Excitation, photoluminescence, and time-resolved emission spectra of the Eu3+-containing compounds, YxEu2-x(CHDC)3, Eu(NO3)3·5H2O, and Eu2O3 were obtained. The coordination polymers, R2(C8H10O4)3, (R = Eu or Y), were synthesized by mid-temperature hydrothermal technique with the 1,4-cyclohexanedicarboxylate (C8H10O4, CHDC) ligands. Blue-shift emission signals were 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. The Eu3+ 5D1→7FJ emission decay curves and 5D0→7FJ emission rising curves of these compounds were acquired. The 5D1 state emission lifetimes are quite different in these compounds and are correlated with the 5D1 → 5D0 relaxation rates. Our analysis shows two possible (Eu3+-Eu3+ and Eu3+-CHDC) cross-relaxation processes that relax 5D1 to 5D0 with different rates in these compounds.
- coordination polymer
- excited state energy relaxation
- trivalent europium