A novel method for the synthesis of carbon dots assisted by free radicals  

作　　者：Xinyue Zhou Kebing Yi Yeling Yang Guohua Xie Xinghu Ji Zhike He 

机构地区：[1]College of Chemistry and Molecular Sciences,Wuhan University,Wuhan 430072,China [2]Sauvage Center for Molecular Sciences,Hubei Key Lab on Organic and Polymeric Optoelectronic Materials,Department of Chemistry,Wuhan University,Wuhan 430072,China

出　　处：《Nano Research》2022年第10期9470-9478,共9页纳米研究（英文版）

基　　金：support from the National Natural Science Foundation of China(Nos.21974101 and 22174102).

摘　　要：Carbon dots(CDs)have gradually become a widely favored type of fluorescent nanomaterials with unlimited and promising applications.This work reports a means of breaking the shackle of method to develop new red and white CDs by introducing free radicals.The resulting white emissive CDs in this strategy are employed to demonstrate electroluminescent white-light-emitting diodes(WLEDs)and achieve a record-high external quantum efficiency(0.95%)of one-step-produced white CDs(WCD)-LEDs,which dramatically simplifies the whole fabrication processes of WLEDs.With additional passivation treatment,the red CDs(RCD2)with excellent properties such as N and S co-doping,bright(quantum yield=49%)and stable photoluminescence(PL),large positive zeta potential(+20.5 mV),and two-photon fluorescence are obtained.Such RCD2 are used for rapid staining(5 min)of yeast cells.The two CDs synthesized via this method have outstanding performance in different aspects,which provides new promise of CDs for further functionalization and applications.

关 键 词：carbon dots electroluminescent white-light-emitting diodes(LED) TWO-PHOTON rapid cell staining synthesis method 

分 类 号：TB383[一般工业技术—材料科学与工程]