Shuyan Fang, Zhichao Chen, Xuanang Luo, Chenhui Su, Lei Ying, Shijian Su, Jibin Zhang, Ziyang Hu, Lintao Hou
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引用次数: 0
Abstract
The performance of perovskite light-emitting diodes (PeLEDs) has advanced rapidly; however, the development of suitable hole transport layers (HTLs) for PeLEDs remains a critical challenge. This study introduces a multifunctional HTL of poly[(9,9-dioctylfluorenyl-2,7-diyl)-alt-(4,4′-(N-(4-[2-[2-(2-methoxyethoxy)ethoxy]ethoxy]phenyl)diphenylamine))] (TFTEG), which features a backbone similar to that of the commercial hole transport material poly[(9,9-dioctylfluorenyl-2,7-diyl)-alt-(4,4′-(N-(4-sec-butylphenyl)diphenylamine))] (TFB), while its side chain is modified to include multiple ether groups. Theoretical calculations and experimental characterizations demonstrate that TFTEG not only significantly enhances hole injection but also effectively passivates uncoordinated Pb2+ defects at the buried interface through Lewis acid–base interactions. This substantially improves the photoluminescence and electroluminescence (EL) quantum yields of perovskite quantum dots (QDs). Pure-red quantum-dot PeLEDs that employ TFTEG as the HTL achieve a maximum external quantum efficiency of 9.67%, which signifies a substantial enhancement over the 4.56% efficiency observed in control devices utilizing the commercial TFB HTL. Furthermore, TFTEG contributes to a reduced turn-on voltage, enhanced brightness (1741 vs 888 cd m−2), and a stable EL spectrum peaking at 650 nm. The rapid response characteristics underscore its promising potential for high-speed optoelectronic applications, such as wireless communication systems.
期刊介绍:
Applied Physics Letters (APL) features concise, up-to-date reports on significant new findings in applied physics. Emphasizing rapid dissemination of key data and new physical insights, APL offers prompt publication of new experimental and theoretical papers reporting applications of physics phenomena to all branches of science, engineering, and modern technology.
In addition to regular articles, the journal also publishes invited Fast Track, Perspectives, and in-depth Editorials which report on cutting-edge areas in applied physics.
APL Perspectives are forward-looking invited letters which highlight recent developments or discoveries. Emphasis is placed on very recent developments, potentially disruptive technologies, open questions and possible solutions. They also include a mini-roadmap detailing where the community should direct efforts in order for the phenomena to be viable for application and the challenges associated with meeting that performance threshold. Perspectives are characterized by personal viewpoints and opinions of recognized experts in the field.
Fast Track articles are invited original research articles that report results that are particularly novel and important or provide a significant advancement in an emerging field. Because of the urgency and scientific importance of the work, the peer review process is accelerated. If, during the review process, it becomes apparent that the paper does not meet the Fast Track criterion, it is returned to a normal track.