Different luminescence behaviors of SnO2/Eu3+ and SnO2/Tm3+ co-doped phosphate glasses

UV Emission of Gd3+ in the Presence of Cu2+: Towards Luminescence Quenching through Quantum Cutting?

“…Tm 3 + ). [27] The origin of such a state is possibly related to defects in the glass matrix, as considered by Shen et al [27] Accordingly, it is, herein, postulated that the Gd 3 + !Cu 2 + energy transfer may occur through a downconversion process involving a virtual state in Gd 3 + , by which the resonance condition for Cu 2 + absorption is fulfilled. The proposed energy-transfer pathway is represented schematically in Figure 4.…”

Influence of tungsten on the emission features of Nd3+, Sm3+ and Eu3+ ions in ZnF2–WO3–TeO2 glasses

“…The transitions, 7 F 0 → 5 D 2 in the absorption spectrum and 5 D 0 → 7 F 2 in the emission spectrum of Eu 3+ are reported to be hypersensitive; the integrated emission intensity ratio of 5 D 0 → 7 F 2 (red) and 5 D 0 → 7 F 1 (orange) transitions (R/O ratio) is strongly influenced by site asymmetry and covalency of the bonds with the ligand anion [32,33]. The effect of surrounding ions on the luminescence of europium in glass has been reported in several works [34][35][36] which clearly indicated that the relative intensities of the Eu 3+ emission peaks depend strongly on the variations in the glass network at the vicinity of this ion. Eu 3+ ion has the additional feature of interest; phonon side band studies can give information about the electron-phonon coupling strength with the host lattice and also throw light whether, non-radiative or radiative decay is favoured.…”

Novel SnO2/MnO co-doped phosphate glasses with tunable luminescence properties

“…To enhance luminescence of glasses, energy transfer (ET) mechanisms between dopants have been extensively investigated. While many published work in this respect have traditionally focused on RE pairs [10][11][12] and recently moved to SCO/RE or RE/TM pairs [6][7][8]13], ET processes between SCO/TM pairs is scarcely reported.…”

“…Other frequently reported dopants in glasses include semiconducting oxides (SCO) and transition metal (TM) ions. SCO normally shows an intense luminescence in near ultraviolet and visible region due to its strong optical transitions from the valence to the conduction band [5][6][7][8], while fluorescence mechanism of TM ions usually involves both parity and spin forbidden transitions with the relatively weak emissions [9]. To enhance luminescence of glasses, energy transfer (ET) mechanisms between dopants have been extensively investigated.…”