Optical spectroscopy of zinc metaphosphate glasses activated by Ce³⁺and Tb³⁺ions

Abstract

The photoluminescence of Ce3+ and Tb3+ ions in zinc metaphosphate glasses is investigated. The blue and green emissions of Tb3+ ions are enhanced upon UV excitation through energy transfer from Ce3+ to Tb3+ ions. The efficiency of such an energy transfer was estimated based on spectroscopic data and resulted in being about 20–23%. Spectroscopic data revealed that the energy transfer occurs via a non-radiative process inside Ce3+–Tb3+ clusters formed in the glass. This ion clustering could be useful for the design of efficient conversion phosphors of ultraviolet to blue and green light.

Luminescent properties and energy transfer mechanism of NaGd(MoO4)2:Sm3+, Eu3+ phosphors

“…Moreover, the energy transfer probabilities ( ) A t from Sm 3 þ to Eu 3 þ can be obtained by the following formula [22]:…”

Photoluminescence of Ag nanoparticle embedded Tb3+/Ce3+codoped NaYF4/PVP nanofibers prepared by electrospinning

“…The broad band between 280 and 420 nm is ascribed to the 5d-2 F J transition of Ce 3+ ions. And the other eight emission peaks [18][19][20]. Due to the broad emission band of the pure PVP nanofibers under the 254 nm excitation, we use a 512 nm filter to measure the emission spectra in the following experiments.…”

“…From the excitation and emission spectra in figure 6, it can be deduced that efficient energy transfer has happened in NaYF 4 :0.05Tb·0.05Ce/PVP electrospun nanofibers. The 5d-4f electric dipole allowed transitions of Ce 3+ ions are several orders of magnitude stronger than the 4f intraconfigurational transitions of Tb 3+ ions, so Ce 3+ ions can strongly absorb UV radiation and transfer its energy to Tb 3+ ions [20]. Figure 7 shows the schematic diagram of the energy transfer between Ce 3+ and Tb 3+ ions of NaYF 4 :0.05Tb·xCe/PVP (4) Figure 8 shows the UV-visible absorption spectra of AgNO 3 doped NaYF 4 :0.05Tb·0.05Ce/PVP electrospun precursor solution.…”

Enhanced green upconversion luminescence in Yb–Tb co-doped sintered silica nanoporous glass

“…The overall fitting result shows that the analysis using the multipolar interaction scheme produces a relatively good fit between the theoretical calculation and the measured data [19]. Furthermore, we calculated the average decay time (s m ) and the energy transfer efficiency (g ET ) as follows [21]:…”

“…decay curves could be analyzed using the well-known direct quenching mechanism [19]. Usually, the interaction scheme involves both the dipole-dipole and the dipole-quadrupole interactions, which can be described by Inokuti-Hirayama formula [10,20,21]. The rare-earth ions doped in nanoporous glass tend to accumulate at the internal surface of the nanopores and channels of porous glass; therefore, the concentration of rare-earth ions is different everywhere.…”