Jump to main content
Jump to site search


Improved current efficiency of quasi-2D multi-cation perovskite light-emitting diodes: the effect of Cs and K

Author affiliations

Abstract

Multiple cation-substitution is an effective method to improve the stability of organic–inorganic hybrid perovskite thin-films. Here, we apply this approach to quasi two-dimensional (quasi-2D) perovskite materials, and investigate the effect of Cs and K doping on the performance of quasi-2D perovskite LEDs (PeLEDs). It is found that Cs significantly reduces the efficiency roll-off of quasi-2D PLEDs at high current density, which leads to a high current efficiency (CE) – even at an operation current density as high as 1000 mA cm−2. In addition, the incorporation of a small amount of K further increases the device quantum efficiency thanks to its passivation effect. As a result, our green PeLED, which is based on a multi-cation quasi-2D perovskite, reaches a brightness of 45 600 cd m−2, and a maximum CE of 22.5 cd A−1. The approach introduced in this work has great potential to enhance the performance of quasi-2D perovskite light-emitting diodes.

Graphical abstract: Improved current efficiency of quasi-2D multi-cation perovskite light-emitting diodes: the effect of Cs and K

Back to tab navigation

Supplementary files

Article information


Submitted
08 Oct 2019
Accepted
16 Nov 2019
First published
19 Nov 2019

Nanoscale, 2020, Advance Article
Article type
Paper

Improved current efficiency of quasi-2D multi-cation perovskite light-emitting diodes: the effect of Cs and K

G. Yang, X. Liu, Y. Sun, C. Teng, Y. Wang, S. Zhang and H. Zhou, Nanoscale, 2020, Advance Article , DOI: 10.1039/C9NR08616A

Social activity

Search articles by author

Spotlight

Advertisements