Reducing the impact of Auger recombination in quasi-2D perovskite light-emitting diodes

Yuanzhi Jiang, Minghuan Cui, Saisai Li, Changjiu Sun, Yanmin Huang, Junli Wei, Li Zhang, Mei Lv, Chaochao Qin (), Yufang Liu and Mingjian Yuan ()
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Yuanzhi Jiang: Nankai University
Minghuan Cui: Henan Normal University
Saisai Li: Nankai University
Changjiu Sun: Nankai University
Yanmin Huang: Nankai University
Junli Wei: Nankai University
Li Zhang: Nankai University
Mei Lv: Nankai University
Chaochao Qin: Henan Normal University
Yufang Liu: Henan Normal University
Mingjian Yuan: Nankai University

Nature Communications, 2021, vol. 12, issue 1, 1-10

Abstract: Abstract Rapid Auger recombination represents an important challenge faced by quasi-2D perovskites, which induces resulting perovskite light-emitting diodes’ (PeLEDs) efficiency roll-off. In principle, Auger recombination rate is proportional to materials’ exciton binding energy (Eb). Thus, Auger recombination can be suppressed by reducing the corresponding materials’ Eb. Here, a polar molecule, p-fluorophenethylammonium, is employed to generate quasi-2D perovskites with reduced Eb. Recombination kinetics reveal the Auger recombination rate does decrease to one-order-of magnitude lower compared to its PEA+ analogues. After effective passivation, nonradiative recombination is greatly suppressed, which enables resulting films to exhibit outstanding photoluminescence quantum yields in a broad range of excitation density. We herein demonstrate the very efficient PeLEDs with a peak external quantum efficiency of 20.36%. More importantly, devices exhibit a record luminance of 82,480 cd m−2 due to the suppressed efficiency roll-off, which represent one of the brightest visible PeLEDs yet.

Date: 2021
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DOI: 10.1038/s41467-020-20555-9

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