This paper presented the photoluminescence of Tb-doped Mg-A1 layered double hydroxides (Tb-doped MgAI-LDHs) depending on phase transition caused by annealing. Tb-doped MgA1-LDHs structure transformed from hexagonal ...This paper presented the photoluminescence of Tb-doped Mg-A1 layered double hydroxides (Tb-doped MgAI-LDHs) depending on phase transition caused by annealing. Tb-doped MgA1-LDHs structure transformed from hexagonal LDHs, cubic MgO to spinel MgA1204 phase as temperature varied from 200 to 1000 ℃. Emission and excitation spectra of Tb-doped MgAI-LDHs obviously changed with phase transformation. The emissions of Tb3+ ions attributed to 5D4→TFJ transitions (J=3, 4, 5, 6) were observed in the emission spectra of all the Tb-doped samples. The ratio of (SD4→7F5)/(SD4→7F6) emission intensity, which was sensitive to surroundings of Tb3+ ion, markedly enhanced with temperature rising to 600 from 400 ℃. Over 600 ℃, the ratio of (SD4→TF5)/ (SD4→TF6) intensity tended to decreasing up to 1000 ℃. The change concerning the ratio of the (SD4→7F5)/(SD4→TF6) emission intensity might be due to various surroundings of Tb3+ induced by phase transformation.展开更多
基金supported by the National Natural Science Foundation of China(51162021)
文摘This paper presented the photoluminescence of Tb-doped Mg-A1 layered double hydroxides (Tb-doped MgAI-LDHs) depending on phase transition caused by annealing. Tb-doped MgA1-LDHs structure transformed from hexagonal LDHs, cubic MgO to spinel MgA1204 phase as temperature varied from 200 to 1000 ℃. Emission and excitation spectra of Tb-doped MgAI-LDHs obviously changed with phase transformation. The emissions of Tb3+ ions attributed to 5D4→TFJ transitions (J=3, 4, 5, 6) were observed in the emission spectra of all the Tb-doped samples. The ratio of (SD4→7F5)/(SD4→7F6) emission intensity, which was sensitive to surroundings of Tb3+ ion, markedly enhanced with temperature rising to 600 from 400 ℃. Over 600 ℃, the ratio of (SD4→TF5)/ (SD4→TF6) intensity tended to decreasing up to 1000 ℃. The change concerning the ratio of the (SD4→7F5)/(SD4→TF6) emission intensity might be due to various surroundings of Tb3+ induced by phase transformation.