3D‐Printed Optical Volatile Organic Compound Sensors Based on Donor‐Substituted Coumarin Thermally Activated Delayed Fluorescence Emitters

Volatile organic compounds (VOCs) pose a major environmental and health concern, motivating the development of solid‐state optical sensing materials that are both responsive and easily manufacturable. Here we introduce a new family of donor‐substituted coumarin thermally activated delayed fluorescent emitters and embed them within photocurable acrylate resins. These materials retain strong solid‐state photoluminescence and can be 3D‐printed into functional sensing architectures that exhibit reproducible and analyte‐dependent, intensity‐based optical responses to chemically diverse VOC vapors. This work demonstrates how tailored emitter design and 3D printing can be combined to realize versatile VOC‐responsive optical materials.