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Dynamic Reversible Full-Color Phosphorescence Afterglows from Stimuli-Responsive Carboxymethyl Chitosan Based

Yu Song Cai1, Zhengshuo Wang2, Yijing Cui1

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Marine-derived carboxymethyl chitosan enables efficient, tunable room-temperature phosphorescence. This breakthrough offers new possibilities for advanced materials in anti-counterfeiting and smart electronics.

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carboxymethyl chitosanfull‐color phosphorescence afterglowsluminescent fibersstimuli‐responsive luminescent materials

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Area of Science:

  • Materials Science
  • Organic Chemistry
  • Polymer Science

Background:

  • Organic stimuli-responsive persistent room-temperature phosphorescence (p-RTP) materials are crucial for applications like encryption, bioimaging, and sensing.
  • Developing efficient p-RTP systems with full-color tunability and multi-dimensional responsiveness, especially from nonconventional luminophores, is a significant challenge.

Purpose of the Study:

  • To develop a novel, efficient, and stimuli-responsive p-RTP system using nonconventional luminophores.
  • To achieve full-color tunability and multi-dimensional reversible responsiveness in p-RTP materials.

Main Methods:

  • Investigated marine-derived carboxymethyl chitosan (CMCS) for intrinsic photoluminescence (PL) and p-RTP properties.
  • Constructed a pyrenedicarboxylic acid salt-doped phosphorescence system utilizing CMCS.
  • Evaluated p-RTP characteristics including quantum yield, emission duration, and tunability via pH, delay time, and excitation wavelength.

Main Results:

  • CMCS demonstrated intrinsic excitation-tunable panchromatic PL (400-610 nm) and a record p-RTP quantum yield (10.1%) for nonconventional polymers.
  • The doped system exhibited efficient (8.8%), prolonged (515.1 ms), and dynamically tunable p-RTP (495-710 nm).
  • Achieved cyclable control of p-RTP through pH, delay time, and excitation wavelength, demonstrating multimode stimuli-responsiveness.

Conclusions:

  • Achieved efficient, multi-stimuli-responsive p-RTP by combining nonaromatic CMCS with aromatic chromophores, controlling molecular interactions and aggregation.
  • This approach overcomes limitations of conventional aromatic modification strategies for p-RTP development.
  • The developed system shows potential for versatile applications in anti-counterfeiting, encryption, information storage, and phosphorescent textiles.