Liang Ping, Zheng Yihao, Liu Fengru, Shao Huaiyu, Hu Chaofan, Lei Bingfu, Zhang Xuejie, Liu Yingliang, Zhuang Jianle, Zhang Xingcai
Key Laboratory for Biobased Materials and Energy of Ministry of Education/Guangdong Provincial Engineering Technology Research Center for Optical Agriculture, College of Materials and Energy, South China Agricultural University, Guangzhou 510642, China.
Joint Key Laboratory of the Ministry of Education, Institute of Applied Physics and Materials Engineering, University of Macau, Avenida da Universidade, Taipa, Macao SAR 999078, China.
JACS Au. 2023 Aug 11;3(8):2291-2298. doi: 10.1021/jacsau.3c00311. eCollection 2023 Aug 28.
Carbon dot (CD)-based luminescent materials have attracted great attention in optical anti-counterfeiting due to their excellent photophysical properties in response to ultraviolet-to-visible excitation. Hence, there is an urgent need for the general synthesis of CD-based materials with multimode luminescence properties and high stability; however, their synthesis remains a formidable challenge. Herein, CDs were incorporated into a Yb,Tm-doped YF matrix to prepare CDs@YF:Yb,Tm composites. The YF plays a dual role, not only serving as a host for fixing rare earth luminescent centers but also functioning as a rigid matrix to stabilize the triplet state of the CDs. Under the excitation of 365 nm ultraviolet light and 980 nm near-infrared light, CDs@YF:Yb,Tm exhibited blue fluorescence and green room-temperature phosphorescence of CDs and upconversion luminescence of Tm, respectively. Due to the strong protection of the rigid matrix, the stability of CDs@YF:Yb,Tm is greatly improved. This work provides a general synthesis strategy for achieving multimode luminescence and high stability of CD-based luminescent materials and offers opportunities for their applications in advanced anti-counterfeiting and information encryption.
基于碳点（CD）的发光材料因其在紫外到可见光激发下具有优异的光物理性质，在光学防伪领域引起了极大关注。因此，迫切需要通用合成具有多模发光性质和高稳定性的基于CD的材料；然而，它们的合成仍然是一个巨大的挑战。在此，将碳点掺入Yb、Tm掺杂的YF基质中，制备了CDs@YF:Yb,Tm复合材料。YF起到双重作用，不仅作为固定稀土发光中心的主体，还作为刚性基质来稳定碳点的三重态。在365nm紫外光和980nm近红外光激发下，CDs@YF:Yb,Tm分别表现出碳点的蓝色荧光和绿色室温磷光以及Tm的上转换发光。由于刚性基质的强保护作用，CDs@YF:Yb,Tm的稳定性大大提高。这项工作为实现基于CD的发光材料的多模发光和高稳定性提供了一种通用合成策略，并为其在先进防伪和信息加密中的应用提供了机会。
