Synthesis, structure and photoluminescence properties of Ho3+ doped TTB-BaTa2O6 phosphors

Ilhan M.

SOLID STATE SCIENCES, cilt.38, ss.160-168, 2014 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 38
  • Basım Tarihi: 2014
  • Doi Numarası: 10.1016/j.solidstatesciences.2014.08.015
  • Dergi Adı: SOLID STATE SCIENCES
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Sayfa Sayıları: ss.160-168
  • Anahtar Kelimeler: BaTa2O6, TTB, Ho3+, Phosphors, Photoluminescence, RED EMITTING PHOSPHOR, ENERGY-TRANSFER, LUMINESCENCE PROPERTIES, CRYSTAL-CHEMISTRY, PHOTON AVALANCHE, BATA2O6, PHASE, CE3+, RAY, TA
  • Marmara Üniversitesi Adresli: Evet

Özet

Ho3+ doped TTB-BaTa2O6 phosphors were produced by the solid state reaction method. XRD analysis confirmed the formation of BaTa2O6 single phase which was accomplished by heat treatment at 1425 degrees C for 20 h. The crystal structure of TTB-BaTa2O6 allowed doping concentration of Ho3+ ions up to 10 mol%, maintaining a single phase composition. A second phase of HoTaO4 begins to appear at 15 mol%. The lattice structure and the crystallite sizes changed with the concentration of Ho3+. In SEM analysis, it was also shown that BaTa2O6 grain sizes changed with the concentration of Ho3+. EDS analysis revealed that the Ta/Ba ratio increased on the grains depending on Ho3+ concentration. Charge balance of the structure was formulated through the EDS results. In fluorometer analysis, a strong green emission (lambda(em) = 546.9 nm) was observed in the visible spectral region. The emission increased with the doping concentration of up to 2.5 mol%, and above this level decreased due to concentration quenching. (C) 2014 Elsevier Masson SAS. All rights reserved.