All-Inorganic Lead-Free Heterometallic Cs4MnBi2Cl12 Perovskite Single Crystal with Highly Efficient Orange Emission
Summary A luminescent all-inorganic manganese-bismuth heterometallic Cs 4 MnBi 2 Cl 12 perovskite single crystal has been synthesized with a [BiCl 6 ] 3− -[MnCl 6 ] 4− -[BiCl 6 ] 3− triple-layered two-dimensional structure. Benefit from the effective energy transfer from [BiCl 6 ] 3 − octahedron donor to luminescent [MnCl 6 ] 4− acceptor, Cs 4 MnBi 2 Cl 12 shows a photoluminescence quantum yield (PLQY) of up to 25.7% (~610 nm), 51-fold higher than the Bi unalloyed CsMnCl 3 ·2H 2 O counterpart. Suggested by the theoretical calculations, Bi and Mn exhibit hybridization in conduction and valence band, which further results in a favorable low activation energy for exciton transfer (~23 meV). By virtue of all-inorganic chemical composition, Cs 4 MnBi 2 Cl 12 exhibits impressive stability toward moisture, light, and heat. Furthermore, Cs 4 MnBi 2 Cl 12 features strong soft X-ray attenuation and bright radiative luminescence under X-ray excitation, which pave a way for its application in medical flat-panel X-ray digital radiography. This work presents a new avenue toward fabrication of function-directed material with tailored photoelectric properties.
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