Composite material film, manufacturing method thereof, and display panel

A manufacturing method of a composite material film, comprising:

• preparing a nanoparticle solution;
• preparing a porous material unit solution;
• adding a charged ligand to the porous material unit solution to charge a surface of a porous material unit in the porous material unit solution, wherein the charged ligand comprises an ionic surfactant, and an outer surface of the porous material unit is grafted with the ionic surfactant;
• mixing the porous material unit solution with the nanoparticle solution to cause nanoparticles in the nanoparticle solution to enter pores of the porous material unit to form a composite material solution;
• placing electrodes in the composite material solution;
• and
• applying electricity to the electrodes to cause the porous material unit loaded with the nanoparticles to deposit on one of the electrodes;
• wherein a size of the porous material unit ranges from 50 nm to 1000 nm, the pore size ranges from 2 nm to 50 nm, and the particle size of the nanoparticle or the size of the small organic molecule ranges from 2 nm to 50 nm.

A display panel, comprising:

• a substrate;
• a thin film transistor device layer disposed on the substrate;
• an anode layer disposed on the thin film transistor device layer;
• a light-emitting functional layer disposed on the anode layer;
• a cathode layer disposed on the light-emitting functional layer;
• and
• an encapsulation layer disposed on the cathode layer;
• wherein the light-emitting functional layer comprises a composite material film comprising:
• at least one film layer comprising porous material units, wherein a surface of each porous material unit has pores loaded with quantum dot nanoparticles;
• and
• wherein a pore size of each pore is larger than a particle size of each quantum dot nanoparticle, and an outer surface of the porous material unit is grafted with a ligand comprising an ionic surfactant;
• and
• wherein a size of the porous material unit ranges from 50 nm to 1000 nm, the pore size ranges from 2 nm to 50 nm, and the particle size of the nanoparticle or the size of the small organic molecule ranges from 2 nm to 50 nm.