Aqueous synthesis of 79%efficient AgInGaS/ZnS quantum dots for extremely high color rendering white light-emitting diodes  

作　　者：Zhe Hu Hanxu Lu Wenjie Zhou Jinxin Wei Hanqing Dai b Hong Liu Zhiyong Xiong Fengxian Xie Wanlu Zhang Ruiqian Guo 

机构地区：[1]Institute for Electric Light Sources,School of Information Science and Technology,Fudan University,Shanghai 200433,China [2]Institute of Future Lighting,Academy for Engineering and Technology,Fudan University,Shanghai 200433,China [3]Zhongshan-Fudan Joint Innovation Center,Zhongshan 528437,China [4]Yiwu Research Institute of Fudan University,Yiwu 322000,China

出　　处：《Journal of Materials Science & Technology》2023年第3期189-196,共8页材料科学技术（英文版）

基　　金：supported by the National Natural Science Foundation of China(NSFC,No.62074044,NSFC,No.61904036),Zhongshan-Fudan Joint Innovation Center,Jihua Laboratory Projects of Guangdong Province(X190111UZ190);Shanghai Post-doctoral Excellence Program(2021016);Shanghai Rising-Star program(22YF1402000).

摘　　要：Over the past few decades,I-III-VI quantum dots(QDs)have attracted considerable attention due to their large Stokes shifts,good eco-friendliness,and wide tunable emissions.In this work,a facile microwave-assisted aqueous route using glutathione(GSH)and citric acid(CA)as dual stabilizers is introduced to synthesize AgInGaS/ZnS(AIGS/ZnS)core/shell QDs.An exceptional photoluminescence quantum yield(PL QY)as high as 79%is successfully achieved,boosting the best performance of water-dispersible AIGS QDs.By varying the Ag/Ga ratio,the PL peak wavelength can be tuned from 547 to 616 nm,and luminescent hydrogel films with different colors are obtained by embedding AIGS/ZnS QDs in polyacrylamide/poly-vinyl alcohol(PAAm/PVA)hydrogels.The white light-emitting diode(WLED)with a high color rendering index(CRI)of 92.1(R_(9)=92.0)and a correlated color temperature(CCT)of 3022 K is fabricated using QDs-PAAm/PVA hydrogel films in combination with a blue InGaN LED chip,indicating that the as-prepared QDs are competitive color-conversion materials for WLEDs.

关 键 词：AgInGaS/ZnS Aqueous synthesis Quantum dots White LEDs 

分 类 号：O657.3[理学—分析化学] TQ127.11[理学—化学]