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The A site of zero-dimensional (0D) metal halides A₃BiCl₆ can be replaced by Cs and/or K, thus, four possible 0D A₃BiCl₆ forms exist, such as (Cs₂K)BiCl₆, (CsK₂)BiCl₆, K₃BiCl₆ and Cs₃BiCl₆. It is well known that Cs₃BiCl₆ has been reported. We predict that both (Cs₂K)BiCl₆ and K₃BiCl₆ do not have enough structural and thermodynamic stability, but (CsK₂)BiCl₆ should be a 0D stable A₃BiCl₆ candidate based on density functional theory (DFT). Furthermore, 0D (CsK₂)BiCl₆ metal halide was experimentally prepared by the solvothermal method. Though (CsK₂)BiCl₆ metal halide exhibits an indirect bandgap and poor luminescence properties, the emission can be boosted by B-site Mn-doping due to the efficient energy transfer from self-trapped excitons (STE) to the d-state of Mn ions. Our results enrich the family of 0D bi-based metal halides and provide guidance for the regulation of the structural and optical properties of metal halides.