Molecularly Engineered Spherical Hybrid Glass Scintillator Enables Portable Omnidirectional X‐Ray Detection With High Sensitivity

ABSTRACT Omnidirectional X‐ray detection is important for applications such as high‐energy astrophysics and environmental safety monitoring. However, conventional approaches to omnidirectional X‐ray detection, based on solid‐state flat‐panel detectors or gas/liquid‐state spherical detectors, are often hindered by fabrication complexity, insufficient omnidirectional response, or limited portability. Herein, we present a portable solid‐state omnidirectional X‐ray detector (ODXD) based on a spherical glass scintillator composed of (CPTP) 2 MnBr 4 (CPTP = cyclopropyltriphenylphosphine). From a crystallographic perspective, the cyclopropyl group in triphenylphosphine cation plays a critical role in modulating the phase transition of (CPTP) 2 MnBr 4 . This molecular design not only lowers melting temperature (170°C), enabling device fabrication via a low‐temperature melt‐quenching process, but also provides a sufficiently high glass transition temperature (61°C) to ensure operational stability. From a device perspective, the ODXD based on spherical (CPTP) 2 MnBr 4 glass offers excellent omnidirectionality and registers an X‐ray response limit of 0.49 µGy air s −1 , which is 11‐fold lower than the regular medical diagnostic dose rate (5.5 µGy air s −1 ), demonstrating exceptional capabilities for monitoring omnidirectional X‐ray sources with high sensitivity. Given the high processability of organic‐inorganic glasses and the simplicity of their fabrication, our findings provide a viable solution for constructing portable omnidirectional optical detectors toward advanced sensing and photonic applications.