Time-resolved luminescence and excitation spectroscopy of Co-doped GdGaAlO scintillating crystals.

Cerium doped GdGaAlO (GGAG) single crystals as well as GGAG:Ce single crystals co-doped by divalent (Mg, Ca) and tetravalent (Zr, Ti) ions have been studied by means of time-resolved luminescence as well as the excitation luminescence spectroscopy in vacuum ultraviolet (VUV) and soft X-ray (XUV) spectral range. Tunable laser excitation was applied for time-resolved experiments in order to obtain luminescence decay curves under excitations in Ce, Gd and excitonic absorption bands. The influence of the co-dopant ions on the Ce luminescence decay kinetics is elucidated.