Figure 3From: Ultraviolet Laser Action in Ferromagnetic Zn1−x Fe x O NanoneedlesLasing 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 I th represents the lasing threshold. d Light–light curves of the undoped ZnO, Zn0.989Fe0.011O, and Zn0.983Fe0.017O NDsBack to article page