Reduction of aggregation in NIR-absorbing films with heptamethine cyanine dyes through steric hindrance and polymer interaction

IF 6.5 2区材料科学 Q1 CHEMISTRY, APPLIED Progress in Organic Coatings Pub Date : 2025-02-17 DOI:10.1016/j.porgcoat.2025.109139

Dong Jun Lee , Hyun Kyu Lee , Jun Ho Yoon , Hong Mo Kim , Woo Jin Choi , Suhyeon Kim , Wan Soo Kim , Yoo Sang Kim , Seong Hyun Jang , Chaelin Park , Tae Gyu Hwang , Jae Pil Kim

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Abstract

Near-infrared (NIR) absorbing films are essential components of CMOS image sensors. To address aggregation issues in benzo[cd]indolenyl-substituted heptamethine cyanines, we synthesized four derivatives with meso-position substituents designed to increase steric hindrance and enhance polymer interactions. These modifications effectively reduced aggregation and improved film performance. Cyanine dyes with stronger steric hindrance (e.g., Cy-5eB) mitigated aggregation in polystyrene (PS) films, while those with stronger polymer interactions (e.g., Cy-5caB) performed better in cyclic olefin polymer (COP) films. Furthermore, Cy-5caB exhibited enhanced thermal stability in COP films, indicating that increasing polymer interactions not only reduces aggregation but also improves thermal stability.

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来源期刊

Progress in Organic Coatings 工程技术-材料科学：膜

CiteScore

11.40

自引率

15.20%

发文量

577

审稿时长

48 days

期刊介绍： The aim of this international journal is to analyse and publicise the progress and current state of knowledge in the field of organic coatings and related materials. The Editors and the Editorial Board members will solicit both review and research papers from academic and industrial scientists who are actively engaged in research and development or, in the case of review papers, have extensive experience in the subject to be reviewed. Unsolicited manuscripts will be accepted if they meet the journal''s requirements. The journal publishes papers dealing with such subjects as: • Chemical, physical and technological properties of organic coatings and related materials • Problems and methods of preparation, manufacture and application of these materials • Performance, testing and analysis.