Liang Ping, Zheng Yihao, Zhang Xingcai, Wei Haopeng, Xu Xiaokai, Yang Xianfeng, Lin Huihong, Hu Chaofan, Zhang Xuejie, Lei Bingfu, Wong Wai-Yeung, Liu Yingliang, Zhuang Jianle
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, People's Republic of China.
Guangdong Laboratory for Lingnan Modern Agriculture, Guangzhou 510642, People's Republic of China.
Nano Lett. 2022 Jul 13;22(13):5127-5136. doi: 10.1021/acs.nanolett.2c00603. Epub 2022 Jun 14.
Carbon dots (CDs) have aroused widespread interest in the construction of room-temperature phosphorescent (RTP) materials. However, it is a great challenge to obtain simultaneous multicolor long-wavelength RTP emission and excellent stability in CD-based RTP materials. Herein, a novel and universal "CDs-in-YOHF" strategy is proposed to generate multicolor and long-wavelength RTP by confining various CDs in the Y(OH)F (YOHF) matrix. The mechanism of the triplet emission of CDs is related to the space confinement, the formation of hydrogen bonds and C-F bonds, and the electron-withdrawing fluorine atoms. Remarkably, the RTP lifetime of orange-emissive CDs-o@YOHF is the longest among the reported single-CD-matrix composites for emission above 570 nm. Furthermore, CDs-o@YOHF exhibited higher RTP performance at long wavelength in comparison to CDs-o@matrix (matrix = PVA, PU, urea, silica). The resulting CDs@YOHF shows excellent photostability, thermostability, chemical stability, and temporal stability, which is rather favorable for information security, especially in a complex environment.
碳点（CDs）在室温磷光（RTP）材料的构建中引起了广泛关注。然而，在基于CD的RTP材料中实现同时多色长波长RTP发射和优异稳定性是一项巨大挑战。在此，提出了一种新颖且通用的“CDs-in-YOHF”策略，通过将各种CDs限制在Y(OH)F（YOHF）基质中来产生多色长波长RTP。CDs的三重态发射机制与空间限制、氢键和C-F键的形成以及吸电子氟原子有关。值得注意的是，橙色发射的CDs-o@YOHF的RTP寿命在报道的发射波长高于570 nm的单CD-基质复合材料中是最长的。此外，与CDs-o@基质（基质 = PVA、PU、尿素、二氧化硅）相比，CDs-o@YOHF在长波长下表现出更高的RTP性能。所得的CDs@YOHF表现出优异的光稳定性、热稳定性、化学稳定性和时间稳定性，这对于信息安全非常有利，尤其是在复杂环境中。
