Energy transfer in rare earth-doped CaWO4 after red edge excitation |
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Authors: | Robert G. Peterson Richard C. Powell |
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Affiliation: | Department of Physics, Oklahoma State University, Stillwater, Oklahoma 74074, USA |
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Abstract: | Host sensitized energy transfer in CaWO4 doped with Eu3+ and Sm3+ is investigated using pulsed laser time-resolved spectroscopy techniques. The excitation is into the long wavelength tail of the absorption edge and the results indicate that this selectively excites tungstate ions which are located next to activator impurity ions. The subsequent energy transfer is found to be consistent with a single step, nearest neighbor process. Both electric dipole-dipole and exchange interactions can predict strong enough transfer to account for the observed rates. These results are compared to those obtained previously for broad band excitation into the highest energy absorption bands of CaWO4 crystals. |
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