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Perovskite light‐emitting diodes (PeLEDs) have shown incalculable application potential in the fields of next‐generation displays and light communication owing to the rapidly increased external quantum efficiencies (EQEs). However, most PeLEDs obtain a maximum EQE at small current density (J) region and suffer from severe efficiency roll‐off in different extents. Herein, it is demonstrated that the...