Controllable synthesis and down-conversion properties of flower-like NaY(MoO4 ) 2 microcrystals via polyvinylpyrrolidone-mediated

摘要: Double alkaline rare-earth molybdates NaY(MoO4)2 with multilayered flower-like architectures have been successfully synthesized via hydrothermal method in polyvinylpyrrolidone (PVP)-modified processes. The crystal structure and morphology of the obtained products were characterized by X-ray diffraction, scanning electron microscopy (SEM) transmission (TEM). It was found that reaction time amount PVP crucial influences on resulting novel microstructures. Under 450 nm excitation, Ho3+/Yb3+ co-doped samples exhibit 539 nm green emission 960–1200 nm broadband near-infrared emission, corresponding to characteristic lines Ho3+ Yb3+, respectively. Moreover, increasing Yb3+ doping enhances energy transfer efficiency from Yb3+.