Study on preparation and optic properties of nano europium oxide–ethanol sol by pulsed laser ablation

Abstract

A novel method has been established for successive preparation of nano inorganic compound sols by pulsed laser ablation at the interface of solid and flow–liquid, and nano europium oxide–ethanol sol (NEO–ES) is obtained by this method firstly. The sol has been characterized by TEM, FT–IR, UV–VIS, fluorescence spectrum and XRD. The TEM result shows that europium oxide particles in NEO–ES have better dispersivity and their sizes are mostly below 5 nm. It is found that the vibration of ethanol molecule groups in the sol is obviously effected by nano europium oxide. The UV–VIS result shows that there are two strong absorption peaks at 244 nm and 284 nm vested in the characteristic peaks of Eu 2+ and its emission fluorescence spectrum is a broad peak with maximum value at 408 nm of Eu 2+. It is indicated that the Eu 3+ of Eu 2O 3 is reduced to Eu 2+ in the preparation course of the sol. The XRD shows that the nano europium oxide is mostly in non-crystalline form. The above results display that the characteristic of NEO–ES are closely concerned with the features of the method.