Abstract
History: A new series of Dy3+ ions doped lead fluoroborate glasses containing different alkaline earth oxides of composition 20PbF2-10Li2O-5RO-5ZnO-59B2O3-1Dy2O3 (R = Ba, Sr and Ca; abridged as PLRZFB: Dy) were prepared by conventional melt quenching method.
Method: The non-crystalline nature and the glass transition temperatures (Tg) of the prepared glass samples were confirmed through XRD studies and DSC analysis respectively. The EDS analysis was performed to know the elements present in the prepared glass compositions. The Judd-Ofelt (JO) intensity parameters determined from the absorption spectra were used to investigate the symmetry orientation of the Dy- ligand field environment. Various radiative parameters were determined using J-O parameters for different Dy3+ emission transitions.
Objective: Photoluminescence spectra exhibit emission bands in the blue, yellow and red regions. Stimulated emission cross section (σP E ) branching ratio (βexp), yellow to blue intensity (Y/B) ratio and Dy - O bond covalence were estimated from the luminescence spectra. The nature of the decay curves of 4F9/2 level of Dy3+ ions was analyzed.
Conclusion: Finally the effect of different alkaline earth metal oxide modifiers on the luminescence properties of PLZFB: Dy glass system was analyzed. Among the prepared glasses, PLSrZFB: Dy glass possesses higher values of AR, βr, σP E and η indicating its usefulness for the development of optical, display and LED devices in the visible region.
Keywords: Lead fluoroborate glass, alkaline earth oxide, optical absorption, photoluminescence, rareearth ion, emission.
Graphical Abstract
9
1