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摘要
A series of down-conversion Ba(2)dF(7): Eu3+/Dy3+ and up-conversion Ba(2)dF(7) : Yb3+/Ho3+ nanophosphors (NPs) were successfully prepared by a simple one-step hydrothermal method. The structure, morphology, composition, and properties of the multifunctional NPs were characterized by X-ray powder diffraction (XRD), field emission scanning electron microscopy (FESEM), energy dispersive spectrometry (EDS), Fouriertransform infrared (FTIR) spectroscopy, photoluminescence (PL) spectroscopy, and by a vibrating sample magnetometer (VSM). The NPs have a sphere-like morphology and cubic structure. Under ultraviolet excitation, individual Eu3+ and Dy3+ single-doped Ba(2)dF(7) phosphors exhibited excellent emission in their respective regions. The tunable color tone can be obtained in Eu3+ and Dy3+ co-doped Ba(2)dF(7) phosphors, and the strong yellow-white and bluish green-white emissions can be seen in Ba(2)dF(7): 0.05Eu(3+), yDy(3+) and Ba(2)dF(7:) 0.04Dy(3+), xEu(3+) phosphors, respectively. Under 980 nm NIR radiation, intense up-converted visible green emissions were observed in Ba(2)dF(7) : 0.2Yb(3+), 0.02Ho(3+) samples. The mechanism of UC emissions was determined to be two-photon absorption. In the Yb3+, Ho3+ co-doped Ba2GdF7 phosphors, the energy transfer processes from Yb3+ to Ho3+ have been discussed in detail. The enhanced up-conversion luminescence was realized by introducing the sensitizer Yb3+ ions to Ho(3+)co-doped Ba(2)dF(7) NPs and modifying the cetyltrimethylammonium bromide (CTAB) surfactant on Yb3+, Ho3+ co-doped Ba(2)dF(7) NPs. Moreover, the as-prepared samples exhibited paramagnetic properties at room temperature. This type of multifunctional nanophosphors have promising applications in light emitting diodes (LEDs), solid state lasers, biolabels, MRI, and so on.
- 出版日期2017-2-21
- 单位长春理工大学
