• S Rai

Articles written in Bulletin of Materials Science

• Structural, optical and non-linear investigation of Eu3+: Al(NO$_3)_3$–SiO2 sol–gel glass

Optical absorption and fluorescence spectra of Eu3+ ions in Al(NO$_3)_3$–SiO2 sol–gel glass have been investigated using the Judd–Ofelt theory. JO intensity parameters (𝛺𝜆) and subsequent radiative properties for ${}^{5}D_{0} \rightarrow {}^{7}F_{1,2,4,6}$ transitions are determined. The lifetime (𝜏r) of ${}^{5}D_{0}$ state is computed and along with JO parameters are compared with their corresponding values in other glasses prepared by conventional technique. A structural analysis, using IR and XRD spectra and non-linear parametrization of the silica gel glass is carried out. The study reveals the glass to be a very good third order non-linear amorphous optical material.

• Effect of CdS nanoparticles on photoluminescence spectra of Tb3+ in sol–gel-derived silica glasses

CdS nanoparticles doped with Tb3+ were synthesized by sol–gel technique. The influence of CdS on the Tb3+ glass was studied by UV-Visible and luminescence spectroscopy. The luminescence intensity of the glasses increased significantly in the presence of CdS nanoparticles. Terbium ions excited into the ${}^{5}D_{3}$ level have a rich emission spectrum in the 400–700 nm range decaying to different ${}^{7}F_{J}$ levels. The intensity of violet and blue luminescence from ${}^{5}D_{3}$ level is highly dependent on Tb3+ concentration, on presence of CdS co-dopant and annealing conditions.

• # Bulletin of Materials Science

Volume 44, 2021
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Continuous Article Publishing mode

• # Dr Shanti Swarup Bhatnagar for Science and Technology

Posted on October 12, 2020

Prof. Subi Jacob George — Jawaharlal Nehru Centre for Advanced Scientific Research, Jakkur, Bengaluru
Chemical Sciences 2020