Designed optimization of photoluminescence emission for carbon dots with bright blue emission at 416 nm and mono-exponential decay lifetime

Abbas Ruwaih M., Soheyli E., Naji J., Mutlugun E., Kikhavani T., Sahraei R.

Materials Letters, cilt.394, 2025 (SCI-Expanded) identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 394
  • Basım Tarihi: 2025
  • Doi Numarası: 10.1016/j.matlet.2025.138615
  • Dergi Adı: Materials Letters
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Academic Search Premier, Aerospace Database, Chemical Abstracts Core, Chimica, Communication Abstracts, Compendex, INSPEC, Metadex, Civil Engineering Abstracts
  • Anahtar Kelimeler: Carbon dots, Deep-blue emission, High quantum efficiency, Uniform energy levels
  • Abdullah Gül Üniversitesi Adresli: Evet

Özet

The presented study introduces optimized blue-emissive carbon dots (CDs) with high photoluminescence efficiency up to 65 % at 416 nm, large Stokes shift (69 nm), and full-width at half maximum (FWHM) of 73 nm. X-ray photoelectron spectroscopy confirmed the formation of carbon-based bonds as the main component of CDs, with reliable amounts of O, S, and N as dopant components. These features, along with single-exponential time-decay profile at long average lifetime of 10.05 ns, supported the significant role of uniformly distributed mid-gap energy levels in the recombination process. The simplicity, low-cost, non-toxicity, and short reaction time of CDs, along with their excellent emission properties in the deep-blue region, make them suitable for use in environmental monitoring and high-contrast bioimaging.