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<p>The current study focuses on the spectroscopic examination of Dy<sub>2</sub>O<sub>3</sub>-doped 45PbO-(5−x) Bi<sub>2</sub>O<sub>3</sub>-50SiO<sub>2</sub>-xDy<sub>2</sub>O<sub>3</sub> glasses (x = 0.00, 0.1, 0.5, 1.0, and 2.0&#xa0;mol.%) that were made using the traditional melt quenching method. Optical absorption, differential thermal analysis (DTA), Fourier transform infrared (FTIR) spectroscopy, x-ray diffraction (XRD), and luminescence tests were used to characterize the glass samples. XRD revealed the amorphous nature of the glass sample. According to the DTA results, the glasses offer a high potential for fiber drawing due to their chemical and thermal stability in practical applications. The FTIR spectra of the generated glasses confirmed the bending vibrations of Si-O-Si and PbO<sub>4</sub> groups, the symmetric bending vibrations of Si-O-Pb bonds, and the vibrations of the Bi-O-Bi bands of BiO<sub>6</sub> units. According to the optical spectra, the cutoff wavelength values (361–341&#xa0;nm) and the optical band gap values (3.433–3.588&#xa0;eV) fluctuate inversely. Three emission bands can be seen in the emission spectra of these glasses at 482&#xa0;nm, 574&#xa0;nm, and 665&#xa0;nm. The transitions of <sup>4</sup>F<sub>9/2</sub> → <sup>6</sup>H<sub>15/2</sub>, <sup>4</sup>F<sub>9/2</sub> → <sup>6</sup>H<sub>13/2</sub>, and <sup>4</sup>F<sub>9/2</sub> → <sup>6</sup>H1<sub>1/2</sub> with Dy<sup>3+</sup> ion concentrations are responsible for these bands. The prepared glasses are suitable for white light-emitting diodes (W-LEDs), as shown by the coordinates in the white light zone of the CIE chromaticity map. The calculated correlated color temperature (CCT) values and CIE color coordinates exhibit good agreement with daylight, suggesting that they may be used with W-LEDs.</p>

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Spectroscopic Studies of Dy3+-Doped PbO-Bi2O3-SiO2 Glasses via the Melt Quenching Method

  • 期刊论文

  • 发表日期：

    2025年9月1日

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  • Nakka Praveenkumar,
  • D. V. Krishna Reddy

摘要

The current study focuses on the spectroscopic examination of Dy2O3-doped 45PbO-(5−x) Bi2O3-50SiO2-xDy2O3 glasses (x = 0.00, 0.1, 0.5, 1.0, and 2.0 mol.%) that were made using the traditional melt quenching method. Optical absorption, differential thermal analysis (DTA), Fourier transform infrared (FTIR) spectroscopy, x-ray diffraction (XRD), and luminescence tests were used to characterize the glass samples. XRD revealed the amorphous nature of the glass sample. According to the DTA results, the glasses offer a high potential for fiber drawing due to their chemical and thermal stability in practical applications. The FTIR spectra of the generated glasses confirmed the bending vibrations of Si-O-Si and PbO4 groups, the symmetric bending vibrations of Si-O-Pb bonds, and the vibrations of the Bi-O-Bi bands of BiO6 units. According to the optical spectra, the cutoff wavelength values (361–341 nm) and the optical band gap values (3.433–3.588 eV) fluctuate inversely. Three emission bands can be seen in the emission spectra of these glasses at 482 nm, 574 nm, and 665 nm. The transitions of 4F9/2 → 6H15/2, 4F9/2 → 6H13/2, and 4F9/2 → 6H11/2 with Dy3+ ion concentrations are responsible for these bands. The prepared glasses are suitable for white light-emitting diodes (W-LEDs), as shown by the coordinates in the white light zone of the CIE chromaticity map. The calculated correlated color temperature (CCT) values and CIE color coordinates exhibit good agreement with daylight, suggesting that they may be used with W-LEDs.