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<p>A sustainable and low-cost method is presented for producing tunable luminescent glass composites by embedding unpurified phosphor powders recovered from spent fluorescent lamps into a soda–lime glass matrix obtained from recycled beer bottles. Without chemical purification or rare-earth separation, the composite preserves the optical activity of Ce<sup>3⁺</sup>, Tb<sup>3⁺</sup>, Eu<sup>2⁺</sup>, and Eu<sup>3⁺</sup> ions after high-temperature processing. The material displays strong photoluminescence with excitation-dependent emission that can be tuned across blue, green, red, and several white-light tones under ultraviolet excitation. Although low quantum yields would be expected for a silica-rich glass dominated by SiO₂, the composite reaches values of 46.18%, 21.78%, and 31.69% under excitation at 337 and 349&#xa0;nm, corresponding to cold white light, and at 394&#xa0;nm, corresponding to red emission. Optical characterization shows emission features consistent with rare-earth transitions, chromaticity coordinates overlapping those of commercial fluorescent sources, and color purity values above 50% for the red, green, and blue emissions. The white-light output presents color purities between 8 and 25%, which remain relatively low but are higher than the value of commercial lamps near 7%, indicating slight blue, green, or red tonalities depending on the excitation wavelength. These emissions show correlated color temperatures from about 5000 to 10,000&#xa0;K. Overall, the results demonstrate a low cost and scalable route for transforming post-consumer waste into functional optical materials with potential for sustainable lighting applications, supported by strong optical performance and high thermal stability up to 545&#xa0;°C.</p>

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Sustainable luminescent material for lighting applications from waste phosphors and recycled soda–lime glass

  • 期刊论文

  • 发表日期：

    2026年2月20日

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  • Juan Manuel Molina-Jiménez,
  • Ishia Denisse Méndez-Hernández,
  • Roberto Carlos Carrillo-Torres,
  • U. Caldiño,
  • Mario Enrique Álvarez-Ramos

摘要

A sustainable and low-cost method is presented for producing tunable luminescent glass composites by embedding unpurified phosphor powders recovered from spent fluorescent lamps into a soda–lime glass matrix obtained from recycled beer bottles. Without chemical purification or rare-earth separation, the composite preserves the optical activity of Ce3⁺, Tb3⁺, Eu2⁺, and Eu3⁺ ions after high-temperature processing. The material displays strong photoluminescence with excitation-dependent emission that can be tuned across blue, green, red, and several white-light tones under ultraviolet excitation. Although low quantum yields would be expected for a silica-rich glass dominated by SiO₂, the composite reaches values of 46.18%, 21.78%, and 31.69% under excitation at 337 and 349 nm, corresponding to cold white light, and at 394 nm, corresponding to red emission. Optical characterization shows emission features consistent with rare-earth transitions, chromaticity coordinates overlapping those of commercial fluorescent sources, and color purity values above 50% for the red, green, and blue emissions. The white-light output presents color purities between 8 and 25%, which remain relatively low but are higher than the value of commercial lamps near 7%, indicating slight blue, green, or red tonalities depending on the excitation wavelength. These emissions show correlated color temperatures from about 5000 to 10,000 K. Overall, the results demonstrate a low cost and scalable route for transforming post-consumer waste into functional optical materials with potential for sustainable lighting applications, supported by strong optical performance and high thermal stability up to 545 °C.