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Luminescence of F + ‐type centers in undoped Lu 3 Al 5 O 12 single crystals
Author(s) -
Babin V.,
Laguta V.V.,
Maaroos A.,
Makhov A.,
Nikl M.,
Zazubovich S.
Publication year - 2011
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.201046245
Subject(s) - luminescence , atomic physics , impurity , excited state , vacancy defect , ion , spectroscopy , electron , absorption spectroscopy , absorption (acoustics) , oxygen , analytical chemistry (journal) , materials science , crystallography , chemistry , physics , optics , optoelectronics , organic chemistry , quantum mechanics , chromatography , composite material
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 Al 3+ ) 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.