Patents by Inventor Sandra De Boer-Douwsma

Sandra De Boer-Douwsma 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).

  • Modulatable light-emitting diode
    Patent number: 9246117
    Abstract: Described is an (organic) light-emitting diode ((O)LED) wherein the light-emitting layer comprises a blend of an electroluminescent semiconducting material with a ferro-electric material. Either of the electrodes forms a modulatable injection barrier with the ferro-electric material, the modulation requiring a voltage Vm serving to polarize or repolarize the ferro-electric material. With Vm being larger than the voltage Ve required for light emission, the (O)LED can be turned “on” or “off” by applying a pulse voltage to (re)polarize the ferro-electric material.
    Type: Grant
    Filed: November 26, 2009
    Date of Patent: January 26, 2016
    Assignees: Nederlandse Organisatie voor toegepast-natuurwetenschappelijk onderzoek TNO, IMEC vzw
    Inventors: Paulus Wilhelmus Maria Blom, Bert De Boer, Sandra De Boer-Douwsma, Kamal Asadi
  • MODULATABLE LIGHT-EMITTING DIODE
    Publication number: 20120126704
    Abstract: Described is an (organic) light-emitting diode ((O)LED) wherein the light-emitting layer comprises a blend of an electroluminescent semiconducting material with a ferro-electric material. Either of the electrodes forms a modulatable injection barrier with the ferro-electric material, the modulation requiring a voltage Vm serving to polarize or repolarize the ferro-electric material. With Vm being larger than the voltage Ve required for light emission, the (O)LED can be turned “on” or “off” by applying a pulse voltage to (re)polarize the ferro-electric material.
    Type: Application
    Filed: November 26, 2009
    Publication date: May 24, 2012
    Inventors: Paulus Wilhelmus Maria Blom, Bert De Boer, Sandra De Boer-Douwsma, Kamal Asadi