LAUSR

β-Ga2O3 microspheres were synthersized by hydrothermal method. The products were characterized in detail to detect the effects of the hydrothermal temperature on their morphology, crystalline quality and photoluminescence properties. The lattice vibrational characteristics of β-Ga2O3 samples were analyzed by Raman and far infrared spectroscopy. The ultraviolet (UV) photoluminescence was observed for the final β-Ga2O3 products. The emission peaks are observed in the blue-violet region between 350 and 450 nm and are greatly influenced by the hydrothermal temperatures. The blue-violet emission may be due to the trapped exciton, which are formed by the recombination of an electron in donor level and a hole on an acceptor level. The weak UV peaks at around 250 nm are derived from the recombination of self-trapped excitons. The highest luminescence intensity of the β-Ga2O3 is observed in the sample synthesized at 120 ℃, which may be due to the highest defect concentration.