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<p>Solid-state fluorescent carbon dots (CDs) have been extensively utilized as efficient phosphors in the fabrication of light-emitting diodes (LEDs). Among the various CDs, red-emissive CDs are indispensable in full-color light-emitting devices. In this work, red-emissive CDs with optimal emission peak at 657 nm and shoulder peak extending to 701 nm were successfully prepared with <i>o</i>-phenylenediamine as the carbon source after systematically optimizing the acid additive, reaction solvent, and the synthesis methods. The influences of different dispersing agents on the properties of the CD-derived red phosphors were also evaluated. After careful optimization, red LEDs with emissions spanning from 650 to 800&#xa0;nm were constructed, which achieved an extremely high CRI R9 value of 91.1, highlighting the great potential of current CDs in the lighting and agriculture industry.</p>

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Proton-activated o-phenylenediamine for red light-emitting carbon dots preparation and LED construction

  • 期刊论文

  • 发表日期：

    2026年3月10日

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  • Jiaqing Li,
  • Ya Su,
  • Jian Qin,
  • Fanhao Zeng,
  • Qiurui Han,
  • Wenjun Xu,
  • Zhili Peng

摘要

Solid-state fluorescent carbon dots (CDs) have been extensively utilized as efficient phosphors in the fabrication of light-emitting diodes (LEDs). Among the various CDs, red-emissive CDs are indispensable in full-color light-emitting devices. In this work, red-emissive CDs with optimal emission peak at 657 nm and shoulder peak extending to 701 nm were successfully prepared with o-phenylenediamine as the carbon source after systematically optimizing the acid additive, reaction solvent, and the synthesis methods. The influences of different dispersing agents on the properties of the CD-derived red phosphors were also evaluated. After careful optimization, red LEDs with emissions spanning from 650 to 800 nm were constructed, which achieved an extremely high CRI R9 value of 91.1, highlighting the great potential of current CDs in the lighting and agriculture industry.