Wavelength-tunable visible to near-infrared photoluminescence of carbon dots: The role of quantum confinement and surface states

Morteza Sasani Ghamsari, Ashkan Momeni Bidzard, Wooje Han, Hyung Ho Park

Research output: Contribution to journalArticle

11 Citations (Scopus)

Abstract

Carbon quantum dots (C-QDs) with different size distributions and surface characteristics can exhibit good emission properties in the visible and near-infrared (NIR) regions, which can be applicable in optoelectronic devices as well as biomedical applications. Optical properties of colloidal C-QDs in distilled water at different concentrations produced using a method of alkali-assisted surfactant-free oxidation of cellulose acetate is presented. The structural and optical properties of colloidal C-QDs at different concentrations were investigated, with the aim of clarifying the main mechanisms of photoluminescence emissions. We observed a wide range of tunable visible to NIR emissions with good stability from the C-QD colloids at different applied excitation wavelengths. The colloids show dual emissions with maxima at ∼420 and 775 nm (blue and NIR emissions) when excited at the wavelength range near the energy gaps of the C-QDs. Moreover, by increasing the excitation wavelength, tunable visible emissions at the spectral range of 475 to 550 nm are observed. A detailed analysis of the results shows that the blue and NIR luminescence of colloidal C-QDs originate from the oxide-related surface effects whereas quantum confinement is the responsible mechanism for tunable visible emissions of the C-QD colloid.

Original languageEnglish
Article number026028
JournalJournal of Nanophotonics
Volume10
Issue number2
DOIs
Publication statusPublished - 2016 Apr 1

Fingerprint

Quantum confinement
Surface states
Semiconductor quantum dots
Photoluminescence
Carbon
Infrared radiation
photoluminescence
quantum dots
Wavelength
carbon
Colloids
wavelengths
colloids
Optical properties
optical properties
Alkalies
Surface-Active Agents
Optoelectronic devices
Oxides
optoelectronic devices

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

Cite this

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abstract = "Carbon quantum dots (C-QDs) with different size distributions and surface characteristics can exhibit good emission properties in the visible and near-infrared (NIR) regions, which can be applicable in optoelectronic devices as well as biomedical applications. Optical properties of colloidal C-QDs in distilled water at different concentrations produced using a method of alkali-assisted surfactant-free oxidation of cellulose acetate is presented. The structural and optical properties of colloidal C-QDs at different concentrations were investigated, with the aim of clarifying the main mechanisms of photoluminescence emissions. We observed a wide range of tunable visible to NIR emissions with good stability from the C-QD colloids at different applied excitation wavelengths. The colloids show dual emissions with maxima at ∼420 and 775 nm (blue and NIR emissions) when excited at the wavelength range near the energy gaps of the C-QDs. Moreover, by increasing the excitation wavelength, tunable visible emissions at the spectral range of 475 to 550 nm are observed. A detailed analysis of the results shows that the blue and NIR luminescence of colloidal C-QDs originate from the oxide-related surface effects whereas quantum confinement is the responsible mechanism for tunable visible emissions of the C-QD colloid.",
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Wavelength-tunable visible to near-infrared photoluminescence of carbon dots : The role of quantum confinement and surface states. / Ghamsari, Morteza Sasani; Bidzard, Ashkan Momeni; Han, Wooje; Park, Hyung Ho.

In: Journal of Nanophotonics, Vol. 10, No. 2, 026028, 01.04.2016.

Research output: Contribution to journalArticle

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AU - Park, Hyung Ho

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