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Author

Kim, Byeong-Su
Soft and Hybrid Nanomaterials Lab
Research Interests
  • Carbon materials, polymer, Layer-by-Layer (LbL) assembly, hyperbranched polymer, polyglycerol (PG), bio-applications

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Time-Resolved Spectroscopy of the Ensembled Photoluminescence of Nitrogen- and Boron/nitrogen-doped Carbon Dots

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Title
Time-Resolved Spectroscopy of the Ensembled Photoluminescence of Nitrogen- and Boron/nitrogen-doped Carbon Dots
Author
Kim, SunghuYoo, Byung-KukChoi, YuriKim, Byeong-SuKwon, Oh Hoon
Issue Date
201805
Publisher
ROYAL SOC CHEMISTRY
Citation
PHYSICAL CHEMISTRY CHEMICAL PHYSICS, v.20, no.17, pp.11673 - 11681
Abstract
Carbon dots (CDs) have potential applications in various fields such as energy, catalysis, and bioimaging due to their strong and tuneable photoluminescence (PL), low toxicity, and robust chemical inertness. Although several PL mechanisms have been proposed, the origin of PL in CDs is still in debate because of the ensembled nature of the heterogeneous luminophores present in the CDs. To unravel the origin of PL in CDs, we performed time-resolved spectroscopy on two types of CDs: nitrogen-doped (N-CD) and boron-nitrogen co-doped (BN-CD). The PL decays were fitted by stretched exponential functions to estimate the distribution of the decay kinetics in the CDs, which have different PL lifetime distributions. Both CDs displayed main, blue emission decay in 15 ns, which originates from the dominant molecular state. The analysis of the non-exponential PL decay using stretched exponential fits revealed that the functional surface luminophores are less heterogeneous and have much lower populations in BN-CD than in N-CD.
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DOI
http://dx.doi.org/10.1039/C8CP01619D
ISSN
1463-9076
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