Colloidal nanocrystals with high photoluminescence quantum yields and methods of preparing the same
AssigneeBoard of Trustees of the University of Arkansas
InventorsXiaogang Peng, Lianhua Qu
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Abstract
The present invention provides new compositions containing colloidal nanocrystals with high photoluminescence quantum yields, new synthetic methods for the preparation of highly luminescent colloidal nanocrystals, as well as methods to control the photoluminescent properties of colloidal nanocrystals. The new synthetic methods disclosed herein allow photoemission brightness (quantum yield) to be correlated with certain adjustable nanocrystal growth parameters associated with a given synthetic scheme.
Claims24
A composition comprising colloidal nanocrystals, prepared by the method comprising:
- a) combining a cation precursor, a first ligand, and a first solvent to form a cation-ligand complex;
- b) admixing an anion precursor with the cation-ligand complex at a first temperature sufficient to induce reaction therebetween, wherein the initial concentration of the anion precursor is about 10 times the initial concentration of the cation precursor in the mixture;
- and
- c) adjusting the temperature of the mixture to a second temperature sufficient to form nanocrystals of the reaction product;
- wherein the nanocrystals do not comprise tellurides.
A method of synthesizing colloidal nanocrystals with an improved photoluminescence quantum yield, comprising:
- a) combining a cation precursor, a first ligand, and a first solvent to form a cation-ligand complex;
- b) admixing an anion precursor with the cation-ligand complex at a first temperature sufficient to induce reaction therebetween, wherein the initial concentration of the anion precursor is about 10 times the initial concentration of the cation precursor in the mixture;
- and
- c) adjusting the temperature of the mixture to a second temperature sufficient to form nanocrystals of the reaction product.
A method of synthesizing colloidal nanocrystals with an improved photoluminescence quantum yield, comprising:
- a) combining a cation precursor, a first ligand, and a first solvent to form a cation-ligand complex;
- b) admixing an anion precursor with the cation-ligand complex at a first temperature sufficient to induce reaction therebetween wherein the concentration of the anion precursor is about 20 times the concentration of the cation precursor in the mixture;
- and
- c) adjusting the temperature of the mixture to a second temperature sufficient to form nanocrystals of the reaction product.
Dependencies are inferred from the claim text.