Organic-quantum dot electroluminescent device mixed film and preparation method thereof

According to the organic-quantum dot electroluminescent device mixed film and the preparation method thereof provided by the invention, the Marangoni effect is utilized to prepare the film, that is, when a solution with low surface tension is dropped into a medium with high surface tension, local surface tension gradient can appear among materials, so that the surface of the solution flows to a relatively high surface tension, and the surface tension of the solution is reduced; two solvents with obvious differences in solubility, volatility and surface tension are utilized, and after the upper-layer solvent is volatilized, the organic-quantum dot mixed material can form a film on the lower-layer solvent and is not influenced by the lower-layer solvent. The preparation method and the thin film provided by the invention have the remarkable characteristics of excellent performance, large-area preparation, customization and material saving, greatly simplify the preparation of the mixed film layer of the organic-q