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Photoactivated room temperature phosphorescence from lignin.

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Researchers developed sustainable room-temperature phosphorescent materials by linking lignin and polylactic acid. UV light activates phosphorescence by consuming oxygen, enabling applications like anti-counterfeiting.

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Area of Science:

  • Materials Science
  • Photochemistry
  • Polymer Chemistry

Background:

  • Sustainable photoactivated room-temperature phosphorescent materials are highly desirable but challenging to create.
  • Lignin and polylactic acid are abundant, biodegradable polymers with potential for advanced material applications.

Purpose of the Study:

  • To develop a novel photoactivated room-temperature phosphorescent material using lignin and polylactic acid.
  • To investigate the mechanism of phosphorescence activation and quenching.
  • To demonstrate the material's utility in anti-counterfeiting and information storage.

Main Methods:

  • Covalent attachment of lignin (chromophore) to a polylactic acid (matrix) polymer.
  • Characterization of phosphorescence properties under UV irradiation.
  • Investigation of oxygen quenching and recovery dynamics.
  • Application testing for anti-counterfeiting logos and data recording.

Main Results:

  • The developed material exhibits photoactivated room-temperature phosphorescence, switching on under UV light.
  • Phosphorescence lifetime significantly increased from 3.0 ms to 221.1 ms after 20 s of UV activation due to oxygen consumption.
  • Phosphorescence is reversible, quenching upon oxygen diffusion back into the material in ambient air.
  • Successful demonstration as a smart anti-counterfeiting logo for medicine bottles and for information recording.

Conclusions:

  • A sustainable, photoactivated room-temperature phosphorescent material was successfully synthesized by combining lignin and polylactic acid.
  • The material's phosphorescence is reversibly controlled by oxygen concentration, activated by UV light.
  • This material shows promise for advanced applications in security, authentication, and data storage.