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Tuning the Emission Energy of Chemically Doped Graphene Quantum Dots
Islamia University of Bahawalpur, Pakistan.
Linköping University, Department of Physics, Chemistry and Biology, Semiconductor Materials. Linköping University, Faculty of Science & Engineering.
Linköping University, Department of Physics, Chemistry and Biology, Thin Film Physics. Linköping University, Faculty of Science & Engineering.
Islamia University of Bahawalpur, Pakistan.
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2016 (English)In: NANOMATERIALS, ISSN 2079-4991, Vol. 6, no 11, article id 198Article in journal (Refereed) Published
Abstract [en]

Tuning the emission energy of graphene quantum dots (GQDs) and understanding the reason of tunability is essential for the GOD function in optoelectronic devices. Besides material-based challenges, the way to realize chemical doping and band gap tuning also pose a serious challenge. In this study, we tuned the emission energy of GQDs by substitutional doping using chlorine, nitrogen, boron, sodium, and potassium dopants in solution form. Photoluminescence data obtained from (Cl- and N-doped) GQDs and (B-, Na-, and K-doped) GQDs, respectively exhibited red- and blue-shift with respect to the photoluminescence of the undoped GQDs. X-ray photoemission spectroscopy (XPS) revealed that oxygen functional groups were attached to GQDs. We qualitatively correlate red-shift of the photoluminescence with the oxygen functional groups using literature references which demonstrates that more oxygen containing groups leads to the formation of more defect states and is the reason of observed red-shift of luminescence in GQDs. Further on, time resolved photoluminescence measurements of Cl- and N-GQDs demonstrated that Cl substitution in GQDs has effective role in radiative transition whereas in N-GQDs leads to photoluminescence (PL) quenching with non-radiative transition to ground state. Presumably oxidation or reduction processes cause a change of effective size and the bandgap.

Place, publisher, year, edition, pages
MDPI AG , 2016. Vol. 6, no 11, article id 198
Keyword [en]
graphene quantum dots; emission energy; XPS; photoluminescence; time resolved photoluminescence
National Category
Inorganic Chemistry
Identifiers
URN: urn:nbn:se:liu:diva-133894DOI: 10.3390/nano6110198ISI: 000390103400008OAI: oai:DiVA.org:liu-133894DiVA, id: diva2:1065061
Note

Funding Agencies|Higher Education Commission Pakistan (HEC) under NRPU [2913/RD]; Graphene Flagship [CNECT-ICT-604391]; Angpanneforeningen Research Foundation; Swedish Research Council [2015-05876]; Rositsa Yakimova

Available from: 2017-01-13 Created: 2017-01-13 Last updated: 2018-03-20

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Eriksson, Martin OSchmidt, SusannHoltz, Per-OlofSyväjärvi, MikaelYazdi, Gholamreza
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Semiconductor MaterialsFaculty of Science & EngineeringThin Film PhysicsDepartment of Physics, Chemistry and Biology
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