Time-resolved photoluminescence of barium titanate ultrafine powders

Time-resolved photoluminescence (PL) near 540nm, taken from barium titanate (BaTiO3) ultrafine powders of ∼80, 90, and 110nm in size, was measured at 11K. Two-exponential functions were found to fit the decay curves well, and the decay lifetimes were composed of one short, about 10ns, and one long, about 200ns, time constants, respectively. Results also indicate that the PL peaks show a small blueshift with decreasing BaTiO3 particle size. The decay process consists of the recombination of self-trapped excitons (long lifetime decay) and of the electrons in the surface states with the holes in the valence band (short lifetime decay). The short lifetime component makes comparable contribution to the decay intensity of PL with the long lifetime one.