0D Organic Manganese(II) Bromide Hybrids as Stable and Efficient X‐Ray Scintillator

Abstract

Low‐dimensional organic–inorganic hybrids have emerged as promising X‐ray scintillators due to efficient radioluminescence properties. Herein, stable and efficient X‐ray scintillator based on 0D (C40H38P2)MnBr4 hybrid single crystals grown by a facile solution‐processing method is reported. Its crystal structure is determined to be triclinic with P space group. It has good stability against moisture and irradiation. (C40H38P2)MnBr4 with tetrahedrally coordinated Mn2+ exhibits green emission peaking at 518 nm originating from d–d 4T1→6A1 transition of Mn2+ ion with a high photoluminescence quantum yield (PLQY) of 74.2%. Under X‐ray excitation, it shows high scintillation yield of 32 000 photons MeV−1, a decent detection limit of 288 nGyair s−1, and a low afterglow comparable to that of Bi4Ge3O12 (BGO).

Highly Emissive Chiral Mn(II) Bromide Hybrids for UV‐Pumped Circularly Polarized LEDs and Scintillator Image Applications

“…Noteworthily, the RL intensity ( I RL ) of 1 S has an excellent linear response to the X‐ray dose rates in the range from 0.32 to 1.62 mGy air s −1 (Figure 6b). Moreover, a slope of the corresponding linear plot (Figure 6b, inset) is larger or comparable with that of the best known Mn(II)‐derived scintillators, [ 58–61 ] thereby indicating a high sensitivity of 1 S to the X‐ray irradiation. The detection limit of X‐ray dose rate of 1 S has been estimated to be 320 µGy s −1 at the signal‐to‐noise ratio of about 5.…”

“…The data on Mn(II)-organic scintillators with efficient X-ray radioluminescence (RL) are now limited to a few recent works. [58][59][60][61] Meantime, RL of chiral metal-organic complexes, to our knowledge, have never been studied so far, although X-ray excitation could potentially generate CPL light with higher g lim factors as compared to those at convenient UV-pumping. Herein, we have discovered that the chiral hybrids 1R/1S at ambient temperature manifest a very strong RL coupled with remarkable X-ray robustness.…”

Lead‐free organic–inorganic hybrid scintillators for X‐ray detection

“…Manganese(II)-based OIHCs hold the features of low preparation cost and excellent photophysical properties, which are expected to become substitutes for lead(II)-based OIHC scintillators. [22,23] In general, manganese(II)-based OIHCs with different charge characteristics can be divided into ionic and neutral types (Figure 2). [24,25]…”

Molecular Sensitization Enabled High Performance Organic Metal Halide Hybrid Scintillator

“…[35][36][37] Recently, 0D organic metal halide hybrids containing highly luminescent metal halide polyhedrons have received great attention as scintillation materials. [1,2,[37][38][39][40][41] Our group reported for the first time the use of 0D (C 38 H 34 P 2 )MnBr 4 and (C 36 H 30 NP 2 ) 2 SbCl 5 for Xray scintillators. [1,2] The scintillation properties of these materials with great response linearity to dose rate, high light yields of up to 80000 Photons/MeV, and low detection limits of down to 72.8 nGy air s −1 , are generally better than those of halide perovskite nanocrystals and most of today's commercially available scintillators.…”