The development of advanced anti-counterfeiting technology using photochromic inorganic materials with dynamic optical signals has garnered significant interest,but the limited color response and uncontrolled photochr...The development of advanced anti-counterfeiting technology using photochromic inorganic materials with dynamic optical signals has garnered significant interest,but the limited color response and uncontrolled photochromic kinetics largely restrict their practical application.In this work,we report the design of photochromic supramolecular assembly based on host-vip chemistry,enabling kineticstunable time-encoded anti-counterfeiting.By co-assembling of photochromic tungsten oxide quantum dots(WO_(3) QDs) with cucurbit[7]uril(CB[7]),we developed a kinetics-tunable photochromic supramolecular assembly(WO_(3)-CB[7]).The WO_(3)-CB[7] assembly exhibits distinct photochromic kinetics compared to free WO_(3) QDs due to efficient suppression of photogenerated decomposition of water adsorbed on WO_(3)QDs,as verified by spectral and photophysical analysis.The photochromic kinetics can be readily modulated by adjusting the WO_(3) QDs to CB[7] ratio.The kinetics-tunable photochromic WO_(3)-CB[7] assembly has been successfully applied as innovative anti-counterfeiting materials for fabricating time-encoded anti-counterfeiting arrays and information encryption system.The irradiation time serves as a key parameter for decrypting the final information,thereby enhancing the complexity of replication and counterfeiting.This approach offers a simple,scalable and generalizable strategy for designing advanced optical anti-counterfeiting materials by integrating inorganic photochromic materials with the supramolecular strategy.展开更多
基金supported by the National Natural Science Foundation of China (No.22274131)Shenzhen Science and Technology Program (Nos.JCYJ20220530161800001,JCYJ20240813150813018)+1 种基金the Innovation Foundation for Doctor Dissertation of Northwestern Polytechnical University (No.#CX2024054)the Analytical&Testing Center of Northwestern Polytechnical University for the testing and funding (No.2024T017)support。
文摘The development of advanced anti-counterfeiting technology using photochromic inorganic materials with dynamic optical signals has garnered significant interest,but the limited color response and uncontrolled photochromic kinetics largely restrict their practical application.In this work,we report the design of photochromic supramolecular assembly based on host-vip chemistry,enabling kineticstunable time-encoded anti-counterfeiting.By co-assembling of photochromic tungsten oxide quantum dots(WO_(3) QDs) with cucurbit[7]uril(CB[7]),we developed a kinetics-tunable photochromic supramolecular assembly(WO_(3)-CB[7]).The WO_(3)-CB[7] assembly exhibits distinct photochromic kinetics compared to free WO_(3) QDs due to efficient suppression of photogenerated decomposition of water adsorbed on WO_(3)QDs,as verified by spectral and photophysical analysis.The photochromic kinetics can be readily modulated by adjusting the WO_(3) QDs to CB[7] ratio.The kinetics-tunable photochromic WO_(3)-CB[7] assembly has been successfully applied as innovative anti-counterfeiting materials for fabricating time-encoded anti-counterfeiting arrays and information encryption system.The irradiation time serves as a key parameter for decrypting the final information,thereby enhancing the complexity of replication and counterfeiting.This approach offers a simple,scalable and generalizable strategy for designing advanced optical anti-counterfeiting materials by integrating inorganic photochromic materials with the supramolecular strategy.
