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<p>In the system (85-x) NaH<sub>2</sub>PO<sub>4</sub> + 5 (B<sub>4</sub>Na<sub>2</sub>O<sub>7</sub>) + 10 (PbO<sub>2</sub>) + x Cr<sub>2</sub>O<sub>3</sub>, where x = 0, 0.1, 0.2, 0.3, 0.5, and 0.7&#xa0;mol%, chromium oxide Cr<sub>2</sub>O<sub>3</sub> doped glasses were prepared using the rapid-quenching technique. The glasses were then examined using X-ray diffraction, UV-Vis spectroscopy, photoluminescence (PL), fluorescence lifetime, FT-IR spectroscopy, and CIE chromaticity. The glass density increases as the Cr<sub>2</sub>O<sub>3</sub> concentration increase, while the molar volume decreased. The analysis of the X-ray data indicates that the glass samples are amorphous. Trivalent Cr<sup>3+</sup> and hexavalent Cr<sup>6+</sup> are the two possible oxidation states for Cr ions, as indicated by the two peak absorption bands at 448 and 637&#xa0;nm found by optical absorption spectroscopy. The produced glass samples exhibit a reduction in both direct and indirect optical energy gaps, measuring 3.67–3.43&#xa0;eV and 3.74–3.56&#xa0;eV respectively. The occurrence of both luminescence bands shows that both octahedral sites are present, and that photoluminescence emission varies with concentration, from 689 to 714&#xa0;nm. About 30 µs was the fluorescence lifetime of the lead-sodium Boro phosphate glass doped with 0.5&#xa0;mol% of Cr<sup>3+</sup> ions. Lead-sodium boro-phosphate vibration characteristics suggest that metaphosphate groups in the form of rings or chains, along with traces of pyrophosphate groups, may be present in glasses containing boro-phosphate. Chromaticity tests showed that glass might be used as a green light medium in displays and visible light sources. This study may be useful guidelines to develop some photonic devices based on lead-sodium boro-phosphate glass activated with Cr<sup>3+</sup> ions.</p>

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Spectral properties and photoluminescence of Cr3+ Ions doped Lead-Sodium Boro-Phosphate glass for optical applications

  • 期刊论文

  • 发表日期：

    2025年9月26日

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  • Hamdan A. S. Al-Shamiri

摘要

In the system (85-x) NaH2PO4 + 5 (B4Na2O7) + 10 (PbO2) + x Cr2O3, where x = 0, 0.1, 0.2, 0.3, 0.5, and 0.7 mol%, chromium oxide Cr2O3 doped glasses were prepared using the rapid-quenching technique. The glasses were then examined using X-ray diffraction, UV-Vis spectroscopy, photoluminescence (PL), fluorescence lifetime, FT-IR spectroscopy, and CIE chromaticity. The glass density increases as the Cr2O3 concentration increase, while the molar volume decreased. The analysis of the X-ray data indicates that the glass samples are amorphous. Trivalent Cr3+ and hexavalent Cr6+ are the two possible oxidation states for Cr ions, as indicated by the two peak absorption bands at 448 and 637 nm found by optical absorption spectroscopy. The produced glass samples exhibit a reduction in both direct and indirect optical energy gaps, measuring 3.67–3.43 eV and 3.74–3.56 eV respectively. The occurrence of both luminescence bands shows that both octahedral sites are present, and that photoluminescence emission varies with concentration, from 689 to 714 nm. About 30 µs was the fluorescence lifetime of the lead-sodium Boro phosphate glass doped with 0.5 mol% of Cr3+ ions. Lead-sodium boro-phosphate vibration characteristics suggest that metaphosphate groups in the form of rings or chains, along with traces of pyrophosphate groups, may be present in glasses containing boro-phosphate. Chromaticity tests showed that glass might be used as a green light medium in displays and visible light sources. This study may be useful guidelines to develop some photonic devices based on lead-sodium boro-phosphate glass activated with Cr3+ ions.