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Issue 3, 2020
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Improved current efficiency of quasi-2D multi-cation perovskite light-emitting diodes: the effect of Cs and K

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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

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

Nanoscale, 2020,12, 1571-1579
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, 12, 1571
DOI: 10.1039/C9NR08616A

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