Lanthanide double perovskite nanocrystals
AssigneeBrown University
InventorsOu Chen, Peter Saghy, Jerome R. Robinson
Life of this patent
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Abstract
Lanthanide double perovskite nanocrystals are described. The nanocrystals display high energy luminescence, making them useful in a variety of light-emitting materials and devices. Methods of preparing the lanthanide double perovskite nanocrystals using a hot injection method are also described.
Claims26
Double perovskite nanocrystals represented by the formula Cs2ABX6, wherein:
- A is an alkali metal;
- B is one or more lanthanide selected from the group consisting of La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, and Yb;
- and
- X is a halide selected from Br, Cl, or I.
A light emitting material comprising a material comprising double perovskite nanocrystals represented by the formula Cs2ABX6, wherein:
- A is an alkali metal;
- B is one or more lanthanide selected from the group consisting of La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, and Yb;
- and
- X is a halide selected from Br, Cl, or I.
A light emitting device comprising a light emitting material comprising double perovskite nanocrystals represented by the formula Cs2ABX6, wherein:
- A is an alkali metal;
- B is one or more lanthanide selected from the group consisting of La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, and Yb;
- and
- X is a halide selected from Br, Cl, or I.
A method of preparing double perovskite nanocrystals represented by the formula Cs2ABX6, wherein:
- A is an alkali metal;
- B is one or more lanthanide selected from the group consisting of La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, and Yb;
- and
- X is a halide selected from Br, Cl, or I;
- comprising the steps of:
- 1) adding cesium salt, an alkali metal salt, and a lanthanide salt or acetylacetonate to a mixture of a non-polar organic solvent, oleic acid, and oleylamine;
- 2) degassing the mixture for about 30 minutes to about 2 hours at a temperature ranging from about 60° C. to about 120° C. to remove oxygen and water;
- 3) injecting chloromethylsilane at a temperature from about 150° C. to about 200° C.;
- 4) rapidly cooling the mixture to about room temperature;
- and
- 5) collecting double perovskite nanocrystals from the mixture.
Dependencies are inferred from the claim text.