Composite light-emitting material, production method thereof, and use thereof

1. A composite light-emitting material, wherein the composite light-emitting material comprises a perovskite nanomaterial and a matrix;

the perovskite nanomaterial comprises y-CsPbI3 and an addition element M; and

the addition element M is selected from at least one of Li, Na, K, and Rb,

wherein the perovskite nanomaterial is a core-shell structure;

a core is y-CsPbI 3 ; and

a surface comprises the addition element M.

2. The composite light-emitting material according to claim 1 , wherein;

the surface comprises at least one of MPbX3 and M4PbX6, and X is selected from at least one of halogens.

3. The composite light-emitting material according to claim 1 ;

wherein the surface is RbPbI3.

4. The composite light-emitting material according to claim 1 , wherein the composite light-emitting material has a light emission peak at 600-680 nm.

5. The composite light-emitting material according to claim 1 , wherein a molar ratio of y-CsPbI2 to the addition element M in the perovskite nanomaterial is 1:0.01-10.

6. The composite light-emitting material according to claim 1 , wherein a molar ratio of y-CsPbI3 to the addition element M in the perovskite nanomaterial is 1:0.5-2.

7. The composite light-emitting material according to claim 1 , wherein the matrix is a polymer, wherein the polymer is selected from at least one of polyvinylidene fluoride, a copolymer of polyvinylidene fluoride and trifluoroethylene, polyvinyl acetate, cellulose acetate, cyanocellulose, polysulfone, aromatic polyamide, polyimide, polycarbonate, polystyrene, and polymethyl methacrylate.

8. The composite light-emitting material according to claim 1 , wherein a mass ratio of the perovskite nanomaterial to the matrix is 1:1-100.

9. The composite light-emitting material according to claim 1 , wherein the composite light-emitting material further comprises an additive dispersed in the matrix; and

the additive is selected from at least one of zinc bromide, zinc iodide, stannous bromide, stannous iodide, cadmium bromide, and cadmium iodide.

10. The composite light-emitting material according to claim 9 , wherein a mass ratio of the matrix to the additive is 1:0.001-0.5.

11. The composite light-emitting material according to claim 1 , wherein the perovskite nanomaterial further comprises a surface ligand formed on a surface of y-CsPbI3; and

the surface ligand contains at least one of an organic acid, a halogenated organic acid, a C4-C24 organic amine, and a halogenated C4-C24 organic amine.

12. The composite light-emitting material according to claim 1 , wherein a mass ratio of y-CsPbI3 to a surface ligand is 1:0.001-1.

13. A production method for the composite light-emitting material according to claim 1 , characterized by comprising steps of:

(1) obtaining a precursor solution containing a matrix, a perovskite precursor, and an addition element M; and

(2) molding the precursor solution to obtain a modified perovskite nanomaterial.

14. The production method for the composite light-emitting material according to claim 13 , wherein the addition element M is derived from a compound containing the addition element M; and

the compound containing the addition element M is selected from at least one of LiCl, NaCl, KCl, RbCl, LiBr, NaBr, KBr, RbBr, LiI, NaI, KI, RbI, Li2CO3, Na2CO3, K2CO3, Rb2CO3, a Li metal-organic matter, a Na metal-organic matter, a K metal-organic matter, and a Rb metal-organic matter.

15. The production method for the composite light-emitting material according to claim 13 , wherein step (1) comprises:

(s11) obtaining a solution A containing the matrix;

(s12) obtaining a solution B containing Csl, PbI2, and the addition element M;

(s13) mixing the solution A and the solution B to obtain the precursor solution.

16. The production method for the composite light-emitting material according to claim 15 , wherein the solution A further comprises an additive, and the additive is selected from at least one of zinc bromide, zinc iodide, stannous bromide, stannous iodide, cadmium bromide, and cadmium iodide.

17. The production method for the composite light-emitting material according to claim 15 , wherein

the solution B further comprises a surface ligand;

the surface ligand contains at least one of an organic acid, a halogenated organic acid, a C4-C24 organic amine, and a halogenated C4-C24 organic amine; and

the surface ligand is added in step (s12).