Scholarlink

<p>Cadmium-based (Cd-based) quantum dots (QDs) have emerged as pivotal materials in display technology due to their wide color gamut and narrow full-width at half-maximum (FWHM). However, conventional CdSe/ZnS core–shell QDs often suffer from surface defects induced by lattice strain and aggregation-induced quenching during the film-forming process. To address these issues, this study proposes a dual-functional ligand modification strategy using thiol and carboxyl groups. By leveraging the strong coordination between the thiol groups (-SH) and surface metal ions, we effectively passivated trap states; simultaneously, the steric hindrance provided by the carboxyl terminals improved compatibility, significantly reducing aggregation during film formation. This multifunctional modification optimizes the surface chemical microenvironment of the QDs, substantially suppressing non-radiative recombination and enhancing the optical performance of the resulting thin films. Furthermore, the CdSe/ZnS QDs utilized in this research contain significantly lower cadmium levels compared to traditional binary CdSe/CdS QDs, thereby mitigating the risk of cadmium contamination in the final product. The paper then introduces a method for fabricating quantum dot color conversion films using photolithography, blending modified QDs with an acrylate-based photoresist to create precisely controllable films between 2 and 5&#xa0;µm in thickness. Using the LightTools optical simulation platform, the research systematically analyzed how film thickness and quantum dot weight fraction impact light conversion efficiency, establishing a quantitative relationship. The paper results show that this strategy significantly improves the film’s performance, a 5.12&#xa0;μm film using red QDs (initial PLQY of 96.54%) reached a photoluminescence quantum yield (PLQY) of 88.16% after incorporation of 10 wt% nano-TiO<sub>2</sub>, retaining 91.3% of the original efficiency. Similarly, a 4.63-μm-thick film made with green QDs (initial PLQY of 78.27%) achieved a PLQY of 66.64%, retaining 85.14% of its original efficiency. This technology also allows for the creation of intricate patterns as small as 20&#xa0;μm.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Controlled fabrication and performance analysis of high-efficiency color-conversion films based on CdSe/ZnS quantum dots with thiol-carboxylate bidentate ligands

  • 期刊论文

  • 发表日期：

    2026年2月9日

查看全文
  • Haonan Zhu,
  • Chenliang Liu,
  • Shuchen Weng,
  • Xiongtu Zhou,
  • Tailiang Guo,
  • Yongai Zhang

摘要

Cadmium-based (Cd-based) quantum dots (QDs) have emerged as pivotal materials in display technology due to their wide color gamut and narrow full-width at half-maximum (FWHM). However, conventional CdSe/ZnS core–shell QDs often suffer from surface defects induced by lattice strain and aggregation-induced quenching during the film-forming process. To address these issues, this study proposes a dual-functional ligand modification strategy using thiol and carboxyl groups. By leveraging the strong coordination between the thiol groups (-SH) and surface metal ions, we effectively passivated trap states; simultaneously, the steric hindrance provided by the carboxyl terminals improved compatibility, significantly reducing aggregation during film formation. This multifunctional modification optimizes the surface chemical microenvironment of the QDs, substantially suppressing non-radiative recombination and enhancing the optical performance of the resulting thin films. Furthermore, the CdSe/ZnS QDs utilized in this research contain significantly lower cadmium levels compared to traditional binary CdSe/CdS QDs, thereby mitigating the risk of cadmium contamination in the final product. The paper then introduces a method for fabricating quantum dot color conversion films using photolithography, blending modified QDs with an acrylate-based photoresist to create precisely controllable films between 2 and 5 µm in thickness. Using the LightTools optical simulation platform, the research systematically analyzed how film thickness and quantum dot weight fraction impact light conversion efficiency, establishing a quantitative relationship. The paper results show that this strategy significantly improves the film’s performance, a 5.12 μm film using red QDs (initial PLQY of 96.54%) reached a photoluminescence quantum yield (PLQY) of 88.16% after incorporation of 10 wt% nano-TiO2, retaining 91.3% of the original efficiency. Similarly, a 4.63-μm-thick film made with green QDs (initial PLQY of 78.27%) achieved a PLQY of 66.64%, retaining 85.14% of its original efficiency. This technology also allows for the creation of intricate patterns as small as 20 μm.