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Reduced-dimensional CsPbBr$_3$ nanoplatelets (NPLs) are promising candidatesfor color-saturated blue emitters, yet their electroluminescence performance ishampered by non-radiative recombination, which is associated with brominevacancies. Here, we show that a post-synthetic treatment of CsPbBr$_3$ NPLswith GdBr$_3$-dimethylformamide (DMF) can effectively eliminate defects whilepreserving the color. According to a combined experimental and theoreticalstudy, Gd$^{3+}$ ions are less reactive with NPLs as a result of compactinteraction between them and DMF, and this stable Gd$^{3+}$-DMF solvationstructure makes Brions more available and allows them to move more freely.Consequently, defects are rapidly passivated and photoluminescence quantumyield increases dramatically (from 35 to ~100%), while the surface liganddensity and emission color remain unchanged. The result is a remarkableelectroluminescence efficiency of 2.4% (at 464 nm), one of the highest in pureblue perovskite NPL light-emitting diodes. It is noteworthy that the conductiveNPL film shows a high photoluminescence quantum yield of 80%, demonstratingNPLs' significant electroluminescence potential with further device structuredesign.

Gd-Based Solvated Shells for Defect Passivation of CsPbBr$_3$ Nanoplatelets Enabling Efficient Color-Saturated Blue Electroluminescence