KCS

The conversion of near infrared (NIR) radiation into visible light via nonlinear optical processes, termed upconversion, has generated significant interest among researchers. Upconversion nanomaterials (UCNPs) exhibit unique luminescent properties, including high penetration into tissues, low background signals, shape emission bands.. The host material is one of the most factors for upconversion efficient. Various host materials such as fluorides, chlorides, bromides, and oxysulfides have been investigated for synthesize lanthanide-doped UCNPs. In case of YVO₄, most of previous reports have focused Yb³⁺ and/or Er³⁺, Eu³⁺-doped YVO₄. In this study, we have developed a simple, surfactant-free and efficient approach to synthesize the flexible excitation Er³⁺, Eu³⁺ and Yb³⁺-codoped YVO₄. The prepared Yb³⁺,Er³⁺,Eu³⁺-codoped YVO₄ were characterized by X-ray diffraction (XRD), Fourier-transform IR spectroscopy (FT-IR), scanning electron microscopy (SEM), and photoluminescence spectra. The results showed that the prepared YVO₄ exhibits uniform, nanoscale size, highly luminescent intensity, and flexible excited nanomaterial (excited by UV or IR irradiation). The mechanism is proposed. The characteristics of toxicity and labeling were investigated. Keywords: upconversion, excitation, labeling, lanthanide.