Excitation-dependent carbon dots powders based on dehydration condensation by microwave–hydrothermal method
- 1.1k Downloads
A green and economical microwave–hydrothermal method is employed to prepare carbon dots (CDs) that low-cost dl-malic acid serves as the carbon source and the formamide serves simultaneously as the pyrolysis solvent and carbon source. In the reaction process, neither assistant catalytic treatment nor further surface modification is necessary. We obtain better disperse CDs powders whose quantum yield reaches 25% as well as explain the dehydration condensation reaction mechanism based on the analysis by XPS and FTIR data. The luminescent properties are investigated in detail, and the results reveal that the excitation-dependent feature of as-prepared CDs has the potential for anti-counterfeiting mark and luminescence picture field.
This work was supported by the National Science Foundation of China (No. 61205180), the Young Top-notch Talent Support Program of Hebei Province and the Distinguished Young Scholars of Hebei University (2012JQ01). We also appreciate the National Science Foundation of Hebei University (Nos. 799207217040, 799207217035, 799207217027).
- 3.Yuan FL, Yuan T, Sui LZ, Wang ZB, Xi ZF, Li YC, Li XH, Fan LZ, Tan Z, Chen AM, Jin MX, Yang SH (2018) Engineering triangular carbon quantum dots with unprecedented narrow bandwidth emission for multicolored LEDs. Nat Commun 9:2249-1–2249-11Google Scholar
- 8.Wang ZF, Yuan FL, Li XH, Li YC, Zhong HZ, Fan LZ, Yang SH (2017) 53% Efficient red emissive carbon quantum dots for high color rendering and stable warm white-light-emitting diodes. Adv Mater 29(37):1702910-1–1702910-7Google Scholar
- 27.Qu D, Zheng M, Zhang LG, Zhao HF, Xie ZG, Jing XB, Haddad RE, Fan HY, Sun ZC (2014) Formation mechanism and optimization of highly luminescent N-doped graphene quantum dots. Sci Rep 4:1–9Google Scholar