Nanocrystal-metal oxide composites and preparation method thereof
AssigneeSamsung Electronics Co., Ltd.
InventorsShin Ae Jun, Eun Joo Jang
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Abstract
Disclosed herein are nanocrystal-metal oxide composites. The composites comprise nanocrystals and a metal oxide bound to the nanocrystals wherein the metal oxide has organic groups. The composites are stable to mechanical stress and exhibit improved processability. Also disclosed herein is a method for preparing the composites.
Claims16
A nanocrystal-metal oxide composite comprising a nanocrystal and a metal oxide bound to the nanocrystal wherein the metal oxide comprises a compound represented by Formula 1:
- AR1kO-B (1)
- wherein A is N, NH, S, COO−, PO3H− or PO32−,
- R1 is an alkyl group containing at least one carbon atom, an alkenyl group containing at least two carbon atoms, or a cyclic group containing at least three carbon atoms,
- B is one or more repeating units selected from the group consisting of
- MOyR2m, and MOzR3R4n;
- wherein each M is Ti, Zn, Si, Sn, W, Ta, Zr, Hf, Al, Y, Fe, Ce or Cr,
- R2, R3 and R4 are each independently an alkyl group containing at least one carbon atom, an alkenyl group containing at least two carbon atoms, or a heterocyclic group containing at least three carbon atoms and at least one heteroatom selected from the group consisting of N, S, O and P,
- k is an integer from 1 to 20,
- l, m, and n are each independently an integer including 0 and at least one of l, m, or n is greater than 0, and
- x, y, and z are each independently an integer from 1 to 3.
A method for preparing nanocrystal-metal oxide composites, the method comprising:
- modifying the surface of nanocrystals with a surfactant to provide surface-modified nanocrystals, and
- mixing the surface-modified nanocrystals with a metal oxide precursor having organic groups, a solvent and water to form a sol-gel,
- wherein the surfactant is reactive with the metal oxide precursor having organic groups to provide a compound represented by Formula 1:
- AR1kO-B (1)
- wherein A is N, NH, S, COO−, PO3H− or PO32−,
- R1 is an alkyl group containing at least one carbon atom, an alkenyl group containing at least two carbon atoms, or a cyclic group containing at least three carbon atoms,
- B is one or more repeating units selected from the group consisting of MOXl, MOyR2m, and MOzR3R4n;
- wherein each M is Ti, Zn, Si, Sn, W, Ta, Zr, Hf, Al, Y, Fe, Ce or Cr,
- R2, R3 and R4 are each independently an alkyl group containing at least one carbon atom, an alkenyl group containing at least two carbon atoms, or a heterocyclic group containing at least three carbon atoms and at least one heteroatom selected from the group consisting of N, S, O and P,
- k is an integer from 1 to 20,
- l, m, and n are each independently an integer including 0 and at least one of l, m, or n is greater than 0, and
- x, y, and z are each independently an integer from 1 to 3.
A light-emitting diode device comprising nanocrystal-metal oxide composites wherein the composites include nanocrystals and a compound bound to the nanocrystals, the compound being represented by Formula 1:
- AR1kO-B (1)
- wherein A is N, NH, S, COO−, PO3H− or PO32−,
- R1 is an alkyl group containing at least one carbon atom, an alkenyl group containing at least two carbon atoms, or a cyclic group containing at least three carbon atoms,
- B is one or more repeating units selected from the group consisting of MOxl, MOyR2m, and MOzR3R4n;
- wherein each M is Ti, Zn, Si, Sn, W, Ta, Zr, Hf, Al, Y, Fe, Ce or Cr,
- R2, R3 and R4 are each independently an alkyl group containing at least one carbon atom, an alkenyl group containing at least two carbon atoms, or a heterocyclic group containing at least three carbon atoms and at least one heteroatom selected from the group consisting of N, S, O and P,
- k is an integer from 1 to 20,
- l, m, and n are each independently an integer including 0 and at least one of l, m, or n is greater than 0, and
- x, y, and z are each independently an integer from 1 to 3.
Dependencies are inferred from the claim text.