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<p>Transparent wood engineering enables the transformation of natural wood into various optical materials. However, typical top-down strategies rely on lignin removal, which significantly reduces the near-infrared (NIR) selectivity of the resulting materials, making it challenging to develop wood-based NIR optical filters. Herein, we present a lignin-enrichment approach to fabricate highly NIR-selective optical filters directly from natural wood. By enriching the lignin content from 19.81% to 35.19%, we amplify its dual functionality in ultraviolet-visible (UV-Vis) light absorption and binding ability, increasing the NIR selectivity of wood after densification. The resulting wooden filters completely block light below 600 nm while achieving an NIR transmittance exceeding 80%, enabling them to harness 77.90% of solar NIR for phototherapy. This lignin-enrichment approach not only establishes a transformative strategy for designing NIR optical filters but also promotes the efficient utilization of natural wood and solar NIR energy.</p>

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A lignin-enrichment approach for processing natural wood into highly NIR-selective optical filters

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年11月25日

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  • Shixu Yu,
  • Yucheng Hu,
  • Guohua Miao,
  • Yimin Xie,
  • Sheng Chen,
  • Tingting You,
  • Feng Xu,
  • Qinghua Feng

摘要

Transparent wood engineering enables the transformation of natural wood into various optical materials. However, typical top-down strategies rely on lignin removal, which significantly reduces the near-infrared (NIR) selectivity of the resulting materials, making it challenging to develop wood-based NIR optical filters. Herein, we present a lignin-enrichment approach to fabricate highly NIR-selective optical filters directly from natural wood. By enriching the lignin content from 19.81% to 35.19%, we amplify its dual functionality in ultraviolet-visible (UV-Vis) light absorption and binding ability, increasing the NIR selectivity of wood after densification. The resulting wooden filters completely block light below 600 nm while achieving an NIR transmittance exceeding 80%, enabling them to harness 77.90% of solar NIR for phototherapy. This lignin-enrichment approach not only establishes a transformative strategy for designing NIR optical filters but also promotes the efficient utilization of natural wood and solar NIR energy.