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The colloidal synthesis of a new type of lead‐free halide quadruple‐perovskite nanocrystals (NCs) is reported. The photoluminescence quantum yield and charge‐carrier lifetime of quadruple‐perovskite NCs can be enhanced by 96 and 77‐fold, respectively, via metal alloying. Study of charge‐carrier dynamics provide solid demonstrate that the PL enhancement is due to the elimination of ultrafast (1.4 ps)...
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