Solvent-Controlled Synthesis of Highly Luminescent Carbon Dots with a Wide Color Gamut and Narrowed Emission Peak Widths
Solvent-Controlled Synthesis of Highly Luminescent Carbon Dots with a Wide Color Gamut and Narrowed Emission Peak Widths
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溶剂控制合成具有宽色域和窄发射峰宽的高发光碳点
DOI：
10.1002/smll.201800612
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发表时间：
2018-05-29
期刊：
影响因子：
13.3
通讯作者：
Xiong, Huan-Ming
中科院分区：
文献类型：
--
作者：
Ding, Hui;Wei, Ji-Shi;Xiong, Huan-Ming
碳量子点在生物成像、生物医学和光电子学等领域有着巨大的应用潜力。到目前为止，仍然难以产生在整个可见光谱上具有高量子产率（QY）的光致发光（PL）可调谐CD，并且使CD的发射峰宽度变窄接近典型量子点的发射峰宽度。在本工作中，通过溶剂热一锅法，仅调节反应溶剂，获得了一系列发射波长在443 ~ 745 nm之间可调谐、量子产率在13- 54%之间、半高宽在108 ~ 55 nm之间变窄的CD。这些CD的独特光学特征是基于它们的粒度差异以及石墨含氮和含氧官能团的含量，这可以通过控制溶剂热反应期间的脱水和碳化过程来调节。通过将一种或三种CD以适当的比例分散到聚乙烯醇中，制备了蓝色、绿色、黄色、红色和甚至纯白色发光膜（国际照明委员会（CIE）= 0.33、0.33，QY = 39%）。近红外发射CD是用于体外和体内生物成像的优良荧光探针，因为它们在水中的高QY、长期稳定性和低细胞毒性。
Carbon dots (CDs) have tremendous potential applications in bioimaging, biomedicine, and optoelectronics. By far, it is still difficult to produce photoluminescence (PL) tunable CDs with high quantum yield (QY) across the entire visible spectrum and narrow the emission peak widths of CDs close to those of typical quantum dots. In this work, a series of CDs with tunable emission from 443 to 745 nm, quantum yield within 13-54%, and narrowed full width at half maximum (FWHM) from 108 to 55 nm, are obtained by only adjusting the reaction solvents in a one-pot solvothermal route. The distinct optical features of these CDs are based on their differences in the particle size, and the content of graphitic nitrogen and oxygen-containing functional groups, which can be modulated by controlling the dehydration and carbonization processes during solvothermal reactions. Blue, green, yellow, red, and even pure white light emitting films (Commission Internationale de L'Eclairage (CIE)= 0.33, 0.33, QY = 39%) are prepared by dispersing one or three kinds of CDs into polyvinyl alcohol with appropriate ratios. The near-infrared emissive CDs are excellent fluorescent probes for both in vitro and in vivo bioimaging because of their high QY in water, long-term stability, and low cytotoxicity.