NOVELTY - Zinc oxide (ZnO)-copper oxide (CuO) core-shell quantum dot/nanocrystalline structure, which is quasi-zero dimensional composite structure, comprises ZnO as coated core and CuO shell.    USE - ZnO-CuO core-shell quantum dot/nanocrystalline structure used for solar energy battery, photocatalysis, UV functional material and other optoelectronic fields.    ADVANTAGE - The ZnO-CuO core-shell quantum dot/nanocrystalline structure has good visible light absorption and absorption peak near UV. The preparation of ZnO-CuO core-shell quantum dot/nanocrystalline structure has strong controllability, greatly simplified operation and low cost, provides uniform and stable product, and is suitable for mass production.    DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for preparation of ZnO-CuO core-shell quantum dot/nanocrystalline structure comprising conducting sol-gel method to prepare ZnO core by selecting zinc acetate dihydrate and sodium hydroxide at 0.176 g:0.96 g, mixing zinc acetate dihydrate and anhydrous ethanol by stirring to fully dissolve under 60 degrees C water bath, obtaining 0.08 mol/L zinc acetate ethanol solution, fully dissolving sodium hydroxide in anhydrous ethanol by stirring at room temperature, obtaining 0.5 mol/L sodium hydroxide ethanol solution, mixing zinc acetate ethanol solution and sodium hydroxide ethanol solution at room temperature at 600 revolutions/minute (rpm) for 12 hours, obtaining ZnO quantum dot/nanocrystalline sol, coating ZnO core with CuO shell by taking copper acetate at zinc acetate dihydrate and copper acetate ratio of 0.176 g:0.040 g, fully dissolving copper acetate in anhydrous ethanol by stirring at 60 degrees C, obtaining 0.08 mol/L copper acetate ethanol solution, mixing ZnO quantum dot/nanocrystalline sol with copper acetate ethanol solution by stirring at 600 rpm under 60 degrees C water bath, after reaction is completed, centrifugally separating, washing the precipitates with deionized water to remove impurity ions, centrifugally separating again, repeating the centrifugal separation and washing for 3 times, drying the precipitates at 60 degrees C, and obtaining the product.