Jump to main content
Jump to site search

Issue 8, 2019
Previous Article Next Article

Full color carbon dots through surface engineering for constructing white light-emitting diodes

Author affiliations

Abstract

White light-emitting diode (WLED) devices are replacing the filament lamp and can provide a light close to natural sunlight, and they have thus drawn considerable attention in recent years. It remains a scientific challenge to develop WLEDs using environmentally friendly, easy-to-process and cost-effective phosphors. Here we synthesized blue-, green- and red-carbon dots (denoted as B-, G- and R-CDs) by a facile solvothermal method with high dispersity both in an aqueous and organic solvent. The quantum yield (QY) of the R-CDs was up to 24.7%. These CDs can be easily dissolved in polyvinylpyrrolidone (PVP) colloid, leading to the production of ultraviolet (UV)-excited LED devices to avoid the retinal damage caused by blue ray excitation. The fluorescence emission of the WLED has a wide band, covering the whole visible light region. Importantly, the influence of doping that gives rise to the change of emissive colors has been elucidated by X-ray photoelectron spectroscopy (XPS) combined with a computational method in order to provide a systematic controllable tuning on the functionalization of CDs. As such, WLEDs were demonstrated with color coordinates of (0.33, 0.33), and a color temperature of 5612 K in the CIE chromaticity diagram with good anti-photobleaching and a color rendering index (CRI) of 89.

Graphical abstract: Full color carbon dots through surface engineering for constructing white light-emitting diodes

Back to tab navigation

Supplementary files

Publication details

The article was received on 15 Jan 2019, accepted on 29 Jan 2019 and first published on 30 Jan 2019


Article type: Communication
DOI: 10.1039/C9TC00274J
Citation: J. Mater. Chem. C, 2019,7, 2212-2218

  •   Request permissions

    Full color carbon dots through surface engineering for constructing white light-emitting diodes

    W. Cai, T. Zhang, M. Xu, M. Zhang, Y. Guo, L. Zhang, J. Street, W. Ong and Q. Xu, J. Mater. Chem. C, 2019, 7, 2212
    DOI: 10.1039/C9TC00274J

Search articles by author

Spotlight

Advertisements