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<p>A novel series of Fe<sup>3+</sup> doped mixed alkali zirconia-borate glasses with the composition 60B<sub>2</sub>O<sub>3</sub>–25Na<sub>2</sub>O–10Li<sub>2</sub>O–(5 − x)ZrO<sub>2</sub>–xFe<sub>2</sub>O<sub>3</sub> (x = 0–1&#xa0;mol%) were synthesized using the melt-quenching technique. The novelty of this work lies in combining the structural modifications with enhanced optical properties and orange-red luminescence in Fe<sup>3+</sup> doped mixed alkali zirconia-borate glasses for warm photonic applications. X-ray diffraction confirmed the non-crystalline nature of glass, while SEM images and EDS spectra were utilised for morphological and elemental analysis. The density of the glasses decreased from 2.4197 to 2.4168&#xa0;g cm<sup>−3</sup> before gradually increasing to 2.4324&#xa0;g cm<sup>−3</sup>. FTIR and Raman spectral studies showed the formation of non-bridging orthoborate units from pentaborate and di-pentaborate units. The optical absorption band at 450&#xa0;nm is associated with the Fe<sup>3+</sup> transition <sup>6</sup>A<sub>1g</sub> (<sup>6</sup>S) → <sup>4</sup>A<sub>1g</sub> (<sup>4</sup>G); <sup>4</sup>E<sub>g</sub> (<sup>4</sup>G). The decrease in direct bandgap from 3.90 to 3.10&#xa0;eV and indirect bandgap from 3.44 to 2.77&#xa0;eV, along with an increase in Urbach energy from 0.245 to 0.273&#xa0;eV, indicates the disorder in structure. An increase in refractive index leads to an increase in third-order susceptibility and nonlinear refractive index. The photoluminescence spectra exhibited orange-red emission at (<sup>4</sup>T<sub>2g</sub>(<sup>4</sup>G) → <sup>6</sup>A<sub>1g</sub>(<sup>6</sup>S)) with 550&#xa0;nm, 560&#xa0;nm and 570&#xa0;nm excitation wavelengths. The CIE chromaticity and CCT values show that Fe<sup>3+</sup> doped glasses are suitable for warm-emitting orange-red photonic applications.</p>

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Structural, optical and luminescence properties of Fe3+-doped mixed alkali zirconia-borate glasses for warm orange-red photonic applications

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  • 发表日期：

    2026年3月26日

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  • D. Vinay,
  • C. Devaraja,
  • Utpal Deka,
  • R. S. Gedam

摘要

A novel series of Fe3+ doped mixed alkali zirconia-borate glasses with the composition 60B2O3–25Na2O–10Li2O–(5 − x)ZrO2–xFe2O3 (x = 0–1 mol%) were synthesized using the melt-quenching technique. The novelty of this work lies in combining the structural modifications with enhanced optical properties and orange-red luminescence in Fe3+ doped mixed alkali zirconia-borate glasses for warm photonic applications. X-ray diffraction confirmed the non-crystalline nature of glass, while SEM images and EDS spectra were utilised for morphological and elemental analysis. The density of the glasses decreased from 2.4197 to 2.4168 g cm−3 before gradually increasing to 2.4324 g cm−3. FTIR and Raman spectral studies showed the formation of non-bridging orthoborate units from pentaborate and di-pentaborate units. The optical absorption band at 450 nm is associated with the Fe3+ transition 6A1g (6S) → 4A1g (4G); 4Eg (4G). The decrease in direct bandgap from 3.90 to 3.10 eV and indirect bandgap from 3.44 to 2.77 eV, along with an increase in Urbach energy from 0.245 to 0.273 eV, indicates the disorder in structure. An increase in refractive index leads to an increase in third-order susceptibility and nonlinear refractive index. The photoluminescence spectra exhibited orange-red emission at (4T2g(4G) → 6A1g(6S)) with 550 nm, 560 nm and 570 nm excitation wavelengths. The CIE chromaticity and CCT values show that Fe3+ doped glasses are suitable for warm-emitting orange-red photonic applications.