Publication date: 10th April 2014
Nanomaterials based on BaREF5 fluorides (where RE = Y, Gd and Lu), doped with lanthanide ions Yb3+/Ln3+ (Ln = Er, Ho or Tm) where synthesized by microwave assisted hydrothermal method. The way of synthesis, structural and morphologic properties will be reported and discussed. The morphology of BaREF5 nanomaterials varied from spharical nanocrystals with average size around 45 nm to ring-like structures with a diameter around 210 nm. Obtained products showed visible up-conversion luminescence excited by the laser light with wavelength around 978 nm as the consequence of energy transfer between Yb3+ and Ln3+ ions. Their spectroscopic properties were characterized on the basics of excitation and emission spectra. Also recorded luminescence decays and emission power dependencies will be presented. Compared materials showed differences in their structural properties what reflected also spectroscopic characteristics. The most intense luminescence was registered for BaLuF5 based materials. In this host compound, the emissions from Er3+ and Tm3+ ions were especially efficient showing also transitions from higher excited states, requiring more than two photons to be populated.
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