Emission spectra from the 5D1 excited state of the compounds containing Eu3+

Abstract Excitation, photoluminescence, and time‐resolved emission spectra of the Eu 3+ ‐containing compounds, Y x Eu 2‐x (CHDC) 3 , Eu(NO 3 ) 3 ·5H 2 O, and Eu 2 O 3 were obtained. The coordination polymers, R 2 (C 8 H 10 O 4 ) 3 , (R = Eu or Y), were synthesized by mid‐temperature hydrothermal technique with the 1,4‐cyclohexanedicarboxylate (C 8 H 10 O 4 , CHDC) ligands. Blue‐shift emission signals were observed in the emission spectra of these Eu 3+ ‐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 5 D 1 excited state. The Eu 3+ 5 D 1 → 7 F J emission decay curves and 5 D 0 → 7 F J emission rising curves of these compounds were acquired. The 5 D 1 state emission lifetimes are quite different in these compounds and are correlated with the 5 D 1 → 5 D 0 relaxation rates. Our analysis shows two possible (Eu 3+ ‐Eu 3+ and Eu 3+ ‐CHDC) cross‐relaxation processes that relax 5 D 1 to 5 D 0 with different rates in these compounds.