论文摘要
Monodisperse water-soluble LaF3:Ln3+ nanocrystals (NCs) have been successfully fabricated viaa fast, facile and environmentally-friendly microwave-assisted modified polyol process with polyvinylpyrrolidone (PVP) as an amphiphilic surfactant. The obtained NCs can be well dispersed in hydrophilic solutions with small sizes in the range of 9–12 nm. The LaF3:Ln3+ NCs (Ln = Eu, Nd, Ce, Tb, Yb, Er, Yb, Ho and Yb, Tm) have the unique feature of up–down conversion from visible to NIR emission owing to the ladder-like arranged energy levels of Ln3+ and in particular, the high efficiency upconversion of the two-photon, obtained from excitation by a continuous 980 nm laser. This investigation focuses on both the up and down conversion fluorescence properties of water-soluble monodisperse crystalline LaF3:Ln3+ NCs in such a small size. Furthermore, the three-dimensional PDMS rod-like fluorescence displays and a silica surface modification by a core/shell structure on the obtained NCs can improve the biocompatibility, indicating potential applications in optical 3D devices and as bio-probes.
论文题目
Microwave-assisted synthesis and up–down conversion luminescent properties of multicolor hydrophilic LaF3: Ln3+ nanocrystals
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