All-Inorganic Lead-Free Heterometallic Cs4MnBi2Cl12 Perovskite Single Crystal with Highly Efficient Orange Emission

A luminescent all-inorganic manganese-bismuth heterometallic Cs4MnBi2Cl12 perovskite single crystal has been synthesized with a [ BiCl6](3)--[MnCl6](4)--[BiCl6](3)-triple-layered two-dimensional structure. Benefit from the effective energy transfer from [BiCl6](3)-octahedron donor to luminescent [MnCl6](4)-acceptor, Cs4MnBi2Cl12 shows a photoluminescence quantum yield (PLQY) of up to 25.7% (similar to 610 nm), 51-fold higher than the Bi unalloyed CsMnCl3 center dot 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 (similar to 23 meV). By virtue of all-inorganic chemical composition, Cs4MnBi2Cl12 exhibits impressive stability toward moisture, light, and heat. Furthermore, Cs4MnBi2Cl12 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.