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Synthesis and upconversion luminescence of N-doped graphene quantum dots
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10.1063/1.4750065
/content/aip/journal/apl/101/10/10.1063/1.4750065
http://aip.metastore.ingenta.com/content/aip/journal/apl/101/10/10.1063/1.4750065

Figures

Image of FIG. 1.
FIG. 1.

Microstructure of the N-GQDs: (a) TEM image. (b) Diameter distribution. (c), (d) High-resolution N 1s (c) and C 1s (d) spectra.

Image of FIG. 2.
FIG. 2.

(a) UV-vis absorption and (b) PL spectra of the N-GQDs at different excitation wavelengths. Inset of (a): Optical photograph of the N-GQDs dispersed in water under 365 nm irradiation. (c) PLE spectrum with the detection wavelength of 425 nm. (d) Typical electronic transitions of triple carbenes in the optical spectrum (c).

Image of FIG. 3.
FIG. 3.

(a) Upconverted PL spectra and (b) PLE spectrum of the N-GQDs at different excitation wavelengths and the monitoring wavelength of 425 nm. (c) and (d) A schematic illustration of two typical electronic transitions processes of the N-GQDs: (c) normal PL mechanism and (d) upconverted PL mechanism.

Tables

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Table I.

Quantum yield of N-GQDs using quinine sulfate as a reference.

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/content/aip/journal/apl/101/10/10.1063/1.4750065
2012-09-05
2014-04-16
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Synthesis and upconversion luminescence of N-doped graphene quantum dots
http://aip.metastore.ingenta.com/content/aip/journal/apl/101/10/10.1063/1.4750065
10.1063/1.4750065
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