Patents Assigned to Evident Technologies, Inc.
  • Patent number: 9227846
    Abstract: Disclosed herein is a method of purifying and doping a population of semiconductor nanocrystals. The method includes mixing the population of semiconductor nanocrystals having a first material system and a first ligand with a set of particles in the presence of a first solvent, the set of particles having a second material system which is different from the first material system and a second ligand which is different from the first ligand, to form a mixture. The method also includes facilitating a ligand exchange and an ionic exchange in the mixture, altering the first material system of the population of semiconductor nanocrystals to a third material system, different from the first material system and the second material system. The method includes sonicating the mixture and isolating the population of semiconductor nanocrystals having the third material system and the second ligand from the mixture.
    Type: Grant
    Filed: February 25, 2014
    Date of Patent: January 5, 2016
    Assignee: Evident Technologies, Inc.
    Inventors: Adam Z. Peng, Gregg Bosak, Clinton T. Ballinger, Katie Fiske, Susanthri Perera
  • Patent number: 9209374
    Abstract: Disclosed are a thermoelectric material and a method of forming a thermoelectric material having an optimal stoichiometry, the method including obtaining a first precursor material, wherein the first precursor material is an antimony precursor, and obtaining a second precursor material, wherein the second precursor is chosen from the group consisting of a tellurium precursor and a selenium precursor. The method further includes combining the precursor materials, heating the combination of precursor materials, and isolating a plurality of semiconductor nanocrystals from the heated precursor materials.
    Type: Grant
    Filed: March 25, 2013
    Date of Patent: December 8, 2015
    Assignee: Evident Technologies, Inc.
    Inventors: Adam Z. Peng, Susanthri Perera, Dave Socha, Clinton T. Ballinger
  • Patent number: 8828774
    Abstract: Herein disclosed is a method of forming a thermoelectric material having an optimized stoichiometry, the method comprising: reacting a precursor material including a population of nanocrystals with a first ionic solution and a second ionic solution to form a reacted mixture.
    Type: Grant
    Filed: April 19, 2013
    Date of Patent: September 9, 2014
    Assignee: Evident Technologies Inc.
    Inventors: Susanthri Perera, Dave Socha, Adam Z. Peng, Clinton T. Ballinger
  • Patent number: 8728434
    Abstract: Disclosed herein is a method of synthesizing a nanocrystal. The method can include reacting a bismuth material, an antimony material, and a ligand together with a heat source. The method may also include injecting a sulfur precursor at a predetermined temperature and maintaining the predetermined temperature for a predetermined amount of time to form a plurality of precursor nanocrystals. The precursor nanocrystals may include Bi0.5Sb1.5S3 nanocrystals.
    Type: Grant
    Filed: June 28, 2013
    Date of Patent: May 20, 2014
    Assignee: Evident Technologies, Inc.
    Inventors: Clinton T. Ballinger, Gregg Bosak, Katie Fiske, Luke Nally, Adam Z. Peng, Susanthri Perera, Alfred Waring
  • Publication number: 20130280843
    Abstract: Herein disclosed is a method of forming a thermoelectric material having an optimized stoichiometry, the method comprising: reacting a precursor material including a population of nanocrystals with a first ionic solution and a second ionic solution to form a reacted mixture.
    Type: Application
    Filed: April 19, 2013
    Publication date: October 24, 2013
    Applicant: Evident Technologies, Inc.
    Inventors: Susanthri Perera, Dave Socha, Adam Z. Peng, Clinton T. Ballinger
  • Publication number: 20130260135
    Abstract: Disclosed is a method of consolidating a powder. The method can include obtaining a powder of semiconductor nanocrystals, obtaining a material which will form a gas when heated, and combining the powder and the material into a combined powder. The method can also include consolidating the powder by applying heat and pressure to the combined powder.
    Type: Application
    Filed: March 29, 2013
    Publication date: October 3, 2013
    Applicant: Evident Technologies, Inc.
    Inventors: Clinton T. Ballinger, Adam Z. Peng, Susanthri Perera
  • Publication number: 20130252406
    Abstract: Embodiments of the invention include a method of producing a low contaminant, stoichiometrically controlled semiconductor material, the method comprising providing a colloidal suspension of a plurality of colloidally grown semiconductor nanocrystals, providing an inorganic ligand structure around a surface of the semiconductor nanocrystals of the plurality of semiconductor nanocrystals, drying the colloidal suspension into a powder, and pre-annealing the powder into a semiconductor material.
