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Photoluminescence: Applications01:14

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Photoluminescence offers a wide range of applications due to its inherent sensitivity and selectivity. This technique allows for both direct and indirect analyses of the analyte. Direct quantitative analysis is possible when the analyte exhibits a favorable quantum yield for fluorescence or phosphorescence. However, an indirect analysis may be feasible if the analyte is not fluorescent or phosphorescent, or if the quantum yield is unfavorable. Indirect methods include reacting the analyte with...
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Bio-Based Thermoplastic Room Temperature Phosphorescent Materials with Closed-Loop Recyclability.

Yuanyuan Qian1, Yingxiang Zhai2, Meng Li1

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Summary

Researchers developed recyclable, thermoplastic room temperature phosphorescent (RTP) materials from natural cellulose and thioctic acid. These Poly(TA)/Cell materials exhibit tunable emission and can be recycled, offering a sustainable solution for advanced applications like information encryption.

Keywords:
bio‐based polymerclosed‐loop recyclabilityroom‐temperature phosphorescencethermoplastic processability

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Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Sustainable Materials

Background:

  • Developing thermoplastic room temperature phosphorescent (RTP) materials from natural sources with closed-loop recyclability is challenging.
  • Existing phosphorescent materials often lack recyclability or are derived from non-renewable resources.

Purpose of the Study:

  • To create novel, thermoplastic RTP materials from natural cellulose and thioctic acid.
  • To achieve closed-loop recyclability for the developed phosphorescent materials.
  • To explore the potential applications of these materials in areas like information encryption.

Main Methods:

  • Thermally polymerizing thioctic acid in the presence of cellulose to form Poly(TA)/Cell.
  • Investigating hydrogen bonding interactions between polymerized thioctic acid (poly(TA)) and cellulose nanofibers (CNF).
  • Incorporating Rhodamine B (RhB) for red afterglow emission via energy transfer.
  • Evaluating thermoplastic moldability and alkali-induced recyclability.

Main Results:

  • Successfully synthesized Poly(TA)/Cell, a thermoplastic material exhibiting humidity- and excitation-sensitive green RTP emission.
  • Achieved red afterglow emission by integrating RhB through energy transfer.
  • Demonstrated excellent thermoplastic moldability into flexible shapes without compromising RTP performance.
  • Reported high recycling yields: 92.3% for thioctic acid and 81.5% for cellulose.
  • Fabricated materials for information encryption as a proof-of-concept.

Conclusions:

  • Poly(TA)/Cell offers a sustainable and recyclable approach to thermoplastic RTP materials.
  • The material's tunable emission and recyclability make it promising for advanced optical applications.
  • The developed material demonstrates potential for secure information encryption technologies.