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<p>Fantastic carbon dots (CDs) with solution-processing, eco-friendliness, and scalable manufacturing receive giant attention in luminescence. Herein, we demonstrate solution-processed CDs synthesized from citric acid, urea, and N-Methyl-2-pyrrolidone system with a microwave-assisted method. It offers rapid synthesis (&lt; 10&#xa0;min), good dispersibility, acceptable quantum yield (27.8%), graphitic carbon core, and uniform particle size. With CDs-doped polyvinylpyrrolidone as a composite fluorescent layer, the 365-, 395-, 410-, and 460-nm excitation gives strong photoluminescence and large full width at half maximum (~ 150&#xa0;nm). The 460-nm excited LED gives 480,812&#xa0;cd&#xa0;m<sup>−2</sup> luminance and 43.0&#xa0;lm W<sup>−1</sup> power efficiency, which are superior to the counterparts. With CDs-doped poly(N-vinyl carbazole) (PVK) as an emitter, the electroluminescent LED achieves a maximum luminance of 866&#xa0;cd&#xa0;m<sup>−2</sup> and voltage-dependent color tunability from violet emission of PVK at low voltages to near white emission of CDs, PVK, and the PVK/CDs interface at high voltages. This work highlights potential CDs synthesis with efficient and wide emission, opening up novel approaches for assembling high-performance photoluminescent and electroluminescent LEDs.</p>

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Carbon dots synthesized from citric acid, urea, and N-Methyl-2-pyrrolidone system for feasible applications in photoluminescence and electroluminescence

  • 期刊论文

  • 发表日期：

    2025年9月24日

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  • Bingyu Wang,
  • Jiaqing Liu,
  • Zhenchang Tang,
  • Yi Wang,
  • Jia Yuan,
  • Yingling Xiao,
  • Junfeng Liang,
  • Honghang Wang,
  • Liming Liu,
  • Xiaowen Zhang

摘要

Fantastic carbon dots (CDs) with solution-processing, eco-friendliness, and scalable manufacturing receive giant attention in luminescence. Herein, we demonstrate solution-processed CDs synthesized from citric acid, urea, and N-Methyl-2-pyrrolidone system with a microwave-assisted method. It offers rapid synthesis (< 10 min), good dispersibility, acceptable quantum yield (27.8%), graphitic carbon core, and uniform particle size. With CDs-doped polyvinylpyrrolidone as a composite fluorescent layer, the 365-, 395-, 410-, and 460-nm excitation gives strong photoluminescence and large full width at half maximum (~ 150 nm). The 460-nm excited LED gives 480,812 cd m−2 luminance and 43.0 lm W−1 power efficiency, which are superior to the counterparts. With CDs-doped poly(N-vinyl carbazole) (PVK) as an emitter, the electroluminescent LED achieves a maximum luminance of 866 cd m−2 and voltage-dependent color tunability from violet emission of PVK at low voltages to near white emission of CDs, PVK, and the PVK/CDs interface at high voltages. This work highlights potential CDs synthesis with efficient and wide emission, opening up novel approaches for assembling high-performance photoluminescent and electroluminescent LEDs.