    Type: Application
    Filed: March 25, 2013
    Publication date: September 26, 2013
    Applicant: Evident Technologies, Inc.
    Inventors: Clinton T. Ballinger, Adam Z. Peng, Susanthri Perera, Dave Socha
  • 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: 8409475
    Abstract: A semiconductor nanocrystal composite comprising a semiconductor nanocrystal composition dispersed in an inorganic matrix material and a method of making same are provided. The method includes providing a semiconductor nanocrystal composition having a semiconductor nanocrystal core, providing a surfactant formed on the outer surface of the composition, and replacing the surfactant with an inorganic matrix material. The semiconductor nanocrystal composite emits light having wavelengths between about 1 and about 10 microns.
    Type: Grant
    Filed: September 4, 2007
    Date of Patent: April 2, 2013
    Assignee: Evident Technologies, Inc.
    Inventors: Michael LoCasio, Jennifer Gillies, Margaret Hines
  • Patent number: 8050303
    Abstract: A laser gain medium. The novel laser gain medium includes a host material, a plurality of quantum dots dispersed throughout the host material, and a plurality of laser active ions surrounding each of the quantum dots. The laser active ions are disposed in close proximity to the quantum dots such that energy absorbed by the quantum dots is non-radiatively transferred to the ions via a Forster resonant energy transfer, thereby exciting the ions to produce laser output. In an illustrative embodiment, each quantum dot is surrounded by an external shell doped with the laser active ions.
    Type: Grant
    Filed: April 12, 2006
    Date of Patent: November 1, 2011
    Assignees: Raytheon Company, Evident Technologies, Inc.
    Inventors: Kalin Spariosu, Alexander A. Betin, Michael LoCascio, Wei Liu
  • Patent number: 7804587
    Abstract: A system and method for distinguishing a first light source from other light sources utilizes an image receiver that can selectively engage and disengage a filter. The filter can be configured to either block bands of light corresponding to the light being emitted by either the first source or the other sources. By sequentially engaging and disengaging the filter from the image receiver, the first light source may be distinguished from other light sources.
    Type: Grant
    Filed: October 3, 2007
    Date of Patent: September 28, 2010
    Assignee: Evident Technologies, Inc.
    Inventors: Luis A. Sanchez, James Hayes, Clinton T. Ballinger, Eva Sbardella
  • Patent number: 7785657
    Abstract: A first population of semiconductor nanocrystals to create electron transport conduits, a second population so semiconductor nanocrystals to create hole transport conduits; and a third population of semiconductor nanocrystals to be used for either light absorption or light emission can be combined to form an inorganic nanostructure layer.
    Type: Grant
    Filed: December 11, 2007
    Date of Patent: August 31, 2010
    Assignee: Evident Technologies, Inc.
    Inventors: Michael LoCascio, San Ming Yang
  • Patent number: 7777870
    Abstract: A system and method for distinguishing a first light source from other light sources utilizes an image receiver that can selectively engage and disengage a filter. The filter can be configured to block bands of light corresponding to the light being emitted by either the first source or the other sources. By alternately engaging and disengaging the filter from the image receiver, the first light source may be distinguished from other light sources.
    Type: Grant
    Filed: January 21, 2008
    Date of Patent: August 17, 2010
    Assignee: Evident Technologies, Inc.
    Inventors: James C. M. Hayes, Luis A. Sanchez, Eva Marie Sackal, Clinton T. Ballinger
  • Patent number: 7754329
    Abstract: A water-stable semiconductor nanocrystal complex and methods of making the same are provided. The water-stable semiconductor nanocrystal complex includes a semiconductor nanocrystal composition, a surfactant layer, and an outer layer. The outer layer and/or the surfactant layer can be cross-linked.
    Type: Grant
    Filed: March 8, 2007
    Date of Patent: July 13, 2010
    Assignee: Evident Technologies, Inc.
