The doping effects of La3+, Gd3+ and Lu3+ on the crystal structure and luminescence properties of (Y0.96-xLnxCe0.04)3Al5O12 (Ln=Gd, La, Lu) phosphors were studied.The X-ray diffraction patterns presented that with the increase of the doping concentrations of La3+ and Gd3+ ions, the d-value of (Y0.96-xLnxCe0.04)3Al5O12 (Ln=Gd, La) increased and the larger the doping ion, the stronger the effect would be.The doping amount causing phase transition in (Y0.96-xLnxCe0.04)3Al5O12 decreased with the increase of the ionic radii of the doping lanthanide ions (La3+: 0.106 nm, Gd3+: 0.094 nm, Lu3+: 0.083 nm).The bigger doping ion of Gd3+ made the emission of (Y0.96-xGdxCe0.04)3Al5O12 move to red spectral region, but the smaller one of Lu3+ made it blue.
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