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Lasing emission spectra obtained from a undoped ZnO NDs, b Zn0.989Fe0.011O NDs, and c Zn0.983Fe0.017O NDs under different pumping density where the Ith represents the lasing threshold. d Light–light curves of the undoped ZnO, Zn0.989Fe0.011O, and Zn0.983Fe0.017O NDs
