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2D hybrid organic-inorganic semiconductors (HOIS) are low-cost,self-assembled semiconductors that have proven to be vital for noveloptoelectronic devices due to their inherent stable excitons even at roomtemperature. 2D HOIS are chemically stable with respect to the 3D analogues,but their inherent anisotropy complicates their implementation in devices,including electroluminescence (EL) devices. We report on the synthesis,characterization, cathodoluminescence and EL of a new 2D HOIS, (4-fluorophenethylamine-H)2PbBr4, and its defect variations (DVs). The latter, incontrast to the pristine material, allow for the first time the simplefabrication of a prototype blue EL device by coating DVs on a conducting anodesubstrate and using a Ga/In droplet cathode. DVs' optimization can lead toimproved light emitting devices (LEDs) and the work here is expected to providethe incentive for utilizing HOIS DVs, as these are compatible with industrialscale synthesis. In contrast to the pristine iodine analogue, whose thin filmsreadily provide EL, only the DVs or mixtures with MoS2 nano-sized plateletsprovide EL, after careful deposition. These exhibit defects that disrupt theplanar non-conductive nature of the micrometric 2D HOIS platelets, usuallyaligned parallel to the substrate, thus, providing mechanisms for current flow.Finally, the choice of the fluorine-modified amine enhances the functionalityof the DVs as LED materials compared to using unmodified amine due to therepulsion among the amine tails, leading to stable decorated 2D inorganicsheets that are weakly bound.

Deep-blue light emitting diode based on defect variations of a 2D hybrid organic-inorganic low dimensional perovskite semiconductor