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@ARTICLE{Pustovarov:418130,
      author       = {Pustovarov, Vladimir and Ogorodnikov, Igor and Kozlov,
                      Alexander and Isaenko, L. I.},
      title        = {{A} luminescence-optical spectroscopy study of
                      $\mathrm{{R}b_{2}{KT}i{OF}_{5}}$ single crystals},
      journal      = {Optical materials},
      volume       = {80},
      issn         = {0925-3467},
      address      = {Amsterdam [u.a.]},
      publisher    = {Elsevier Science},
      reportid     = {PUBDB-2019-00217},
      pages        = {47 - 56},
      year         = {2018},
      note         = {© Elsevier B.V.},
      abstract     = {Large single crystals of Rb$_2$KTiOF$_5$ (RKTF), grown by
                      slow solidification method, were studied (7–400 K) for
                      various types of optical and radiation effects. The optical
                      absorption spectra, the parameters of the Urbach rule at
                      293 K (σ = 0.24 and  = $E_U$105 meV), the
                      low-temperature reflection spectra (T = 7 K,
                      E = 3.7–22 eV) were determined. The luminescence
                      spectra (1.2–6.2 eV) and luminescence decay kinetics are
                      studied upon excitation by a nanosecond electron beam (PCL),
                      ultraviolet and vacuum ultraviolet light (PL), or X-rays
                      radiation (XRL). PL excitation spectra under selective
                      photoexcitation by synchrotron radiation
                      (E = 3.7–22 eV, T = 7 K), temperature
                      dependences of the intensity of steady-state XRL in
                      different emission bands, as well as thermoluminescence
                      (7–400 K) are studied. In the visible spectral region,
                      we detected three luminescence bands that were attributed to
                      radiative annihilation of intrinsic excitons (2.25 eV),
                      recombination-type luminescence (2.1 eV) and luminescence
                      of higher TiOF$_5$ complexes (1.9 eV). The exponential
                      component with lifetime of about 19 μs was revealed in the
                      PCL decay kinetics at 2.25 eV. The low-energy onset of the
                      intrinsic host absorption  $E_c$= 3.55 eV was
                      determined on the basis of the experimental data obtained.
                      Spectra of optical constants were calculated by the
                      Kramers-Krönig method, the energy of the onset of the
                      interband transitions  $E_g$= 4.2 eV was determined,
                      and the main peaks of the optical spectra were identified.},
      cin          = {DOOR},
      ddc          = {670},
      cid          = {I:(DE-H253)HAS-User-20120731},
      pnm          = {899 - ohne Topic (POF3-899) / FS-Proposal: I-20110050
                      (I-20110050) / FS-Proposal: I-20110841 (I-20110841)},
      pid          = {G:(DE-HGF)POF3-899 / G:(DE-H253)I-20110050 /
                      G:(DE-H253)I-20110841},
      experiment   = {EXP:(DE-H253)D-I-20150101},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000435053600007},
      doi          = {10.1016/j.optmat.2018.04.027},
      url          = {https://bib-pubdb1.desy.de/record/418130},
}