Luminescence of F<sup>+</sup>‐type centers in undoped Lu<sub>3</sub>Al<sub>5</sub>O<sub>12</sub> single crystals
Vladimír BabinInstitute of Physics, University of Tartu, Riia 142, 51014 Tartu, EstoniaV. V. LagutaInstitute of Physics AS CR, Cukrovarnicka 10, 162 53 Prague, Czech RepublicA. MaaroosInstitute of Physics, University of Tartu, Riia 142, 51014 Tartu, EstoniaAlexander M. MakhovInstitute of Physics, University of Tartu, Riia 142, 51014 Tartu, EstoniaM. NiklInstitute of Physics AS CR, Cukrovarnicka 10, 162 53 Prague, Czech RepublicS. ZazubovichInstitute of Physics, University of Tartu, Riia 142, 51014 Tartu, Estonia
2010en
ABI
Аннотация
Abstract Undoped single crystals of Lu 3 Al 5 O 12 annealed in the reduced atmosphere or additively colored in Al vapors were studied at 4.2–400 K by the time‐resolved spectroscopy methods. The 3.15 eV emission, excited in the 3.4, 5.3, and 6.1 eV absorption bands and having a decay time of 3.14 ns at 10 K, was ascribed to the F + ‐type centers. It was suggested that these centers consist of an oxygen vacancy with one trapped electron which is perturbed by the neighboring antisite defect (Lu ) or an impurity ion at the Al 3+ site. The small Stokes shift and half‐width of the emission band indicate that the F + ‐type centers are characterized by a weak electron–phonon interaction.
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