Exciton dynamics in luminescent carbon nanodots: Electron–hole exchange interaction

Bo Peng, Xin Lu, Shi Chen, Cheng Hon Alfred Huan, Qihua Xiong, Evren Mutlugun, Hilmi Volkan Demir, Siu Fung Yu

Research output: Journal article publicationJournal articleAcademic researchpeer-review

9 Citations (Scopus)


The electron–hole exchange interaction significantly influences the optical properties of excitons and radiative decay. However, exciton dynamics in luminescent carbon dots (Cdots) is still not clear. In this study, we have developed a simple and efficient one-step strategy to synthesize luminescent Cdots using the pyrolysis of oleylamine. The sp2 clusters of a few aromatic rings are responsible for the observed blue photoluminescence. The size of these clusters can be tuned by controlling the reaction time, and the energy gap between the π–π* states of the sp2 domains decreases as the sp2 cluster size increases. More importantly, the strong electron–hole exchange interaction results in the splitting of the exciton states of the sp2 clusters into the singlet-bright and triplet-dark states with an energy difference ΔE, which decreases with increasing sp2 cluster size owing to the reduction of the confinement energy and the suppression of the electron–hole exchange interaction. [Figure not available: see fulltext.]
Original languageEnglish
Pages (from-to)549-559
Number of pages11
JournalNano Research
Issue number2
Publication statusPublished - 1 Feb 2016


  • carbon dots
  • electron–hole exchange interaction
  • energy splitting
  • photoluminescence
  • pyrolysis

ASJC Scopus subject areas

  • Materials Science(all)
  • Electrical and Electronic Engineering


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