Squaraines (SQs) with tunable emission in the solid state is of great importance for various demands; however a remaining challenge is emission quenching upon aggregation. Herein, a unique SQ, named as CIEE‐SQ, is designed to exhibit strong emission in crystal, undergoing crystallization‐induced reverse from dark ¹(n+σ,π*) to bright ¹(π,π*) excited states. Such an excited state of CIEE‐SQ can be subtly tuned by molecular conformation changes during the unexpected temperature‐triggered single‐crystal to single‐crystal (SCSC) reversible transformation. Furthermore, co‐crystallization between CIEE‐SQ and chloroform largely stabilize the ¹(π,π*) state, enhancing the transition dipole moment and decreasing the reorganization energy to boost the fluorescence, which is promising in data encryption and decryption.

中文翻译：

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结晶诱导的从暗激发态向亮激发态的逆转，用于构建可发射固体的可调谐鱿鱼。

固态发出的可调节鱿鱼（SQs）对于各种需求都非常重要。然而，剩下的挑战是聚集时的发射猝灭。在这里，一个独特的SQ被称为CIEE‐SQ，旨在表现出强烈的晶体发射，经历从暗¹（n +σ，π*）到亮¹（π，π*）激发态的结晶诱导反转。在意外的温度触发单晶到单晶（SCSC）可逆转换过程中，分子构象变化可以巧妙地调节CIEE‐SQ的这种激发态。此外，CIEE‐SQ和氯仿之间的共结晶在很大程度上稳定了¹（π，π*）状态，增强跃迁偶极矩并降低重组能以增强荧光，这在数据加密和解密中很有希望。