Thermal stability and Judd-Ofelt analysis of optical properties of Sm3+-doped sodium tellurite glasses

Abstract

Estimation of mean glandular dose for patients who undergo mammography and studying the factors affecting it AIP Conference Proceedings 1888, 020020 (2017) Abstract. Series of glasses based on (70-x) TeO2 -20Na2O -xSm2O3 (x=0, 0.3, 0.6, 1, 1.2, 1.5 mol%) have been prepared using melt-quenching technique. The nature of the glass has been confirmed using X-ray diffraction; it is found that the glass samples are amorphous in nature. The thermal stability of the glass has been determined by means of Differential Thermal Analysis (DTA). From the DTA curve, the glass transition temperature (Tg), crystallization temperature (Tc) and melting temperature (Tm) have been identified and thermal stability is also calculated. The absorption properties of these samples are obtained by using UV-Visible-NIR spectrometer, the recorded absorption spectra exhibit nine absorption transition bands peaks corresponding to the transitions from ground level 6 H5/2→ 6 P3/2, 4 I11/2, 6 F11/2, 6 F9/2, 6 F7/2, 6 F5/2, 6 F3/2, 6 H15/2 and 6 F1/2. The emission characteristic of this glass is characterized using Photoluminescence (PL) spectroscopy at excited wavelength 404 nm, the emission spectra consisted of four emission bands at 561.95 nm, 598.69 nm, 643.77 nm and 704.56 nm which were assigned as a transition 4 G5/2→ 6 H5/2, 6 H7/2, 6 H9/2 and 6 H11/2 respectively. From f-f intensity model the experimental oscillator strengths, fexp and theoretical oscillator strength fcal were calculated. Using Judd-Ofelt theory and fit process of least square, the phenomenological intensity parameters Ωλ (λ=2,4,6) were obtained, In order to evaluate potential applications of Sm 3+ ions in telluride glasses, the spectroscopic parameters: transition probability AR, branching ratio Br, radiative life time τr, emission pick cross section σλ for each band were calculated. The comparative studies with other Sm 3+ doped different glasses showed that present glasses could be a potential candidate for lasers.

Structural Properties of Lead Oxide-Doped Zinc Tellurite Glasses

“…The SEM micrographs of the glass samples, which Display in Figure 4, demonstrates the asymmetrical grain and various rod-type structures. SEM micrographs for all the glass samples have shown a homogeneous glassy phase (Mawlud et al, 2017b). Both dimensions show an irregular shape of grains and this structure can be observed for other glass samples.…”

Zinc Tellurite Glass System Incorporated with Erbium Oxide and Silver Oxide as Ultra-Broad (S+C+L) Bands Optical Communication

“…On the other hand, the differences in Ω 4 and Ω 6 are interrelated to the long-range effect of the glass host. In 2017, Mawlud and other co-authors [58] reported that Ω 2 is affected by the strength of the bond between the rare-earth ions and the ligand ions. There is a high possibility of the asymmetry and polarization of the local structure surrounding the rare earth ion causing this phenomenon.…”