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Electronic excitations and luminescence in CsLiB6O10 crystals |
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| Authors: | I N Ogorodnikov V A Pustovarov A V Kruzhalov L I Isaenko M Kirm G Zimmerer |
| Institution: | 1. Ural State Technical University, ul. Mira 19, Yekaterinburg, 620002, Russia 2. Institute of Single Crystals, Siberian Division, Russian Academy of Sciences, Novosibirsk, 630058, Russia 3. II. Institut für Experimentalphysik der Universit?t Hamburg, Luruper Chaussee 149, Hamburg, D-22761, Germany |
| Abstract: | The paper presents the results of a complex investigation into the dynamics of electronic excitations in the CsLiB6O10 crystal (CLBO) by low-temperature luminescence VUV spectroscopy with subnanosecond time resolution under photoexcitation by synchrotron radiation. Strong broad-band low-temperature photoluminescence (PL) of the CLBO crystal has been revealed. Data on the PL decay kinetics, time-resolved PL and PL excitation spectra, and reflectance spectra at 9.3 and 295 K are obtained. It is shown that the intrinsic PL of CsLiB6O10 in the 3.5-eV range is caused by radiative annihilation of self-trapped excitons. The channels of creation and decay of relaxed and unrelaxed excitons in cesium lithium borate are discussed. The band gap of CLBO is estimated as E g≈8.5 eV. A monotonic increase in the excitation efficiency of intrinsic CLBO luminescence at exciting photon energies above 19 eV is identified as the photon multiplication process. |
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