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Related Experiment Video

Updated: Feb 14, 2026

Step-by-Step Guide for Harnessing Organic Light Emitting Diodes by Solution Processed Device Fabrication of a TADF Emitter
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Carbon dots with efficient solid-state red-light emission through the step-by-step surface modification towards

Jinyang Zhu1, Xue Bai, Xu Chen

  • 1State Key Laboratory on Integrated Optoelectronics, College of Electronic Science and Engineering, Jilin University, 2699 Qianjin Street, Changchun, 130012, P. R. China. baix@jlu.edu.cn songhw@jlu.edu.cn.

Dalton Transactions (Cambridge, England : 2003)
|February 16, 2018
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Summary

Highly red light emitting carbon dots (CDs) were developed for efficient solid-state applications. These CDs achieve high photoluminescence quantum yield, enabling improved white light-emitting diodes (WLEDs) with tunable color and high color rendering index.

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Optoelectronics

Background:

  • Carbon dots (CDs) are widely recognized for their unique properties.
  • Achieving efficient, solid-state long-wavelength emission, particularly red light, from CDs remains a challenge.
  • High photoluminescence quantum yield (QY) is crucial for practical applications.

Purpose of the Study:

  • To develop highly red light-emitting carbon dots (CDs) with efficient solid-state emission.
  • To enhance the photoluminescence quantum yield (QY) of red-emitting CDs.
  • To demonstrate the application of these red CDs in white light-emitting diodes (WLEDs).

Main Methods:

  • Step-by-step surface modification of nitrogen-doped CDs.
  • Introduction of hexadecyltrimethyl ammonium bromide to aqueous CD solutions to enhance QY.
  • Dispersion of CDs in a polyvinylpyrrolidone (PVP) matrix to create solid-state films.
  • Fabrication of UV-pumped WLEDs using red, green, and blue emitting CDs.
  • Evaluation of red CDs as color converters in traditional YAG-based WLEDs.

Main Results:

  • Surface modification and modulation with hexadecyltrimethyl ammonium bromide significantly increased the QY of red CDs from 23.2% to 43.6%.
  • Solid-state films of CDs in a PVP matrix maintained a high QY of 41.3%, effectively suppressing solid-state quenching.
  • UV-pumped WLEDs fabricated with these red CDs, alongside blue and green CDs, exhibited tunable correlated color temperatures (CCT) from 7879 to 2961 K.
  • The developed WLEDs achieved a high color rendering index (CRI) of 93, surpassing existing semiconductor quantum dot-based WLEDs.
  • Red CDs showed potential as color converters to improve CCT and CRI in YAG-based WLEDs.

Conclusions:

  • Highly efficient solid-state red-emitting carbon dots were successfully synthesized through surface modification.
  • The developed red CDs are suitable for fabricating high-performance WLEDs with tunable color and superior color rendering.
  • These carbon dots offer a promising alternative for advanced lighting applications, including enhancing existing WLED technologies.