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Mechanism for excitation-dependent photoluminescence from graphene quantum dots and other graphene oxide derivates: consensus, debates and challenges
KTH, School of Engineering Sciences (SCI), Applied Physics, Cell Physics. KTH, Centres, Science for Life Laboratory, SciLifeLab.
2016 (English)In: Nanoscale, ISSN 2040-3364, E-ISSN 2040-3372, Vol. 8, no 15, 7794-7807 p.Article, review/survey (Refereed) PublishedText
Abstract [en]

Luminescent nanomaterials, with wide applications in biosensing, bioimaging, illumination and display techniques, have been consistently garnering enormous research attention. In particular, those with wavelength-controllable emissions could be highly beneficial. Carbon nanostructures, including graphene quantum dots (GQDs) and other graphene oxide derivates (GODs), with excitation-dependent photoluminescence (PL), which means their fluorescence color could be tuned simply by changing the excitation wavelength, have attracted lots of interest. However the intrinsic mechanism for the excitation-dependent PL is still obscure and fiercely debated presently. In this review, we attempt to summarize the latest efforts to explore the mechanism, including the quantum confinement effect, surface traps model, giant red-edge effect, edge states model and electronegativity of heteroatom model, as well as the newly developed synergistic model, to seek some clues to unravel the mechanism. Meanwhile the controversial difficulties for each model are further discussed. Besides this, the challenges and potential influences of the synthetic methodology and development of the materials are illustrated extensively to elicit more thought and constructive attempts toward their application.

Place, publisher, year, edition, pages
Royal Society of Chemistry, 2016. Vol. 8, no 15, 7794-7807 p.
National Category
Nano Technology Physical Sciences
URN: urn:nbn:se:kth:diva-186574DOI: 10.1039/c6nr00605aISI: 000374159600001PubMedID: 27030656ScopusID: 2-s2.0-84964584555OAI: diva2:927959

QC 20160513

Available from: 2016-05-13 Created: 2016-05-13 Last updated: 2016-05-16Bibliographically approved

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Xu, Hao
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Cell PhysicsScience for Life Laboratory, SciLifeLab
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