Red Perovskite Light-Emitting Diodes with Efficiency Exceeding 25% Realized by Co-Spacer Cations
Author(s): Jiang, J (Jiang, Ji); Chu, ZM (Chu, Zema); Yin, ZG (Yin, Zhigang); Li, JZ (Li, Jingzhen); Yang, YG (Yang, Yingguo); Chen, JR (Chen, Jingren); Wu, JL (Wu, Jinliang); You, JB (You, Jingbi); Zhang, XW (Zhang, Xingwang)
Source: ADVANCED MATERIALS Article Number: 2204460 DOI: 10.1002/adma.202204460 Early Access Date: AUG 2022
Abstract: Perovskite light-emitting diodes (PeLEDs) have received great attention in recent years due to their narrow emission bandwidth and tunable emission spectrum. Efficient red emission is one of most important parts for lighting and displays. Quasi-2D perovskites can deliver high emission efficiency due to the strong carrier confinement, while the external quantum efficiencies (EQE) of red quasi-2D PeLEDs are inefficient at present, which is due to the complex distribution of different n-value phases in quasi-2D perovskite films. In this work, the phase distribution of the quasi-2D perovskite is finely controlled by mixing two different large organic cations, which effectively reduces the amount of smaller n-index phases, meanwhile the passivation of lead and halide defects in perovskite films is realized. Accordingly, the PeLEDs show 25.8% EQE and 1300 cd m(-2) maximum brightness at 680 nm, which exhibits the highest performance for red PeLEDs up to now.
Accession Number: WOS:000837201800001
PubMed ID: 35855612
Author Identifiers:
Author Web of Science ResearcherID ORCID Number
You, Jingbi A-2941-2011 0000-0002-4651-9081
Yang, Yingguo 0000-0002-1749-2799
ISSN: 0935-9648
eISSN: 1521-4095
Full Text: https://onlinelibrary.wiley.com/doi/10.1002/adma.202204460