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Ultralong persistent luminescence from carbon dots.

Seunghyup Yoo1, Youngjin Song2, Sangin Hahn2

  • 1School of Electrical Engineering, Korea Advanced Institute of Science and Technology (KAIST), Daejeon, 34141, Republic of Korea. syoo_ee@kaist.ac.kr.

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Summary

Hour-level persistent luminescence was achieved using carbon dots within cyanuric acid. This rare-earth-metal-free method offers a novel route to ultralong persistent luminescence materials.

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Photophysics

Background:

  • Persistent luminescence (PL) materials store energy and emit light over extended periods.
  • Traditional PL materials often rely on rare-earth elements, which can be costly and environmentally concerning.
  • Developing rare-earth-metal-free alternatives for ultralong PL is a significant research challenge.

Purpose of the Study:

  • To develop a novel, rare-earth-metal-free material exhibiting hour-level persistent luminescence.
  • To investigate the potential of carbon dots (CDs) and cyanuric acid (CA) for ultralong PL applications.
  • To establish a facile synthesis method for the proposed material.

Main Methods:

  • Microwave-assisted heating of carbon dots and urea to form a composite material.
  • Characterization of the composite material's structure and photophysical properties.
  • Analysis of the persistent luminescence decay curves to determine emission lifetimes.

Main Results:

  • Successful synthesis of carbon dots embedded in cyanuric acid via microwave-assisted heating.
  • Observation of hour-level persistent luminescence from the synthesized material.
  • Demonstration of donor-acceptor blends within the composite, leading to intermediate states with long lifetimes.

Conclusions:

  • Carbon dots embedded in cyanuric acid offer a viable rare-earth-metal-free route to ultralong persistent luminescence.
  • The facile microwave-assisted synthesis provides an accessible method for producing these advanced luminescent materials.
  • The developed material shows promise for applications requiring sustained light emission without rare-earth elements.