Influence of hydrothermal reaction time on crystal qualities and photoluminescence properties of β-Ga2O3 nanorods

Abstract

The β-Ga2O3 nanorods were synthesized by the hydrothermal method, which were characterized in detail so as to explore the effects of the hydrothermal time on their final morphologies and photoluminescence properties. The X-ray diffraction pattern indicates that the synthesized GaOOH precursor is completely converted into the monoclinic β-Ga2O3 phase. The microscopic analysis shows that the single crystal β-Ga2O3 samples are of a slender shape, i.e., nanorods and microrods. The main element composition and their valence states were detected by X-ray photoelectron spectroscopy, whose result is consistent with that of XRD. The Raman spectrum for the sample obtained at the hydrothermal time of 10 h has the highest intensity and narrowest full width at half-maximum that indicates the highest crystallinity. The photoluminescence spectra show that the emission peaks of the three samples appear in the blue-violet region between 375 and 425 nm, which are greatly affected by the hydrothermal time.