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We have studied the optical and structural properties of CsPbBr 3 perovskite nanocrystals (NCs) fabricated with various reaction times. The temporal evolution of the ensemble optical properties, such as absorption and fluorescence (FL) spectra and photoluminescence quantum yield (PLQY), was recorded under a set reaction temperature (170 ∘ C) and various amounts of time (5 s -60 min). The FL intensity of the CsPbBr 3 NCs gradually decreased with increasing reaction time, and the observed PLQY ofdoi:10.5757/asct.2021.30.5.152 fatcat:vgmmaw6trvd6fmpgjlrzpfancy