044
    Abstract: A coating solution for forming a light-absorbing layer of a CZTS solar cell, including a hydrazine-coordinated Cu chalcogenide complex component (A), a hydrazine-coordinated Sn chalcogenide complex component (B) and a hydrazine-coordinated Zn chalcogenide complex component (C) dissolved in dimethylsulfoxide; and a method of producing a coating solution forming a light-absorbing layer a CZTS solar cell, including preparing dimethylsulfoxide having a hydrazine-coordinated Cu chalcogenide complex dissolved therein as a first solution, dissolving a hydrazine-coordinated Sn chalcogenide complex in dimethylsulfoxide to obtain a second solution, dissolving a hydrazine-coordinated Zn chalcogenide complex in dimethylsulfoxide to obtain a third solution, and mixing together the first solution, the second solution and the third solution.
    Type: Application
    Filed: June 10, 2011
    Publication date: December 13, 2012
    Applicant: TOKYO OHKA KOGYO CO., LTD.
    Inventors: Masaru KUWAHARA, Koichi MISUMI, Hidenori MIYAMOTO
  • Patent number: 8287761
    Abstract: A method is provided for preparing luminescent semiconductor nanoparticles composed of a first component X, a second component A, and a third component B, wherein X, A, and B are different, by combining B with X and A in an amount such that the molar ratio B:(A+B) is in the range of approximately 0.001 to 0.20 and the molar ratio X:(A+B) is in the range of approximately 0.5:1.0 to 2:1. The characteristics of the thus-prepared nanoparticles can be substantially similar to those of nanoparticles containing only X and B while maintaining many useful properties characteristic of nanoparticles containing only X and A. The nanoparticles so prepared can additionally exhibit emergent properties such as a peak emission energy less than that characteristic of a particle composed of XA or XB alone; this method is particularly applicable to the preparation of stable, bright nanoparticles that emit in the red to infrared regions of the electromagnetic spectrum.
    Type: Grant
    Filed: June 15, 2009
    Date of Patent: October 16, 2012
    Assignee: Life Technologies Corporation
    Inventors: Marc Schrier, Donald Zehnder, Joseph Treadway, Joseph Bartel
  • Publication number: 20120153228
    Abstract: A yellow phosphor having oxyapatite structure, preparation method and white light-emitting diode thereof are disclosed. The yellow phosphor has a chemical formula of (A1?xEux)8?yB2+y(PO4)6?y(SiO4)y(O1?zSz)2, wherein A and Eu are divalent metal ions, B is a trivalent metal ion, 0<x?0.6, 0?y?6, and 0?z?1. A can be an alkaline earth metal, Mn or Zn. B can be a group 13 metal, a rare earth meal or Bi.
    Type: Application
    Filed: November 10, 2011
    Publication date: June 21, 2012
    Applicant: NATIONAL CHIAO TUNG UNIVERSITY
    Inventors: Teng-Ming CHEN, Chien-Hao HUANG
  • Patent number: 8192646
    Abstract: The ionic conjugates include an inorganic particle electrostatically associated with a macromolecule which can interact specifically with predetermined chemical species or biological targets.
    Type: Grant
    Filed: September 9, 2011
    Date of Patent: June 5, 2012
    Assignees: Massachusetts Institute of Technology, The United States of America as represented by the Secretary of the Navy
    Inventors: George P. Anderson, Hedi Mattoussi, J. Matthew Mauro, Moungi G. Bawendi, Vikram C. Sundar
  • Publication number: 20120049119
    Abstract: A semiconductor nanocrystal can have a photoluminescent quantum yield of at least 90%, at least 95%, or at least 98%. The nanocrystal can be made by sequentially contacting a nanocrystal core with an M-containing compound and an X donor, where at least one of the M-containing compound and the X donor is substoichiometric with respect to forming a monolayer on the nanocrystal core.
