Authors: Yuhai Zhang, Banavoth Murali, Makhsud I Saidaminov, Ibrahim Dursun, Haoze Yang Erkki Alarousu, Emre Yengel, Buthainah A Alshankiti, Osman M Bakr, Omar F Mohammed.
Keywords: Zero-Dimensional,Perovskite Nanocrystals.
Year: J. Phys. Chem. Lett., 2017, 8 (5), pp 961–965
Abstract: Perovskite nanocrystals (NCs) have become leading candidates for solution-processed optoelectronics applications. While substantial work has been published on 3-D perovskite phases, the NC form of the zero-dimensional (0-D) phase of this promising class of materials remains elusive. Here we report the synthesis of a new class of colloidal semiconductor NCs based on Cs4PbBr6, the 0-D perovskite, enabled through the design of a novel low-temperature reverse microemulsion method with 85% reaction yield. These 0-D perovskite NCs exhibit high photoluminescence quantum yield (PLQY) in the colloidal form (PLQY: 65%), and, more importantly, in the form of thin film (PLQY: 54%). Notably, the latter is among the highest values reported so far for perovskite NCs in the solid form. Our work brings the 0-D phase of perovskite into the realm of colloidal NCs with appealingly high PLQY in the film form, which paves the way for their practical application in real devices.