Patents by Inventor Daniel N. Congreve

Daniel N. Congreve 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).

  • Publication number: 20220305724
    Abstract: Articles and methods for increasing the triplet upconversion threshold, e.g., by utilizing a triplet exciton acceptor lower in energy than the sensitizer or upconverter, are generally described. Some embodiments, for example, are directed to articles and methods that use a triplet sensitizer, an upconverter, and an acceptor to produce upconverted photons (e.g., light of a second energy). The light can be used to polymerize a polymerizable species. Other upconversion configurations can also be used in other embodiments. In some cases, this may allow true 3D printing to be achieved due to improved control of light absorption, e.g., without needing to “print” on a layer-by-layer basis.
    Type: Application
    Filed: June 17, 2020
    Publication date: September 29, 2022
    Applicant: President and Fellows of Harvard College
    Inventors: Daniel N. Congreve, Samuel N. Sanders
  • Publication number: 20220025255
    Abstract: The present invention generally relates to photon upconversion nanocapsules for 3D printing and other applications. For example, one aspect is generally related to nanocapsules that contain an upconversion material. Light, such as laser light, focused on a region of liquid containing nanocapsules may be upconverted by the upconversion material to produce wavelengths sufficient to cause polymerization of a polymerizable entity to occur. However, in contrast, although other regions may receive some light, that light may not be of sufficient focus or intensity to be upconverted, and thus, the polymerizable entity in those regions would generally not polymerize. In such a fashion, the extent of polymerization can be controlled, for example, by controlling where light is applied to the liquid. The light could be focused at arbitrary regions within the liquid, thus allowing true 3D-printing to occur.
    Type: Application
    Filed: November 27, 2019
    Publication date: January 27, 2022
    Applicant: President and Fellows of Harvard College
    Inventors: Daniel N. Congreve, Samuel N. Sanders, Richard Christopher Stokes, Mahesh Kumar Gangishetty
  • Patent number: 10980883
    Abstract: Various exemplary photoreactions can be provided, including reactions generally based on triplet-triplet annihilation upconversion. Representative photosensitizers include PdPc(OBu)8 and PtTPTNP. Representative annihilators include FDPP and TTBP. Such exemplary photoreactions, systems and methods may be used in a variety of applications, including various biological or physical applications. Exemplary methods can also be provided for making or using such systems, photoreactions, kits including such systems, or the like.
    Type: Grant
    Filed: March 12, 2019
    Date of Patent: April 20, 2021
    Assignees: The Trustees of Columbia University in the City of New York, President and Fellows of Harvard College
    Inventors: Luis M. Campos, Daniel N. Congreve, Andrew Brian Pun, Kealan Fallon, Emily Marie Churchill, Tomislav Rovis, Benjamin Ravetz
  • Patent number: 10794771
    Abstract: The present invention generally relates to composition and methods for downconverting light. In some embodiments, the composition and methods comprise an organic material, a nanocrystal, and a ligand capable of facilitating energy transfer between the organic material and the nanocrystal. In certain embodiments, the nanocrystal has a first excited energy state with an energy less than a triplet energy state of the organic material. The organic material, in some embodiments, may be aromatic and/or include one or more pi-conjugated carbon-carbon double bonds. In some cases, incident light may be absorbed by the organic material to produce two triplet excitons. The triplet excitons may then transfer to the nanocrystal via the ligand, where they can undergo recombination, resulting in the formation low energy photons.
    Type: Grant
    Filed: February 16, 2016
    Date of Patent: October 6, 2020
    Assignee: Massachusetts Institute of Technology
    Inventors: Daniel N. Congreve, Nicholas John Thompson, Mark W. B. Wilson, Mengfei Wu, Marc A. Baldo, Moungi G. Bawendi, Vladimir Bulovic
  • Patent number: 9944847
    Abstract: The present invention generally relates to composition and methods for upconverting light. In some embodiments, the composition and methods comprise an organic material, a nanocrystal, and a ligand capable of facilitating energy transfer between the nanocrystal and the organic material. In certain embodiments, the nanocrystal has a first excited energy state with an energy greater than a triplet state of the organic material. The organic material, in some embodiments, may be aromatic and/or include one or more pi-conjugated carbon-carbon double bonds. In some cases, incident light may be absorbed by the nanocrystal to produce triplet excitons. The triplet excitons may then transfer from the nanocrystal to the organic material and undergo triplet-triplet annihilation, creating a singlet state of approximately twice the energy of the triplet exciton. In certain embodiments, the singlet state fluoresces, resulting in the formation of a high energy photon.
    Type: Grant
    Filed: February 16, 2016
    Date of Patent: April 17, 2018
    Assignee: Massachusetts Institute of Technology
    Inventors: Marc A. Baldo, Daniel N. Congreve, Nicholas John Thompson, Mark W. B. Wilson, Mengfei Wu, Moungi G. Bawendi, Vladimir Bulovic
  • Publication number: 20160238455
    Abstract: The present invention generally relates to composition and methods for downconverting light. In some embodiments, the composition and methods comprise an organic material, a nanocrystal, and a ligand capable of facilitating energy transfer between the organic material and the nanocrystal. In certain embodiments, the nanocrystal has a first excited energy state with an energy less than a triplet energy state of the organic material. The organic material, in some embodiments, may be aromatic and/or include one or more pi-conjugated carbon-carbon double bonds. In some cases, incident light may be absorbed by the organic material to produce two triplet excitons. The triplet excitons may then transfer to the nanocrystal via the ligand, where they can undergo recombination, resulting in the formation low energy photons.
    Type: Application
    Filed: February 16, 2016
    Publication date: August 18, 2016
    Applicant: Massachusetts Institute of Technology
    Inventors: Daniel N. Congreve, Nicholas John Thompson, Mark W.B. Wilson, Mengfei Wu, Marc A. Baldo, Moungi G. Bawendi, Vladimir Bulovic
  • Publication number: 20160237343
    Abstract: The present invention generally relates to composition and methods for upconverting light. In some embodiments, the composition and methods comprise an organic material, a nanocrystal, and a ligand capable of facilitating energy transfer between the nanocrystal and the organic material. In certain embodiments, the nanocrystal has a first excited energy state with an energy greater than a triplet state of the organic material. The organic material, in some embodiments, may be aromatic and/or include one or more pi-conjugated carbon-carbon double bonds. In some cases, incident light may be absorbed by the nanocrystal to produce triplet excitons. The triplet excitons may then transfer from the nanocrystal to the organic material and undergo triplet-triplet annihilation, creating a singlet state of approximately twice the energy of the triplet exciton. In certain embodiments, the singlet state fluoresces, resulting in the formation of a high energy photon.
    Type: Application
    Filed: February 16, 2016
    Publication date: August 18, 2016
    Applicant: Massachusetts Institute of Technology
    Inventors: Marc A. Baldo, Daniel N. Congreve, Nicholas John Thompson, Mark W.B. Wilson, Mengfei Wu, Moungi G. Bawendi, Vladimir Bulovic
  • Publication number: 20140224329
    Abstract: Embodiments described herein relate to devices containing photoactive materials that, in some cases, undergo singlet fission. In some cases, the devices (e.g., solar cells) can efficiently convert photonic energy into usable electricity, with external quantum efficiencies greater than 100% in the visible region.
    Type: Application
    Filed: December 4, 2013
    Publication date: August 14, 2014
    Applicant: Massachusetts Institute of Technology
    Inventors: Daniel N. Congreve, Marc A. Baldo, Nicholas John Thompson