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<p>Dynamic fluorescent materials capable of stimulus-responsive emission modulation have emerged as pivotal components in next-generation information security systems. This study presents a novel photoresponsive fluorescent composite system in which spiropyran (SP) was covalently grafted onto naphthalimide-functionalized silica aerogel matrices. These architectures exhibit reversible fluorescence resonance energy transfer between the naphthalimide donors and merocyanine-form of SP acceptors under ultraviolet irradiation, enabling dynamic emission shifting from green (blue) to red. The aggregation-induced emission characteristics of SP were used to engineer a smart material system that can reversibly regulate its distinct red fluorescence by precisely controlling the dispersion of amino groups on naphthalimide-functionalized silica aerogels. This spatial manipulation directly governs the molecular packing state of SP, enabling dynamic fluorescence modulation. A programmable control over the fluorescence chromatic transitions in the composite material was achieved by systematically adjusting the SP grafting densities (1%, 2%, and 3% w/w). A unique mode of dynamic information encryption technology was developed by utilizing dynamic fluorescence variations. These materials can substantially enhance information encryption levels due to their precisely adjustable fluorescence properties in response to external stimuli over time. This makes the encryption process even more unpredictable and complex, thereby exponentially increasing the difficulty for unauthorized parties to replicate or decode the encrypted information.</p>

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Dynamic fluorescence materials based on naphthalimide functionalized silica aerogels covalently grafted with spiropyran: applications in advanced information encryption

  • 期刊论文

  • 发表日期：

    2025年5月13日

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  • Conghao Wu,
  • Wei Wu,
  • Haitao Cai,
  • Menghan Mei,
  • Yangyang Gao,
  • Youhao Wei,
  • Yuanyuan Zi,
  • Jingzhi Wang,
  • Yuhui Yang

摘要

Dynamic fluorescent materials capable of stimulus-responsive emission modulation have emerged as pivotal components in next-generation information security systems. This study presents a novel photoresponsive fluorescent composite system in which spiropyran (SP) was covalently grafted onto naphthalimide-functionalized silica aerogel matrices. These architectures exhibit reversible fluorescence resonance energy transfer between the naphthalimide donors and merocyanine-form of SP acceptors under ultraviolet irradiation, enabling dynamic emission shifting from green (blue) to red. The aggregation-induced emission characteristics of SP were used to engineer a smart material system that can reversibly regulate its distinct red fluorescence by precisely controlling the dispersion of amino groups on naphthalimide-functionalized silica aerogels. This spatial manipulation directly governs the molecular packing state of SP, enabling dynamic fluorescence modulation. A programmable control over the fluorescence chromatic transitions in the composite material was achieved by systematically adjusting the SP grafting densities (1%, 2%, and 3% w/w). A unique mode of dynamic information encryption technology was developed by utilizing dynamic fluorescence variations. These materials can substantially enhance information encryption levels due to their precisely adjustable fluorescence properties in response to external stimuli over time. This makes the encryption process even more unpredictable and complex, thereby exponentially increasing the difficulty for unauthorized parties to replicate or decode the encrypted information.