Fluorescence of europium(III) in a flouride glass containing zirconium

Structure and properties of the KNbW2O9 hexagonal bronze doped with Eu3+ ions as an optically active probe

“…It should be mentioned in this point that the observed emission intensity was relatively weak in this system. The strongest band of the spectrum corresponds to the 5 D 0 → 7 F 2 transition, which is strongly hypersensitive to the surrounding of the Eu 3+ ion [19][20][21][22][23][24][25][26][27]. This transition is electric dipole allowed in contrast to the 5 D 0 → 7 F 1 transition which is purely magnetic dipole allowed.…”

“…This transition is electric dipole allowed in contrast to the 5 D 0 → 7 F 1 transition which is purely magnetic dipole allowed. The ratio between the integrated intensities of these transitions: I ( 5 D 0 → 7 F 2 ):I (( 5 D 0 → 7 F 1 ) = I 0-2 :I 0-1 , could serve as a probe of the covalent nature or asymmetry for the local sites of the Eu 3+ ions [19][20][21][22][23][24][25][26][27]. The change of the ratio of the I ( 5 D 0 → 7 F 4 ):I ( 5 D 0 → 7 F 1 ) = I 0-4 :I 0-1 integrated intensities upon the change of the excitation wavelength reflects the different bulk properties of the RE containing materials [21,23,24].…”

“…When the I 0-4 :I 0-1 ratio is considered, the values: 0.1 at 77 K (0.2 at 300 K) and 0.1 at 77 K (0.3 at 300 K) are obtained, respectively, for the 266 and 308 nm lines. The I 0-2 :I 0-1 hypersensitive ratio was related both to the covalency and the polarization of the surrounding of the Eu 3+ ion via short-range effects [20,21,[24][25][26] and the distortion of the local field around this ion [21,24,26]. The results obtained for the crystal studied here suggest that the coordination shell of the Eu 3+ ions associated with the ∼614 nm 5 D 0 → 7 F 2 transition is more covalent or more asymmetric than the coordination shell of the other site associated with the ∼619 nm transition.…”

Mechanism of the Yb–Er energy transfer in fluorozirconate glass

“…•xYbF 3 •1ErF 3 (xϭ0.2, 0.3, 0.5, 1, 3, 4.5, and 6͒; ͑ii͒ (94 Ϫy)(ZBLAN)•6YbF 3 •yErF 3 (yϭ1, 2, 3, 4, and 5͒; and ͑iii͒ (99Ϫy)(ZBLAN)•1YbF 3 •yErF 3 (yϭ1, 2, 3, 4, and 5͒ compositions.…”

Preparation of red-emitting phosphors [K0.8Y0.65Eu3+0.08][Mo0.2W0.8O4] and calculation of Eu3+ 5D0 quantum efficiency

“…Because linear strength of magnetic dipole transition nearly cannot be influenced by outer environment, the value of S md for a certain transition has no relation with the hosts and it is a constant. S md is calculated to be 7.83 × 10 −42 esu(c) cm 2 through the data in literature [27].…”