d 2 Ion-Doped Vacancy-Ordered Double Perovskites as Broadband NIR Scintillators for Radiation Detection

Abstract

Scintillators can convert high-energy X-rays into more easily observable visible-near-infrared (NIR) light, thus showing great application potential in fields such as medical imaging, industrial inspection, and high-energy physics. Current NIR photodiodes have a much higher photoelectric conversion efficiency than those for visible light. Integrating NIR scintillators with NIR optoelectronic conversion devices exhibiting high photoelectric conversion efficiency represents a promising solution for achieving efficient X-ray detection. However, almost all current scintillators are limited to the visible light region or exhibit poor performance. In this work, we achieve efficient NIR scintillation by doping Cs2ZrCl6 with d² ions. The light yield (LY) of the sample is as high as 51613 photons⋅MeV-1, and the detection limit is as low as 192 nGyair⋅s-1. The flexible scintillator film with an area of 10×10 cm2 prepared by combining the sample with PDMS can be successfully applied to X-ray imaging. The spatial resolution of the Cs2ZrCl6: Mo4+@PDMS scintillator screen was 10 lp⋅mm-1 determined by the result of standard X-ray resolution test panels imaging and MTF = 0.2. This work demonstrates that vacancy-ordered double perovskite is a promising matrix for scintillators and a class of potential optically functional materials.