Title: Compositions and methods for the downconversion of light

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.

Inventors:

Congreve, Daniel N.; Thompson, Nicholas John; Wilson, Mark W. B.; Wu, Mengfei; Baldo, Marc A.; Bawendi, Moungi G.; Bulovic, Vladimir

Issue Date:

2020-10-06

Research Org.:

Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)

Sponsoring Org.:

USDOE

OSTI Identifier:

1771472

Patent Number(s):

10794771

Application Number:

15/045,011

Assignee:

Massachusetts Institute of Technology (Cambridge, MA)

Patent Classifications (CPCs):

C - CHEMISTRY C09 - DYES C09K - MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE

H - ELECTRICITY H01 - BASIC ELECTRIC ELEMENTS H01L - SEMICONDUCTOR DEVICES

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C - CHEMISTRY C09 - DYES C09K - MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE

C09K11/661 - {Chalcogenides}

H - ELECTRICITY H01 - BASIC ELECTRIC ELEMENTS H01L - SEMICONDUCTOR DEVICES

H01L51/5016 - {Triplet emission}
H01L2251/5369 - Nanoparticles used in whatever layer except emissive layer, e.g. in packaging
H01L51/5028 - {for assisting energy transfer, e.g. sensitization}
H01L51/5012 - {Electroluminescent [EL] layer}

G - PHYSICS G01 - MEASURING G01J - MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRA-RED, VISIBLE OR ULTRA-VIOLET LIGHT

G01J9/00 - Measuring optical phase difference

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DOE Contract Number:  

SC0001088

Resource Type:

Patent

Resource Relation:

Patent File Date: 02/16/2016

Country of Publication:

United States

Language:

English