Novel Synthetic Route for the Synthesis of Monodisperse β-NaYF4:Ln Micro-Nanocrystals from Layered Rare-Earth Hydroxides at ultra Low Temperature
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چکیده
منابع مشابه
NaYF4 nanocrystals with TOPO ligands: synthesis-dependent structural and luminescent properties.
A comprehensive characterization of NaYF4 nanocrystals synthesized in trioctylphosphine oxide has been reported in order to present an effective method of monodisperse, small, hexagonal nanocrystal synthesis in a high boiling organic solvent via a co-thermolysis pathway. We observed the influence of temperature, Na/Y precursors ratio and time of the synthesis on the nanocrystals size, shape and...
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Hexagonal phase (β) sodium rare earth tetrafluorides (NaREF4, RE = Y, Gd, Lu, et al.) are considered the ideal matrices for lanthanide (Ln) ions doped upconversion (UC) luminescence materials, because they can provide favorable crystal lattice structures for the doped luminescent Ln ions to make intensive emissions. However, the cubic phase (α) NaREF4 always preferentially forms at low reaction...
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Rare-earth ions doped luminescence upconversion nanoparticles have attracted much attention in recent years owing to their superior spectroscopic properties, mainly arising from the existence of stable intermediate states, which may result in potential applications in many fields, especially in biology/ biomedicine. Among these materials, hexagonal-phase NaYF4 is reported as one of the most eff...
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Monodisperse beta-NaYF4:Yb,Tm nanocrystals with controlled size (25-150 nm), shape (sphere, hexagonal prism, and hexagonal plate), and composition (Yb: 20-40%, Tm: 0.2-5%) were synthesized from the thermolysis of metal trifluoroacetates in hot surfactant solutions. The upconversion (UC) of near-infrared light (980 nm) to ultra-violet (360 nm), blue (450 and 475 nm), red (650 and 695 nm) and inf...
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Strong red upconversion luminescence of rare-earth ions doped in nanocrystals is desirable for the biological/biomedical applications. In this paper, we describe the great enhancement of red upconversion emission (4F9/2 --> I15/2 transition of Er3+ ion) in NaYF4:Yb3+, Er3+ nanocrystals at low doping level, which is ascribed to the effectiveness of the multiphonon relaxation process due to the e...
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تاریخ انتشار 2014