摘要(英) |
Excitation, photoluminescence, and time-resolved spectra of the Eu3+-containing compounds including Eu(NO3)3, Eu2O3, and R2(C8H10O4)3 were obtained. The coordination polymers, R2(C8H10O4)3, were synthesized by mid-temperature hydrothermal technique with various compositions of trivalent europium (Eu) or yttrium (Y) as the coordination center and 1,4-cyclohexanedicarboxylate (C8H10O4, CHDC) as the ligands. Single-crystal and powder X-ray diffraction data were collected for determining the structure and purity, while inductively coupled plasma atomic emission spectra (ICP-AES) were recorded for verifying the compositions. Blue shift emission signals are observed in the emission spectra of these Eu3+-containing compounds at 561 nm excitation. Power dependence and temperature dependence experiments indicate the blue shift emission results from one-photon hot band transition to the 5D1 excited state. We acquired the Eu3+ 5D17FJ emission decay curves and 5D07FJ emission rising curves of these compounds. The 5D1 state emission lifetimes and intensities are quite different in these compounds, whereas the 5D0 state emission lifetimes and intensities are roughly the same. This phenomenon could arise from two possible (Eu3+-Eu3+ and Eu3+-CHDC) cross relaxation processes that relax 5D1 to 5D0 at different rates among these compounds. |
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