Enhanced approach to the Eu3+ ion 5D0→7F0 transition intensity

Structural and luminescent properties of red-emitting Eu3+-doped ternary rare earth antimonates R3SbO7 (R = La, Gd, Y)

“…7(c)); however, based on Judd-Ofelt theory, 25,26 5 D 0 / 7 F 0 in Eu 3+doped compounds is highly forbidden for both electric-dipole (ED) and magnetic-dipole (MD) transition; 27,28 therefore, this abnormal phenomenon is not in agreement with Judd-Ofelt theory. The unusually strong 5 D 0 / 7 F 0 transitions have been reported in other materials, [29][30][31] for example, Eu 3+ -doped Ba 2 SiO 4 , 32 La 2 Si 2 O 7 , 33 BiCa 4 (PO 4 ) 3 O, 34 CuLaO 2 , 35 and BaFCl microcrystals, 27 there are different explanations for this phenomenon. Firstly, this phenomenon has been ascribed to several competing mechanisms, involving the mixing of two different states with different J values (J mixing), the breakdown of the closure approximation and/or Wybourne-Downer mechanism and relativistic effects.…”

Interpretation of europium(III) spectra

“…The occurrence of this transition is a well-known example of the breakdown of the selection rules of the Judd-Ofelt theory (a 0-0 transition is forbidden by the J selection rule of the Judd-Ofelt theory). Several authors have tried to theoretically explain why this transition is observed [132][133][134][135][136][137][138][139][140][141][142]. Theoretical models include the breakdown of the closure approximation in the Judd-Ofelt theory and third order perturbation theory.…”

Structural and photoluminescence properties of stannate based displaced pyrochlore-type red phosphors: Ca3−xSn3Nb2O14:xEu3+

“…35 But, in our system, 5 D 0 -7 F 0 levels exhibit a sharp and single peak which offers the possibility of doping of Eu 3+ ions to the Ca site. The unusually strong 5 D 0 -7 F 0 transitions have been reported in other materials, 5,[36][37][38][39][40][41][42] and there are different explanations for this phenomenon. One explanation is based on the mixing of two different states with different J values, the breakdown of the Wybourne-Downer mechanism and relativistic effects.…”