To verify the effect of crystallinity of the products on UV emission wavelength, the Room Temperature Photo Luminescence spectra were recorded at the excitation wavelength of 325 nm for the nano ZnO rods A2 and A3 with Xe light as the excitation source.
In Fig. 6, the PL spectrum for synthesized nano rods A2 and A3 consists of high intense peaks centered at 378.35 nm and 380.34 nm and peaks at 408 nm (NBE).
The PL signal at 400 nm is a typical ZnO UV emission wave-
length [27].
It was observed that the UV emission peaks at 380.34 nm and 408 nm of the A3 rods have higher intensity (337.3/au and 256/au) compared to those of A2 rods (302.2/au and 207/au). This also confirms the data obtained from XRD that A3 rods have high crystallinity.
The PL spectrum also has two weak emission peaks at 474 nm and 518 nm. The UV emission