Influence of yttrium content on the CeLu1 and CeLu2 luminescence characteristics in (Lu1−xYx)2SiO5:Ce single crystals

This work deals with luminescence and scintillation characteristics of highly efficient cerium-doped scintillators, lutetium–yttrium orthosilicate (Lu2(1−x)Y2xSiO5:Ce3+, x = 0−1). The radioluminescence, photoluminescence excitation (PLE) and emission (PL) spectra of the CeLu1, CeLu2 centers in LSO, LYSO and YSO are measured and discussed between 80 and 400 K with respect to the CeLu1 and CeLu2 features assignment and separation. The influence of yttrium concentration in Lu2(1−x)Y2xSiO5:Ce3+ on CeLu1, CeLu2 luminescence characteristics is demonstrated. Temperature dependence shows that with increasing yttrium content the onset of the CeLu1 and CeLu2 decay time decrease and CeLu1, CeLu2 delayed recombination integrals increase shift to higher temperatures. The 5d1 thermally induced excited-state ionization of both CeLu1 and CeLu2 centers is confirmed and studied by purely optical methods.