Surface-Ligand-Modified CdSe/CdS Nanorods for High-Performance Light-Emitting Diodes

Zhang, Hui1,2; Mi, Xiaohu3,4; Kang, Bowen3; Wu, Yunkai5; Zhang, Tingting3; Liu, Pai6; Sun, Xiaowei6; Zhang, Zhenglong3; Liu, Ning1,2; Xu, Hongxing6,7

2023

10.1021/acsomega.2c05730

ACS Omega   影响因子和分区

2470-1343

Colloidal nanocrystals (NCs) play an important role in the field of optoelectronic devices such as photovoltaic cells, photodetectors, and light-emitting diodes (LEDs). The properties of NC films are strongly affected by ligands attached to them, which constitute a barrier for charge transport between adjacent NCs. Therefore, the method of surface modification by ligand exchange has been used to improve the electrical conductivity of NC films. However, surface modification to NCs in LEDs can also affect emission characteristics. Among NCs, nanorods have unique properties, such as suppression of nonradiative Auger recombina-tion and linearly polarized light emission. In this work, CdSe/CdS nanorods (NRs) were prepared by the hot injection method. To increase the charge transport into CdSe/CdS NRs, we adopted ligand modification to CdSe/CdS NRs. Using this technique, we could shorten the injection barrier length between CdSe/CdS NRs and adjacent layers. It leads to a more balanced charge injection of electron/hole and a greatly increased current efficiency of CdSe/CdS NR-LEDs. In the NR-LEDs, the ligand exchange boosted the electroluminance, reaching a sixfold increase from 848 cd/m2 of native surfactants to 5600 cd/m2 of the exchanged n-octanoic acid ligands at 12 V. The improvement of CdSe/CdS NR-LED performance is closely correlated to the efficient control of charge balance via ligand modification strategy, which is expected to be indispensable to the future NR-LED-based optoelectronic system.

SCI

英语

通讯

Science Foundation Ireland Career Development Award[SFI 17/CDA/4733] ; National Natural Science Foundation of China[92150110] ; Natural Key R&D Program of China["2020YFA0211300","2021YFA1201500"] ; Fundamental Research Funds for Central Universities["GK202201012","SYJS202222"]

Chemistry

Chemistry, Multidisciplinary

WOS:000923220300001

AMER CHEMICAL SOC

Web of Science

1.Univ Limerick, Dept Phys, Limerick V94 T9PX, Ireland
2.Univ Limerick, Bernal Inst, Limerick V94T9PX, Ireland
3.Shaanxi Normal Univ, Sch Phys & Informat Technol, Xian 710119, Peoples R China
4.Shaanxi Univ Tradit Chinese Med, Key Lab Acupuncture & Drug Combinat, Xianyang 712044, Peoples R China
5.Guizhou Univ, Coll Big Data & Informat Engn, Guiyang 550025, Peoples R China
6.Southern Univ Sci & Technol, Inst Nanosci & Applicat, Shenzhen 518055, Peoples R China
7.Wuhan Univ, Sch Phys & Technol, Wuhan 430072, Peoples R China

Zhang, Hui,Mi, Xiaohu,Kang, Bowen,et al. Surface-Ligand-Modified CdSe/CdS Nanorods for High-Performance Light-Emitting Diodes[J]. ACS Omega,2023.

Zhang, Hui.,Mi, Xiaohu.,Kang, Bowen.,Wu, Yunkai.,Zhang, Tingting.,...&Xu, Hongxing.(2023).Surface-Ligand-Modified CdSe/CdS Nanorods for High-Performance Light-Emitting Diodes.ACS Omega.

Zhang, Hui,et al."Surface-Ligand-Modified CdSe/CdS Nanorods for High-Performance Light-Emitting Diodes".ACS Omega (2023).