Issue 47, 2018

Concentrated solar irradiation protocols for the efficient synthesis of tri-color emissive carbon dots and photophysical studies

Abstract

In contrast to conventional nanomaterials or organic dyes, carbon dots possess a variety of appealing properties including chemical inertness and easy manipulation and they can be dispersed in water. Herein, the use of a concentrated solar irradiation sintering strategy for the rapid and efficient assembly of carbon dots (CDs) has been reported for the first time. This novel alternative pathway effectively uses a renewable source and the process is feasible and environmentally sustainable. Three kinds of CDs were obtained, which demonstrate blue, green and red luminescence. Highly efficient blue-emitting CDs with quantum yield as high as 81% have been realized. The blue and red carbon dots give rise to excitation-independent emission peaks at 443 and 592 nm, respectively; however, the green CDs feature a continuous shift and the evolution of emission curves varies from 480 to 538 nm. By regulating the composition and ratios of these tri-color carbon dots, the emission band generates peaks from blue to red light, which cover almost the entire visible light range. Upon a single ultra-violet excitation at 365 nm, a white-light emission with CIE coordinates of (0.28, 0.33) was detected and the signal was very close to pure white light (0.33, 0.33). This study introduces a new method for fabricating low-cost nanoparticles as potential phosphors for light-emitting uses.

Graphical abstract: Concentrated solar irradiation protocols for the efficient synthesis of tri-color emissive carbon dots and photophysical studies

Supplementary files

Article information

Article type
Paper
Submitted
26 Sep 2018
Accepted
06 Nov 2018
First published
10 Nov 2018

J. Mater. Chem. C, 2018,6, 13013-13022

Concentrated solar irradiation protocols for the efficient synthesis of tri-color emissive carbon dots and photophysical studies

D. Lu, Y. Tang, J. Gao and Q. Wang, J. Mater. Chem. C, 2018, 6, 13013 DOI: 10.1039/C8TC04849E

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