Abstract: A series of rare earth complex oxides, i.e. (Y1-xGdx)3Al5O12 : Ce3＋, (Y1-xLux)3Al5O12:Ce3＋, (Y1-xLax)3Al5O12:Ce3＋, (Y1-xYbx)3Al5O12:Ce3＋and (Y1-xTbx)3Al5O12:Ce3＋, have been prepared, and their luminescent properties were studied. Particular attention was paid to (Y1-xGdx)3Al5O12:Ce3＋ and (Y1-xLux)3Al5O12:Ce3＋systems because of their promising luminescent properties. X-ray powder diffraction patterns show that both systems have garnet structure, and the lattice constants vary smoothly with the compositions. The emission spectra of Ce3＋ in both systems are a broad band located at about 540 nm. The emission transition shows a red shift in (Y1-xGdx)3Al5O12:Ce3＋ system, and a blue shift also observed in (Y1-xLux)3Al5O12:Ce3＋system. This phenomenon could be interpreted with the configuration coordination model. The shift of the emission spectra in these systems provides the new option to improve the performance of white LED device.

Key words: Gallium nitride LED(light emitting dicde), Blue light conversion materials, Rare earth garnet, Luminescence, Blue shift, Red shift, 　Configuration coordination