期刊
CARBON
卷 152, 期 -, 页码 609-615出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.carbon.2019.06.061
关键词
Room temperature phosphorescence carbon dots; Information encryption; pH sensing; Mechanism of pH-responsible
资金
- Fundamental Research Funds for the Central Universities [XDJK2018AC004]
- Natural Science Foundation of Chongqing [cstc2018jcyjAX0197]
Chemical doping with nitrogen, phosphorus or halogens can effectively favor the room temperature phosphorescence (RTP) appearing of carbon dots (CDs) through facilitating their intersystem crossing (ISC) process. Here we raised a facile microwave strategy to synthesize nitrogen and phosphorus co-doped carbon dots (P-CDs), while triethanolamine served as the carbon source with phosphoric acid being the dopant. Meanwhile, the P-CDs showed both the bright-blue fluorescent emission and the green-RTP emission. Additionally, the filter paper functioned as the matrix to stabilize the triplet excitons of P-CDs, thus achieving their RTP emission by suppressing the non-radiative transitions. Significantly, an innovative painting technology of employing P-CDs as RTP-ink has been developed toward the confidential information encryption. Moreover, we applied the proposed P-CDs to respectively assay pH ranging from 9.15 to 13.55 and 2.29 to 13.55 by virtue of their pH-responsible fluorescence and RTP. Again, we further explored the fluorescent and phosphorescent sensing mechanism of P-CDs by the deprotonation of P-O bonds and the precipitation of P-CDs. (C) 2019 Elsevier Ltd. All rights reserved.
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