Synthesis and Optical Properties of GaOOH and Ga_2O_3

GaOOH precursors with different morphologies and sizes were synthesized by hydrothermal method.The products were characterized by XRD,SEM and the probable growth mechanism of GaOOH was analyzed.The pH values played a dominated role in adjusting GaOOH morphologies and had an effect on their crystallizations.The GaOOH precursors were calcined in air and transformed into α-Ga2O3 and β-Ga2O3 under 600 ℃ and 900 ℃,respectively.The samples after calcinations showed coincident morphology hereditability.Photoluminescence measurements(λex=250 nm) were conducted for the GaOOH and Ga2O3 samples and the emission peaks located at 415 nm and 465 nm when pH=5,however,at 370 nm and 465 nm for pH=3 and 8.