| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 1522557 | Materials Chemistry and Physics | 2013 | 9 Pages |
•Eu3+-doped lead fluorophosphate glasses were prepared by melt quenching method.•Characterized the structural and optical properties of these glasses.•The glasses show efficient luminescence and longer lifetimes for the 5D0 level.•Eu3+:lead fluorophosphate glasses can be useful for red laser source applications.
The Eu3+-doped lead fluorophosphate glasses of composition 44 P2O5 − 17 K2O − 9 Al2O3 − (24 − x) PbF2 − 6 Na2O − x Eu2O3, where x = 0.1, 0.5, 1.0 and 2.0 mol%, have been prepared by conventional melt quenching technique and are characterized through thermal, vibrational, absorption and emission spectra and decay rate measurements. Judd–Ofelt (JO) intensity parameters (Ωλ, λ = 2, 4 and 6) have been evaluated from the absorption spectrum as well as emission spectrum of 1.0 mol% Eu2O3 doped glass. The JO parameters derived from the absorption spectrum have been used to calculate important radiative properties such as transition probability (A), lifetime (τR), branching ratio (βR) and peak stimulated emission cross-section (σe(λp) ) for the 5D0 → 7FJ (J = 0, 1, 2, 3 and 4) transitions of the Eu3+ ions. The decay rates of the 5D0 fluorescent level of Eu3+ ions in the title glasses are found to be single exponential for all the studied Eu3+ ion concentrations. A marginal increase in lifetime of the 5D0 level has been noticed with increase in Eu3+ ion concentration from 0.1 mol% to 2.0 mol%. From the absorption spectra, the optical band gap energy (Eopt) and Urbach energy (ΔE) have been evaluated from their ultraviolet absorption edges. All the obtained results in the present study were reported and discussed in detail.
Graphical abstractThe Eu3+-doped lead fluorophosphate glasses have been prepared and characterized. From the emission spectra, the emission intensity of all observed transitions increases with increase of Eu3+ ion concentration. The luminescence intensity ratio (R) between electric (5D0 → 7F2) and magnetic (5D0 → 7F1) dipole transitions provide valuable information about the red color (5D0 → 7F2) richness in comparison with orange (5D0 → 7F1) color in developing red laser sources. Figure shows the emission spectra of Eu3+-doped lead fluorophosphate glasses (inset shows the variation of R with Eu3+ ion concentration).Figure optionsDownload full-size imageDownload as PowerPoint slide
