A simple and green synthesis of carbon quantum dots from coke for white light-emitting devices

Xiaoting Feng; Yi Zhang

doi:10.1039/c9ra06946a

A simple and green synthesis of carbon quantum dots from coke for white light-emitting devices

RSC Adv. 2019 Oct 21;9(58):33789-33793. doi: 10.1039/c9ra06946a. eCollection 2019 Oct 18.

Authors

Xiaoting Feng¹, Yi Zhang¹

Affiliation

¹ Department of Chemistry and Chemical Engineering, Lu Liang University Lvliang 033001 China xiaotingfeng@llhc.edu.cn yiyi9900474@163.com.

Abstract

Coke is a by-product of coal. This paper reports a simple and green chemical oxidation method for carbon quantum dots (CQDs) from coke for use in novel applications. The CQDs emit blue fluorescence and have a fluorescence quantum yield of 9.2% and blue-green-red spectral composition of 48%. A light-emitting diode (LED) was fabricated by combining the CQDs as a white-light converter with an ultraviolet chip. The Commission Internationale de L'Eclairage chromaticity coordinate (0.31, 0.35) and correlated color temperature (5125 K) of the LED are located in a cool white light zone, suggesting that they have superior potential application in lighting devices.