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US 12,644,047 B2Granted
Macromolecular ammonium and guanidinium halides for tuning color of perovskite nanocrystals
AssigneeUniversity of Massachusetts
InventorsTodd Emrick, Christopher Cueto
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Abstract
A composition includes a plurality of lead halide perovskite nanocrystals and an ammonium halide-containing copolymer or a guanidinium halide-containing copolymer. The ammonium halide-containing copolymer and guanidinium halide-containing copolymer can include repeating units defined herein. The composition can be particularly useful for color tuning perovskite nanocrystals, and can be well-suited for light emitting applications, including light emitting diodes.
Claims20
A composition comprising:
- a plurality of lead halide nanocrystals;
- and
- an ammonium halide-containing copolymer comprising 1 to 10 mole percent of ammonium halide-containing repeating units or a guanidinium halide-containing copolymer comprising 1 to 10 mole percent of guanidinium halide-containing repeating units;
- wherein the ammonium halide-containing copolymer comprises
- repeating units according to Formula I and Formula II
- or repeating units according to Formula (VIII) and Formula (IX)
- wherein in the foregoing formulas
- R1 is independently at each occurrence hydrogen or a C1-8 alkyl group;
- R2 is independently at each occurrence a C1-C8 alkyl group, or a C2-C8 alkenyl group;
- R6 is a substituted or unsubstituted C1-20 alkyl group;
- L is a linking group;
- Rx, Ry, and Rz each independently comprise hydrogen, a substituted or unsubstituted C1-C8 alkyl group, or a substituted or unsubstituted C2-C8 alkenyl group;
- X is a Br, Cl, I, or a combination thereof;
- n is 0 to 5;
- m is 0 to 4;
- and
- q is 1 to 5.
14 more elements
A method of making a composition, the method comprising:
- combining
- a plurality of lead halide nanocrystals;
- and
- an ammonium halide-containing copolymer comprising ammonium-halide containing repeating units in an amount of 1 to 10 mole percent or a guanidinium halide-containing copolymer comprising guanidinium halide-containing repeating units in an amount of 1 to 10 mole percent,
- under conditions effective to provide the composition;
- wherein the ammonium halide-containing copolymer comprises
- repeating units according to Formula I and Formula II
- repeating units according to Formula (VIII) and Formula (IX)
- wherein in the foregoing formulas
- R1 is independently at each occurrence hydrogen or a C1-8 alkyl group;
- R2 is independently at each occurrence a C1-C8 alkyl group, or a C2-C8 alkenyl group;
- R6 is a substituted or unsubstituted C1-20 alkyl group;
- L is a linking group;
- Rx, Ry, and Rz each independently comprise hydrogen, a substituted or unsubstituted C1-C8 alkyl group, or a substituted or unsubstituted C2-C8 alkenyl group;
- X is a Br, Cl, I, or a combination thereof;
- n is 0 to 5;
- m is 0 to 4;
- and
- q is 1 to 5.
16 more elements
Dependencies are inferred from the claim text.