Publication date: 2nd November 2020
Cesium Lead Halide perovskite nanocrystals (NCs) CsPbX3 (X=Cl,Br,I) have been prominent materials from last few years due to their high photoluminescence quantum yield (PLQY) owing for light emitting diodes (LEDs) and other significant applications in photovoltaic and optoelectronics. Meanwhile, there is still a challenge of maintaining its photo-stability and PLQY which degrades because of ligand loss via proton transfer between oleic acid and oleylamine (commonly used surface capping ligands). In this presentation we will discuss, a facile and efficient completely amine- free synthesis of cesium lead bromide perovskite nanocrystals using hydrobromic acid as halide source and n-trioctylphosphine (TOP) as ligand in open atmospheric conditions. The use of hydrobromic acid helped to eliminate oleylamine, thus we can completely exclude the formation of labile oleylammonium ion halide. These completely amine free CsPbBr3 perovskite NCs synthesized using bromine-rich condition ( excess HBr) exhibit good stability and durability for more than three months in the form of colloidal solutions and films respectively. This amine free CsPbBr3 NCs films exhibiting high photoluminescence (PL) at open atmospheric conditions which can be further used for opto- electronic device applications.
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