Preparation And Energy Transfer Properties Of Gd-based Rare Earth Fluorescent Nanomaterials

Gd-based rare earth fluorescent nanomaterials have attracted much attention in the fields of photoelectronic devices and biomedical science ascribed to their unique optical and magnetic characteristics, in order to meet the requirements of multicolor emission photoelectronic devices and biomedical science fields on novel magneto-optical multifunctional nanomaterials, we have prepared several kinds of Gd-based rare earth fluorescent nanomaterials and studied their optical and energy transfer properties in detail.The main research works are as follows.Gd(OH)CO3: Dy3+, Eu3+microspheres were obtained by hydrothermal method and Gd2O3: Dy3+, Eu3+ submicrospheres with muliticolor emissions and paramagnetic properties were gained through high temperature calcination. The research results show that there are energy transfer processes from Gd3+ ions to Dy3+, Eu3+ ions and from Dy3+ ions to Eu3+ ions in Gd2O3: Dy3+, Eu3+ system, the samples exhibit multicolor emissions by changing the concentration of Dy3+ and Eu3+ ions and the emission color could be tuned from cool white light to warm white light through adjusting different excitation wavelengths.GdVO4: Sm3+, Eu3+ nanomaterials with orange emission and paramagnetic properties were prepared by hydrothermal method. The research results show that VO43- group could effectively absorb ultraviolet(UV) light and transfer energy to Sm3+ and Eu3+ ions, Sm3+ ions transfer energy to Eu3+ions, the emission color both moves reddish-orange side thorugh changing the concentration of Sm3+ or Eu3+ ions.GdVO4: Dy3+, Eu3+ nanomaterials with multicolor emissions and magnetic properties were prepared by hydrothermal method. The research results show that VO43- group transfer energy to Dy3+and Eu3+ions, the samples could exhibit multicolor emissions by changing the content of Dy3+ and Eu3+ ions or adjusting different excitation wavelengths, the magnetic properties of the as-prepared mulitifunctional nanomaterials have also been systematically studied.NaGdF4: Dy3+, Tb3+green emission nanomaterials were synthesized by hydrothermal method. The research results show that Gd3+ ions can effectively absorb UV light and transfer energy to Dy3+ and Tb3+ ions, and Dy3+ ions could comparatively effectively absorb near ultraviolet(n-UV) light and transfer energy to Tb3+ ions, which increases green emission from Tb3+ions.