Luminescence VUV spectroscopy of cerium-and europium-doped lithium borate crystals |
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Authors: | I. N. Ogorodnikov V. A. Pustovarov S. I. Omel’kov A. V. Tolmachev R. P. Yavetskiĭ |
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Affiliation: | (1) Ural State Technical University, Yekaterinburg, 620002, Russia;(2) Institute for Single Crystals, National Academy of Sciences of Ukraine, Kharkov, 61001, Ukraine |
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Abstract: | The paper reports on a study of the luminescence of lithium borate crystals (Li6Gd(BO3)3 doped by Eu3+ and Ce3+ ions, Li5.7Mg0.15Gd(BO3)3: Eu, and Li6Eu(BO3)3) initiated by selective excitation by synchrotron radiation at excitation energies of 3.7–27 eV at 10 and 290 K. Efficient energy transfer between the rare-earth ions Gd3+ → Ce3+ and Gd3+ → Eu3+ was found to proceed by the resonance mechanism, as well as by electron-hole recombination. Fast decay kinetics of luminescence of the Ce3+ activator centers was studied under intracenter photoexcitation and excitation in the interband transition region. The mechanisms involved in luminescence excitation and radiative relaxation of electronic states of rare-earth ions are analyzed, and the energy transfer processes operating in these crystals are discussed. |
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