Understanding excitonic behavior and electroluminescence light emitting diode application of carbon dots  

作　　者：Yuan Liu Boyang Wang Yaxin Li Weidong Li Siyu Lu 

机构地区：[1]School of Chemistry and Chemical Engineering,Henan University of Technology,Zhengzhou 450001,China [2]College of Chemistry,Zhengzhou University,Zhengzhou 450001,China [3]College of Material Engineering,Henan International Joint Laboratory of Rare Earth Composite Materials,Henan University of Engineering,Zhengzhou 451191,China

出　　处：《Chinese Chemical Letters》2025年第2期173-178,共6页中国化学快报(英文版)

基　　金：supported by the National Natural Science Foundation of China(Nos.22205058,22105064,52122308);the Funding Plan of Key Scientific Research Projects in Colleges and Universities of Henan Province(No.23A150001);Doctoral Scientific Research Start-up Foundation from Henan University of Technology(No.2021BS024);the Project of Youth Backbone Teachers of Henan University of Technology(No.21421250);the Innovative Funds Plan of Henan University of Technology(No.2022ZKCJ01)。

摘　　要：Carbon dots(CDs),due to their low cost,high stability,and high luminous efficiency,have emerged as an excellent material for the emissive layer in next-generation electroluminescent light-emitting diodes(ELEDs).However,improving the efficiency of fluorescent CDs-based ELEDs remains challenging,primarily because it is difficult to utilize triplet excitons in the electroluminescence process.Therefore,enhancing the exciton utilization efficiency of CDs during electroluminescence is crucial.Based on this,we exploited the characteristic large exciton binding energy commonly found in CDs to develop exciton-emitting CDs.These CDs facilitate the radiative recombination of excitons during electroluminescence,thereby improving the electroluminescent efficiency.By rationally selecting precursors,we developed high quantum efficiency CDs and subsequently constructed CDs-based ELEDs.The blue-light device exhibited an external quantum efficiency of over 4%.This study introduces a novel design concept for CDs,providing a new strategy for developing high-performance blue ELEDs based on CDs.

关 键 词：Carbon dots ELECTROLUMINESCENCE Controllable preparation Exciton emission Light-emitting diodes 

分 类 号：TN383.1[电子电信—物理电子学] TB383.1[一般工业技术—材料科学与工程]