High‐Entropy Glass Scintillators With Anti‐Crystallization Stability for High‐Resolution X‐Ray Imaging

ABSTRACT Glass scintillators have become promising for high‐resolution x‐ray imaging owing to the low‐scattering light output, but the inherent tendency toward crystallization remains a critical challenge to maintain long‐term stability. To fundamentally tackle glass metastability, a high‐entropy design is utilized to disrupt the energetic preference for crystallization. A series of Mn‐based organic–inorganic hybrid metal halides (ATPP n ) 2 MnBr 4 (ATPP n = alkyltriphenylphosphonium, n = 2–6) are prepared to leverage configurational entropy for the construction of five‐component high‐entropy glass (HEG). The elevated entropy in HEG establishes a formidable kinetic barrier against crystallization, thereby overcoming rapid degradation to ensure exceptional stability for over 150 days. The current Mn‐based HEG scintillator exhibits bright luminescence and outstanding scintillation properties, including a low detection limit of 16.5 nGy s −1 and a spatial resolution of 28.3 lp mm −1 . This superior performance further allows for high‐resolution and dynamic x‐ray imaging to visualize real‐time detection of rotating targets. This work not only demonstrates a stable, high‐performance glass scintillator but also validates a general high‐entropy strategy to overcome the metastability of functional glasses.