Abstract: Decorated nano-ZnO ethanol sols which were modified in situ were successively produced by pulsed laser ablation at the interface of ZnO target submerged in the flowing liquid which contained modification agents. It is found that ZnO ethanol sol decorated by Hsal radiates intense blue light under ultraviolet radiation and has a broad emission band centered at 440 nm in the emission fluorescence spectrum. The emission intensity in 440 nm is as high as 1.12×10⁵. We studied some factors including different modification agents and their added methods, concentration of Hsal(salicylic acid), flowing liquid velocity, aging time after preparation which have effect on luminescence characteristics of sols. The results shows that the decorated nano-ZnO ethanol sol with best fluorescent characteristics can be obtained in following conditions: ethanol solution of Hsal as flowing liquid, concentration of Hsal is 4.2×10^-3 mol/L, flowing liquid velocity is 0.025 mL/s and proper aging time after preparation the ZnO ethanol sol. TEM results show that the diameter of nano-ZnO particles is about 15—30 nm. The study presents a convenient method to obtain the decorated nano-zinc oxide organic sol of high blue luminescence.

Key words: Pulsed laser, Decorated nano-ZnO, Sol, Fluorescence, Salicylic acid