Strategy for Activating Room-Temperature Phosphorescence of Carbon Dots in Aqueous Environments
Strategy for Activating Room-Temperature Phosphorescence of Carbon Dots in Aqueous Environments
复制标题
水环境中碳点室温磷光激活策略
DOI：
10.1021/acs.chemmater.9b02176
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发表时间：
2019-10-08
影响因子：
8.6
通讯作者：
Dong, Chuan
中科院分区：
文献类型：
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作者：
Gao, Yifang;Zhang, Huilin;Dong, Chuan
由于非辐射衰变途径的释放，在水环境中激活室温磷光（RTP）发射是一项具有挑战性的壮举。在这里，提出了一种设计策略，有效地促进存在的RTP的碳量子点（CD）在水溶液中，通过利用CD和三聚氰胺构建氢键网络，形成一个聚合物（M-CD）。所得的M-CD不仅具有664 ms的超长磷光寿命，而且在468 nm激发下在水环境中具有25%的相对高的量子产率。这也是在水性环境中实现固态CD的RTP的罕见示例。进一步的研究表明，氢键网络是在水环境中实施RTP的关键。CD和三聚氰胺中共价键的存在进一步稳定了氢键骨架和三重态。此外，在M-CD内部形成的结合水在水溶液中稳定RTP中也起着不可或缺的作用。利用M-CD的特点，有效地实现了数据的双重加密和解密。此外，这种策略对于大多数磷光材料是通用的。这一结果将为扩大RTP材料及其在水环境中的应用铺平道路。
Activating room-temperature phosphorescence (RTP) emission in aqueous environments is a challenging feat because of the releasing of nonradiative decay pathways. Here, a design strategy was presented that effectively promotes the presence of RTP of carbon dots (CDs) in aqueous solutions by utilizing CDs and melamine to construct hydrogen-bonded networks to form a polymer (M-CDs). The obtained M-CDs not only enjoy an ultralong phosphorescence lifetime of 664 ms, but also relatively high quantum yield of 25% in an aqueous environment at 468 nm excitation. This is also a rare example of achieving RTP of CDs with a solid state in an aqueous environment. Further investigations reveal that the hydrogen-bonded networks are critical to the implementation of RTP in an aqueous environment. The existence of covalent bonds in CDs and melamine further stabilizes the hydrogen-bond skeleton and triplet state. Furthermore, the bound water formed inside the M-CDs also plays an indispensable role in stabilizing the RTP in the aqueous solution. Given the feature, the M-CDs are used to effectively implement double data encryption and decryption. In addition, this strategy is universal for most phosphorescence materials. This result will pave the way toward expanding RTP materials and their applications in aqueous environments.