Judd–Ofelt analysis of spectroscopic properties of Sm3+ doped sodium tellurite glasses co-doped with Yb3

• Published in: Journal of luminescence Vol. 147; pp. 90 - 96
• Main Authors: Nawaz, Fakhra, Sahar, M.R., Ghoshal, S.K., Awang, Asmahani, Amjad, R.J.
• Format: Journal Article
• Language: English
• Published: Amsterdam Elsevier B.V 01.03.2014; Elsevier
• Subjects: Absorption spectra; Bandwidth; Condensed matter: electronic structure, electrical, magnetic, and optical properties; Exact sciences and technology; Gain; Glass; Judd–Ofelt parameters; Luminescence; Nephelauxetic effect; Optical absorption; Optical constants: refractive index, complex dielectric constant, absorption, reflection and transmission coefficients, emissivity; Optical properties and condensed-matter spectroscopy and other interactions of matter with particles and radiation; Optical properties of bulk materials and thin films; Physics; Sodium; Spectroscopy; Stimulated emission; Tellurite glasses; Tellurite glasses; Nephelauxetic effect; Judd–Ofelt parameters; Optical absorption; Luminescence; Transition probabilities; Doping; Judd-Ofelt theory; Liquid state quenching; XRD; Radiative lifetimes; Excited states; Judd-Ofelt parameters; Phenomenological model; Branching ratio; Tellurite glass; Wide band; Sodium; Emission spectra; Excitation; Absorption spectra; Codoping
• ISSN: 0022-2313; 1872-7883
• DOI: 10.1016/j.jlumin.2013.10.049

A spectroscopic Judd–Ofelt investigation of co-doped sodium tellurite glasses is a key issue in lasers. Sm3+-doped glasses co-doped with various Yb3+ concentrations have been prepared by the melt quenching technique. These glasses have been characterized using XRD, optical absorption and luminescence techniques at room temperature. The amorphous nature of glasses has been confirmed by XRD spectra. The optical absorption spectra exhibited seven absorption peaks corresponding to the transition from ground level 6H5/2 to the various excited state of Sm3+ ions. The broad absorption band in the range of ~870–1040nm due to the large contribution of the absorption from 2F7/2→2F5/2 transition of Yb3+ ion was also observed. Judd–Ofelt theory have been applied to absorption intensities of Sm3+ transitions to determine the phenomenological intensity parameters, Ωλ (λ=2, 4 and 6). Emission spectra consisted of four emission bands 4G5/2→6H5/2, 6H7/2, 6H9/2 and 6H11/2. The J–O parameters have been employed to predict various radiative properties such as transition probability (AR), radiative lifetime (τf), branching ratio (βR), effective bandwidth (λeff), stimulated emission cross-section σ(λp), gain bandwidth and optical gain of trivalent samarium ion in 4G5/2 excitation level. The maximum values of stimulated emission cross section, gain bandwidth and optical gain were 23.09×10–22, 28.54×10–28cm3 and 12.51×10–25, respectively, corresponding to 4G5/2→6H9/2 transition in present glasses. The comparative studies with other Sm3+ doped different glasses showed that present glasses could be a potential candidate for lasers and broadband amplifiers. •A series of co-doped sodium tellurite glasses were synthesized by melt quenching technique.•Seven absorption peaks of Sm3+ ions and one peak due to superposition of Sm3+: 6H5/2→6F11/2 and Yb3+: 2F7/2→2F5/2 transitions are observed.•The intensities of HSTs transitions slightly vary with the increase of Yb3+ concentration.•The estimated band gap values lie in the range of 2.73–2.91eV.•The intensity of all emission bands quenched with Yb2O3 content due to cross-relaxation energy transfer mechanism from Sm3+ ion to neighboring Yb3+ ions.