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Judd–Ofelt analysis and physical properties of erbium modified cadmium lithium gadolinium silicate glasses

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Erbium doped 50SiO2 -30Li2O- 1Gd2O3- (19 − x) CdO and x Er2O3 glass system, where (0 ≤ x ≥ 2.5), mol%, has been prepared by the conventional melt quenching technique. The physical, structural and optical properties are explained by analyzing the data obtained from X-ray diffraction (XRD), Fourier transform infrared (FTIR), UV–Visible (UV–Vis-NIR) and photoluminescence results. X-ray powder diffraction patterns show broad peaks which conform glassy nature of the sample. FTIR spectroscopy reveals the presence of SiO4, CdO4 and Er–O vibration groups in the glass samples. The optical absorption spectra in the wavelength range of 200–2500 nm were measured and the optical band gaps, Urbach energy, Electronegativity (χ) Electron Polarizability (α°), and Optical basicity (˄) were determined. The optical absorption spectra of Er3+ ions in these glasses show eleven bands and are assigned to the transitions from ground state to excited levels. It was found that the optical band gap increases from 3.19 to 3.51 eV with the increase in Er2O3 concentration. The strong sharp peak belongs to Er+3 emission is investigated in photoluminescence spectra at ordinary condition (1 atm. and at room temperature). It excites by wavelength of 385 nm and gives pale green color at 559 nm. Judd–Ofelt theory has been used to analyze the spectra arising from erbium ions doped 50 SiO2 -30 Li2O- 1Gd2O3- (19 − x) CdO and x Er2O3. The intensity parameters Ω2,4,6 of the present complex and lifetimes of selected levels are theoretically calculated as well.

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The authors are grateful to Al-Azhar University for supporting with the experimental measurements. In addition, the authors thank the Deanship of Scientific Research at King Khalid University (KKU) for funding this research project, Number: (R.G.P2./22/40) under research center for advanced material science.

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Shaaban, K., Abdel Wahab, E.A., El-Maaref, A.A. et al. Judd–Ofelt analysis and physical properties of erbium modified cadmium lithium gadolinium silicate glasses. J Mater Sci: Mater Electron (2020). https://doi.org/10.1007/s10854-020-03065-8

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