High-resolution vacuum ultraviolet spectroscopy of 5d-4f transitions in Gd and Lu fluorides

[摘要] Observation, investigation, and characterization of vacuum ultraviolet (VUV) (similar to10 eV) luminescence due to interconfigurational 4f(n-1)5d-4f(n) transitions in Gd3+ and Lu3+ are reported. High-resolution (similar to0.5 Angstrom) VUV emission and excitation spectra as well as decay kinetics of VUV luminescence have been measured for LiGdF4, GdF3, LiLuF4, and LuF3 crystals using synchrotron radiation. The obtained results are the direct proof that the VUV luminescence observed from LiGdF4 or GdF3 crystals and LiLuF4 or LuF3 originates from 4f(6)5d-4f(7) transitions in Gd3+ and 4f(13)5d-4f(14) transitions in Lu3+, respectively. The fine structure due to zero-phonon and vibronic lines was well resolved in VUV emission and excitation spectra of LiGdF4, whereas the spectra of GdF3 and LuF3 have a smooth shape because of stronger electron-lattice coupling between the 4f(n-1)5d electronic configuration of the Gd3+ and Lu3+ ions and the lattice vibrations.

[发布日期] 2004-12-01

[关键词] TRIVALENT LANTHANIDES;SYNCHROTRON RADIATION;SPIN-FORBIDDEN;CRYSTALS;LIYF4;LUMINESCENCE;ABSORPTION;EMISSION;TRIFLUORIDES;FLUORESCENCE