Study on the enhancement mechanism of luminescent performance of Ag structures on the surface of nano-giant topological luminophor

Y₂O₃:Eu³⁺+Octadecylamine(ODA)+Dodecylamine(DDA)+Ag giant topological luminophor with a gradient porous structure provides a new thought and approach to greatly improve the luminescent performance of rare-earth-doped nanocomposites phosphors. However, the enhancement mechanism of Ag topological structure, during process of synergistic enhancement, has not been clearly demonstrated and verified by simulation. Based on the quantum size effect of nanomaterials, a nano-giant topological luminophor Y₂O₃:Eu³⁺+ODA+DDA+Ag was synthesized by solvothermal method in this paper. The experimental results show that the luminescence intensity of Y₂O₃:Eu³⁺+ODA+DDA+Ag is increased by a substantial improvement of about 700% than that of nano Y₂O₃:Eu³⁺ luminophor under the same test conditions, in the synergy mechanism of Ag topological structures and the gradient porous which composed of differently sized pores, with Ag structures accounting for about 45% of the enhancement. On the basis of density functional calculations, the absorption of representative Ag nanoparticles (NPs) in the visible light region(200–900 nm) and its influence on the local electric field around NPs were calculated in this paper. The finite difference time domain simulation results suggested that the surface plasmon resonance of the Ag NPs sharply enhanced the radiative transition of samples. Photoluminescence and electroluminescence experimental results verified the enhancement mechanism of Y₂O₃:Eu³⁺+ODA+DDA+Ag and the existing form of the Ag NPs. The recombination luminescence induced by the Ag topological structures composed of Ag NPs on the surface of the sample is a crucial part in enhancing the luminescent performance.