Abstract
Improving the optical response of glass host with two or more strong network formers via suitable controlled of rare earth ions is the key issue in the fabrication of optical based glass for solid state lasers and light emitting devices. Hence, we report the Nd3+ concentration dependent on optical parameters such as absorption edge, optical band gap (direct and indirect) and Urbach’s energy of gadolinium borophospho-tellurite glasses with chemical composition of 10Gd2O + 30B2O3 + 20P2O5 + (40-)TeO2 + Nd2O3 (where 0.0 ≤ x ≤ 1.0 mol%). The glass samples were synthesized by convectional melt quenching method and characterized through X-Ray Diffraction (XRD) and Ultraviolet Visible Near-Infrared (UV-Vis-NIR) measurements. The amorphous nature of these glasses was confirmed by X-Ray diffraction pattern while the UV-Vis-NIR spectra revealed six absorption peaks corresponding to the transition from ground level 4I9/2 to the various excited state of Nd3+ ions. It was found that the investigated range of Nd3+ doping concentrations has a great influence on aforementioned parameters. The excellent optical features established in the present glass host suggest their potentiality for solid-state lasers and other photonic applications.
 Bulus, I. | Department of Physics, School of Sciences, Kaduna State College of Education Gidan waya, Kafanchan, Nigeria
Highlights
IntroductionDriven by the quest for practical and efficient solid-state lasers, neodymium (Nd3+) doped glasses have captured the attention of esteem material scientists, physicists, physical chemists and engineers in the search of novel glass hosts with optimized optical properties.Recently, passionate efforts have been focused on the synthesis and characterization of multi-component oxide glasses such as borophosphate (Marimuthu, 2016), sulfoborate (Dalhatu et al, 2016), borosulfophosphate (Kumar et al, 2012), borotellurite (Lakshminarayana et al, 2017) and borosilicate (Rao et al, 2014) glasses for various scientific and technological applications
Among the convectional multi-component glass families, borophospho-tellurite glass host has been chosen in this study because combination of B2O3, P2O5 and Te2O3 will enhance the physical and electrical properties and the UV and IR transmission abilities (Maheshvaran and Marimuthu, 2012, Gomes et al, 2017)
It can be seen that the value of the optical band gaps, direct and indirect are in the range of 2.476 – 2.078 and 2.304 – 1.529 eV, respectively close to the values obtained by previous researchers (Nurhafizah et al, 2016, Rao et al, 2014)
Summary
Driven by the quest for practical and efficient solid-state lasers, neodymium (Nd3+) doped glasses have captured the attention of esteem material scientists, physicists, physical chemists and engineers in the search of novel glass hosts with optimized optical properties.Recently, passionate efforts have been focused on the synthesis and characterization of multi-component oxide glasses such as borophosphate (Marimuthu, 2016), sulfoborate (Dalhatu et al, 2016), borosulfophosphate (Kumar et al, 2012), borotellurite (Lakshminarayana et al, 2017) and borosilicate (Rao et al, 2014) glasses for various scientific and technological applications. Among the convectional multi-component glass families, borophospho-tellurite glass host has been chosen in this study because combination of B2O3, P2O5 and Te2O3 will enhance the physical and electrical properties and the UV and IR transmission abilities (Maheshvaran and Marimuthu, 2012, Gomes et al, 2017). The presence of tellurite in a glass matrix containing B2O3 and P2O5 will decrease its hydroscopic nature which is of scientific and practical interest (Selvi et al, 2016). Addition of Gd2O into borophospho-tellurite glass network produces low rates of crystallization and increases the glass forming ability
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