By tactfully structuring a luminescent molecule as an accurate pH probe with aggregation-induced emission (AIE) feature, it is significant to overcome aggregation-caused quenching of emitted light in practice. Herein, we present a simple AIE-active fluorescence probe for pH detection on the basis of intramolecular charge transfer (ICT) with wide response range and high sensitivity reaction. The donor-acceptor-donor (D-A-D) style probe utilized a conjugated structural hybrid of the electron-withdrawing nitrile group and electron-donating hydroxyl as well as dimethylamino groups for fluorescent platform. The AIE-active probe possesses good fluorescence under water fraction up to 90% in mixed MeOH/water system. Furthermore, it can be used in profiling and visualization of pH detection in MeOH/water system at f_w = 90% under UV 365 nm lamp. What’s more, the probe can be employed to be a broad range test paper of pH detection, paving the way for low-cost practical applications.

通过将发光分子巧妙地构建为具有聚集诱导发射（AIE）功能的精确pH探针，在实践中克服聚集引起的发射光猝灭具有重要意义。在本文中，我们提出了一种基于分子内电荷转移（ICT）且具有宽响应范围和高灵敏度反应的，用于pH检测的简单AIE活性荧光探针。供体-受体-供体（DAD）式探针利用吸电子腈基与给电子羟基以及二甲基氨基的共轭结构杂化体作为荧光平台。在混合MeOH /水系统中，水组分高达90％时，AIE活性探针具有良好的荧光。此外，它还可以用于MeOH /水系统中f _w的pH检测的分析和可视化=在365 nm紫外线灯下为90％。而且，该探针可以用作广泛的pH检测试纸，为低成本的实际应用铺平了道路。