Sulfur‐Bridged Pure Organic Ester Clusters Exhibiting Near‐Infrared Fluorescence

作者：Xiong Liu, Jiafang Guo, Zuping Xiong, Xiang Li, Yanbing Lv, Ziteng Zhang, Bo Chu, Haoke Zhang, Jing Sun, Xinghong Zhang, Ben Zhong Tang · 发表于：Advanced Functional Materials · 年份：2025 · DOI：10.1002/adfm.202420830 · 被引用次数：20 · 研究领域：Luminescence and Fluorescent Materials、Organic Light-Emitting Diodes Research、Fluorine in Organic Chemistry

Abstract The development of near‐infrared (NIR) luminophores offers significant potential in the life sciences, yet constructing pure organic clusteroluminescence (CL) from nonconjugated polymers via through‐space interaction (TSI) remains a substantial challenge. Herein, it is revealed that sulfur (S) functions as a bridge between isolated ester groups in small molecule models, facilitating ( n , π*) transitions. Building on this, RCP1 ‐ RCP5 and P1 ‐ P4 are synthesized to produce pure organic NIR‐CL luminophores. The introduction of S enhances chain clustering in polyesters and modulates inter‐/intra‐chain TSI, while micro‐folding within chains promotes clustering of adjacent ester groups and S atoms, resulting in a marked redshift. Notably, P4 displayed a fluorescence peak at 800 nm, extending to 883 nm, which sets a new record for CL. Additionally, full‐color fluorescent fibers are fabricated and explored the application of clusteroluminescent dyes. This work deepens the understanding of CL mechanisms and provides critical insights for developing high‐efficiency organic clusteroluminescent materials.