Structural interconversion of tin hybrids: solvent-driven fluorescence modulation for logic gate and anticounterfeiting applications

초록

Solvent-dependent luminescence modulation in lead-free, environmentally friendly organic-inorganic hybrid materials offers a new route for dynamic optical encoding and logic operations. This study presents solventdriven structural interconversion between zero-dimensional (0D) and two-dimensional (2D) tin-based hybrids, where the 0D form exhibits bright yellow fluorescence with a photoluminescence peak at 564 nm and the 2D structure is non-fluorescent. Interestingly, the non-luminescent 2D phase turns emissive in dichloromethane but loses fluorescence upon heating to 60 degrees C, attributed to a reversible structural transition between 0D and 2D forms. Hirshfeld surface analysis reveals that dichloromethane plays a key role in stabilizing the 0D structure through specific intermolecular interactions, thereby enabling reversible photoluminescence (PL) switching. This reversible on/off PL behavior is exploited to construct optical logic gates and Morse code-based anticounterfeiting systems. This kind of solvent-dependent reversible PL switching phenomenon will pave the way for designing advanced luminescent materials for dynamic and secure photonic applications.

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