3.6 PL emission
PL emission (Fig. 6) of CTS synthesized by 800W microwave
refluxing method in EG for 60 min was determined
using 300 nm excitation wavelength at room temperature.
The emission peak of the 3D-hierarchical flower-like CTS
was detected at 366 nm wavelength (3.39 eV), due to the
interband electron-hole recombination process. It should be
noted that the transition between bands could involve
electronic levels in the vicinity to the bottom of the lowest
empty band and at the top of the highest occupied band.23)