High-performing organic/quantum dot hybrid upconversion device based on a single-component near-infrared-sensitive layer

IF 3.5 2区物理与天体物理 Q2 PHYSICS, APPLIED Applied Physics Letters Pub Date : 2024-09-10 DOI:10.1063/5.0228406

Ke Wang, Yuanhong Hu, Lixiang Chen, Haijun Jiang, Haohong Jiang, Xingwen Tan, Qiaoming Zhang, Yanlian Lei

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Abstract

A donor/acceptor (D/A) heterojunction with an interfacial energetic offset is demonstrated to enable efficient exciton dissociation in organic photodetectors and upconversion devices (UCDs). Unfortunately, this approach usually encounters complicated optimization procedures and interfacial instability. Herein, we present an alternative strategy for achieving high-performing UCDs by utilizing an organic single-component near-infrared (NIR)-sensitive layer instead of a D/A heterojunction. The showcased UCD is constructed by vertically stacking an organic single-component Y6 NIR-detection unit and a quantum dot light-emitting unit. Due to the high dielectric constant and low exciton binding energy of the non-fullerene acceptor Y6, free carriers are directly and spontaneously generated upon NIR light excitation. As a result, the single-component UCD achieves a low light detection capability of 2.5 μW/cm2, a fast refresh rate of >3.8 × 104, and a high resolution exceeding 1100 dpi, providing a stable optical response to high-frequency NIR signals and high-quality NIR imaging.

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基于单组分近红外敏感层的高性能有机/量子点混合上转换器件

研究表明，具有界面能量偏移的供体/受体（D/A）异质结能够在有机光电探测器和上转换器件（UCD）中实现高效的激子解离。遗憾的是，这种方法通常会遇到复杂的优化程序和界面不稳定性。在此，我们提出了一种实现高性能 UCD 的替代策略，即利用有机单组分近红外（NIR）敏感层代替 D/A 异质结。展示的 UCD 是通过垂直堆叠有机单组分 Y6 近红外探测单元和量子点发光单元而构建的。由于非富勒烯受体 Y6 具有高介电常数和低激子结合能，因此在近红外光激发下可直接自发产生自由载流子。因此，单组分 UCD 实现了 2.5 μW/cm2 的低光探测能力、>3.8 × 104 的快速刷新率和超过 1100 dpi 的高分辨率，为高频近红外信号和高质量近红外成像提供了稳定的光学响应。

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来源期刊

Applied Physics Letters 物理-物理：应用

CiteScore

6.40

自引率

10.00%

发文量

1821

审稿时长

1.6 months

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.