Author(s): Xie, MY (Xie, Mingyuan); Guo, J (Guo, Jie); Zhang, XY (Zhang, Xiaoyu); Bi, CH (Bi, Chenghao); Zhang, L (Zhang, Lin); Chu, ZM (Chu, Zema); Zheng, WT (Zheng, Weitao); You, JB (You, Jingbi); Tian, JJ (Tian, Jianjun)

Source: NANO LETTERS DOI: 10.1021/acs.nanolett.2c03062 Early Access Date: OCT 2022

Abstract: It is still challenging to achieve high-efficiency pure -red (620-650 nm wavelength) perovskite light-emitting diodes (PeLEDs). Herein, we report pure-red PeLEDs with Commission Internationale de l'Eclairage coordinates (0.703, 0.297) meeting the Rec. 2020, an external quantum efficiency of 20.8%, and a luminance of 3775 cd/m2. This design is based on the strong quantum confinement CsPbI3 quantum dots (QDs) capped by composite ligands of 3-phenyl-1-propylamine and tetrabutylammonium iodide. This strategy stabilized the structure of the strong-confined QDs and reduced the influence of the electric field-induced Stark effect on the PeLEDs. Furthermore, the exciton binding energy of the QDs was decreased by the composited ligands to suppress Auger recombi-nation within the devices. Additionally, the valence-band maximum of the QDs was lifted to match the hole-transport layer, thus balancing charge injection in the PeLEDs. Our device also demonstrated a stable electroluminescence spectrum and a lifetime of 5.6 times longer than the control device.

Accession Number: WOS:000873803600001

PubMed ID: 36251485

Author Identifiers:

Author        Web of Science ResearcherID        ORCID Number

Zhang, Xiaoyu                  0000-0001-7528-4405

Tian, Jianjun         A-8647-2013         0000-0002-4008-0469

You, Jingbi         A-2941-2011         0000-0002-4651-9081

ISSN: 1530-6984

eISSN: 1530-6992

Full Text: https://pubs.acs.org/doi/10.1021/acs.nanolett.2c03062