Abstract
It was shown, that Cu-doped hexagonal phases YGaO3, YInO3 and GdInO3 possess an intense broadband photoluminescence in the near infrared region. This photoluminescence is attributed to the unique crystalline lattice of studied hexagonal phases with trigonal-bipyramidal coordinated Ga3+ and In3+ ions. It was suggested that an emissive center in these phases is formed by heterovalent substitution of Ga3+ and In3+ for Cu2+. The energy level diagram of Cu2+ in trigonal-bipyramidal coordination offer some benefits for possible application of this impurity ion as an active center in broadband optical amplifiers and tunable lasers.
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