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

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 1000mA/cm2. 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 45600cd/m2, and a maximum CE of 22.5cd/A. The approach introduced in this work has a great potential to enhance the performance of quasi-2D perovskite light-emitting diodes.

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Publication details

The article was received on 08 Oct 2019, accepted on 16 Nov 2019 and first published on 19 Nov 2019


Article type: Paper
DOI: 10.1039/C9NR08616A
Nanoscale, 2019, Accepted Manuscript

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    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, 2019, Accepted Manuscript , DOI: 10.1039/C9NR08616A

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