Method for synthesizing perovskite quantum dot film

1. A method for synthesizing a perovskite quantum dot film, comprising:

preparing a cellulose nanocrystal (CNC) solution, wherein the CNC solution comprises a plurality of CNCs with sulfate groups;

preparing a precursor solution;

mixing the CNC solution and the precursor solution to form a mixed solution; and

filtering and drying the mixed solution to form a perovskite quantum dot film, wherein the perovskite quantum dot film comprises a plurality of perovskite quantum dots uniformly distributed among the CNCs, and the perovskite quantum dots are represented by the following formula (1):

ABX 3   (1),

wherein A comprises an inorganic cation or an organic amine, the inorganic cation comprises Li, Na, K, Rb, Cs or a combination thereof, and the organic amine comprises ammonia, methylamine, formamidine acetate, formamidine amine, formamidine, ethylenediamine, dimethylamine, imidazole, acetamidine, propylamine, isopropyl amine, trimethylenediamine, ethylamine, butylamine, isobutylamine, tert-butyl amine, diethylamine, 5-aminovaleric acid, 2-thiophene methylamine, hexylamine, aniline, benzylamine, phenylethylamine, octylamine, decylamine, dodecylamine, tetradecylamine, hexadecylamine, octadecylamine, eicosamine or a hereof; B comprises Cd, Co Cr Cu Fe, Ge, Pb Sn or a combination thereof; and X comprises halogen.

2. The method for synthesizing the perovskite quantum dot film according to claim 1 , wherein preparing the CNC solution comprises:

dissolving CNC powder in water to form a first solution; and

dissolving the first solution in an organic solvent to form the CNC solution.

3. The method for synthesizing the perovskite quantum dot film according to claim 2 , wherein flexibility and a tensile property of the perovskite quantum dot film increase with an increase of a water content of the first solution.

4. The method for synthesizing the perovskite quantum dot film according to claim 1 , wherein the sulfate groups of the CNCs are connected with the perovskite quantum dots to improve stability of the perovskite quantum dot film.

5. The method for synthesizing the perovskite quantum dot film according to claim 1 , wherein preparing the precursor solution comprises:

providing a first precursor comprising A and X;

providing a second precursor comprising B and X; and

adding the first precursor and the second precursor into an organic solvent and uniformly mixing the first precursor, the second precursor and the organic solvent.

6. The method for synthesizing the perovskite quantum dot film according to claim 5 , wherein a wavelength of light emitted by the perovskite quantum dots increases with an increase of a concentration of the precursor solution.

7. The method for synthesizing the perovskite quantum dot film according to claim 1 , wherein each CNC has a length of 100 nm to 300 nm and a width of 3 nm to 20 nm.

8. The method for synthesizing the perovskite quantum dot film according to claim 1 , wherein a molecular weight of the CNC is 14700 to 27850.