Deep Red Emissive Carbonized Polymer Dots with Unprecedented Narrow Full Width at Half Maximum
Deep Red Emissive Carbonized Polymer Dots with Unprecedented Narrow Full Width at Half Maximum
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深红色发光碳化聚合物点，具有前所未有的窄半峰宽
DOI：
10.1002/adma.201906641
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发表时间：
2020-03-19
影响因子：
29.4
通讯作者：
Yang, Bai
中科院分区：
文献类型：
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作者：
Liu, Junjun;Geng, Yijia;Yang, Bai
开发发射波长大于660 nm（深红色发射）的高性能碳量子点（CD）在深层组织生物成像中至关重要，然而获得既具有窄的半高宽（FWHM）又具有高的深红色/近红外发射产率的CD仍然是一个主要挑战。在这里，深红色发光聚合物点（CPD）与前所未有的FWHM为20 nm的合成。在413 nm激发下，CPDs的量子产率（QY）高达59%，在660 nm激发下，CPDs的量子产率为31%。详细的表征表明，CPD具有独特的聚合物特性，由碳核和聚合物链的壳层组成，由N杂环和芳环形成的π共轭体系控制着单一的光致发光（PL）中心，这是导致具有窄半高宽的深红色发光CPD具有高QY的原因。CPD在深红光区具有很强的吸收和发射，毒性低，生物相容性好，使其成为单光子和双光子生物成像的有效探针。CPD通过肾脏系统和肝胆系统快速排泄。
Development of high-performance carbon dots (CDs) with emission wavelength longer than 660 & x202f;nm (deep red emission) is critical in deep-tissue bioimaging, yet it is still a major challenge to obtain CDs with both narrow full width at half maximum (FWHM) and high deep red/near-infrared emission yield. Here, deep red emissive carbonized polymer dots (CPDs) with unprecedented FWHM of 20 nm are synthesized. The purified CPDs in dimethyl sulfoxide (DMSO) solution possess quantum yield (QY) as high as 59% under 413 nm excitation, as well as recorded QY of 31% under 660 nm excitation in the deep red fluorescent window. Detailed characterizations identify that CPDs have unique polymer characteristics, consisting of carbon cores and the shells of polymer chains, and pi conjugated system formed with N heterocycles and aromatic rings govern the single photoluminescence (PL) center, which is responsible for high QY in deep red emissive CPDs with narrow FWHM. The CPDs exhibit strong absorption and emission in the deep red light region, low toxicity, and good biocompatibility, making them an efficient probe for both one-photon and two-photon bioimaging. CPDs are rapidly excreted via the kidney system and hepatobiliary system.