Recent development of carbon quantum dots regarding their optical properties, photoluminescence mechanism, and core structure

We summarized the PL decay lifetime of Carbon quantum dots in recent years with the aim of comparing different syntheses and finding the best reaction conditions

Keenan J. Mintz; Yiqun Zhou; Roger M. Leblanc

2019

Scholarcy highlights

  • Carbon quantum dots were discovered in 2004 when Xu et al were attempting to prepare single walled carbon nanotubes
  • As seen in Scheme 1, the number of citations regarding quantum yield and PL lifetime has grown exponentially over the last ten to fifteen years. This has led to a vast amount of literature for CDs, with many papers using different methods and precursors, which has added to the confusion that surrounds CDs PL mechanism, as many different explanations regarding the phenomena surrounding CDs are different
  • The same preparation was performed at four different temperatures and the PL properties such as QY and PL decay lifetime varied depending on the amino-passivation degree of the surface of CDs which was determined by the reaction temperature
  • Nitrogen doping is well known to increase the QY for CDs, but this study provides more information on the specific groups which increase QY
  • Carbon sources used for preparing CDs have ranged from graphite, proteins, small molecules, and food products
  • Top-down methods such as laser ablation or electrochemical methods do not often produce CDs which are used in applications such as sensing and imaging, as the QY from these CDs tends to be lower
  • The obtained PL decay lifetime doesn’t have an obvious enhancement regarding either “top-down” or “bottom-up” approach

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