Zn²⁺ Doping in Organic Manganese(II) Bromide Hybrid Scintillators toward Enhanced Light Yield for X‐Ray Imaging

Abstract Metal halide scintillators have drawn great interest for X‐ray imaging; however, it remains challenging to simultaneously achieve a high light yield (LY) and highly sensitive detection. Herein, Zn²⁺ is successfully introduced into [TPPen]₂MnBr₄ (TPPMB, TPPen = pentyltriphenylphosphonium) and the synthesis of [TPPen]₂Mn_0.9Zn_0.1Br₄ (TPPMZB) is designed. The LY increases from 43 000 for TPPMB to 68 000 photons MeV⁻¹ for TPPMZB in virtue of the Zn atom doping. Additionally, the detection limit of TPPMZB is 204.1 nGy s⁻¹, showing great improvement to that of TPPMB with the value of 696.9 nGy s⁻¹. X‐ray imaging is realized by utilizing the large‐scale scintillator film fabricated by mixing polydimethylsiloxane with TPPMZB or TPPMB, and the spatial resolution is enlarged from 4.6 to 11.2 lp mm⁻¹ after Zn²⁺‐doping. This study provides a design principle by doping engineering for enhancing the LY property of metal halide X‐ray scintillators.