Dynamics of the excitation and upconversion processes in YAlO3: Pr single crystals

Spectroscopic properties of Pr3+:SrMoO4 crystal

“…7 shows the luminescence decay curve of the 1 D 2 → 3 F 4 transition, and lifetime measurements show a single exponential for 1 D 2 level too. This suggests that no energy transfer processes involving the 1 D 2 level are present in this system and the mean value of the fluorescence lifetime was estimated to be 92.88 s, which can be compared with Pr 3+ :YAP: 28 s [22]. The quantum efficiency was calculated to be 93.39% according the equation Á = f / r for the 1 D 2 → 3 F 4 transition, which is higher than Pr 3+ :YAG: 90% [16].…”

Optical spectroscopy of Ca3Sc2Si3O12, Ca3Y2Si3O12 and Ca3Lu2Si3O12 doped with Pr3+

“…For the samples containing 0.2% Pr 3 + some residual slow defect-related intrinsic emission at 380 nm is present. The lines around 610 nm are assigned to the 1 D 2 -3 H 4 radiative transition within the 4f 2 configuration; the relative intensity of the 5d-4f transitions with respect to the 4f-4f ones increases with the Pr 3 + concentration, as the 1 D 2 emission is significantly affected by concentration quenching due to cross-relaxation [16].…”

Spectroscopic properties of Pr3+:Gd3Ga5O12 crystal

“…And the lifetime 3 P 0 → 3 H 6 transition was fitted to be 21.0 s, which 44]. By following the calculation equation of quantum efficiency Á = f / r , we can obtain the quantum efficiencies of 3 P 0 → 3 H 6 transitions to be 29.6%, which can be compared with the quantum efficiencies of 1% Pr:YAG (82.3% [37]) and 1% YAP (70% [43]). The relatively low quantum efficiency of this transition might be due to the static perturbations of the crystal fields led by Gd 3+ in octahedral a sites being a non-stoichiometric defect [21].…”

“…And the lifetime the 1 D 2 manifold is estimated to be 118.4 s by using = (B 1 1 2 + B 2 2 2 )/(B 1 1 + B 2 2 ) [29], which is much longer than that of 3 P 0 level. The experimental lifetime value of the 1 D 2 level can be compared to that of 1 mol%Pr:GGG nanocrystalline: 110s [25], 0.5% Pr 3+ :YAG: 110s [45] and of 1% Pr 3+ :YAP: 28s [43]. It is interesting to point that at 4 K the decay 1 D 2 → 3 H 4 profile of Pr:GGG is exponential with a lifetime of 260 s [23], as in contrast with the above results of this job.…”