State Key Laboratory of Supramolecular Structure, and Materials, College of Chemistry, Jilin University, Changchun, 130012, P. R. China.
College of Chemistry and Molecular Engineering, Zhengzhou University, 100 Kexue Road, Zhengzhou, 450001, China.
Angew Chem Int Ed Engl. 2018 Feb 23;57(9):2393-2398. doi: 10.1002/anie.201712662. Epub 2018 Feb 6.
Polymer carbon dots (PCDs) are proposed as a new class of room-temperature phosphorescence (RTP) materials. The abundant energy levels in PCDs increase the probability of intersystem crossing (ISC) and their covalently crosslinked framework structures greatly suppress the nonradiative transitions. The efficient methods allow the manufacture of PCDs with unique RTP properties in air without additional metal complexation or complicated matrix composition. They thus provide a route towards the rational design of metal-free RTP materials that may be synthesized easily. Furthermore, we find that RTP is associated with a crosslink-enhanced emission (CEE) effect, which provides further routes to design improved PCDs with diverse RTP performance. Our results show the potential of PCDs as a universal route to achieve effective metal-free RTP.
聚合物碳点（PCD）被提议作为一类新的室温磷光（RTP）材料。PCD 中的丰富能级增加了系间窜越（ISC）的概率，并且它们的共价交联框架结构极大地抑制了非辐射跃迁。这些有效的方法允许在空气中制造具有独特 RTP 性质的 PCD，而无需额外的金属络合或复杂的基质组成。它们为合理设计可能易于合成的无金属 RTP 材料提供了一条途径。此外，我们发现 RTP 与交联增强发射（CEE）效应有关，这为设计具有不同 RTP 性能的改进 PCD 提供了进一步的途径。我们的结果表明 PCD 具有作为实现有效无金属 RTP 的通用途径的潜力。
