Organic–Inorganic Hybrid Halide X-ray Scintillator with High Antiwater Stability

In recent years, low-dimensional organic-inorganic hybrid metal halides have garnered significant attention for optoelectronic applications due to their exceptional photophysical properties, despite their persistent challenge of low stability. Addressing this challenge, our study introduces 1-[5-(trifluoromethyl)pyridin-2-yl]piperazinium (TFPP) as a cation, harvesting a novel one-dimensional hybrid cadmium-based halide semiconductor (TFPP)CdCl₄, which exhibits intense blue-light emission upon UV excitation. Additionally, (TFPP)CdCl₄ demonstrates a high scintillation performance under X-ray excitation, producing 16600 ± 500 photons MeV^-1 and achieving a low detection limit of 0.891 μGy_air s^-1. Notably, (TFPP)CdCl₄ showcases remarkable stability against water, intense light sources, heating, and corrosive environments, positioning it as a promising candidate for optoelectronic applications. Through a blend of experimental techniques and theoretical analyses, including density functional theory calculations, we elucidate the unique photophysical properties and structural stability of (TFPP)CdCl₄. These findings significantly contribute to the understanding of low-dimensional hybrid halide semiconductors, offering valuable insights into their potential application in advanced optoelectronic devices and paving the way for further research in this field.