Carbon dots-engineered gold nanoclusters in silica enabled aqueous phase fluorescence-phosphorescence dual-emission towards advanced luminescent anti-counterfeiting  

作　　者：Xiaojian Yan Lin Wang Wencheng Zhong Ximeng Wang Wenxing Gao Li Shang 

机构地区：[1]State Key Laboratory of Solidification Processing,School of Materials Science and Engineering,Northwestern Polytechnical University,Xi'an 710072,China [2]Shenzhen Research Institute of Northwestern Polytechnical University,Shenzhen 518057,China

出　　处：《Nano Research》2025年第2期858-868,共11页纳米研究(英文版)

基　　金：This work is supported by the National Natural Science Foundation of China(No.22274131);the Shenzhen Science and Technology Program(No.JCYJ20220530161800001);the Innovation Foundation for Doctor Dissertation of Northwestern Polytechnical University(No.CX2024054).

摘　　要：Development of new anti-counterfeiting technology with dynamic optical signals has drawn great attention,but the use of multiple external stimulus or long-time light irradiation inevitably increases the operation complexity and limits the practical application.In this work,we report the design of new fluorescence-phosphorescence dual-emission materials based on carbon dots(CDs)-engineered gold nanoclusters(AuNCs)in silica for advanced luminescent anti-counterfeiting.In particular,co-encapsulation of phosphorescent CDs and fluorescent AuNCs by rigid silica matrix enables the construction of a dual-emission system(AuNCs/CDs@SiO_(2))in aqueous phase.The AuNCs/CDs@SiO_(2) composite displayed significant fluorescence color change based on inner filter effect,as confirmed by in-depth spectral and photophysical characterization.Highly reversible and dynamic color switching between magenta fluorescence and green phosphorescence was easily achieved by simply switching on/off the ultraviolet(UV)irradiation.Potential utility of dual-emitting AuNCs/CDs@SiO_(2) as novel dynamic anti-counterfeiting materials has been successfully demonstrated,including anti-counterfeiting ink,ink-free optical printing film,and information encryption.The present aqueous-phase fluorescence-phosphorescence dual-emission system exhibits two types of anti-counterfeiting mode without introducing external stimulus,increasing the difficulty of imitation and duplication.This work provides a straightforward and generable strategy to design advanced optical anti-counterfeiting materials by combining phosphorescent materials with other fluorophores via reasonable engineering strategy.

关 键 词：gold nanoclusters carbon dots FLUORESCENCE PHOSPHORESCENCE ANTI-COUNTERFEITING 

分 类 号：O64[理学—物理化学]