Quantum dots modified by macromolecular monomer, preparation method for quantum dots and application of quantum dots

Abstract

The invention discloses quantum dots modified by a macromolecular monomer. According to the quantum dots, the macromolecular monomer which is prepared through catalytic chain transfer polymerization is taken as a ligand; and the quantum dots have the characteristics of narrower fluorescence emission spectrum, high luminous efficiency and high stability. Particle sizes of the quantum dots modified by the macromolecular monomer are 2 to 20nm, the quantum dots are water-soluble, the quantum yield is 20 to 95 percent, the half-peak width of a photoluminescence spectrum is 20 to 80nm, and the fluorescent quantum dots are one of ZnxCd1-xS, ZnxCd1-xTe and ZnxCd1-xSe, wherein x is more than or equal to 0 and less than or equal to 1; and the macromolecular monomer used as the ligand is one of polymethylacrylic acid, polyacrylic acid, poly(hydroxyethyl methacrylate), poly(2-Hydroxypropyl methacrylate) or a polymethylacrylic acid-b-poly(butyl acrylate) block copolymer, and the molar ratio of the macromolecular monomer to metal ions is (0.5:1)-(5:1).