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<p>High-colour-purity violet light-emitting diodes (LEDs) with colour coordinates close to the human visual threshold are essential for achieving wide-colour-gamut displays. However, it remains challenging for visible-light emitters to achieve both luminescence peaks shorter than 400 nm and a full-width at half-maximum (FWHM) below 20 nm due to irreducible <i>π</i>-conjugation length and strong vibrational relaxation in the excited state. Here this study introduces planar oxygen-doped carbon quantum rings (OD-CQRs) composed of twelve benzene rings and six embedded five-membered oxygen heterocycles. These OD-CQRs exhibit a fluorescence peak centre at 393 nm, a FWHM of 18 nm and a photoluminescence quantum yield of 95%. Detailed structural characterizations coupled with theoretical calculations reveal that the ring profile and alternatively embedded oxygen heterocycles in OD-CQRs effectively suppress <i>π</i>-electron delocalization and excited-state vibrational relaxation, due to non-bonding electron characteristics. The electroluminescent LEDs based on OD-CQRs demonstrate high-colour-purity violet emission with chromaticity coordinates of (0.161, 0.017), approaching the edge of the visible colour space.</p><p></p>

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Pure-violet oxygen-doped carbon quantum rings with near-unity quantum yield and a full-width at half-maximum of 18 nm

  • 期刊论文

  • 发表日期：

    2025年10月30日

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  • Xianzhi Song,
  • Chen Zhang,
  • Diandong Tang,
  • Yang Zhang,
  • Ting Yuan,
  • Ting Meng,
  • Yuxin Shi,
  • Jing Guo,
  • Lin Shen,
  • Xiaohong Li,
  • Yunchao Li,
  • Zhan’ao Tan,
  • Fanglong Yuan,
  • Louzhen Fan

摘要

High-colour-purity violet light-emitting diodes (LEDs) with colour coordinates close to the human visual threshold are essential for achieving wide-colour-gamut displays. However, it remains challenging for visible-light emitters to achieve both luminescence peaks shorter than 400 nm and a full-width at half-maximum (FWHM) below 20 nm due to irreducible π-conjugation length and strong vibrational relaxation in the excited state. Here this study introduces planar oxygen-doped carbon quantum rings (OD-CQRs) composed of twelve benzene rings and six embedded five-membered oxygen heterocycles. These OD-CQRs exhibit a fluorescence peak centre at 393 nm, a FWHM of 18 nm and a photoluminescence quantum yield of 95%. Detailed structural characterizations coupled with theoretical calculations reveal that the ring profile and alternatively embedded oxygen heterocycles in OD-CQRs effectively suppress π-electron delocalization and excited-state vibrational relaxation, due to non-bonding electron characteristics. The electroluminescent LEDs based on OD-CQRs demonstrate high-colour-purity violet emission with chromaticity coordinates of (0.161, 0.017), approaching the edge of the visible colour space.