Abstract
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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