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Inorganic cesium lead halide perovskite nanocrystals are candidates for lighting and display materials due to their outstanding optoelectronic properties. However, the dissolution issue of perovskite nanocrystals in polar solvents remains a challenge for practical applications. Herein, we present a newly designed one‐step spin‐coating strategy to prepare a novel multicolor‐tunable CsPbX3 (X=Cl, Br,...