Systems and methods for quantum dot on nanoplatelet heterostructures with tunable emission in the shortwave infrared
AssigneeThe Regents of the University of California
InventorsJustin Caram, Stephanie Tenney
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Abstract
Many embodiments implement quantum confined nanoplatelets (NPLs) that can be induced to emit bright and tunable infrared emission from attached quantum dot (QD). Some embodiments provide mesoscale NPLs with a largest dimension of greater than 1 micron. Certain embodiments provide methods for growing mesoscale NPLs and QD on mesoscale NPLs heterostructures. Several embodiments provide near unity energy transfer from NPLs to QDs, which can quench NPL emission and emit with high quantum yield through the shortwave infrared. The QD defect emission can be kinetically tunable, enabling controlled mid-gap emission from NPLs.
Claims17
A tunable light emitter comprising:
- a nanoplatelet heterostructure, wherein the nanoplatelet heterostructure comprises at least two monolayers of a II-VI semiconductor material;
- and
- at least one quantum dot on a first surface of the nanoplatelet heterostructure;
- wherein the at least one quantum dot tunes emission of the nanoplatelet heterostructure and the nanoplatelet heterostructure emits in wavelength range from 900 nm to 1500 nm.
A method of synthesizing a nanoplatelet heterostructure, comprising:
- providing at least one II-VI semiconductor seed, wherein the seed comprises at least one nanoplatelet;
- suspending the at least one II-VI semiconductor seed in a solution;
- adding at least one metal precursor in the solution;
- adding at least one chalcogen precursor to the solution at an injection rate;
- heating the solution to at least 180° C.;
- cooling the heated solution;
- and
- precipitating the nanoplatelet heterostructure;
- wherein the nanoplatelet heterostructure has a lateral dimension of at least 1 micron;
- and
- wherein the chalcogen precursor is tri-n-octylphosphine sulfide or tri-n-octylphosphine telluride.
Dependencies are inferred from the claim text.