Organic Manganese Halides with Near‐Unity Quantum Efficiency for High‐Resolution and Flexible X‐Ray Detection and Imaging

Abstract In this paper, two new organic manganese halides (pe‐ted) 2 MnX 4 (pe‐ted + = ethylphenyltriethylenediamine cation, X = Cl, Br) are synthesized, exhibiting green luminescence with near‐unity photoluminescence quantum efficiency. (pe‐ted) 2 MnBr 4 shows good linear response to X‐ray dose rate, with a high light yield of ≈62 000 photons MeV −1 and low detection limit of 1.376 µGy s −1 . Flexible scintillator film is prepared by blending with polydimethylsiloxane for high‐resolution imaging, with a low detection limit (5.173 µGy s −1 ), an excellent X‐ray imaging spatial resolution (18.0 lp mm −1 ) and an impressive X‐ray irradiation switching stability (3.6 mGy s −1 ). WLED of high color rendering index has also been fabricated. These findings represent an example of shapeable X‐ray scintillators, providing new possibilities for curved and 3D X‐ray imaging.