F, N co-doped carbon nanomaterials for multi-level information encryption: Room-temperature phosphorescence and solid-state fluorescence

磷光 荧光 发光 光化学 材料科学 兴奋剂 碳纤维 纳米材料 化学 纳米技术 光电子学 复合数 光学 物理 复合材料
作者
Hongmei Zhang,Xiangjun Guo,Jiyao Xu,Yuman Zhang,Yujia Deng,Xihui Zhao
出处
期刊:Journal of Alloys and Compounds [Elsevier BV]
卷期号:942: 168910-168910 被引量:4
标识
DOI:10.1016/j.jallcom.2023.168910
摘要

The non-radiative transition of triplet excitons limits the emission of room-temperature phosphorescence (RTP). In this paper, F, N co-doped carbon nanomaterials including carbon dot solutions (L-CDs) with cyan fluorescence and solid-state carbon nanowires (S-CNWs) with yellow fluorescence were successfully prepared by the one-pot hydrothermal method. Interestingly, L[email protected] composites with green RTP were obtained by mixing L-CDs with PVA. The RTP production was attributed to F, N related heteroatomic functional groups on the surface of L-CDs. The C-N, CN bonds form lone electron pairs, which promote the electron transition from n→π∗. The F doping reduces the energy gap from the single to the triplet state, which facilitates the inter-system crossing (ISC) process and increases the radiative transition of the triplet exciton to produce RTP. In addition, PVA forms abundant hydrogen bonds with L-CDs to effectively immobilize the luminescence center and isolate atmospheric oxygen, so that L[email protected] has stable phosphorescence emission at room temperature and this phosphorescence is reversible in dry and wet states. In contrast, S-CNWs displayed solid-state yellow fluorescence, but no phosphorescence even though doped into the PVA matrix ([email protected]). Therefore, based on the different characteristics of fluorescence and phosphorescence of L-CDs and S-CNWs, a complex, multi-level information encryption method is proposed and the potential applications of S-CNWs powder for fingerprint recording are explored.
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