Modified zinc oxide nanoparticles, method for modifying thereof, and quantum dot light-emitting diode

A quantum dot light-emitting diode, comprising an anode;

• a cathode arranged oppositely to the anode;
• a quantum dot light-emitting layer arranged between the anode and the cathode;
• and
• an electron transportation layer is arranged between the quantum dot light-emitting layer and the cathode;
• wherein the electron transportation layer is a film formed from surface modified zinc oxide nanoparticles comprising betaine ligands grafted to the surfaces of zinc oxide nanoparticles;
• wherein the betaine ligands are at least one selected from the group consisting of N-dodecyl-N,N-dimethylglycine, tetradecyl dimethyl betaine, hexadecyl dimethyl betaine, octadecyl dimethyl betaine, cocamidopropyl betaine, and sodium lauroamphoacetate;
• wherein a mass ratio of the betaine ligands to the zinc oxide nanoparticles is (0.1-1):1;
• and
• wherein the betaine ligands prevent agglomeration between particles, while improving recombination efficiency of electrons and holes in the quantum dot light-emitting layer by hindering the electron transmission rate to a certain extent.