Figure 5From: A study of photoluminescence properties and performance improvement of Cd-doped ZnO quantum dots prepared by the sol–gel methodEmission spectra of ZnO QDs with different concentrations of Cd. (A) 318-nm and (B) 365-nm excitation. (a) 0.0%, (b) 2.0%, (c) 5.0%, (d) 10.0%, (e) 20.0%.Back to article page