Optical spectra of octahedral cubic and trigonal Yb3+ impurity centers in KMgF3 and KZnF3 crystals

Optical spectroscopy of Yb3+ in the Cs2NaYF6 single crystal

“…However, the frequencies of the main lines slightly differ leading to the shift of the crystalfield (CF) parameters B k from those obtained in Refs. [16,19].…”

“…This g-factor is calculated on the wave functions of the lowest doublet G 6 being purely cubic and independent of CF. For comparison, in Table 3, the CF parameters for Yb 3+ (T c ) in single crystals KMgF 3 , KZnF 3 and CsCaF 3 [19] are given. Table 3 and Fig.…”

EPR, ENDOR and optical spectroscopy of Yb3+ ion in KZnF3 single crystals

“…It is also possible to state that a rather weak distortion of the cubic symmetry field takes place during the formation of T tet in KZnF 3 that is directly seen from the comparison of the crystal field parameters of T tet and T cub in Table 3. It should be noted that the given crystal field parameters of the cubic Yb 3 þ center somewhat differ from the values of parameters [8], since the interpretation of the luminescence lines was specified and new positions of the energy levels were calculated, which along with the experimental values are presented in Table 4. For comparison it also shows data for the isomorphous KMgF 3 crystal.…”

“…Arrows indicate lines belonging of the studied Yb 3 þ (T tet ). The belonging of these lines to this center was established by comparing the observed spectra with luminescence and excitation spectra of Yb 3 þ (T cub ) and Yb 3 þ (T trig ) in KZnF 3 studied in [8]. It follows from the analysis of the spectra that the luminescence peaks denoted by numbers 2-4 in Fig.…”

EPR and optical spectroscopy of the Tm2+ ion in the KMgF3 single crystal

“…Table 4 Parameters (in cm À 1 ) B k and x for Tm 2 þ and Yb 3 þ (T c ) in perovskite-type crystals. [15] parameters for Yb 3 þ (T c ) in the KMgF 3 , KZnF 3 and CsCaF 3 single crystals [14,16] are given in Table 4 for comparison. It is seen in Table 4 that the CF parameters for Tm 2 þ (T c ) are in good agreement with the parameters for Yb 3 þ (T c ).…”