Studying crystal-field splitting difference of Eu3+ ions from orthorhombic to cubic Ca4Al6SO16

摘要: Abstract Eu3+ lanthanide ion possesses abundant 4f-4f transition lines in the visible spectral region, and its spectroscopic changes can sensitively reflect variation of local ligand environments. Here, ions are successfully introduced into Ca4Al6SO16 lattice, structural difference from orthorhombic (o-Ca4Al6SO16) to cubic (c-Ca4Al6SO16) phases is systematically analyzed. On that basis, related influence on crystal-field splitting discussed detail. The obtained results indicate Eu:o-Ca4Al6SO16 Eu:c-Ca4Al6SO16 have three two non-degenerate 5D0→7F0 peaks, respectively. Through theoretical analysis low-temperature (78 K) luminescent investigation with changing excitation wavelength, those non-equivalent Ca2+ sites assigned as o-Ca(1) (~577.6 nm), o-Ca(3) (~579.6 nm), o-Ca(4) (~580.6 nm), c-Ca(1) (~578.7 nm), c-Ca(2) (~580.2 nm), In addition, increase c-Ca4Al6SO16 content sintered product, fluorescence intensity ratios I580.6/I613.7, I616.2/I613.7 I621/I613.7 present a gradual decreasing tendency. And, introduction as-prepared product beneficial for increasing decay lifetime 5D0 excited state enhancing resistance capability thermally induced quenching. What this work might provide some useful thoughts multi-phase studies broaden application range fluorescent probes.