Transparent Medium Embedded with CdS Quantum Dots for X‐Ray Imaging.

Scintillators, converting the absorbed high‐energy X‐ray photons into to visible ones, have been used in fields as medical diagnostics, radiation dosimetry, and security inspection. Commercial bulk scintillators generally suffer from time‐consuming production, high‐cost operation, and deteriorated performance especially exposed to humidity. Here, in situ precipitated CdS quantum dots (QDs) within the transparent glass matrix are achieved feasibly. The CdS QDs glass‐ceramic (GC) is explored to be a superior scintillator with an outstanding weather resistance. A profound radioluminescence behavior and long‐term (≈3600 s) stability under X‐ray irradiation of the scintillator with the dose rate of 1 mGyair s−1 are demonstrated. Moreover, the indirect X‐ray imaging of the CdS GC reaches excellent resolution of 10 lp mm−1. Furthermore, the damaged scintillator under a long‐term cumulative dose up to 288 Gyair is recovered via a subsequent thermal treatment. Herein, the explored scintillator of CdS GC executes a promising cost‐effective X‐ray imaging for long‐term operation of the corresponding optoelectronic devices. [ABSTRACT FROM AUTHOR]