Tellurium-Doped 0D Organic-Inorganic Hybrid Lead-Free Perovskite for X-ray Imaging

The application of X-ray imaging in military, industrial flaw detection, and medical examination is inseparable from the wide application of scintillator materials. In order to substitute for lead, lower costs, and reduce self-absorption, organic-inorganic hybrid lead-free perovskite scintillators are emerging as a new option. In this work, novel (TEA)₂Zr_1-TeCl₆ perovskite microcrystals (MCs) were successfully synthesized by a hydrothermal method, with Te⁴⁺ doping, which leads to yellow triplet-state self-trapped excitons emission. The emission peak of (TEA)₂Zr_1-TeCl₆ located at 605 nm under X-ray excitation, which was applied to X-ray imaging, shows a clear wiring structure inside the USB connector. The detection limit (DL) of 820 nGy_air/s for (TEA)₂Zr_0.9Te_0.1Cl₆ is well below the dose rate corresponding to a standard medical X-ray diagnosis is 5.5 μGy_air/s. This work opens up a new path for organic-inorganic hybrid lead-free scintillators.