Figure 3.

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

Yang et al. Nanoscale Research Letters 2009 5:247-251   doi:10.1007/s11671-009-9473-9