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<p>Molecular optical switches with sequentially addressable responses offer a rational strategy for designing adaptive optical materials. We present <b>Py-SP</b>, a molecular switch created by covalently tethering a photochromic spiropyran (SP) to a pyrene (Py) fluorophore via a flexible alkyl linker. This design enables stepwise activation of optical responses through mechanical and photonic stimuli. The system exhibits stage-dependent emission and phase transitions: grinding disrupts <b>π-π</b> stacking and activates photochromism, while light induces reversible isomerization and fluorescence resonance energy transfer (FRET) mediated color switching. This allows precise control over monomer-excimer transitions and widely tunable luminescence across the visible spectrum. Leveraging its dynamic and programmable properties, <b>Py-SP</b> is demonstrated in advanced encryption applications such as self-erasing rewritable patterns and time-resolved multilevel security. This work provides a design pathway for intelligent luminescent systems with sequentially addressable functions and supports future anti-counterfeiting and information encryption technologies.</p>

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Sequential activation of dual-mode supramolecular optical switching for dynamic information encryption

  • 期刊论文

  • 发表日期：

    2026年4月3日

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  • Yeye Ai,
  • Qingguo Zeng,
  • Liangquan Zeng,
  • Yuhan Liu,
  • Haojie Mo,
  • Wei Wang,
  • Cong Fan,
  • Kaiyang Zhu,
  • Zhigang Ni,
  • Chuande Wu,
  • Lixin Wu,
  • Yongguang Li

摘要

Molecular optical switches with sequentially addressable responses offer a rational strategy for designing adaptive optical materials. We present Py-SP, a molecular switch created by covalently tethering a photochromic spiropyran (SP) to a pyrene (Py) fluorophore via a flexible alkyl linker. This design enables stepwise activation of optical responses through mechanical and photonic stimuli. The system exhibits stage-dependent emission and phase transitions: grinding disrupts π-π stacking and activates photochromism, while light induces reversible isomerization and fluorescence resonance energy transfer (FRET) mediated color switching. This allows precise control over monomer-excimer transitions and widely tunable luminescence across the visible spectrum. Leveraging its dynamic and programmable properties, Py-SP is demonstrated in advanced encryption applications such as self-erasing rewritable patterns and time-resolved multilevel security. This work provides a design pathway for intelligent luminescent systems with sequentially addressable functions and supports future anti-counterfeiting and information encryption technologies.