Patents by Inventor Xiaofan Ren

Xiaofan Ren 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: 11370967
    Abstract: A light emitting apparatus affording high quality colors and energy economy and an electronic device comprising the light emitting apparatus.
    Type: Grant
    Filed: October 14, 2016
    Date of Patent: June 28, 2022
    Assignee: DOW GLOBAL TECHNOLOGIES LLC
    Inventors: Yang Li, Xiuyan Wang, Yan Huang, Xiaofan Ren, Bo Lv
  • Publication number: 20200317999
    Abstract: A light emitting apparatus affording high quality colors and energy economy and an electronic device comprising the light emitting apparatus.
    Type: Application
    Filed: June 6, 2016
    Publication date: October 8, 2020
    Inventors: Xiuyan WANG, Yang LI, Xiaofan REN, Bo LV, Nan HU, Peter TREFONAS, III, Yongcheol KIM, Yan HUANG
  • Publication number: 20200299573
    Abstract: A method of preparing a semiconductor nanocrystal-silicate composite without significantly reducing the quantum yield of the semiconductor nanocrystal, a composite prepared from the method, and a film and an electronic device comprising the composite.
    Type: Application
    Filed: March 30, 2016
    Publication date: September 24, 2020
    Inventors: Bo Lv, Xiuyan Wang, Yan Huang, Xiaofan Ren, Jake Joo, Ping Zhu
  • Publication number: 20190241801
    Abstract: A light emitting apparatus affording high quality colors and energy economy and an electronic device comprising the light emitting apparatus.
    Type: Application
    Filed: October 14, 2016
    Publication date: August 8, 2019
    Inventors: Yang LI, Xiuyan WANG, Yan HUANG, Xiaofan REN, Bo LV
  • Publication number: 20190071599
    Abstract: Light emitting nanoparticles have improved photostability, thermal stability and emission properties, and a process of preparing the nanoparticles.
    Type: Application
    Filed: November 11, 2015
    Publication date: March 7, 2019
    Applicants: Dow Global Technologies LLC, Rohm and Haas Electronic Materials LLC, Rohm and Haas Electronic Materials LLC
    Inventors: Xiuyan Wang, Bo Lu, Yang Li, Nan Hu, Xiaofan Ren, Peter Trefonas, III, Yuanqiao Rao
  • Patent number: 8247088
    Abstract: An OLED device including a cathode, an anode, and having therebetween a phosphorescent light-emitting layer that contains a light-emitting organometallic complex including a precious metal, a first ligand including an imidazole group and a second nitrogen heterocycle group, and at least one second different ligand.
    Type: Grant
    Filed: August 28, 2008
    Date of Patent: August 21, 2012
    Assignee: Global OLED Technology LLC
    Inventors: Xiaofan Ren, Joseph C. Deaton, David J. Giesen
  • Publication number: 20120205586
    Abstract: A method of making a colloidal solution of indium phosphide semiconductor nanocrystals, includes forming a first solution by combining solvents and ligands; and heating the first solution to a temperature equal to or higher than 290° C. and, while heating, adding to the first solution, a second solution containing trialkylindium, a phosphorus precursor and solvents and ligands so that a reaction takes place that forms a colloidal solution of indium phosphide semiconductor nanocrystals. The method further includes forming core shell indium phosphide semiconductor nanocrystals by forming semiconducting shells on the nanocrystals.
    Type: Application
    Filed: February 10, 2011
    Publication date: August 16, 2012
    Inventors: Xiaofan Ren, Keith Brian Kahen, Matthew Holland
  • Patent number: 8242515
    Abstract: An optoelectronic device including two spaced apart electrodes; and at least one layer containing ternary core/shell nanocrystals disposed between the spaced electrodes and having ternary semiconductor cores containing a gradient in alloy composition and wherein the ternary core/shell nanocrystals exhibit single molecule non-blinking behavior characterized by on times greater than one minute or radiative lifetimes less than 10 ns.
    Type: Grant
    Filed: June 1, 2010
    Date of Patent: August 14, 2012
    Assignee: Eastman Kodak Company
    Inventors: Keith B. Kahen, Xiaofan Ren
  • Patent number: 8034465
    Abstract: An organic light-emitting device comprising an anode; a cathode; a hole-transporting layer disposed between the anode and the cathode; a phosphorescent light-emitting layer disposed between the hole-transporting layer and the cathode, wherein the phosphorescent light-emitting layer includes at least one host and at least one phosphorescent dopant; a first exciton-blocking layer disposed between the hole-transporting layer and the phosphorescent light-emitting layer; wherein the first exciton-blocking layer has a triplet energy greater than the triplet energy of the host in the phosphorescent light-emitting layer; and a second exciton-blocking layer disposed between the first exciton-blocking layer and the phosphorescent light-emitting layer, wherein the second exciton-blocking layer is in contact with the phosphorescent light-emitting layer, and wherein the second exciton-blocking layer has a triplet energy less than the triplet energy of the first exciton-blocking layer.
    Type: Grant
    Filed: June 20, 2007
    Date of Patent: October 11, 2011
    Assignee: Global OLED Technology LLC
    Inventors: Liang-Sheng Liao, Xiaofan Ren, Cynthia A. Pellow, Yuan-Sheng Tyan
  • 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
  • Publication number: 20110175054
    Abstract: A device using a layer containing emitting semiconductor nanocrystals wherein each emitting nanocrystal includes a core structure wherein the cores have an aspect ratio less than 2:1 and a diameter greater than 10 nanometers and a protective shell surrounding the core
    Type: Application
    Filed: January 15, 2010
    Publication date: July 21, 2011
    Inventors: XIAOFAN REN, KEITH B. KAHEN
  • Publication number: 20110073835
    Abstract: A film comprised of semiconductor nanocrystals having an aspect ratio less than 3:1 and a diameter greater than 10 nanometers, wherein the film has less than 5% by volume of organic material.
