Selective reading of stored information in RE doped aluminium perovskites
AbstractCerium doped rare earths aluminum perovskites, (REAlO3) are widely used as highly efficient and fast scintillators matrix for γ-ray detection. The crystal structures of pure perovskites (YAlO3 (YAP) and LuAlO3 (LuAP)) and their mixed compound (Lu0,7Y0,3AlO3 (LuYAP)) needs to be free of structural defects in order to avoid unwelcome shallow or deep intragap energy levels that decreases light yield and can generates afterglow that further reduce the efficiency of the final devices. However in this paper we focus on the possibility to control and use such carrier traps to engineer new devices for optical memory storage. In this perspective, the optical and structural characterizations are presented and the effects of visible irradiation on the thermoluminescence measurements are discussed. Three trap levels are observed in nitrogen atmosphere grown monocrystals of LuYAP sample, and the selective effects of red, blue and deep blue irradiation show the feasibility in the near future of new promising transparent displays.
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