Role of Conjugated Structure of Cross-linkers in Patterned QLEDs

IF 9.6 1区材料科学 Q1 CHEMISTRY, MULTIDISCIPLINARY

Nano Letters Pub Date : 2025-06-18 DOI:10.1021/acs.nanolett.5c01926

Jung-Min Kim, Donghyun Choi, Namji Lee, Weon-Sik Chae, Hae-Sik Kim, Jeong Hwan Yu, Jong-Soo Lee

引用次数: 0

Abstract

Direct optical lithography is a promising method for the high-resolution patterning of colloidal quantum dots (CQDs) in optoelectronic devices. However, this approach requires photo-cross-linkers that ensure strong chemical binding without degrading CQD ligands, while also supporting efficient charge transport. In this study, we compare two cross-linkers, 4,4′-thiobisbenzenethiol (TBBT) and biphenyl-4,4′-dithiol (BPDT), to evaluate their impact on CQD optoelectronic performance. Density functional theory (DFT) calculations reveal that the biphenyl structure of BPDT enables greater π-orbital overlap and a narrower bandgap than TBBT, which contains sulfur-conjugated units. As a result, BPDT enhances charge injection, preserves photoluminescence, and improves the external quantum efficiency of patterned CQD light-emitting diodes. These findings provide molecular-level insight into cross-linker design strategies for efficient, high-resolution patterning of CQD-based optoelectronics.

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交联剂共轭结构在图案qled中的作用

直接光学光刻是光电子器件中胶体量子点（CQDs）高分辨率图像化的一种很有前途的方法。然而，这种方法需要光交联剂，以确保强化学结合而不降解CQD配体，同时还支持有效的电荷传输。在这项研究中，我们比较了两种交联剂，4,4 ' -硫代双硫醇（TBBT）和联苯-4,4 ' -二硫醇（BPDT），以评估它们对CQD光电性能的影响。密度泛函理论（DFT）计算表明，BPDT的联苯结构比含硫共轭单元的TBBT具有更大的π-轨道重叠和更窄的带隙。结果表明，BPDT增强了电荷注入，保持了光致发光，提高了图像化CQD发光二极管的外量子效率。这些发现为基于cqd的光电子学的高效、高分辨率模式的交联设计策略提供了分子水平的见解。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Nano Letters 工程技术-材料科学：综合

CiteScore

16.80

自引率

2.80%

发文量

1182

审稿时长

1.4 months

期刊介绍： Nano Letters serves as a dynamic platform for promptly disseminating original results in fundamental, applied, and emerging research across all facets of nanoscience and nanotechnology. A pivotal criterion for inclusion within Nano Letters is the convergence of at least two different areas or disciplines, ensuring a rich interdisciplinary scope. The journal is dedicated to fostering exploration in diverse areas, including: - Experimental and theoretical findings on physical, chemical, and biological phenomena at the nanoscale - Synthesis, characterization, and processing of organic, inorganic, polymer, and hybrid nanomaterials through physical, chemical, and biological methodologies - Modeling and simulation of synthetic, assembly, and interaction processes - Realization of integrated nanostructures and nano-engineered devices exhibiting advanced performance - Applications of nanoscale materials in living and environmental systems Nano Letters is committed to advancing and showcasing groundbreaking research that intersects various domains, fostering innovation and collaboration in the ever-evolving field of nanoscience and nanotechnology.