Precise Regulation Strategy for Fluorescence Wavelength of Aggregation‐Induced Emission Carbon Dots

• Published in: Advanced science 2024-12, Vol.11 (48), p.e2409345-n/a
• Main Authors: Ding, Liu, Jin, Xilang, Gao, Yuchong, Kang, Shouwang, Bai, Haiyan, Ma, Xuehao, Ai, Taotao, Zhou, Hongwei, Chen, Weixing
• Format: Article
• Language: English
• Subjects: aggregation‐induced emission (AIE); Carbon; Efficiency; Fourier transforms; Graphite; graphite nitrogen doping; Mass spectrometry; multi‐color emission; multi‐information encryption; Nitrogen; Scientific imaging; sp2 domains; Temperature
• ISSN: 2198-3844; 2198-3844
• DOI: 10.1002/advs.202409345

Aggregation‐induced emission (AIE) carbon dot (CDs) in solid state with tunable multicolor emissions have sparked significant interest in multidimensional anti‐counterfeiting. However, the realization of solid‐state fluorescence (SSF) by AIE effect and the regulation of fluorescence wavelength in solid state is a great challenge. In order to solve this dilemma, the AIE method to prepare multi‐color solid‐state CDs with fluorescence wavelengths ranging from bright blue to red emission is employed. Specifically, by using thiosalicylic acid and carbonyl hydrazine as precursors, the fluorescence wavelength can be accurately adjusted by varying the reaction temperature from 150 to 230 °C or changing the molar ratio of the precursors from 1:1 to 1:2. Structural analysis and theoretical calculations consistently indicate that increasing the sp2 domains or doping with graphite nitrogen both cause a redshift in the fluorescence wavelength of CDs in the solid state. Moreover, with the multi‐dimensional and adjustable fluorescence wavelength, the application of AIE CDs in the fields of multi‐anti‐counterfeiting encryption, ink printing, and screen printing is demonstrated. All in all, this work opens up a new way for preparing solid‐state multi‐color CDs using AIE effect, and further proposes an innovative strategy for controlling fluorescence wavelengths. Herein, they proposed an efficient and precise wavelength tuning mechanism for the Aggregation‐induced emission (AIE) carbon dots (CDs). Specifically, by using thiosalicylic acid and carbonyl hydrazine as precursors, they can accurately adjust the fluorescence wavelength by varying the reaction temperature or changing the molar ratio of the precursors. Moreover, the application of AIE CDs in the fields of multi anti‐counterfeiting encryption has been demonstrated.