Visible and mid-infrared spectral emissions and radiative rates calculations of Tm3+ doped BBLC glass

A A El-Maaref; E A Abdel Wahab; Kh S Shaaban; M Abdelawwad; M S I Koubisy; J Börcsök; El Sayed Yousef

doi:10.1016/j.saa.2020.118774

Visible and mid-infrared spectral emissions and radiative rates calculations of Tm³⁺ doped BBLC glass

Spectrochim Acta A Mol Biomol Spectrosc. 2020 Dec 5:242:118774. doi: 10.1016/j.saa.2020.118774. Epub 2020 Aug 5.

Authors

A A El-Maaref¹, E A Abdel Wahab², Kh S Shaaban³, M Abdelawwad⁴, M S I Koubisy⁵, J Börcsök⁶, El Sayed Yousef⁷

Affiliations

¹ Physics Department, College of Science, Jouf University, P.O. Box 2014, Skaka, Saudi Arabia; Physics Department, Faculty of Science, Al-Azhar University, 71524 Assiut, Egypt. Electronic address: ahmed.maaref@azhar.edu.eg.
² Physics Department, Faculty of Science, Al-Azhar University, 71524 Assiut, Egypt.
³ Department of Chemistry, Faculty of Science, Al-Azhar University, 71524 Assiut, Egypt.
⁴ Physics Department, Faculty of Science, Al-Azhar University, 71524 Assiut, Egypt; Faculty of Electrical Engineering and Computer Science, University of Kassel, Germany.
⁵ Institute of Physics and Technology, Ural Federal University, Mira Street 19, 620002 Yekaterinburg, Russia; Physics Department, Faculty of Science, Al-Azhar University, 71524 Assiut, Egypt.
⁶ Faculty of Electrical Engineering and Computer Science, University of Kassel, Germany.
⁷ Department of Physics, Faculty of Sciences, King Khalid University, Abha, P.O. Box 9004, Saudi Arabia; Research Center for Advanced Materials Science (RCAMS), King Khalid University, Abha 61413, P.O. Box 9004, Saudi Arabia.

PMID: 32801021
DOI: 10.1016/j.saa.2020.118774

Abstract

Quaternary glasses with the composition 75Li₂B₂O₇-(15-x)BaO-10CdO-xTm₂O₃ (BBLC) (0 ≤ x ≤ 2 mol %) have been prepared by melt-quenching method. The structure changes, the absorption coefficient of OH^- and the maximum phonon energy of these glasses are studied by FT-IR spectra. Optical and emission properties of Tm³⁺ doped BBLC glasses have been investigated at room temperature. The optical band gap (E_opt), dispersion parameters and Urbach's energy (Eu) of the prepared samples have been estimated. Judd-Ofelt theory has been applied to obtain the radiative rates and optical intensity parameters. Oscillator strengths, radiative lifetimes, and branching ratio of different transitions have been calculated. Derived emission cross sections of the emission transitions in the visible range are determined. A strong emission is observed at 455 nm, this line is attributed to ¹D₂→³F₄. Spectral line in the blue region has been observed at wavelength of 515 nm, as well. Two central wavelengths of 1.2 μm and 1.8 μm, which are located in the short- and mid- wave IR spectral regions, are analyzed. These emissions are attributed to the transitions ³H₅→³H₆ and ³F₄→³H₆, respectively.

Keywords: Judd-Ofelt method; Optical intensity; Radiative rates; Rare earth ions; Vis-mid-infrared.