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a) Photograph of colloidal solution of Cs3Cu2 X 5 (X = Cl, Br, I) NCs in hexane under UV light (λ = 254 nm). b) Normalized absorption and PL spectra, and c) TRPL decay dynamics of the Cs3Cu2 X 5 NCs. d) PLQY stability of Cs3Cu2I5 NCs in ambient atmosphere.
