A time-resolved luminescence spectroscopy study of non-linear optical crystals K2Al2B2O7 |
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| Authors: | IN Ogorodnikov VA Pustovarov SA Yakovlev LI Isaenko SA Zhurkov |
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| Institution: | 1. Experimental Physics Department, Ural Federal University, Mira Street, 19, Ekaterinburg 620002, Russia;2. Institute of Geology and Mineralogy, Siberian Branch of Russian Academy of Sciences, Russkaya Street, 43, Novosibirsk 630058, Russia |
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| Abstract: | We report the results of complex study of luminescence and dynamics of electronic excitations in K2Al2B2O7 (KABO) crystals obtained using low-temperature luminescence-optical vacuum ultraviolet spectroscopy with sub-nanosecond time resolution under selective photoexcitation with synchrotron radiation. The paper discusses the decay kinetics of photoluminescence (PL), the time-resolved PL emission spectra (1.2–6.2 eV), the time-resolved PL excitation spectra and the reflection spectra (3.7–21 eV) measured at 7 K. On the basis of the obtained results three absorption peaks at 4.7, 5.8 and 6.5 eV were detected and assigned to charge-transfer absorption from O2? to Fe3+ ions; the intrinsic PL band at 3.28 eV was revealed and attributed to radiative annihilation of self-trapped excitons, the defect luminescence bands at 2.68 and 3.54 eV were separated; the strong PL band at 1.72 eV was revealed and attributed to a radiative transition in Fe3+ ion. |
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