Improving the luminescence properties of YAG:Ce3+ phosphors by co-doping Sr2+ ions

To improve the luminescence properties of Ce-doped Y3Al5O12 (YAG:Ce3+), Sr ions are used as codopants. New defects created in the charge compensation could modify the symmetry of the crystal field around the Ce doping ion. The samples were produced by a modified sol-gel, using glucose as a polymerizing agent. X-ray diffraction measurements confirmed the presence of the single YAG phase. From Rietveld refinement, it was possible to observe that the unit cell expands with the increase of the Sr2+ concentration. The photoluminescence (PL) showed characteristic transitions of Ce3+ ions with greater emission intensity in the green region. The luminescence decay time showed that the concentration makes the emission more persistent.

Automated summary

Sr ions are used as codopants to improve the luminescence properties of Ce-doped YAG. The presence of single YAG phase was confirmed by X-ray diffraction measurements, and Rietveld refinement showed that the unit cell expands with the increase of Sr2+ concentration. Photoluminescence (PL) exhibited characteristic transitions of Ce3+ ions with greater emission intensity in the green region, and the luminescence decay time indicated that the concentration enhances emission persistence.