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硫掺杂策略促进碳点余辉复合体热激活延迟荧光
首发时间：2024-05-28
摘要：碳点余辉材料因其超长的发光寿命和大的斯托克斯位移，在传感、防伪、生物成像和光电子设备等领域展现出巨大的应用潜力。本论文使用一种简便的溶剂热法制备了紫外光激发的高效长余辉碳点复合材料，并进一步研究总结了s掺杂策略对余辉性能的调控作用。通过简单的基质辅助固定策略，加热碳点和硼酸的混合溶液，将碳点的发光中心嵌入偏硼酸多晶基质，制备了碳点余辉复合材料hcds@ba。采用s元素掺杂策略，大幅缩小了三重态能隙，进而促进了系间窜越(isc)与反系间窜越(risc)过程，增强了热激活延迟荧光(tadf)，实现了tadf与室温磷光(rtp)的高效双模发射。本工作为碳点余辉材料的性能调控，提供了示例与借鉴。
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sulfur doping strategy to promote thermally activated delayed fluorescence of carbon dot afterglow composites
abstract：carbon dot afterglow materials have shown great potential in fields such as sensing, anti-counterfeiting, bioimaging, and optoelectronic devices due to their ultra-long luminescence lifetime and large stokes shift. in this paper, we prepared an efficient ultraviolet (uv) light-activated long afterglow carbon dot composite material using a simple solvothermal method and further studied the role of sulfur doping strategy in regulating the afterglow performance. by employing a simple matrix-assisted immobilization strategy, we heated a mixed solution of carbon dots and boric acid to embed the luminescent centers of carbon dots into a metaborate polycrystalline matrix, resulting in the preparation of carbon dot afterglow composite material hcds@ba. the use of sulfur doping strategy significantly narrowed the triplet energy gap, thereby promoting the intersystem crossing (isc) and reverse intersystem crossing (risc) processes, enhancing thermally activated delayed fluorescence (tadf), and achieving efficient dual-mode emission of tadf and room temperature phosphorescence (rtp). this work provides an example and reference for the performance regulation of carbon dot afterglow materials.
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硫掺杂策略促进碳点余辉复合体热激活延迟荧光
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