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<p>In this study, the synthesis and characterization of nitrogen-doped graphene quantum dots (N-GQDs) were exhibited tunable photoluminescence (PL) properties, enabling color emission shifts from blue to red. N-GQDs were synthesized under varying Ethanol/H₂O ratios. The molecular structure of the precursors and the presence of key functional groups, as identified through Fourier transform infrared (FTIR) spectra, play critical roles in modulating the emission behavior of N-GQDs. Detailed analysis of their optical properties, including absorption, photoluminescence excitation (PLE), and photoluminescence (PL) spectra, revealed that the emission color changes result from alterations in energy levels within the Cπ*—Cπ bandgap due to quantum confinement effects and nitrogen-related defects. Notably, the N-GQDs samples, which were synthesized with a 90/10 Ethanol/H₂O ratio, it exhibited optimal PL intensity and a pronouncedred-shifted emission (~ 600&#xa0;nm), highlighting its potential for bio-labeling and optoelectronic applications. Furthermore, the tunable emission behavior, demonstrated through adjustments in precursor composition and solvent ratios, underscores the versatility of N-GQDs in applications such as multicolor displays and solid-state luminescence. These findings provide valuable insights into the relationship between synthesis parameters, surface functionalization, and optical properties, paving the way for the rational design of GQD-based materials for advanced technological applications.</p>

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Tunable photoluminescence from blue to red in nitrogen-doped graphene quantum dots: structural characterization and emission mechanism

  • 期刊论文

  • 发表日期：

    2025年9月5日

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  • Pham Thu Nga,
  • Nguyen Thi Mai Huong,
  • Nguyen Hai Yen,
  • Le Dai Vuong,
  • Nguyen Huynh Mai Hanh,
  • Phan Xuan Thien,
  • Le Xuan Hung

摘要

In this study, the synthesis and characterization of nitrogen-doped graphene quantum dots (N-GQDs) were exhibited tunable photoluminescence (PL) properties, enabling color emission shifts from blue to red. N-GQDs were synthesized under varying Ethanol/H₂O ratios. The molecular structure of the precursors and the presence of key functional groups, as identified through Fourier transform infrared (FTIR) spectra, play critical roles in modulating the emission behavior of N-GQDs. Detailed analysis of their optical properties, including absorption, photoluminescence excitation (PLE), and photoluminescence (PL) spectra, revealed that the emission color changes result from alterations in energy levels within the Cπ*—Cπ bandgap due to quantum confinement effects and nitrogen-related defects. Notably, the N-GQDs samples, which were synthesized with a 90/10 Ethanol/H₂O ratio, it exhibited optimal PL intensity and a pronouncedred-shifted emission (~ 600 nm), highlighting its potential for bio-labeling and optoelectronic applications. Furthermore, the tunable emission behavior, demonstrated through adjustments in precursor composition and solvent ratios, underscores the versatility of N-GQDs in applications such as multicolor displays and solid-state luminescence. These findings provide valuable insights into the relationship between synthesis parameters, surface functionalization, and optical properties, paving the way for the rational design of GQD-based materials for advanced technological applications.