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<p>The present investigation focuses on the effects arising from the concentration of the bismuth oxide in the Dy<sup>3+</sup> doped boro-tellurite glass with the composition (59−x)B<sub>2</sub>O<sub>3</sub> + 20TeO<sub>2</sub> + 10ZnF + 10BaO + xBi<sub>2</sub>O<sub>3</sub> + 1Dy<sub>2</sub>O<sub>3</sub> (where x = 0, 5, 10, 15, 20 in wt%). These samples were fabricated, adopting the conventional melt-quench technique and several characterization techniques were carried out. XRD confirmed the amorphous nature of the prepared sample. The absorption spectra were employed to scrutinize the Judd-Ofelt intensity parameters (Ω<sub>2</sub>, Ω<sub>4</sub>, Ω<sub>6</sub>), nephelauxetic ratios (β); and the bonding parameters (δ). The bonding parameter reveals the covalent nature of Dy-O bonds. The JO intensity parameter obeys the following trend Ω<sub>2</sub> &gt; Ω<sub>4</sub> &gt; Ω<sub>6</sub>, the higher value of Ω<sub>2</sub> further confirms the covalent nature. Photoluminescence studies were used to evaluate the radiative parameters and CIE analysis. The glass zero bismuth (BTBaZfDy: Bi<sub>0</sub>) exhibited the highest stimulated emission cross section, branching ratio (β<sub>exp</sub>), and transition possibility (A) about the <sup>4</sup>F<sub>9/2</sub> →<sup>6</sup>H<sub>13/2</sub> transition, which specifies its aptness for lasing applications. The decay lifetime of the <sup>4</sup>F<sub>9/2</sub> excited state exhibits a non-exponential behavior. The quantum efficiency was evaluated from the calculated and experimental lifetime, and the BTBaZfDy: Bi<sub>0</sub> possess the highest quantum efficiency of about 65.6%. The color chromaticity coordinates (x, y) have been evaluated from the PL spectra, and all the glasses secure the yellowish-orange region. The color purity of BTBaZfDy: Bi<sub>0</sub> and BTBaZfDy: Bi<sub>20</sub> are found to be 0.487. Overall, the study identifies optimal compositions for w-LEDs.</p>

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Unveiling the impact of Dy3+ ions incorporated bismuth modified boro-tellurite glasses designed for optical applications

  • 期刊论文

  • 发表日期：

    2025年9月26日

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  • D. Keerthana,
  • S. Arul Raja Sekaran,
  • K. A. Naseer,
  • Imed Boukhris,
  • K. Marimuthu

摘要

The present investigation focuses on the effects arising from the concentration of the bismuth oxide in the Dy3+ doped boro-tellurite glass with the composition (59−x)B2O3 + 20TeO2 + 10ZnF + 10BaO + xBi2O3 + 1Dy2O3 (where x = 0, 5, 10, 15, 20 in wt%). These samples were fabricated, adopting the conventional melt-quench technique and several characterization techniques were carried out. XRD confirmed the amorphous nature of the prepared sample. The absorption spectra were employed to scrutinize the Judd-Ofelt intensity parameters (Ω2, Ω4, Ω6), nephelauxetic ratios (β); and the bonding parameters (δ). The bonding parameter reveals the covalent nature of Dy-O bonds. The JO intensity parameter obeys the following trend Ω2 > Ω4 > Ω6, the higher value of Ω2 further confirms the covalent nature. Photoluminescence studies were used to evaluate the radiative parameters and CIE analysis. The glass zero bismuth (BTBaZfDy: Bi0) exhibited the highest stimulated emission cross section, branching ratio (βexp), and transition possibility (A) about the 4F9/2 →6H13/2 transition, which specifies its aptness for lasing applications. The decay lifetime of the 4F9/2 excited state exhibits a non-exponential behavior. The quantum efficiency was evaluated from the calculated and experimental lifetime, and the BTBaZfDy: Bi0 possess the highest quantum efficiency of about 65.6%. The color chromaticity coordinates (x, y) have been evaluated from the PL spectra, and all the glasses secure the yellowish-orange region. The color purity of BTBaZfDy: Bi0 and BTBaZfDy: Bi20 are found to be 0.487. Overall, the study identifies optimal compositions for w-LEDs.