    Type: Application
    Filed: August 24, 2010
    Publication date: March 1, 2012
    Applicant: Massachusetts Institute of Technology
    Inventors: Andrew B. Greytak, Wenhao Liu, Peter M. Allen, Moungi G. Bawendi, Daniel G. Nocera
  • Patent number: 8034259
    Abstract: The ionic conjugates include an inorganic particle electrostatically associated with a macromolecule which can interact specifically with predetermined chemical species or biological targets.
    Type: Grant
    Filed: December 19, 2008
    Date of Patent: October 11, 2011
    Assignee: Massachusetts Institute of Technology
    Inventors: George P. Anderson, Hedi Mattoussi, J. Matthew Mauro, Moungi G. Bawendi, Vikram C. Sundar
  • Publication number: 20110226991
    Abstract: A population of nanoparticles is disclosed. The population is comprised of a plurality of core/shell nanocrystals, each including: a semiconductor core, an intermediate semiconductor shell layer disposed over the semiconductor core, an external semiconductor shell layer disposed over the intermediate semiconductor shell layer, and a hydrophilic organic layer in direct contact with the external semi-conductor shell layer. The population of nanoparticles has a ?on value of less than about 1.4.
    Type: Application
    Filed: October 23, 2009
    Publication date: September 22, 2011
    Applicant: Life Technologies Corporation
    Inventors: Joseph A. Treadway, Eric Tulsky
  • Publication number: 20110186780
    Abstract: The present invention deals with transition metal ions doped semiconductor nanocrystals that are free from heavy metals like cadmium and therefore environment friendly and useful for biological applications. The present invention also describes a process for the preparation of such transition metal ion doped semiconductor nanocrystals, where the reactions take place at a temperature less than 3000 C. The said doped nanocrystals are stable in air and under UV radiation in both solution and precipitated solid form.
    Type: Application
    Filed: August 17, 2009
    Publication date: August 4, 2011
    Applicant: INDIAN ASSOCIATION FOR THE CULTIVATION OF SCIENCE
    Inventors: Narayan Pradhan, Nikhil Ranjan Jana, Dipankar Das Sarma
  • Publication number: 20110186779
    Abstract: A method for reclaiming a semiconductor material from a glass substrate is disclosed, the method comprises the steps of providing at least one glass substrate having the semiconductor material disposed thereon, reducing the glass substrate having a semiconductor material disposed thereon to a plurality of glass particles having the semiconductor material disposed thereon by introducing a source of energy thereto, separating the semiconductor material from the plurality of glass particles to obtain semiconductor particles, and pyrometall?rgicaHy refining the semiconductor particles and the fine glass particles.
    Type: Application
    Filed: August 13, 2009
    Publication date: August 4, 2011
    Inventors: John Bohland, Andreas Wade
  • Publication number: 20110175030
    Abstract: A method of making a colloidal solution of ternary AIAIIB nanocrystals, wherein AI and AII are independently selected from an element of periodic table subgroup IIB, when B represents an element of periodic table main group VI; or AI and AII are independently selected from an element from periodic table main group III, when B represents an element of periodic table main group V. The method providing a mixture of AI in a suitable form for the generation of a nanocrystal, and coordinating solvents including at least 30 wt % of fatty acids; heating the reaction mixture for a suitable time, adding B in a suitable form for the generation of a nanocrystal, adding AII in a suitable form for the generation of a nanocrystals; and heating the reaction mixture for a sufficient period of time at a temperature suitable for forming nanocrystal AIAIIB.
    Type: Application
    Filed: January 15, 2010
    Publication date: July 21, 2011
    Inventors: XIAOFAN REN, Keith B. Kahen
  • Patent number: 7976726
    Abstract: A formulation comprises quantum dots and a quenching-preventive agent in a carrier material. The quenching-preventive agent is a metal chelating agents, a corrosion inhibitor, or a combination thereof. The formulation can be applied to a metal substrate, without experiencing metal ion induced fluorescence quenching.
    Type: Grant
    Filed: April 25, 2007
    Date of Patent: July 12, 2011
    Assignee: Siluria Technologies, Inc.
