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<p>Developing eco-friendly natural polymer-based room-temperature phosphorescence (RTP) materials with color-tunability and flexibility remains a crucial yet challenging task. Here, we fabricate a sustainable multicolor-tunable and flexible RTP system based on sodium carboxymethyl cellulose (NaCMC). <i>p</i>-Aminobenzoic acid (PABA) is doped into NaCMC matrix to facilely construct NaCMC/PABA composites. The rigid hydrogen-bonding networks formed between NaCMC and PABA significantly suppress molecular vibration and non-radiative decay, resulting in an ultralong RTP lifetime of up to 1263 ms and a bright blue afterglow lasting 11 s. By incorporating commercial fluorescent dyes fluorescein (FL), calcein (CAL), and lisamine rhodamine B (LRB) as energy acceptors into the NaCMC/PABA donor matrix, multicolor long-afterglow emissions are realized in the long-wavelength region <i>via</i> triplet-to-singlet Förster resonance energy transfer (TS-FRET). Moreover, large-area, multicolor and flexible NaCMC-based RTP films with excellent mechanical properties are conveniently fabricated by a doping-coating-drying approach. The developed multicolor and flexible NaCMC-based RTP materials are successfully used for advanced information encryption. This work provides a direction for developing sustainable, multicolor-tunable, and flexible natural polymer-based RTP materials.</p>

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Multicolor-tunable and Flexible Sodium Carboxymethyl Cellulose-based Ultralong Room-temperature Phosphorescence Materials for Advanced Information Encryption

  • 期刊论文

  • 发表日期：

    2026年3月3日

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  • Tian-Yu Li,
  • Yu-Tong Zhou,
  • Zhi-Hui Wang,
  • Fa-Rong Tao,
  • Li-Ping Wang,
  • Guang Li

摘要

Developing eco-friendly natural polymer-based room-temperature phosphorescence (RTP) materials with color-tunability and flexibility remains a crucial yet challenging task. Here, we fabricate a sustainable multicolor-tunable and flexible RTP system based on sodium carboxymethyl cellulose (NaCMC). p-Aminobenzoic acid (PABA) is doped into NaCMC matrix to facilely construct NaCMC/PABA composites. The rigid hydrogen-bonding networks formed between NaCMC and PABA significantly suppress molecular vibration and non-radiative decay, resulting in an ultralong RTP lifetime of up to 1263 ms and a bright blue afterglow lasting 11 s. By incorporating commercial fluorescent dyes fluorescein (FL), calcein (CAL), and lisamine rhodamine B (LRB) as energy acceptors into the NaCMC/PABA donor matrix, multicolor long-afterglow emissions are realized in the long-wavelength region via triplet-to-singlet Förster resonance energy transfer (TS-FRET). Moreover, large-area, multicolor and flexible NaCMC-based RTP films with excellent mechanical properties are conveniently fabricated by a doping-coating-drying approach. The developed multicolor and flexible NaCMC-based RTP materials are successfully used for advanced information encryption. This work provides a direction for developing sustainable, multicolor-tunable, and flexible natural polymer-based RTP materials.