El-Amine Nouairi Mohammed, Freha Mohammed
University Mustapha Stambouli of Mascara, Mascara, Algeria.
Faculty of Sciences & Technology, Department of Science and Technology, Mascara, Algeria.
J Fluoresc. 2025 Sep 3. doi: 10.1007/s10895-025-04527-0.
Far-ultraviolet radiation poses significant health and environmental risks, so developing effective attenuation methods is essential. This study explores the potential of red dyes as optical filter materials which can block harmful far-ultraviolet radiation while allowing visible light to pass through. A series of red dyes including congo red, methyl red, neutral red, phenol red, and carminic acid were subjected to detailed spectroscopic analysis to evaluate their absorption capabilities in the far-ultraviolet range. Dyes with extended π-conjugation and azo groups, such as congo red and methyl red, showed strong absorption below 250 nm. Additionally, the presence of electron withdrawing groups and disrupted conjugation was found to enhance far-ultraviolet attenuation through hypsochromic shifts. Fluorescence analysis revealed excimer formation, which results from π-π stacking interactions. These results suggest that red dyes hold promise as effective components in optical filters for far-ultraviolet protection applications.
远紫外线辐射对健康和环境构成重大风险，因此开发有效的衰减方法至关重要。本研究探讨了红色染料作为光学滤光材料的潜力，这种材料可以阻挡有害的远紫外线辐射，同时让可见光透过。对一系列红色染料，包括刚果红、甲基红、中性红、酚红和胭脂红进行了详细的光谱分析，以评估它们在远紫外线范围内的吸收能力。具有扩展π共轭和偶氮基团的染料，如刚果红和甲基红，在250纳米以下显示出强烈的吸收。此外，发现吸电子基团的存在和共轭的破坏通过紫移增强了远紫外线的衰减。荧光分析揭示了准分子的形成，这是由π-π堆积相互作用导致的。这些结果表明，红色染料有望成为用于远紫外线防护应用的光学滤光器中的有效成分。
