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White light‐emitting diodes (WLEDs) are the key components in the next‐generation lighting and display devices. The inherent toxicity of Cd/Pb‐based quantum dots (QDs) limits the further application in WLEDs. Recently, more attention is focused on eco‐friendly QDs and their WLEDs, especially the phosphor‐free WLEDs based on mono‐component, which profits from bias‐insensitive color stability. However,...