Publication date: 15th July 2022
Nature's drive necessitates green chemistry. As a result, the ultimate goal of all research fields is to achieve environmental sustainability. Solvents are a substantial contributor to the overall toxicity profile; as a result, they make up the majority of the components of concern in a process. Thus, the use of diverse green solvents in chemistry is becoming a growing sector for substituting conventional organic hazardous solvents in a variety of applications. In all of these sectors, ionic liquids are leading the way, but a new class of solvents known as deep eutectic solvents (DES) is quickly gaining ground.[1] Herein we demonstrate a novel method of synthesizing pure inorganic CsPbX3 (X=Cl, Br, or I) nanocrystals in environment-friendly menthol-based DES medium, which largely reduces the synthesis-related toxicity that mostly originates from the use of organic precursor solvents.[2,3] The effects of different carboxylic acid chain lengths in the DES medium on the optical properties of CsPbX3 NCs were investigated. The synthesized NCs show moderately high photoluminescence quantum yield (PLQY) (CsPbBr3 NC with a maximum PLQY of 78%). The tuning of reaction temperature and cesium to lead precursor ratio yields in the formation of Ruddlesden-Popper Quasi 2D Cesium Lead Bromide Perovskite nanoplatelets (NPLs) with different layer thickness (n=3 to ∞). The synthesized NCs/NPLs also found to have halide vacancies that lead to the low PLQY of the system and near-unity PLQY can easily be achieved through post-synthetic oleylammonium halide treatment.
Shovon Chatterjee and Arghya Sen acknowledge IIT Kanpur for providing fellowships. Pratik Sen thanks IIT Kanpur for funding and infrastructure.
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