Luminescence of divalent ytterbium in magnesium fluoride crystals

Electron trap liberation in MgF2 doped with Yb2+ using a two-color excitation experiment

“…This underlying transient is well approximated by a single exponential decay having a decay time of 7.5 ms and is entirely consistent with the findings of Ref. 6. The increase in photoluminescence observed at a time delay of 150 ls arises from the application of an infrared pulse from the FEL.…”

“…The luminescent properties of MgF 2 :Yb 2þ have been reported previously. 6 In MgF 2 , divalent ytterbium occupies the Mg 2þ site, which is six-coordinate and has D 2h point group symmetry. Characteristic f !…”

“…6 They contained 0.6 mol% of ytterbium and were grown using the Bridgman technique in a reducing atmosphere. 335 nm excitation was provided by a Quantronix TOPAS traveling wave optical parametric amplifier (OPA) having a repetition rate of 1 kHz and a pulse length of 3 ps.…”

Luminescence studies of the rare earth ions-doped CaF2 and MgF2 films for wavelength conversion

“…For MgF 2 :Yb 2+ films, the luminescence due to the 4f 14 -4f 13 5d 1 transition of the Yb 2+ ion appeared at 474 nm. These spectra provide a good coincidence with those of the crystalline bulks already reported [10][11][12]. It should be noted that the RE doped compounds are not decomposed during evaporation process, because the 4f n -4f n − 1 5d 1 transitions of the rare earth ions are strongly influenced by the crystal fields of the ligand ions.…”

Luminescence properties of SrSi2O2N2 doped with divalent rare earth ions

“…The luminescence properties of Eu 2+ and Yb 2+ are often quite similar for the same host lattice [22,[32][33][34][35]. In general, the 4f 13 5d excited state of Yb 2+ is at a slightly higher energy ($0.1 eV) than the 4f 6 5d excited state of Eu 2+ resulting in a slightly blue-shifted fd emission for Yb 2+ .…”