A novel mechanism for red emission carbon dots: hydrogen bond dominated molecular states emission

Carbon dots have emerged as novel fluorescent probes due to their remarkable optical properties; red emission is still rare, has a relatively low efficiency, and its mechanism remains ambiguous

Tianxiang Zhang; Jinyang Zhu; Yue Zhai; He Wang; Xue Bai; Biao Dong; Haiyu Wang; Hongwei Song

2017

Scholarcy highlights

  • Carbon dots have emerged as novel fluorescent probes due to their remarkable optical properties; red emission is still rare, has a relatively low efficiency, and its mechanism remains ambiguous
  • Relatively efficient red-emission CDs based on p-phenylenediamine were prepared through various solvothermal means, where the highest quantum yield approached 41.1% in n-amyl alcohol, which was the most efficient quantum yield reported to date
  • Various structural characterizations were performed and confirmed that the red emission originated from the molecular states consisting of a nitrogen-containing organic fluorophore
  • The CDs were dispersed in different organic solvents and showed tunable emission, evolving from green to orange-red in aprotic solvents and a red emission in protic solvents
  • Further solvent correlation studies indicated that the hydrogen bond effect between the CDs and solvents was the main mechanism leading to the spectral shift
  • This work opens a new window for recognizing the generation of tunable and red-emission CDs
  • Solid-state luminescent Carbon dots–polymers were fabricated, which demonstrated continuously tunable emission properties

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