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Methods and compositions for the upconversion of light

Patent ·
OSTI ID:1435786
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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.
Research Organization:
Massachusetts Institute of Technology, Cambridge, MA (United States)
Sponsoring Organization:
USDOE
DOE Contract Number:
SC0001088
Assignee:
Massachusetts Institute of Technology (Cambridge, MA)
Patent Number(s):
9,944,847
Application Number:
15/045,028
OSTI ID:
1435786
Country of Publication:
United States
Language:
English

References (10)

Recent Advances in Singlet Fission journal April 2013
Singlet Fission journal November 2010
Efficient photovoltaic energy conversion in tetracene-C60 based heterojunctions journal June 2005
Singlet Fission for Dye-Sensitized Solar Cells:  Can a Suitable Sensitizer Be Found? journal December 2006
Formation of High-Quality CdTe, CdSe, and CdS Nanocrystals Using CdO as Precursor journal January 2001
External Quantum Efficiency Above 100% in a Singlet-Exciton-Fission-Based Organic Photovoltaic Cell journal April 2013
Energy Level Modification in Lead Sulfide Quantum Dot Thin Films through Ligand Exchange journal May 2014
Solid-state infrared-to-visible upconversion sensitized by colloidal nanocrystals journal November 2015
Energy harvesting of non-emissive triplet excitons in tetracene by emissive PbS nanocrystals journal October 2014
A Dynamic Mode Decomposition Based Edge Detection Method for Art Images journal December 2017

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72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS