Enhanced Electrochemical Stability by Alkyldiammonium in Dion–Jacobson Perovskite toward Ultrastable Light‐Emitting Diodes

Kwan Ho Ngai; Qi Wei; Zefeng Chen; Xinlu Guo; Minchao Qin; Fangyan Xie; Christopher Chang Sing Chan; Guichuan Xing; Xinhu Lu; Jian Chen; Kam Sing Wong; Jianbin Xu; Mingzhu Long

doi:10.1002/adom.202100243

journal article·2021-08

Enhanced Electrochemical Stability by Alkyldiammonium in Dion–Jacobson Perovskite toward Ultrastable Light‐Emitting Diodes

Kwan Ho Ngai, Qi Wei, Zefeng Chen, Xinlu Guo, Minchao Qin, Fangyan Xie, Christopher Chang Sing Chan, Guichuan Xing, Xinhu Lu, Jian Chen, Kam Sing Wong, Jianbin Xu, Mingzhu Long

Advanced Optical Materials· Volume 9· Issue 15

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Source abstract

Abstract

Abstract The electroluminescence efficiency of perovskite light‐emitting diodes (PeLEDs) has gained notable achievements, but the poor stability under electric stress severely impedes future practical use. Here, an alkyldiammonium 1,4‐butanediamine (BDA) is incorporated into perovskite emitting layer, which substantially optimizes electrochemical stability and minimizes interfacial deep traps under large external bias. The BDA‐PeLED shows a record operational half‐lifetime T₅₀ of 189.4 h at a high current density of 100 mA cm⁻² and 681 h under 50 mA cm⁻². Additionally, the device maintains its original performance upon 2500 cycles of voltage scan and withstands 10 000 times of ON–OFF under a pulsed voltage of 2.5 V. Further degradation mechanism study reveals that the main origins of the instability property of PeLEDs without BDA are the generation of deep traps at the interfaces and the infiltration of anions into adjacent layers under long‐term electric stress. The significantly enhanced electrochemical stability suggests that alkyldiammonium cation incorporation can provide a direction to solve the instability issue of PeLEDs.

Source: crossref · Quality: baseline

Research context

Electronic materials

OpenAlex topics: Perovskite Materials and Applications · Organic Light-Emitting Diodes Research · Quantum Dots Synthesis And Properties

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Department of Electronic Engineering The Chinese University of Hong Kong Hong Kong 999077 China

Joint Key Laboratory of the Ministry of Education Institute of Applied Physics and Materials Engineering University of Macau Macau SAR 999078 China

Department of Physics The Chinese University of Hong Kong Hong Kong 999077 China

State Key Laboratory of Optoelectronic Materials and Technologies Sun Yat‐sen University Guangzhou Guangdong 510275 China

Department of Physics Hong Kong University of Science and Technology Clear Water Bay Hong Kong 999077 China

Guangdong Provincial Key Laboratory of Optical Information Materials and Technology Institute of Electronic Paper Displays South China Academy of Advanced Optoelectronics South China Normal University Guangzhou 510006 China

Funding

Innovation and Technology Commission · National Natural Science Foundation of China

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