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Herein, a solution method is used to synthesize lead‐free Cs3Sb2Br9 perovskite microplatelets. The freshly prepared microplatelets exhibit photoluminescence (PL) peaks at about 420 and 600 nm, when the excitation wavelengths are 325 and 532 nm, respectively. The 420 nm PL band is attributed to the band edge excitonic recombination while the 600 nm PL band originates from radiative defect state. The...