Preparation and optical properties of AgNWs/WO3:Eu3+ composite film

Nano-WO 3 :EU 3+ powder was prepared by Pechini method under acidic and alkaline condition, and the prepared acidic nano-WO 3 :Eu 3+ mixed with the silver nanowires (AgNWs) in ethanol and acetone solution. The solution was mixed with PMMA and EP, respectively. Then, drops of the solutions were added to the indium tin oxide (ITO) conductive glass as the substrate; a AgNWs/WO 3 :Eu 3+ composite film was obtained with spin coating by spin coater and solidification process. Microstructure, morphology, optical properties, preparation process and UV transmittance of the prepared nano-WO 3 :Eu 3+ and AgNWs/WO 3 :Eu 3+ composite films were investigated by XRD, SEM, fluorescence spectroscopy and UV spectrophotometer. The results show that the prepared acidic nano-WO 3 is triclinic, and the average particle size is 71.63 nm. The prepared alkaline nano-WO 3 is monoclinic, with an average particle size of 95.66 nm. Both of them have good luminescence properties. Under different monitoring wavelengths, in the emission range of 450–500 nm, it belongs to the green light region, and its excitation peak is the largest, indicating that green light is the best excitation light source for WO 3 :Eu 3+ powder. The transmittance of EP/AgNWs/WO 3 :Eu 3+ composite film is the highest when the spin coating time is more than 30 s and above 3000 rpm, no more than three layers spin coating and the content of curing agent is between 0.1 and 0.2 g.