Optical investigation of Eu3+:PbF2 ceramics and transparent glass–ceramics

Long-lived emission from Eu3+:PbF2 nanocrystals distributed into sol–gel silica glass

“…Moreover, the RE 3? contribution in nanocrystals or in matrix was examined by other research groups, such as de Pablos-Martin et al [7,9], Bensalem et al [21] and Armellini et al [22]. Our results from luminescence spectra are in good agreement with data obtained by referred authors.…”

“…and surrounding ligands has been analyzed in detail by Khan et al [2], Santana-Alonso et al [11] and Bensalem et al [21]. The values of R parameters obtained for glass sample containing PbF 2 nanocrystals presented in our work are in a good agreement with those estimated for other nanocrystalline fluoride-based systems, such as NaYF 4 [11] and PbF 2 obtained by traditional high-temperature meltquenching technique [21].…”

“…7 F J transitions. The luminescence decay curves measured for samples before and after heat treatment were [12,13] and by Bensalem et al [21], but is much higher than value obtained by Khan et al [2]. As pointed out above, the photoluminescence spectra and R ratio as well as their 5 D 0 fluorescence lifetimes of europium ions doped to glass before and after heat treatment in examined systems are markedly different.…”

“…migrates from the glass to another phase upon ceramisation. Bensalem et al [21] has identified this phase to be Eu 3? :b-PbF 2 .…”

Interpretation of europium(III) spectra

“…Site-selective spectroscopy can excite single sites, but it is difficult to get an overall picture of the glass structure. Eu 3+ can be used to monitor the partial crystallization of glasses and the formation of glass ceramics [639][640][641][642][643][644][645]. [646].…”