Structure, luminescence properties and energy transfer of terbium and samarium co-doped barium based apatite phosphor with tunable emission colour

Decomposition of Luminescent Hydroxyapatite Scaffolds in Simulated Body Fluid

“…43−45 The emission spectrum for HAp:Tb, under excitation at 228 nm, exhibits four peaks centered at 493, 547, 591, and 626 nm (labeled C, D, E, and F) and corresponds to the transitions 5 D 4 → 7 F 6 , 5 D 4 → 7 F 5 , 5 D 4 → 7 F 4 , and 5 D 4 → 7 F 3 , respectively. 46 The emission bands marked G, H, I, and J for HAp:Eu correspond to the transitions 5 F 1 , 5 D 0 → 7 F 2 , 5 D 0 → 7 F 3 , and 5 D 0 → 7 F 4 with centers at 594, 617, 655, and 698 nm, respectively. 47 Table 1 summarizes the EDS results of the scaffolds before and after immersion during the 4 weeks of testing in SBF.…”

“…The emission spectra of the HAp:Eu, HAp:Ce, and HAp:Tb powders (Figure ) show the characteristic emission peaks for Eu 3+ , Ce 3+ , and Tb 3+ ions, respectively. HAp:Ce, under excitation at 265 nm, shows a broad band at 360 nm, attributed to the transitions 2 D 3/2 → 2 F 5/2 and 2 D 3/2 → 2 F 7/2 (labeled A and B). − The emission spectrum for HAp:Tb, under excitation at 228 nm, exhibits four peaks centered at 493, 547, 591, and 626 nm (labeled C, D, E, and F) and corresponds to the transitions 5 D 4 → 7 F 6 , 5 D 4 → 7 F 5 , 5 D 4 → 7 F 4 , and 5 D 4 → 7 F 3 , respectively . The emission bands marked G, H, I, and J for HAp:Eu correspond to the transitions 5 D 0 → 7 F 1 , 5 D 0 → 7 F 2 , 5 D 0 → 7 F 3 , and 5 D 0 → 7 F 4 with centers at 594, 617, 655, and 698 nm, respectively …”