Nanocrystals including III-V semiconductors
AssigneeMassachusetts Institute of Technology
InventorsMoungi G. Bawendi, Sang-wook Kim, John P. Zimmer
Life of this patent
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Abstract
Semiconductor nanocrystals including III-V semiconductors can include a core including III-V alloy. The nanocrystal can include an overcoating including a II-VI semiconductor.teh
Claims59
A water-soluble semiconductor nanocrystal comprising a core including a first semiconductor material, the first semiconductor material being a III-V alloy having the formula M1iM2JE1xE2y, wherein M1 and M2 are each independently a group III element;
- E1 and E2 are each independently a group V element;
- wherein (a) neither i nor j is zero, or (b) neither x nor y is zero;
- and the hydrodynamic diameter of the semiconductor nanocrystal is between 5 nm and 15 nm, and wherein the nanocrystal has an emission wavelength in a range of 700 to 1000 nm.
A water-soluble semiconductor nanocrystal comprising:
- a core including a first semiconductor material, the first semiconductor material being a III-V alloy having the formula M1iM2jE1xE2y, wherein M1 and M2 are each independently a group III element;
- E1 and E2 are each independently a group V element;
- and i, j, x and y are each independently a non-negative number, wherein (a) neither i nor j is zero, or (b) neither x nor y is zero;
- and the hydrodynamic diameter of the semiconductor nanocrystal is between 5 nm and 15 nm;
- a first overcoating including a second semiconductor material on a surface of the core;
- and
- a second overcoating including a third semiconductor material on a surface of the first overcoating, and wherein the nanocrystal has an emission wavelength in a range of 700 to 1000 nm.
A water-soluble semiconductor nanocrystal comprising:
- a core including a first semiconductor material;
- and
- an overcoating including a second semiconductor material on a surface of the core;
- wherein the second semiconductor material includes a II-VI alloy having the formula M1iM2jE1xE2y, wherein M1 and M2 are each independently a group II element;
- E1 and E2 are each independently a group VI element;
- and i, j, x and y are each independently a non-negative number, wherein (a) neither i nor j is zero, or (b) neither x nor y is zero;
- wherein the hydrodynamic diameter of the semiconductor nanocrystal is between 5 nm and 15 nm, and wherein the nanocrystal has an emission wavelength in a range of 700 to 1000 nm.
A water-soluble fluorescent particle comprising:
- a semiconductor nanocrystal including a III-V semiconductor material and a II-VI semiconductor, material wherein the III-V semiconductor material is an alloy having the formula M1iM2jE1xE2y, wherein M1 and M2 are each independently a group III element;
- E1 and E2 are each independently a group V element;
- and i, j, x and y are each independently a non-negative number, wherein (a) neither i nor j is zero, or (b) neither x nor y is zero;
- and
- a ligand on a surface of the semiconductor nanocrystal;
- wherein the particle has a hydrodynamic diameter not greater than 15 nm, and wherein the nanocrystal has an emission wavelength in a range of 700 to 1000 nm.
A water-soluble semiconductor nanocrystal comprising a core including a first semiconductor material having the formula M1E1xE21−x, wherein M1 is a group III element;
- E1 and E2 are each independently a group V element;
- and x is a non-negative number;
- and the hydrodynamic diameter of the semiconductor nanocrystal is between 5 nm and 15 nm, and wherein the nanocrystal has an emission wavelength in a range of 700 to 1000 nm.
A water-soluble semiconductor nanocrystal comprising:
- a core including a first semiconductor material, the first semiconductor material being a III-V alloy having the formula M1iM2JE1xE2y, wherein M1 and M2 are each independently a group III element;
- E1 and E2 are each independently a group V element;
- wherein (a) neither i nor j is zero, or (b) neither x nor y is zero;
- an overcoating on a surface of the core, the overcoating including a second semiconductor material, wherein the second semiconductor material includes a III-V semiconductor material;
- and
- a second overcoating on a surface of the core, the overcoating including a third semiconductor material, wherein the third semiconductor material includes a II-VI semiconductor material;
- and the hydrodynamic diameter of the semiconductor nanocrystal is between 10 nm and 15 nm.
A water-soluble semiconductor nanocrystal comprising a core including a first semiconductor material, the first semiconductor material being a III-V alloy having the formula M1iM2JE1xE2y, wherein M1 and M2 are each independently a group III element;
- E1 and E2 are each independently a group V element;
- wherein (a) neither i nor j is zero, or (b) neither x nor y is zero, and the emission wavelength of the nanocrystal is below 800 nm, and wherein the nanocrystal has a hydrodynamic diameter less than 15 nm.
Dependencies are inferred from the claim text.