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CPP: Chemische Physik und Polymerphysik
CPP 25: POSTER Electronic Structure and Spectroscopy
CPP 25.18: Poster
Thursday, March 30, 2006, 17:00–19:00, P2
Luminescent characterization of perovskite-like layered strontium lanthanum titanate compounds — •Volodymyr Chumak1, Yu. Titov1, M. Slobodyanik1, S. Nedilko2, O. Chukova2, and P. Smolyar 2 — 1Chemistry faculty of Kyiv National Taras Shevchenko University, 64, Volodymyrska str., 01033, Kyiv, Ukraine — 2Physics faculty of Kyiv National Taras Shevchenko University
First the peculiarities of the luminescent emission of the five-slab perovskite-like SrLa4−xLnxTi5O17 (Ln = Pr, Yb) compounds belonged to the AnBnO3n+2 - family are found and described.
Photoluminescence and excitation spectra were obtained at 4.2, 77 and 300 K. Luminescence was excited by radiation from the the N2-laser, the Ar-laser, powerful xenon lamp DKsL-1000. The luminescence was registered using MDR-2 and DFS-12 diffraction spectrometers which cover wide spectral region. Reflection, excitation and luminescence spectra were also investigated using synchrotron radiation in the energy region 3.5-20 eV. Experiments with synchrotron radiation were carried on at SUPERLUMI station at HASYLAB (DESY), Hamburg, Germany.
Results of experimental studies allowed us to conclude that mentioned above the sets of compound could be regarded as perspective phosphors, i. e. the transformers of the UV or IR emission into visible light, or the white-light-emitting and storage phosphors, perspective laser materials. When doped with the rare earth ions Pr3+ or Yb3+ they are considered as perspective fast-scintillation materials.