Absolute oscillator strengths of 5f-5f transitions of U4+ in ThBr4 and in hydrobromic acid solutions

Optical intensities of Pr3+ ions in transparent oxyfluoride glass and glass–ceramic. Applications of the standard and modified Judd–Ofelt theories

“…In the case of Pr 3+ ions, the first opposite-parity excited configuration is 4f 1 5d 1 and it is located at around 60,000 cm −1 , with an extension of around 20,000 cm −1 , so it is obvious that the above assumptions do not seem to hold for this trivalent ion. Different modifications of the standard Judd-Ofelt theory have been developed in order to take into account the energy dependence of the multiplets involved in the transition with the energy of the 4f 1 5d 1 configuration [10,11].…”

Comparison Between Standard and Modified Judd-Ofelt Theories in a Pr3+-Doped Fluoride Glass

“…Despite the different approaches between Refs. [5] and [6], it can be noted that Eq. (5) The fluorozirconate glass used to determine the experimental oscillator strengths has the following molar composition : ΖrF4:6Ο%, BaF2:31%ο, YF3:4%ο, ΡbF2:2%, AlF 3 :2% and LaF3:1%.…”

“…(4) has been considered first with an energy correction to the even terms but without the odd ones [5]. The energy of the 4f5d configuration is set at 60000 cm -1 [10].…”

f–f oscillator strengths, hypersensitivity, branching ratios and quantum efficiencies discussed in the light of forgotten results

“…Finally, it is recalled that the usual saying, "f-f transition are induced by the f-d mixing", may be clearly wrong as shown by an experimental results and trials to include Judd's parameters of odd order [16].…”