Reducing the Impact of Auger Recombination in Quasi-2D Perovskite Light-emitting Diodes

Overview

Journal Nat Commun

Specialty Biology

Date 2021 Jan 13

PMID 33436618

Citations 37

Authors

Yuanzhi Jiang

Minghuan Cui

Saisai Li

Changjiu Sun

Yanmin Huang

Junli Wei

Li Zhang

Mei Lv

Chaochao Qin

Yufang Liu

Mingjian Yuan

Affiliations

Soon will be listed here.

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 (E). Thus, Auger recombination can be suppressed by reducing the corresponding materials' E. Here, a polar molecule, p-fluorophenethylammonium, is employed to generate quasi-2D perovskites with reduced E. 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 due to the suppressed efficiency roll-off, which represent one of the brightest visible PeLEDs yet.

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