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Recombination processes in undoped and rare-earth doped MAl2O4 (M=Ca,Sr) persistent phosphors investigated by optically detected magnetic resonance

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4 Author(s)
Schweizer, Stefan ; Department of Physics, Faculty of Science, University of Paderborn, Warburger Str. 100, D-33098 Paderborn, Germany and Argonne National Laboratory, 9700 South Cass Avenue, Argonne, Illinois 60439 ; Henke, Bastian ; Rogulis, Uldis ; Yen, William M.

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The authors present magneto-optical measurements on single-crystal MAl2O4 (M=Ca and Sr) persistent phosphors that are nominally pure or doped with Eu and Nd or Dy, respectively. Their recombination luminescence (RL) and microwave-induced changes in the RL in a high magnetic field (RL-EPR) were investigated after ultraviolet excitation at low temperatures. Wavelength dependent RL-EPR measurements indicate that only one intrinsic donor but at least two different intrinsic acceptors are involved in the recombination process. The donor-acceptor recombination energy is either emitted directly (undoped samples) or almost completely transferred to the rare-earth activators (doped samples).

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Applied Physics Letters  (Volume:90 ,  Issue: 5 )