NANOSYSTEMS: PHYSICS, CHEMISTRY, MATHEMATICS, 2013, 4 (2), P. 269–275
PHOTOLUMINESCENCE IN Fe3+ ION DOPED BARIUM TITANATE NANOPARTICLES
P. Barik – Department of Physics, Visva-Bharati University, Santiniketan-731235, W.B., India; pbarik mid1983@yahoo.co.in
T.K. Kundu – Department of Physics, Visva-Bharati University, Santiniketan-731235, W.B., India; tapaskumar.kundu@visva-bharati.ac.in
Fe3+ ion doped barium titanate (BT) nanopowders were synthesized by the sol gel route. The average size of tetragonal bariun titanate (t-BT) powders lies in the range 16–40 nm. The specimens show ultraviolet (UV) emission (peak at 376 nm) along with emission in violet, blue, green and yellow color. The blue band (peak at 452 nm) is seen to grow significantly with annealing temperature. This band arises due to Ti3+ defects which are stabilized by Fe3+ ions in BT specimens. The samples show two distinct Electron Paramagnetic Resonance (EPR) bands of g-value around 4.11 and 1.98, which originated from Fe3+ ions and Ti3+ defects respectively. A correlation between the photoluminescence (PL) and EPR band intensity, grown from same species, was found.
Keywords: barium titanate, photoluminescence, nanoparticles.
PACS 78.67.Bf, 78.55.Qr