Nanofilms Of Densely Packed Gd₂O₃:0.05X³⁺（X=Eu, Tb） Nanorods Fabricated By An Oil-water Interfacial Self-assembly And Their Photoluminescence Properties

Recent years have witnessed the rapid development of electronic and Internet technology, which led us to the information age and greatly promoted the upgrading of display technology. Display technology has always been the most intuitive and important carrier of information. The manufacture of luminous film, which can achieve the function of mutual conversion of the electrical and optical signals, has always been the core technology of display device. A variety of chemical and physical strategies have been developed for film preparation, such as electron beam evaporation, magnetron sputtering, molecular beam epitaxy, chemical vapor deposition and so on. Nevertheless, these techniques usually demand sophisticated equipment and precise control of the process parameters, greatly increasing the manufacturing cost of the film. Consequently, it is essential to develop novel and desirable methods for film preparation.This paper presents a simple and effective oil-water interfacial self-assembly strategy to fabricate monolayer and bilayer nanofilms of densely packed Gd2O3:0.05X3+ (X= Eu, Tb) nanorods with characteristic luminescence properties. In this process, Gd2O3:0.05X3+(X= Eu, Tb) nanotubes synthesized by a hydrothermal method are dispersed in deionized water, then a certain amount of n-hexane is added to produce a hexane-water interface. With n-butanol added as initiator, the nanotubes are gradually trapped at the interface to form a densely packed nanofilm. An ideal cylinder model was used to explore the Assembly mechanism, showing that the assembly of the crystallites was driven by the decrease on interfacial energy after the placement of the crystallites at the hexane/water interface.A monolayer nanofilm of densely packed Gd2O3:0.05Eu3+nanorods is obtained after annealing. The nanofilm was highly continuous and uniform at the macroscopic scale. And it was more compact compared with nanofilms self-assembled with 2D nanostructures. The nanofilm exhibited characteristic luminescence properties. It was transparent to visible light while emitted red and green light, respectively, under ultraviolet irradiation. Moreover, the bilayer nanofilm maintained the luminescence properties of each monolayer nanofilms.