Dong Juan, Guo Zengsheng, Guo Jin-Shuang, Xue Jingtian, Wang Yilei, Sun Yiqiang, Liu Guang-Ning, Li Cuncheng
School of Chemistry and Chemical Engineering, University of Jinan, Jinan 250022, P. R. China.
Characteristic Laboratory of Forensic Science in Universities of Shandong Province, Shandong University of Political Science and Law, Jinan, Shandong, 250014, P. R. China.
Dalton Trans. 2025 Aug 12;54(32):12210-12216. doi: 10.1039/d5dt01436k.
Room-temperature phosphorescent (RTP) carbon dot (CDs) materials have attracted significant interest due to their excellent biocompatibility, large Stokes shift, and potential for anti-counterfeiting applications. However, the preparation of long-wavelength-emitting phosphorescent materials based on CDs remains a challenge, as most RTP CDs exhibit blue and green emissions. Here, we designed a double confinement strategy to obtain orange-yellow RTP CDs composites (CDs@BO) vis hydrothermal treatment and calcination. After calcination, the phosphorescence emission of the composite material underwent a significant red shift (546 to 582 nm). Simultaneously, under 468 nm excitation, CDs@BO-350 showed both fluorescence emission centred at 521 nm and phosphorescence emission centred at 582 and 627 nm. Structural and chemical characterizations, as well as optical studies, revealed that the CDs@BO composite material features a highly rigid network with electron traps and stable covalent bonds, which generate multiple confinement effects. This material demonstrates great potential for application in the field of multi-level information encryption.
室温磷光（RTP）碳点（CDs）材料因其优异的生物相容性、大斯托克斯位移以及在防伪应用方面的潜力而引起了广泛关注。然而，基于碳点制备长波长发射的磷光材料仍然是一个挑战，因为大多数室温磷光碳点呈现蓝色和绿色发射。在此，我们设计了一种双重限域策略，通过水热处理和煅烧来获得橙黄色室温磷光碳点复合材料（CDs@BO）。煅烧后，复合材料的磷光发射发生了显著的红移（从546纳米至582纳米）。同时，在468纳米激发下，CDs@BO - 350既表现出以521纳米为中心的荧光发射，又表现出以582纳米和627纳米为中心的磷光发射。结构和化学表征以及光学研究表明，CDs@BO复合材料具有高度刚性的网络结构，带有电子陷阱和稳定的共价键，从而产生多重限域效应。这种材料在多级信息加密领域展现出巨大的应用潜力。
