Jump to main content
Jump to site search


Green luminescence origin of carbon quantum dots: specific luminescence bands originate from oxidized carbon groups

Abstract

As a newly developed fluorescent material, carbon dots (CDs) have exhibited promising potentials in bioimaging and light-emitting diodes (LEDs), but the luminescent origins are still ambiguous. Here, we propose surface states associated with carboxyl and carbonyl functional groups for the radiative transitions in the green waveband from CDs according to comprehensive analyses on spectra, interior and surface structures, and the correlations between them. The ESR signals under dark and light conditions indicating the more contribution of carboxyl groups and the emission change after reduction or oxidization also confirm our conclusions. A whole picture of luminescence mechanism is drawn and the excitation dependent behavior is recommended to be attributed to the respective dominating or the so called competition of different transition modes under different excitations. Finally, luminescent elastomer is prepared with high endurance of stretch and twist. In addition, TiO2 nanowire arrays decorated with CDs exhibit enhanced photocurrent response to visible light, indicating the potential applications in photovoltaic conversion devices.

Back to tab navigation

Supplementary files

Publication details

The article was received on 23 Nov 2017, accepted on 05 Feb 2018 and first published on 06 Feb 2018


Article type: Paper
DOI: 10.1039/C7NJ04562J
Citation: New J. Chem., 2018, Accepted Manuscript
  •   Request permissions

    Green luminescence origin of carbon quantum dots: specific luminescence bands originate from oxidized carbon groups

    Z. Sun, X. Li, Y. Wu, C. Wei and H. Zeng, New J. Chem., 2018, Accepted Manuscript , DOI: 10.1039/C7NJ04562J

Search articles by author

Spotlight

Advertisements