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A room‐temperature supersaturated recrystallization method is developed on page 2435 by H. Zeng and co‐workers, to rapidly synthesize all‐inorganic halide perovskite quantum dots with blue, green, and red luminescent quantum yields of 70–95% and line‐widths less than 35 nm. The origins of the optical superiority are proposed to be the 40 meV exciton binding energy, surface self‐passivation, and quantum‐well band alignment, leading to promising potential in healthy lighting and wide‐color‐gamut displays. [ABSTRACT FROM AUTHOR]