    Inventors: Cheng-I Wang, Haixia Dai, Manfred Heidecker
  • Publication number: 20110147663
    Abstract: The present invention provides a method for producing a zinc sulfide based phosphor by firing a zinc sulfide based phosphor precursor, comprising at least: a first firing step of firing a mixture containing a zinc sulfide based phosphor precursor, sulfur, and a chlorine-containing flux; and a second firing step of further firing the fired product obtained from the first firing step, wherein the first firing step comprises: heating the mixture in an atmosphere wherein an air stream is introduced so that a temperature of the mixture is increased from normal temperature to a transformation temperature at which a crystal system of the phosphor precursor is transformed; when a temperature of the mixture is increased above the transformation temperature, switching the atmosphere to a nitrogen atmosphere and continuing the heating of the mixture; and when the temperature of the mixture reaches a temperature in a range of 1000° C. to 1200° C.
    Type: Application
    Filed: July 30, 2009
    Publication date: June 23, 2011
    Applicant: KURARAY CO. LTD.
    Inventors: Yoshihisa Tsuji, Kazuma Inoue, Jun Takai, Hideharu Iwasaki
  • Patent number: 7919012
    Abstract: The present invention provides new compositions containing nearly monodisperse colloidal core/shell semiconductor nanocrystals with high photoluminescence quantum yields (PL QY), as well as other complex structured semiconductor nanocrystals. This invention also provides new synthetic methods for preparing these nanocrystals, and new devices comprising these compositions. In addition to core/shell semiconductor nanocrystals, this patent application also provides complex semiconductor nanostructures, quantum shells, quantum wells, doped nanocrystals, and other multiple-shelled semiconductor nanocrystals.
    Type: Grant
    Filed: March 10, 2010
    Date of Patent: April 5, 2011
    Assignee: The Board of Trustees of the University of Arkansas
    Inventors: Xiaogang Peng, Jianqing Li, David Battaglia, Y. Andrew Wang, Yunjun Wang
  • Publication number: 20110073808
    Abstract: A phosphor represented by Formula 1: ZnS:Cu,Cl,Mn,Te.
    Type: Application
    Filed: June 15, 2010
    Publication date: March 31, 2011
    Applicants: SAMSUNG ELECTRONICS CO., LTD., KOREA ADVANCED INSTITUTE OF SCIENCE AND TECHNOLOGY
    Inventors: Shang-hyeun Park, Bong-je Park, Duk-young Jeon, Tae-won Jeong, Ji-yon Han
  • Publication number: 20110017950
    Abstract: A nanocrystal capable of light emission includes a nanoparticle having photoluminescence having quantum yields of greater than 30%.
    Type: Application
    Filed: March 16, 2010
    Publication date: January 27, 2011
    Inventors: Moungi G. Bawendi, Frederic V. Mikulec
  • Publication number: 20100308272
    Abstract: The present invention provides new compositions containing nearly monodisperse colloidal core/shell semiconductor nanocrystals with high photoluminescence quantum yields (PL QY), as well as other complex structured semiconductor nanocrystals. This invention also provides new synthetic methods for preparing these nanocrystals, and new devices comprising these compositions. In addition to core/shell semiconductor nanocrystals, this patent application also provides complex semiconductor nanostructures, quantum shells, quantum wells, doped nanocrystals, and other multiple-shelled semiconductor nanocrystals.
    Type: Application
    Filed: March 10, 2010
    Publication date: December 9, 2010
    Inventors: Xiaogang Peng, Jianqing Li, David Battaglia, Y. Andrew Wang, Yunjun Wang
  • Patent number: 7833437
    Abstract: The present invention is an electroluminescent phosphor wherein each individual phosphor particle is encapsulated in an inorganic coating applied by an atomic layer deposition (ALD) coating method. In a preferred embodiment, the coating is aluminum oxyhydroxide. The encapsulated phosphor shows an extreme insensitivity to atmospheric moisture and suffers only minor loss of initial brightness in lamps.
    Type: Grant
    Filed: January 12, 2007
    Date of Patent: November 16, 2010
    Assignee: Global Tungsten & Powders Corp.
