Relationship between crystal structure and luminescence properties of (Y0.96-xLnxCe0.04)3 Al5O12 (Ln = Gd, La, Lu) phosphors

The doping effects of La3+, Gd3+ and Lu3+ on the crystal structure and luminescence properties of (Y-0.96 - (x) Ln(x) Ce-0.04)(3) Al-5 O-12 (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 (Y-0.96 - (x) Ln(x) Ce-0.04)(3) Al-5 O-12 (Ln = Gd, La, Lu) increased and the larger the doping ion, the stronger the effect would be. The doping amount causing phase transition in (Y-0.96 - (x) Ln(x) Ce-0.04)(3) Al-5 O-12 decreased with the increase of the ionic radii of the (loping lanthanide ions (La3+: 0. 106 nm, Gd3+: 0. 094 nm, Lu3+: 0.083 nm). The bigger doping ion of Gd3+ made the emission of (Y-0.96 - (x) Ln(x) Ce-0.04)(3) Al-5 O-12 move to red spectral region, but the smaller one of Lu3+ made it blue.