    Type: Application
    Filed: September 29, 2009
    Publication date: March 31, 2011
    Inventors: Xiaofan Ren, Keith B. Kahen
  • Publication number: 20110076839
    Abstract: A method of making a film of large II-VI nanocrystals, including: providing a mixture of column II, column VI chemical precursors, and coordinating solvents selected from amines, phosphines, phosphine oxides, esters, ethers, or combinations thereof by: injecting under heat a higher molar quantity of column II chemical precursor than column VI chemical precursor; and ii) increasing the ratio of column VI to column II chemical precursors during the course of the reaction while still heating the mixture until the molar ratio of column VI chemical precursor to column II chemical precursor is in a range of 1 to 10; heating the mixture to grow large nanocrystals functionalized with coordinating ligands; washing the grown nanocrystals to remove the unreacted precursors and excess coordinating solvents; and d) depositing the large II-VI nanocrystals on a substrate in order to form the film.
    Type: Application
    Filed: September 29, 2009
    Publication date: March 31, 2011
    Inventors: Xiaofan Ren, Keith B. Kahen
  • Publication number: 20100289001
    Abstract: An optoelectronic device including two spaced apart electrodes; and at least one layer containing ternary core/shell nanocrystals disposed between the spaced electrodes and having ternary semiconductor cores containing a gradient in alloy composition and wherein the ternary core/shell nanocrystals exhibit single molecule non-blinking behavior characterized by on times greater than one minute or radiative lifetimes less than 10 ns.
    Type: Application
    Filed: June 1, 2010
    Publication date: November 18, 2010
    Inventors: Keith B. Kahen, Xiaofan Ren
  • Publication number: 20100289003
    Abstract: A method of making a colloidal solution of ternary semiconductor nanocrystals, includes providing binary semiconductor cores; forming first shells on the binary semiconductor cores containing one of the components of the binary semiconductor cores and another component which when combined with the binary semiconductor will form a ternary semiconductor, thereby providing core/shell nanocrystals; and annealing the core/shell nanocrystals to form ternary semiconductor nanocrystals containing a gradient in alloy composition.
    Type: Application
    Filed: October 29, 2007
    Publication date: November 18, 2010
    Inventors: Keith B. Kahen, Xiaofan Ren
  • Patent number: 7777233
    Abstract: An optoelectronic device including two spaced apart electrodes; and at least one layer containing ternary core/shell nanocrystals disposed between the spaced electrodes and having ternary semiconductor cores containing a gradient in alloy composition and wherein the ternary core/shell nanocrystals exhibit single molecule non-blinking behavior characterized by on times greater than one minute or radiative lifetimes less than 10 ns.
    Type: Grant
    Filed: October 30, 2007
    Date of Patent: August 17, 2010
    Assignee: Eastman Kodak Company
    Inventors: Keith B. Kahen, Xiaofan Ren
  • Patent number: 7736756
    Abstract: An OLED device comprises a cathode, an anode, and has therebetween a light emitting layer comprising a phosphorescent emitter represented by Formula (I): LnM??(I) wherein each L is a cyclometallated ligand with at least one containing a coumarin group, M is Ir or Pt, and n is 3 when M is Ir and 2 when M is Pt. The invention also comprised the compound of formula (I).
    Type: Grant
    Filed: March 1, 2007
    Date of Patent: June 15, 2010
    Assignee: Global OLED Technology LLC
    Inventors: Xiaofan Ren, Shouquan Huo
  • Patent number: 7718276
    Abstract: An OLED device comprises a cathode, an anode, and has therebetween a light emitting layer comprising a phosphorescent emitter represented by Formula (I): LnM??(I) wherein each L is a cyclometallated ligand with at least one containing a coumarin group, M is Ir or Pt, and n is 3 when M is Ir and 2 when M is Pt. The invention also comprised the compound of formula (I).
    Type: Grant
    Filed: July 18, 2006
    Date of Patent: May 18, 2010
    Assignee: Global OLED Technology LLC
    Inventors: Xiaofan Ren, Shouquan Huo
  • Publication number: 20100052516
    Abstract: An OLED device including a cathode, an anode, and having therebetween a phosphorescent light-emitting layer that contains a light-emitting organometallic complex including a precious metal, a first ligand including an imidazole group and a second nitrogen heterocycle group, and at least one second different ligand.
    Type: Application
    Filed: August 28, 2008
    Publication date: March 4, 2010
    Inventors: Xiaofan Ren, Joseph C. Deaton, David J. Giesen
  • Patent number: 7588839
    Abstract: An OLED device comprises a cathode and an anode and has located therebetween a light-emitting layer comprising a phosphorescent light-emitting material and a host comprising a compound of a tetravalent atom wherein the four groups bonded to the atom are aromatic rings, at least one of which contains an electron-withdrawing group (EWG) substituent comprising at least three atoms, the compound having a triplet energy of at least 2.7 eV and a LUMO energy within 0.6 eV of the LUMO energy of at least one material in an adjacent layer on the cathode side of the light-emitting layer. Particular embodiments include certain tetravalent silicon compounds. The light-emitting layer emits blue light and provides good luminance and reduced drive voltage.
    Type: Grant
    Filed: October 19, 2005
    Date of Patent: September 15, 2009
    Assignee: Eastman Kodak Company
    Inventors: Xiaofan Ren, Christopher T. Brown