Spectroscopic properties of Sm3+ ions in phosphate and fluorophosphate glasses

• Published in: Journal of non-crystalline solids Vol. 365; pp. 85 - 92
• Main Authors: Vijaya, R., Venkatramu, V., Babu, P., Jayasankar, C.K., Rodríguez-Mendoza, U.R., Lavín, V.
• Format: Journal Article
• Language: English
• Published: Oxford Elsevier B.V 01.04.2013; Elsevier
• Subjects: Condensed matter: electronic structure, electrical, magnetic, and optical properties; Condensed matter: structure, mechanical and thermal properties; Cross-disciplinary physics: materials science; rheology; Diffusion; Diffusion in solids; Energy storage; Exact sciences and technology; Fluorides; Glasses; Glasses (including metallic glasses); Luminescence; Materials science; Optical properties and condensed-matter spectroscopy and other interactions of matter with particles and radiation; Photoluminescence; Physics; Specific materials; Stimulated emission; Transport properties of condensed matter (nonelectronic); Glasses; Fluorides; Diffusion; Luminescence; Energy storage; Phosphates; Radiative transition; Dipole dipole interaction; Cross section; Doping; Glass; Radiative lifetimes; Branching ratio; Lifetime; Stimulated emission; Fluorescent material; Optical properties; Oscillator strengths; Cross sections; Energy transfer
• ISSN: 0022-3093; 1873-4812
• DOI: 10.1016/j.jnoncrysol.2013.01.030

Spectroscopic properties of Sm3+-doped phosphate and fluorophosphate glasses of the composition (60−x/2) P2O5+15 K2O+(15−x/2) SrO+10 Al2O3+x Sm2O3 (PKSASm) and (54−x/2) P2O5+14 K2O+10 KF+(13−x/2) SrO+9 Al2O3+x Sm2O3 (PKFSASm), where x=0.1, 0.5, 1.0, 2.0, 4.0 and 6.0mol%, have been investigated. The oscillator strengths and the intensity parameters (Ω2, Ω4 and Ω6) have been determined using the Judd–Oflet theory, which in turn is used to predict the radiative transition probability (AR), radiative lifetime (τR) and branching ratios for the fluorescent 4G5/2 level. The higher stimulated emission cross-sections, 12.27×10−22 and 14.12×10−22cm2 have been observed for the 4G5/2→6H9/2 transition of PKSASm10 and PKFSASm10, respectively. The non-exponential nature of the decay curves of the 4G5/2 level increases with increase in Sm3+ ion concentration accompanied by decrease in lifetime. The non-exponential decay curves have been best fitted to the generalized Yokota–Tanimoto model indicating that the energy transfer among optically active ions is through dipole–dipole interaction. ► Sm3+-doped phosphate and fluorophosphate glasses have been prepared and analyzed. ► Intense reddish-orange emission under 476.5nm excitation has been observed. ► Non-exponential decay rates revealed the presence of dipole–dipole interactions. ► These glasses may be used for the development of LEDs in optical communication.