X-ray scintillators are core functional components in fields such as medical
diagnosis, industrial inspection, and security screening, where they play an irreplaceable role.
In recent years, metal halide perovskites have drawn extensive attention as X-ray scintillator
materials, attributable to their structural flexibility, high atomic numbers of constituent elements, tunable emission spectra, and high photoluminescence quantum yield. The combination
of rare earth elements with excellent luminescent properties and metal halide perovskites not
only inherits the merits of each material but also enables precise regulation and performance
optimization of the luminescent behavior. This is achieved through the coupling of the unique
energy level structure of rare earth ions and the outstanding semiconductor characteristics of
perovskites. Consequently, rare earth halide perovskites have emerged as a focus of research in
the field of X-ray scintillators in recent years. Based on the remarkable progress achieved by
rare earth halide perovskites in the field of X-ray scintillators in recent years, this paper presents
a systematic review of the physical properties, structures, and scintillation performance of several typical rare earth halide perovskite systems. Additionally, the current research challenges
are summarized, and some improvement suggestions are put forward.
