▎ 摘　　要

NOVELTY - Preparation of quantum-dot LED device involves providing a substrate comprising first electrode, cold treating the substrate or placing the substrate at a first temperature condition, depositing a quantum dot solution on the substrate to form a quantum dot film layer, and preparing a second electrode on the quantum dot film layer. The absolute difference between first temperature, storage temperature and the cold treatment temperature of the quantum dot solution is 0-5℃. USE - Preparation of quantum-dot LED device (claimed). ADVANTAGE - The method can avoid the problem of uneven light emission of the quantum dot-LED device caused by falling of ligands of quantum dot material to the maximum extent, and can reduce the phenomenon of fluorescence quenching.