Abstract
Ca0. 8La0. 2- x-yMoO4∶ xTb3+,yEu3+fluorescent materials were prepared by hydrothermal method. The crystal structure and luminescence properties were studied. X-ray diffraction( XRD)patterns confirm that the crystal structure of the samples matches well with the tetragonal CaMoO4.The introduction of rare earth ions La3+,Eu3+,and Tb3+doesn't change the structure of the host lattice. Comparing with CaMoO4∶ Eu3+phosphors,the characteristic emission peak in 616 nm(5D0→7F2) of Ca0. 8La0. 15MoO4∶0. 05Eu3+is enhanced obviously. The emission spectra of Ca0. 8La0. 16- yMoO4∶ 0. 04Tb3+,yEu3+( y =0. 01,0. 03,0. 05,0. 07) exhibit two emission peaks at545 nm and 616 nm under 285 nm UV excitation,corresponding to the transition of5D4→7F5of Tb3+ and 5D0→7F2of Eu3+. It is found that the emission intensity of Eu3+increases and the emission intensity of Tb3+decreases with the increasing of Eu3+content,indicating that there is energy transfer of Tb3+→Eu3+. Moreover,the luminescence colors of the Ca0. 8La0. 16- yMoO4∶ 0. 04Tb3+,yEu3+( y =0. 01,0.03,0.05,0.07) samples can be tuned from green,green-yellow and yellow to red by simply adjusting the relative doping concentrations of the activator ion of Eu3 +under a single wavelength excitation.
Published Version
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