Colorless and highly toxic phosgene has long been considered to be a great menace to human health and national security. Excellent AIE + TICT characteristic ratiometric and colorimetric fluorescent sensor TPE-CI was constructed with the combination of the TICT based 3-benzo[d]imidazole-chromen-2-imine unit and AIE based tetraphenylethene (TPE) unit. TPE-CI can detect phosgene not only in organic solvent through a change from the TICT process to the AIE process, but also in solid-state through a new change from the AIE + TICT process to the AIE process. TPE-CI exhibited convenient to use as a test strip, rapid response (less than 6 s in solvent and 2 min in air atmosphere), excellent selectivity and fair sensitivity for visual inspection of trace phosgene in the organic solvent and in the gas phase. The limit of detection (LOD) was calculated and derived as 0.36 μM in solvent and 0.27 ppm in the air atmosphere, which was far below the acute phosgene exposure level of human response. The satisfactory results indicate that this AIE + TICT strategy may offer valuable thinking to develop convenient solid-state optical sensors with dual ratiometric and colorimetric fluorescence response for gaseous phosgene identification.

长期以来，无色和剧毒的光气一直被认为是对人类健康和国家安全的巨大威胁。结合了基于TICT的3-苯并[d]咪唑-铬-2-亚胺单元和基于AIE的四苯基乙烯（TPE）单元，构建了出色的AIE + TICT特性比率和比色荧光传感器TPE-CI。TPE-CI不仅可以通过从TICT流程转换为AIE流程来检测有机溶剂中的光气，还可以通过从AIE + TICT流程向AIE流程进行新的更改来检测固态中的光气。热塑性弹性体表现出用作试纸的便利性，响应速度快（在溶剂中少于6 s，在空气中少于2分钟），具有出色的选择性和公平的灵敏度，可用于目测有机溶剂和气相中的痕量光气。计算得出的检出限（LOD）为溶剂中0.36μM，空气中0.27 ppm，远低于人类响应的急性光气暴露水平。令人满意的结果表明，这种AIE + TICT策略可能为开发方便的固态光学传感器提供有价值的思路，该固态光学传感器具有用于气态光气鉴定的双比例和比色荧光响应。