Luminescent composite material and preparation method therefor
AssigneeShanghai Jiao Tong University
InventorsLiang LI, Bo WANG
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Abstract
A luminescent composite material and a preparation method therefor. The luminescent composite material is prepared by mixing a precursor of a quantum dot and an oxide or a precursor thereof followed by high-temperature calcination. Compared with traditional methods, the method provided herein is a simple and low-cost synthesis process without using solvents, and is suitable for large-scale production. The luminescent composite material has high quantum efficiency, luminous intensity and luminous color purity and good photothermal stability, which can provide basis for theoretical research and applications of the luminescent composite material in high-performance photoluminescence devices, lasers and nonlinear optical devices.
Claims16
A luminescent composite material, comprising:
- a quantum dot;
- and
- an oxide;
- wherein the oxide is a carrier of the quantum dot;
- the quantum dot is distributed on a surface of the oxide;
- and a molar ratio of the quantum dot to the oxide is 1:1-100.
The method of claim 7, wherein the method further comprises:
- (4) annealing the grinded mixture obtained in step (3) in air at 400-600° C. for 5-60 min to obtain the annealed luminescent composite material.
The method of claim 7, wherein before step (1), the oxide or precursor thereof is calcined in a nitrogen atmosphere at 500-1000° C. for 5-60 min;
- and in step (2), a reducing atmosphere is further used for calcination.
The method of claim 7, wherein before step (1), the oxide or precursor thereof is calcined in a nitrogen atmosphere at 500-1000° C. for 5-60 min, and the calcined oxide or precursor thereof is annealed in air at 400-600° C. for 5-60 min;
- and
- in step (2), a reducing atmosphere is further used for calcination.
The method of claim 7, wherein the at least one precursor of the quantum dot comprises an AX precursor and a BX2 precursor;
- wherein A is selected from the group consisting of Li, Na, K, Rh, Cs, Ca, Sr and Ba, and B is selected from the group consisting of Al, Ga, In, Ge, Sn, Ph, Cu, Mn, Sb and Bi;
- X is selected form the group consisting of F, Cl, Br and I;
- and a molar ratio of the AX precursor to the BX2 precursor is 1:1.
The method of claim 7, wherein the at least one precursor of the quantum dot comprises a cation precursor and an anion precursor;
- a molar ratio of the cation precursor to the anion precursor is 1:1;
- the cation precursor provides a cation Dn+ for the quantum dot, wherein n is an integer of 1-10;
- the cation precursor is an oxide, a nitride, a phosphide, a sulfide, a selenide, a hydrochloride, an acetate, a carbonate, a. sulfate, a phosphate, a nitrate or a hydrate of an element selected from the group consisting of Zn, Cd, Hg, Al, Ga and In;
- and
- the anion precursor provides an anion Yn− for the quantum dot, wherein n is an integer of 1-10;
- and the anion precursor is a simple substance or an inorganic salt of an element selected from the group consisting of S, Se, Te, N, P, As and Sb.
The method of claim 7, wherein the at least one precursor of the quantum dot comprises a first precursor, a second precursor and a third precursor;
- wherein the first precursor provides a monovalent cation for the quantum dot, and is selected from the group consisting of CuCl, CuBr, CuI, AgCl, AgBr, AgI, Cu2S, Cu2Se, Ag2S, Ag2Se, Cu2Te, Ag2Te and combinations thereof;
- the second precursor provides a trivalent cation for the quantum dot, and is an oxide, a sulfide, a selenide, a formate, an acetate, a propionate, a carbonate, a sulfate, a nitrate or a phosphate of a metal selected from the group consisting of In, Ga and Al;
- the third precursor provides a divalent anion for the quantum dot, and is a simple substance or an inorganic salt of an element selected from the group consisting of S. Se and Te;
- and
- a molar ratio of the first precursor to the second precursor to the third precursor is 0.5:
- 0.51.
The method of claim 7, wherein the oxide or precursor thereof is selected from the group consisting of an oxygen-containing aluminum compound, an oxygen-containing silicon compound, an oxygen-containing zirconium compound, an oxygen-containing titanium compound, an oxygen-containing tin compound, an oxygen-containing zinc compound, an oxygen-containing molybdenum compound, an oxygen-containing lanthanum compound, an oxygen-containing cerium compound and an oxygen-containing samarium compound.
Dependencies are inferred from the claim text.