Journal
PHYSICA STATUS SOLIDI B-BASIC SOLID STATE PHYSICS
Volume 248, Issue 1, Pages 239-242Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/pssb.201046245
Keywords
defects; lutetium-aluminum garnet; photoluminescence
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Funding
- Estonian [7507]
- Czech Science Foundations [202/08/0893]
- DESY [11-20052049 EC]
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Undoped single crystals of Lu3Al5O12 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 10K, 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 Al3+ 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. (C) 2010 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
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