The incorporation of phenylethylammonium bromide (PEABr) into a fully inorganic CsPbBr perovskite framework led to the formation of mixed-dimensional perovskites, which enhanced the photoluminescence due to efficient energy funnelling and morphological improvements. With a PEABr : CsPbBr ratio of 0.8 : 1, PeLEDs with a current efficiency of 6.16 cd A and an EQE value of 1.97% have been achieved.
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