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Methods and compositions for the upconversion of light

United States Patent

April 17, 2018
View the Complete Patent at the US Patent & Trademark Office
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.
Baldo; Marc A. (Lexington, MA), Congreve; Daniel N. (Cambridge, MA), Thompson; Nicholas John (Hamilton, NJ), Wilson; Mark W. B. (Somerville, MA), Wu; Mengfei (Cambridge, MA), Bawendi; Moungi G. (Cambridge, MA), Bulovic; Vladimir (Lexington, MA)
Massachusetts Institute of Technology (Cambridge, MA)
15/ 045,028
February 16, 2016
GOVERNMENT FUNDING This invention was made with Government support under Grant No. DE-SC0001088 awarded by the Department of Energy. The Government has certain rights in the invention.