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Issue 5, 2017

Excitation wavelength independent visible color emission of carbon dots

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Abstract

Carbon dots (CDs) usually emit a strong blue light and excitation wavelength dependent long wavelength lights. This significantly limits their applications because one has to use a series of different excitation light sources to get different colors and the long wavelength emissions are usually very weak. We found that one type of CDs synthesized from p-phenylenediamine could emit various long wavelength lights (green to red) independent of the excitation wavelength when dispersed in different solvents. The photoluminescence quantum yields of the same CDs were 10–35% in different solvents for different color emissions. Based on this solvent-color effect, we further mixed the same CDs with different polymers to form solid CD films for various color emissions, and these film emissions were also excitation wavelength independent. Multicolor LEDs were demonstrated with the same CDs in solution and solid film states for color displays.

Graphical abstract: Excitation wavelength independent visible color emission of carbon dots

Supplementary files

Article information


Submitted
26 Nov 2016
Accepted
04 Jan 2017
First published
17 Jan 2017

Nanoscale, 2017,9, 1909-1915
Article type
Paper

Excitation wavelength independent visible color emission of carbon dots

H. Wang, C. Sun, X. Chen, Y. Zhang, V. L. Colvin, Q. Rice, J. Seo, S. Feng, S. Wang and W. W. Yu, Nanoscale, 2017, 9, 1909 DOI: 10.1039/C6NR09200D

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