    Inventors: Chen-Wen Fan, Tuan A. Dang, Joan M. Coveleskie, Frank A. Schwab, Dale E. Benjamin, David C. Sheppeck
  • Publication number: 20100283005
    Abstract: Nanoparticles include or consist essentially of (i) a core that itself includes or consists essentially of a first material, and (ii) a layer including or consisting essentially of a second material. In various embodiments, one of the first and second materials is a semiconductor material incorporating ions from group 13 and group 15 of the periodic table, and the other of the first and second materials is a metal oxide material incorporating metal ions selected from any one of groups 1 to 12, 14 and 15 of the periodic table. In other embodiments, one of the first and second materials is a semiconductor material, and the other of the first and second materials is an oxide of a metal selected from any one of groups 3 to 10 of the periodic table. Methods for preparing such nanoparticles are also described.
    Type: Application
    Filed: September 26, 2008
    Publication date: November 11, 2010
    Applicant: NANOCO TECHNOLOGIES LIMITED
    Inventors: Nigel Pickett, Steven Daniels, Imrana Mushtaq
  • Publication number: 20100224831
    Abstract: Disclosed are a nanoparticle-doped porous bead with a highly enhanced photoluminescence without wavelength shift and improved durability, and a fabrication method thereof, the nanoparticle-doped porous bead comprising porous beads, and nanoparticles radially bonded onto homocentric spheres of the porous beads by an electrostatic attractive force, the homocentric sphere located inside the porous bead near a surface thereof, wherein the nanoparticles are photoluminescent nanoparticles or mixed nanoparticles of photoluminescent nanoparticles and another nanoparticles, wherein the another nanoparticle is one or more than two mixed, selected from a group consisting of magnetic nanoparticle, metallic nanoparticle and metal oxide nanoparticle.
    Type: Application
    Filed: November 16, 2009
    Publication date: September 9, 2010
    Inventors: Kyoungja WOO, Myungje CHO
  • Publication number: 20100193740
    Abstract: A method of producing an electroluminescence phosphor, which contains the steps of: mixing a phosphor matrix, a flux, an activator, and a particle diameter-controlling additive that does not enter into a crystal lattice of the phosphor matrix, to give a mixture; and baking the mixture, to produce the electroluminescence phosphor, the method containing the step of: adding an acidic or alkaline solution, to remove the particle diameter-controlling additive from the phosphor; an electroluminescence phosphor, which is produced by the method; and an electroluminescence device, which contains the electroluminescence phosphor.
    Type: Application
    Filed: April 5, 2010
    Publication date: August 5, 2010
    Applicant: Fujifilm Corporation
    Inventor: Masashi Shirata
  • Publication number: 20100171077
    Abstract: The present invention provides new compositions containing nearly monodisperse colloidal core/shell semiconductor nanocrystals with high photoluminescence quantum yields (PL QY), as well as other complex structured semiconductor nanocrystals. This invention also provides new synthetic methods for preparing these nanocrystals, and new devices comprising these compositions. In addition to core/shell semiconductor nanocrystals, this patent application also provides complex semiconductor nanostructures, quantum shells, quantum wells, doped nanocrystals, and other multiple-shelled semiconductor nanocrystals.
    Type: Application
    Filed: March 11, 2010
    Publication date: July 8, 2010
    Inventors: Xiaogang Peng, Jianqing Li, David Battaglia, Y. Andrew Wang, Yunjun Wang
  • Publication number: 20100163800
    Abstract: The present invention provides new compositions containing nearly monodisperse colloidal core/shell semiconductor nanocrystals with high photoluminescence quantum yields (PL QY), as well as other complex structured semiconductor nanocrystals. This invention also provides new synthetic methods for preparing these nanocrystals, and new devices comprising these compositions. In addition to core/shell semiconductor nanocrystals, this patent application also provides complex semiconductor nanostructures, quantum shells, quantum wells, doped nanocrystals, and other multiple-shelled semiconductor nanocrystals.
    Type: Application
    Filed: March 10, 2010
    Publication date: July 1, 2010
    Inventors: Xiaogang Peng, Jianqing Li, David Battaglia, Y. Andrew Wang, Yunjun Wang