He Jiangling, He Youling, Chen Yonghao, Lei Bingfu, Zhuang Jianle, Xiao Yong, Liang Yeru, Zheng Mingtao, Zhang Haoran, Liu Yingliang
Guangdong Provincial Engineering Technology Research Center for Optical Agriculture, College of Materials and Energy, South China Agricultural University, Guangzhou, 510642, China.
Small. 2017 Jul;13(26). doi: 10.1002/smll.201700075. Epub 2017 May 17.
Stable solid-state red fluorescence from organosilane-functionalized carbon dots (CDs) with sizes around 3 nm is reported for the first time. Meanwhile, a novel method is also first reported for the efficient construction of dual-fluorescence morphologies. The quantum yield of these solid-state CDs and their aqueous solution is 9.60 and 50.7%, respectively. The fluorescence lifetime is 4.82 ns for solid-state CDs, and 15.57 ns for their aqueous solution. These CDs are detailedly studied how they can exhibit obvious photoluminescence overcoming the self-quenching in solid state. Luminescent materials are constructed with dual fluorescence based on as-prepared single emissive CDs (red emission) and nonfluorescence media (starch, Al O , and RnOCH COONa), with the characteristic peaks located at nearly 440 and 600 nm. Tunable photoluminescence can be successfully achieved by tuning the mass ratio of CDs to solid matrix (such as starch). These constructed dual-fluorescence CDs/starch composites can also be applied in white light-emitting diodes with UV chips (395 nm), and oxygen sensing.
首次报道了尺寸约为3nm的有机硅烷功能化碳点（CDs）的稳定固态红色荧光。同时，还首次报道了一种高效构建双荧光形态的新方法。这些固态CDs及其水溶液的量子产率分别为9.60%和50.7%。固态CDs的荧光寿命为4.82ns，其水溶液的荧光寿命为15.57ns。详细研究了这些CDs如何能够克服固态中的自猝灭而表现出明显的光致发光。基于所制备的单发射CDs（红色发射）和非荧光介质（淀粉、Al₂O₃和RnOCH₂COONa）构建了具有双荧光的发光材料，其特征峰位于近440和600nm处。通过调节CDs与固体基质（如淀粉）的质量比，可以成功实现可调光致发光。这些构建的双荧光CDs/淀粉复合材料还可应用于具有紫外芯片（395nm）的白光发光二极管以及氧传感。
