Publication date: 17th July 2025
Luminescent metal halides are attracting growing attention as scintillators for X-ray imaging in scientific research, safety inspection, medical diagnosis, etc.; however, their decay time is too long due to B-site cations confining to ns2, d5, and d10 metals. Here we design a family of lead-free Eu(II)-based hybrid perovskitoids with spin-allowed 5d-4f bandgap transition emission toward simplified carrier transport during scintillation process. The experimental and theoretical analyses verify that the electron-phonon coupling therein is suppressed via symmetrical structural parameters as confirmed by the low Huang–Rhys factor, and thus diminishes the homogeneous broadening of the emission bandwidths. Moreover, the 1D/0D structures with edge/face-sharing [EuBr6]4- octahedra further contribute to lowing bandgaps and enhancing quantum confinement effect, enabling efficient scintillation performance. We demonstrate the X-ray imaging applications potentially in medical diagnosis, industrial inspection, and security. Our results pave the way for developing low-dimensional rare-earth-based halides for optoelectronic applications.
This research was supported by National Natural Science Foundations of China (52425206, 22361132525, 12474398), Guangdong Provincial Science & Technology Project (2023A0505050084), and China Postdoctoral Science Foundation (No. 2024M760954).
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