N-Bromosuccinimide as Bromide Precursor for Direct Synthesis of Stable and Highly Luminescent Green-Emitting Perovskite Nanocrystals

Stable green-emitting perovskite nanocrystals (NCs) with general formula APbBr(3), exhibiting a high photoluminescence quantum yield (PLQY), narrow bandwidth, and adjustable PL in the 510-535 rim region are coveted materials for optoelectronic applications. A generic method of obtaining both hybrid and all-inorganic perovskite NCs with the desired characteristics is, however, lacking. Herein, we report a methodology for the synthesis of CsPbBr3, FAPbBr(3), and MAPbBr(3) NCs employing N-bromosuccinimide as the bromide precursor. The NCs show uniform size distribution, PL maxima between 512 and 531 nm, near-unity PLQY with a fwhm of 18-22 nm, and remarkable stability in ambient conditions, in the presence of water and under UV irradiation. Not only do these exceptional characteristics of the NCs indicate their high potential in real applications, but this new methodology may also open new vistas for direct synthesis of other perovskites with high PLQY and stability without resorting to any additional postsynthesis treatment.