Optical and electron paramagnetic resonance studies of Cr doped Ga2O3 nanoparticles

In the present work we report the experimental results obtained on Ga2O3 nanoparticles doped with Cr ions. X-ray diffraction analysis confirms the substitution of Ga ions with Cr ions. A secondary phase of Cr2O5 oxides was evidence at high doping Cr concentration by Raman spectroscopy. Different valence state of Cr ions was highlighted by UV-VIS spectroscopy. EPR spectroscopy data show the presence of different environments for Cr ions, depending on the Cr addition.