Solvent co-assembly in lead-free perovskite scintillators for stable and large-area X-ray imaging. Issue 30 (13th July 2022)

• Record Type: Journal Article
• Authors: Liu, Lulu; Li, Weijun; Pan, Wanting; Wei, Haotong; Yang, Bai
• Is Part Of: Journal of materials chemistry. Volume 10:Issue 30(2022)
• Page Start: 15990
• Page End: 15998
• Publication Date: 2022-07-13
• Subjects: Materials -- Research -- Periodicals; Chemistry, Analytic -- Periodicals; Environmental sciences -- Research -- Periodicals; 543.0284
• DOI: 10.1039/d2ta03468a
• Languages: English
• ISSNs: 2050-7488

Abstract

Abstract : We report two 0D lead-free perovskite structures co-assembled from solvent molecules. The solvent co-assembled perovskite single-crystal exhibits excellent moisture stability and the wafer shows potential applications in large area X-ray imaging. Abstract : Perovskite scintillators have emerged as good candidates for next-generation X-ray detectors due to their excellent scintillation efficiency and controllable properties by compositions. However, moisture stability and large-area X-ray imaging are still major concerns. Here, we report two 0D lead-free perovskite structures with different ionic arrangements formed by co-assembling solvent molecules with perovskite ions. Different solvent molecules of hydrogen oxide (H2 O) and acetonitrile (CH3 CN) were self-assembled into a crystal lattice to modulate the ion arrangements of two new single crystals 4-diethylaminobenzoic acid manganese(ii ) bromide hydrogen oxide ((DABA)2 MnBr4 ·H2 O) and 4-diethylaminobenzoic acid manganese(ii ) bromide acetonitrile ((DABA)2 MnBr4 ·CH3 CN). The solvent co-assembled perovskite single crystal exhibits excellent moisture stability under ambient conditions for one month without any encapsulation, and is a good candidate for a low-cost and high-performance scintillator. The multiple supramolecular interactions within the two single crystals offer efficient driving forces for self-assembly, and the excitons are better confined in the (DABA)2 MnBr4 ·H2 O crystals than that in (DABA)2 MnBr4 ·CH3 CN crystals, resulting in a higher photoluminescence (PL) quantum yield of 51%. The light yield of (DABA)2 MnBr4 ·H2 O to 120 keV can reach 28 333 photons MeV −1 . In addition, constructed strong hydrogen bonds in (DABA)2 MnBr4 ·H2 O ensure good capability to suppress thermal PL quenching due to the reduced electron-phonon interactions. Large-area scintillators with a dimension size of 2.4 cm × 3.0 cm exhibit comparable X-ray imaging capability with spatial resolutions up to 5.0 lp mm −1, providing a new design route for the perovskite scintillator family.