All-inorganic perovskite quantum dots (PeQDs) have gained much attention in the field of wide-color-gamut display application. In recent years, green and red perovskite quantum dot light-emitting diodes (PeQDLEDs) have achieved great improvement of efficiency. However, the performance of the blue PeQDLEDs still struggle to keep pace with that of green and red counterparts, mainly due to the low photoluminance quantum yield (PLQY) of blue PeQDs. Herein, we report a strategy of doping Mn2+ into CsPbBrxCl3-x PeQDs to remove the defects, leading to the fourfold improvement of the PLQY. Benefiting from the highly luminous Mn2+-doped PeQDs, the PeQDLED shows the maximum EQE of 1.3% and the corresponding electroluminance (EL) is located at 468 nm. Our work would open the door to achieve highly efficient blue PeQDLEDs.
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