Visible and near-infrared upconversion photoluminescence in lanthanide-doped KLu3F10 nanoparticles
Abstract
Upconversion (UC) photoluminescent nanocrystals of Ln3+-doped KLu3F10 have been synthesized via a facile and environmentally-friendly hydrothermal route. X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), transmission electron microscopy (TEM), high-resolution transmission electron microscopy (HRTEM) and photoluminescence (PL) spectroscopy were employed to characterize the samples. Visible and near-infrared (NIR) UC photoluminescence emissions were achieved with KLu3F10 samples co-doped with Yb3+/Er3+, Yb3+/Ho3+ and Yb3+/Tm3+. More importantly, the emission intensity could be greatly enhanced by introducing CTAB as a surfactant, while it drastically decreased with the addition of OA. Meanwhile, it was found that the tunable color of the UC photoluminescence could be realized by introducing CTAB and OA. The achievement of red and NIR UC photoluminescence indicates that the Ln3+-doped KLu3F10 nanocrystals could provide potential applications in in vivo and in vitro optical bioimaging.
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