Luminescence properties of Tb-doped Ba3Y2O5Cl2

Herein, we report the synthesis and luminescence properties of Tb-doped layered perovskite oxychloride, Ba 3 Y 2 O 5 Cl 2 . Similar to Ba 3 Y 2 O 5 Cl 2 :Eu 3+ , single-phase Ba 3 Y 2 O 5 Cl 2 :Tb 3+ was successfully synthesized through a solid-state reaction. The luminescence properties were studied and compared with those of Y 2 O 3 :Tb 3+ . There was only one excitation peak due to the 4 f -5 d transition of Tb 3+ , which was different from that of Y 2 O 3 :Tb 3+ that comprises two peaks. Green emissions from Tb 3+ 4 f −4 f transitions were observed for both the samples. The luminescence properties at different doping concentrations were investigated. Concentration quenching at 8% was found, which is rather high, owing to the specially separated layered structure. The decay times of luminescence were also studied, which are consistent with the concentration quenching. In addition, energy diagram for the luminescence mechanism were also proposed. Considering the photoluminescence spectra and high concentration quenching, this compound is a potential mother compound for optical materials, especially for the green phosphors.