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CPP: Chemische Physik und Polymerphysik

CPP 27: POSTER Polymer Physics and Materials

CPP 27.35: Poster

Donnerstag, 30. März 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, 64, Volodymyrska str., 01033, Kyiv, Ukraine

First the peculiarities of the luminescent emission of the five-slab perovskite-like SrLa_4−xLn_xTi₅O₁₇ (Ln = Pr, Yb) compounds belonged to the A_nB_nO_3n+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.