Abstract
EuAlO3 ternary compound and Al2O3−Eu2O3 compositions are synthesized by metal-organic decomposition method and their structural and luminescence properties are investigated using X-ray diffraction analysis, photoluminescence (PL) analysis, PL excitation (PLE) spectroscopy, and luminescence lifetime measurements. The effects of calcination temperature on the structural and Eu3+ emission properties are studied in detail. Temperature dependence of the PL intensity at T = 20–450 K exhibits clear thermal quenching behavior, yielding quenching energies of 14 meV and 0.22 eV at low and high temperature regions, respectively. The stable phase of orthorhombic EuAlO3 is formed at activation energy of ∼0.8 eV. The schematic energy-level diagram for Eu3+ in EuAlO3 is also proposed for the sake of a better understanding of the PL and PLE processes in this host material. The luminescence decay characteristics indicate that the decay times are given by the concentration quenching-limited values in the Eu2O3-rich materials. The measured Eu3+-emission decay times are τav ∼ 20 μs in the (1 − x)Al2O3 : xEu2O3 compounds with x = 0.5 (EuAlO3) and 1.0 (Eu2O3). These values are much smaller than τav ∼ 500 μs in Al2O3:Eu3+ (x = 0.05).
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