LPE growth and study of the Ce3+ incorporation in LuAlO3:Ce single crystalline film scintillators

This work reports the results of the optical and electron paramagnetic resonance (EPR) investigation of the Ce3+ incorporation in single crystalline film (SCF) scintillators of Ce-doped LuAlO3 perovskite, grown by the liquid phase epitaxy method onto YAlO3 substrates using a PbO-B2O3 flux. The absorption, luminescence and EPR spectra showed the presence of the main Ce3+ center type (CeLu) corresponding to the location of Ce3+ ions in the twelve-fold coordinated cuboctahedral positions of the LuAlO3 host. Also the dimer Ce-Lu-Ce-Lu centers were found in the EPR spectra of the LuAP: Ce SCFs. No EPR spectrum of the Ce3+ ions located in the octahedral positions of Al3+ cations has been detected indicating their negligibly small concentration (below 5 x 10(-3) at%) in the SCFs. Pb3+ and Pt3+ impurity ions incorporated into the SCFs grown from the PbO-B2O3 flux and Pt crucible were also identified by resolving, in particular, the hyperfine structure from the Pt-195 isotope in the EPR spectra.