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Exciton dynamics in luminescent carbon nanodots: Electron–hole exchange interaction
Peng B.1; Lu X.1; Chen S.1; Huan C.H.A.1; Xiong Q.1; Mutlugun E.1; Demir H.V.1; Yu S.F.2
2016-02-01
Source PublicationNano Research
ISSN19980000 19980124
Volume9Issue:2Pages:549-559
AbstractThe 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 sp 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 sp domains decreases as the sp cluster size increases. More importantly, the strong electron–hole exchange interaction results in the splitting of the exciton states of the sp clusters into the singlet-bright and triplet-dark states with an energy difference ΔE, which decreases with increasing sp cluster size owing to the reduction of the confinement energy and the suppression of the electron–hole exchange interaction. [Figure not available: see fulltext.]
Keywordcarbon dots electron–hole exchange interaction energy splitting photoluminescence pyrolysis
DOI10.1007/s12274-015-0936-2
URLView the original
Language英語
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Cited Times [WOS]:6   [WOS Record]     [Related Records in WOS]
Document TypeJournal article
CollectionUniversity of Macau
Affiliation1.Nanyang Technological University
2.Hong Kong Polytechnic University
3.University of Electronic Science and Technology of China
Recommended Citation
GB/T 7714
Peng B.,Lu X.,Chen S.,et al. Exciton dynamics in luminescent carbon nanodots: Electron–hole exchange interaction[J]. Nano Research,2016,9(2):549-559.
APA Peng B.,Lu X.,Chen S.,Huan C.H.A.,Xiong Q.,Mutlugun E.,Demir H.V.,&Yu S.F..(2016).Exciton dynamics in luminescent carbon nanodots: Electron–hole exchange interaction.Nano Research,9(2),549-559.
MLA Peng B.,et al."Exciton dynamics in luminescent carbon nanodots: Electron–hole exchange interaction".Nano Research 9.2(2016):549-559.
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