Dual-mode blue emission, enhanced up-conversion luminescence and paramagnetic properties of ytterbium and thulium-doped Ba2GdF7 multifunctional nanophosphors.

Author(s) Li, H.; Liu, G.; Wang, J.; Dong, X.; Yu, W.
Journal J Colloid Interface Sci
Date Published 2017 Sep 01

A series of Ba2GdF7:Yb(3+), Tm(3+) nanophosphors (NPs) with dual-mode (down-conversion (DC) and upconversion (UC)) luminescence were successfully prepared by hydrothermal method at 180°C. The NPs have sphere-like morphology and cubic structure. Under the excitation of ultraviolet 355nm and near-infrared 980nm, Yb(3+) and Tm(3+) ions co-doped Ba2GdF7 phosphors exhibit bright blue dual-mode emission. The mechanism of UC emissions was determined three-photon absorption. The energy transfer processes from Yb(3+) to Tm(3+) were discussed in detail. The up-conversion luminescence of Ba2GdF7:Yb(3+)/Tm(3+) nanophosphors were enhanced by introducing the sensitizer Yb(3+) ions and modifying the cetyltrimethylammonium bromide (CTAB) surfactant, respectively. Moreover, the as-prepared samples exhibit paramagnetic properties at room temperature. This type of multifunctional nanophosphors have promising applications in anti-counterfeiting, drug delivery, solid state lasers, biolabels, MRI, light emitting diodes (LEDs).

DOI 10.1016/j.jcis.2017.04.066
ISSN 1095-7103
Citation J Colloid Interface Sci. 2017;501:215221.

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