Abstract
GdAlO3−δ (δ=0.0, 0.1 and 0.2) compounds were prepared by the conventional solid-state method. XRD patterns revealed that all samples present a major orthorhombic structure. An intense red and a yellow photoluminescence (PL) emissions were observed at room temperature for δ=0.0 and δ≠0.0 samples, respectively. The red emission was related to the singly ionized oxygen vacancies VO. The production of doubly ionized oxygen vacancies VO lead to the appearance of a yellow color observed directly from δ=0.1 and 0.2 samples. The presence of singly and doubly ionized clusters was found to play an important role in the formation of hole–electron pairs and to give rise to the PL emission. The presence of singly ionized oxygen vacancies was confirmed by the EPR study.
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