    Inventors: Wei Liu, Daniel Landry, Michael LoCascio
  • Patent number: 7723744
    Abstract: Light-emitting devices are provided that incorporate one or more underlying LED chips or other light sources and a layer having one or more populations of nanoparticles disposed over the light source. The nanoparticles may absorb some light emitted by the underlying source, and re-emit light at a different level. By varying the type and relative concentration of nanoparticles, different emission spectra may be achieved. White light and specialty-color emission may be achieved. Devices also may include multiple LED chips, with nanoparticles disposed over one or more underlying chips in an array.
    Type: Grant
    Filed: December 7, 2007
    Date of Patent: May 25, 2010
    Assignee: Evident Technologies, Inc.
    Inventors: Jennifer Gillies, David Socha, Kwang-Ohk Cheon, Michael LoCasio
  • Patent number: 7524746
    Abstract: A high-refractive index material that includes semiconductor nanocrystal compositions. The high-refractive index material has at least one semiconductor nanocrystal composition incorporated in a matrix material and has a refractive index greater than 1.5. The semiconductor nanocrystal composition has a semiconductor nanocrystal core of a II-VI, III-V, or IV-VI semiconductor material. A method of making a high-refractive index material includes incorporating, at least one semiconductor nanocrystal composition in a matrix material. An application of a high-refractive index material includes incorporating at least one semiconductor nanocrystal composition in a matrix material to form the high-refractive index material and depositing the high-refractive index material on the surface of a lighting device.
    Type: Grant
    Filed: March 8, 2007
    Date of Patent: April 28, 2009
    Assignee: Evident Technologies, Inc.
    Inventors: Michael Locascio, Jennifer Gillies, Margaret Hines
  • Patent number: 7399429
    Abstract: A semiconductor nanocrystal complex that is stable and has high luminescent quantum yield. The semiconductor nanocrystal complex has a semiconductor nanocrystal core of a III-V semiconductor nanocrystal material. A method of making a semiconductor nanocrystal complex is also provided. The method includes synthesizing a semiconductor nanocrystal core of a III-V semiconductor nanocrystal material, and forming a metal layer on the semiconductor nanocrystal core after synthesis of the semiconductor nanocrystal core.
    Type: Grant
    Filed: May 10, 2005
    Date of Patent: July 15, 2008
    Assignee: Evident Technologies, Inc.
    Inventors: Wei Liu, Adam Peng, Daniel Landry
  • Publication number: 20080107911
    Abstract: A water-stable semiconductor nanocrystal complex and methods of making the same are provided. The water-stable semiconductor nanocrystal complex includes a semiconductor nanocrystal composition, a surfactant layer, and an outer layer. The outer layer and/or the surfactant layer can be cross-linked.
    Type: Application
    Filed: March 8, 2007
    Publication date: May 8, 2008
    Applicant: Evident Technologies, Inc.
    Inventors: Wei Liu, Daniel Landry, Michael Locascio
  • Publication number: 20060014040
    Abstract: A semiconductor nanocrystal complex including a metal layer formed on the outer surface of a semiconductor nanocrystal core after synthesis of the semiconductor nanocrystal core and a method for preparing a nanocrystal complex comprising forming a metal layer on a semiconductor nanocrystal core after synthesis of the semiconductor nanocrystal core. The metal layer may passivate the surface of the semiconductor nanocrystal core and protect the semiconductor nanocrystal core from the effects of oxidation. Also provided is a semiconductor nanocrystal complex with a shell grown onto the metal layer formed on the semiconductor nanocrystal core. In this embodiment, the metal layer may prevent lattice mismatch between the semiconductor shell and the semiconductor nanocrystal core.
    Type: Application
    Filed: May 10, 2005
    Publication date: January 19, 2006
    Applicant: Evident Technologies, Inc.
    Inventors: Adam Peng, Wei Liu
  • Publication number: 20060001119
    Abstract: A semiconductor nanocrystal complex that is stable and has high luminescent quantum yield. The semiconductor nanocrystal complex has a semiconductor nanocrystal core of a III-V semiconductor nanocrystal material. A method of making a semiconductor nanocrystal complex is also provided. The method includes synthesizing a semiconductor nanocrystal core of a III-V semiconductor nanocrystal material, and forming a metal layer on the semiconductor nanocrystal core after synthesis of the semiconductor nanocrystal core.
    Type: Application
    Filed: May 10, 2005
    Publication date: January 5, 2006
    Applicant: Evident Technologies, Inc.
    Inventors: Wei Liu, Adam Peng, Daniel Landry