title: Emission and excitation spectra of Ce3+ and Pr3+ ions in hexafluoroelpasolite lattices.
abstract: The emission and excitation spectra of Ce(3+) and Pr(3+) doped into the cubic host Cs(2)NaYF(6) have been recorded at room temperature and ∼10 K using synchrotron radiation. The two 5d(1) T(2g) states of Ce(3+) have been located from the excitation spectra, whereas the E(g) state is placed above the host band gap. Decay measurements of the 5d(1) → 4f(1) Ce(3+) emission, and spectra collected using selective excitation, indicate the occupation of more than one type of site by Ce(3+) in this host lattice. By contrast, the location of features in the 4f(1)5d(1) → 4f(2) emission of Pr(3+) is independent of the excitation wavelength. Assignments are presented for some of the 4f(1)5d(1) levels and for the Pr(3+)-F(-) charge transfer band. The 5d emission lifetimes for Ce(3+) and Pr(3+) in the Cs(2)NaYF(6) host are 42 and 29 ± 1 ns, respectively, and are not temperature-dependent.
authors.affiliation: Department of Physics, University of Science and Technology of China, 96 Jinzhai Road, Hefei 230026, Anhui, People's Republic of China.
authors.forename: Chang-Kui
authors.initials: CK
authors.lastname: Duan
authors.forename: Peter A
authors.initials: PA
authors.lastname: Tanner
authors.forename: Vladimir
authors.initials: V
authors.lastname: Makhov
authors.forename: Nicholas
authors.initials: N
authors.lastname: Khaidukov