材料科学
量子产额
聚合物
光致发光
荧光
光化学
纳米技术
发光
半最大全宽
吸收(声学)
光电子学
复合材料
光学
化学
物理
作者
Junjun Liu,Yijia Geng,Daowei Li,Yuexuan Hua,Zepeng Huo,Yunfeng Li,Kai Zhang,Shoujun Zhu,Haotong Wei,Weiqing Xu,Jinlan Jiang,Bai Yang
标识
DOI:10.1002/adma.201906641
摘要
Abstract Development of high‐performance carbon dots (CDs) with emission wavelength longer than 660 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 π conjugated system formed with N heterocycles and aromatic rings governs 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.
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