▎ 摘　　要

NOVELTY - The composite material comprises nanometer zinc oxide and graphene. Graphene has 0.1-10 wt.% based on the 100 wt.% total weight of the composite material. USE - Composite material for thin film of quantum dot LED (all claimed). ADVANTAGE - Reduces possibility of exciton annihilation and improves luminous efficiency of device since transfer of electrons to valence band of quantum dots is avoided. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for a thin film preparation method. DESCRIPTION OF DRAWING(S) - The drawing shows the schematic diagram of a quantum dot LED. Anode (1) Injection layer (3) Quantum dot light-emitting layer (4) Electron transport layer (5) Cathode (6)