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DF: Dielektrische Festkörper

DF 8: Spectroscopy, Scanning and Diffraction Methods

DF 8.4: Vortrag

Mittwoch, 29. März 2006, 15:50–16:10, M{\"U}L Elch

Luminescent oxygen-vacancy complex in Mn-doped LiBaF₃ investigated by optically detected magnetic resonance — •Bastian Henke¹, Uldis Rogulis², and Stefan Schweizer¹ — ¹Department of Physics, University of Paderborn, Warburger Str. 100, D-33098 Paderborn, Germany — ²Institute of Solid State Physics, University of Latvia, Riga, Latvia

Upon ultraviolet photoexcitation, Mn-doped LiBaF₃ shows different luminescence bands in the visible range. The luminescence, which can be attributed to Mn²⁺, is at 712 nm [1], whereas two additional bands appear at 423 and 480 nm. The peaks at 423 and 480 nm have completely different excitation spectra than the one for the 712 nm emission, which shows the typical Mn²⁺ excitation bands. Photoluminescence detected electron paramagnetic resonance measurements yielded that the bands at 423 and 480 nm can be attributed to an oxygen-vacancy complex. Its principal axis, z, of the fine structure tensor is aligned along a <110> direction. The Mn²⁺-dopant can be found in the vicinity of this complex. We assume that Mn²⁺ substitutes for a Ba²⁺ ion.

[1] B. Henke, M. Secu, U. Rogulis, S. Schweizer, J.-M. Spaeth, phys. stat. sol. (c) 2, No. 1 (2005), 380