Fig. 3: Size-dependent exciton radiative lifetimes and rates of CsPbBr3 nanocrystals.
From: Non-monotonic size-dependent exciton radiative lifetime in CsPbBr3 nanocrystals
a Measured total lifetime under ambient conditions along with calculated radiative lifetimes via the absolute photoluminescence quantum yield (PLQY) as a function of nanocrystal size exhibit an unexpected non-monotonic trend. Larger nanocrystals in weak confinement regime show lengthened radiative lifetimes that decrease as the nanocrystal size transition into the intermediate confinement regime. Surprisingly, the trend reverses with decreasing nanocrystals size reaching the strong confinement regime. b radiative rates, the inverse of radiative lifetimes, showcasing an optimal size associated with maximum radiative rate.
