Luminescence Characteristics of Ba0.5Sr0.5TiO3∶Prx,Aly Powders Synthesized by Citrate-Nitride Combustion Process

摘要

Ba0.5Sr0.5TiO3∶Pr powders co-doped with and without Al were synthesized by citrate-nitride combustion process.To investigate the effect and mechanism of Al dopant,samples with various Al3+ and Pr3+ content were prepared.The excitation and emission spectra were detected.Enhanced red emission around 613 nm was obtained by Al addition.Moreover,an emission at 491 nm was observed.Substitute situation of Pr3+ ions in the lattice was discussed.And the mechanism of energy transition was explained by the model of an intermediate charge transfer state.