作者：Xintong Wu, Yingbo Chen*, Shuang Fu, Linzhe Xu, Liu Ye
关键字：Carbon dots; Room temperature phosphorescence; Anticounterfeiting
论文来源：期刊
具体来源：ACS Applied Nano Materials 7 (2024) 28348-28357
发表时间：2024年

ACS Applied Nano Materials 7 (2024) 28348-28357

DOI: 10.1021/acsanm.4c05457

Carbon dots (CDs) with room temperature phosphorescence (RTP) have emerged as popular luminescent materials in recent years. RTP CDs have a wide range of applications in several fields, such as anticounterfeiting, information encryption, sensors, and optoelectronics, due to their excellent optical properties, simple preparation process, etc. Therefore, it is significant to develop RTP CDs with a long lifetime and outstanding optical intensity. In the present work, N, P, and B atoms codoped into CDs (N, P, and B-CDs) were synthesized by a simple and green one-step hydrothermal method using arginine, phosphoric acid, and boric acid as precursors. The dense cross-linked network generated by hydrothermal carbonization and the effect of codoping of multiple atoms endowed N, P, and B-CDs with excellent phosphorescence properties. Under UV light, the N, P, and B-CDs showed blue fluorescence, and after the removal of the UV light, the afterglow of the RTP CDs visible to the naked eye was green and still persisted for about 12 s. The absolute photoluminescence quantum yield (QY) and phosphorescence lifetime of N, P, and B-CDs were 15.89% and 902 ms, respectively, indicating long-lifetime RTP CDs. Finally, this work exemplified the remarkable effectiveness of N, P, and B-CDs in anticounterfeiting and information encryption. This work provides an idea for the preparation of simple and efficient RTP CDs and a strategy for the field of anticounterfeiting.