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Updated: Mar 3, 2026

Low-energy Cathodoluminescence for OxyNitride Phosphors
Published on: November 15, 2016
Dual-mode blue emission, enhanced up-conversion luminescence and paramagnetic properties of ytterbium and
Honglan Li1, Guixia Liu1, Jinxian Wang1
1Key Laboratory of Applied Chemistry and Nanotechnology at University of Jilin Province, Changchun University of Science and Technology, Changchun 130022, China.
Abstract:
A series of Ba2GdF7:Yb3+, Tm3+ 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, Yb3+ and Tm3+ 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 Yb3+ to Tm3+ were discussed in detail. The up-conversion luminescence of Ba2GdF7:Yb3+/Tm3+ nanophosphors were enhanced by introducing the sensitizer Yb3+ 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).
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