A new type of polymer carbon dots with high quantum yield: From synthesis to investigation on fluorescence mechanism
A new type of polymer carbon dots with high quantum yield: From synthesis to investigation on fluorescence mechanism
复制标题
新型高量子产率聚合物碳点：从合成到荧光机理研究
DOI：
10.1016/j.polymer.2017.02.039
复制
发表时间：
2017
期刊：
影响因子：
4.6
通讯作者：
Yang Bai
中科院分区：
文献类型：
--
作者：
Tao Songyuan;Song Yubin;Zhu Shoujun;Shao Jieren;Yang Bai
碳点(Cd)是一个备受关注的领域，目前仅限于不清楚的光致发光(PL)机制。已经做了很多努力来澄清某些PL中心，但仍然是徒劳的。本文以聚丙烯酸和乙二胺为原料，采用水热法合成了绝对量子产率高达44.18%的新型聚合物碳点。通过仔细的比较和分析，认为荧光中心应该是-N双键和-C双键(主要是酰胺和/或其衍生结构)，而不是大规模的共轭结构，这与以前报道的亚荧光团相似。此外，还考虑了高分子链的作用，通过交联和包裹荧光中心，降低了分子的运动自由度，提供了溶剂化效应，从而提高了量子产率和红移发射。对荧光机理的研究有助于对非共轭荧光体系中的交联增强发射(CEE)效应有一个新的认识。
Carbon dots (CDs) is an area of intense focus, currently limited to unclear photoluminescence (PL) mechanism. Much effort has been made to clarify the certain PL centers but is still fruitless. Herein, a new type of polymer carbon dots (PCDs) with absolute quantum yield as high as 44.18% was synthesized by hydrothermally crosslinking polyacrylic acid and ethylenediamine. Through carefully comparing and analysing, the PL centers were supposed to be -Ndouble bondO and -Cdouble bondO (mainly amide and/or its derived structures) rather than large-scale conjugated structure, which was similar to the previously reported sub-fluorophores. Besides, the function of polymer chains was considered to decrease the motion freedoms and provide a solvation effect by crosslinking and wrapping the fluorescence centers, which led to the improved quantum yield and red-shifted emission. The investigation on fluorescence mechanism can provide with a new understanding on crosslink enhanced emission (CEE) effect in non-conjugated fluorescence systems.