journal article·2024-05

Heterocyclic Diammonium Dion‐Jacobson Perovskite Blue Light‐Emitting Diodes with Nonshift Emission Peak Under High Bias Voltage

Shibing Zou, Kezhou Fan, Xiao Wu, Ligang Yuan, Jiarong Wang, Kangyang Wang, Jiong Li, Jianwu Wei, Shuang Xu, Feilin Zou, Kam Sing Wong, Xinhui Lu, Jianbin Xu, Keyou Yan

Advanced Optical Materials· Volume 12· Issue 14
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Abstract

Abstract The emission peak shift caused by ion motion, especially under high bias voltage, is an obstacle to the development of blue perovskite light‐emitting diodes (PeLEDs). In this work, 3‐Aminopiperidine dihydrochloride (3AP) to construct heterocyclic dication Dion‐Jacobson (DJ) PeLEDs is introduced, and found that 3AP incorporation can retard the halide segregation and chloride loss, leading to the improvement of the emission spectral stability. By increasing the amount of 3AP (DJ phase), emission centers can be tuned from green to blue but the excitonic peak abnormally disappears, indicative of exciton delocalization. Photoluminescence quantum yield (PLQY) and ultrafast spectroscopy indicated that the introduction of 3AP can passivate defects and control the exciton delocalization to facilitate interlayer charge transfer. The external quantum efficiencies (EQE) of the obtained green (513 nm), sky blue (488 nm), and blue (478 nm) PeLEDs reached 3.0%, 7.1%, and 4.8%, respectively, and the maximum luminance is 10956, 1093 and 782 cd m−2, respectively. Most importantly, under high operating voltages from 3 to 10 V, the PeLEDs delivered outstanding spectral stability free of peak shift.
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Research context

OpenAlex topics: Perovskite Materials and Applications · Organic Light-Emitting Diodes Research · Conducting polymers and applications

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

Affiliations

School of Environment and Energy State Key Laboratory of Luminescent Materials and Devices Guangdong Provincial Key Laboratory of Solid Wastes Pollution Control and Recycling South China University of Technology Guangzhou 510000 P. R. China

Department of Physics and William Mong Institute of Nano Science and Technology The Hong Kong University of Science and Technology Clear Water Bay, Kowloon Hong Kong 999077 P. R. China

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

School of Chemistry and Chemical Engineering Guangxi Key Laboratory of Electrochemical Energy Materials Guangxi University Nanning 530004 P. R. China

Department of Electronic Engineering The Chinese University of Hong Kong Shatin, New Territories Hong Kong 999077 P. R. China

Funding

National Key Research and Development Program of China · National Natural Science Foundation of China · Fundamental Research Funds for the Central Universities

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