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Inorganic CsPbX3 perovskite quantum dots (PeQDs) show great potential in white light‐emitting diodes (WLEDs) due to excellent optoelectronic properties, but their practical application is hampered by low photoluminescence quantum yield (PLQY) and especially poor stability. Herein, we developed an in‐situ and general multidentate ligand passivation strategy that allows for CsPbX3 PeQDs not only near‐unit...