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In this work, we explored a series of 2-dimentional perovskites by halide substitution in combination
with the use of two different long-chain organic cations. A combination of hyperspectral photoluminescence
imaging and elemental mapping measurements were performed to understand the microscale distribution
emissive species in these films. lmaging of the emission and chemical mapping allowed us to demonstrate
that a careful contrai of the halide mixture in 2D perovskites can drive a microscale distribution of
phases. We demonstrated how by playing with halide composition and organic moieties, it is possible to
contrai the microscale segregated domains’ size and their emission distribution.