Eco‐Friendly and Highly Efficient Light‐Emission Ferroelectric Scintillators by Precise Molecular Design (adv. Funct. Mater. 35/2021)

Hybrid manganese halide has attracted much attention in the field of environment friendly ferroelectric and photo-responsive multifunctional materials. Here, the highly efficient photoluminescent inorganic framework MnBr42- is utilized to conceive and synthesize a series of hybrid manganese bromide compounds [RQ](2)MnBr4 by introducing precisely designed quasi-spherical cations [RQ](+) (R = H, Me, Et, FEt, Q = quinuclidine). The accurate and effective modification of cations not only achieves the satisfactory ferroelectricity, but also enhances the photoluminescence quantum yield from 38.7% to 83.65%. Moreover, [FEtQ](2)MnBr4 shows a highly efficient X-ray scintillator performance, including a large range of linear response to X-ray dose rate from 0.3 to 414.2 mu Gy(air) s(-1), a high light yield of 34 438 photons per MeV, and a low detection limit of 258 nGy(air) s(-1). This work provides an efficient strategy for the preparation of hybrid manganese halide ferroelectrics with highly efficient light-emission and X-ray detection.