After effective passivation, nonradiative recombination is greatly suppressed, which enables resulting films to exhibit outstanding photoluminescence quantum yields in a broad range of excitation density. Recombination kinetics reveal the Auger recombination rate does decrease to one-order-of magnitude lower compared to its PEA + analogues. Here, a polar molecule, p-fluorophenethylammonium, is employed to generate quasi-2D perovskites with reduced E b. Thus, Auger recombination can be suppressed by reducing the corresponding materials’ E b. In principle, Auger recombination rate is proportional to materials’ exciton binding energy ( E b). Rapid Auger recombination represents an important challenge faced by quasi-2D perovskites, which induces resulting perovskite light-emitting diodes’ (PeLEDs) efficiency roll-off.
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