摘要(英) |
This thesis investigates the blue shift signal in the emission spectra of coordination polymers containing trivalent samarium (Sm3+). These coordination polymers were synthesized using mid-temperature hydrothermal technique and have trivalent samarium (Sm3+), terbium (Tb3+), or yttrium (Y3+) as the coordination center and 1,4-cyclohexanedicarboxylate (C8H10O4,CHDC) as ligands. Previous study observed a blue shift signal at 530 nm in the emission spectra of coordination polymers containing Sm3+ at 560 nm excitation. This work acquires excitation spectra, photoluminescence spectra, time-resolved spectra, and power dependence measurements of these compounds. In these coordination polymers, the 530 nm blue shift signal results from one-photon hot band transition to the Sm3+ 4F3/2 highly excited state, and the energy transfer from the ligands to Sm3+ 4F3/2 was observed. The coordination polymers with different Sm3+ concentration exhibit different emission lifetimes of the 530 nm signal since there are two cross relaxation mechanisms in these compounds. In the coordination polymers containing Sm3+ and Tb3+, the energy transfer from Tb3+ to Sm3+ 4F3/2 was found. In addition, in comparison with the coordination polymers containing Y3+, we discover a portion of the Sm3+ 4F3/2 state energy could transfer to the non-adjacent Sm3+ via Tb3+. |
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