Synthesis and characteristics of pure β-Ga2O3 and Tb3+ doped β-Ga2O3 hollow nanostructures

Abstract The pure β -Ga 2 O 3 and Tb 3+ doped β -Ga 2 O 3 hollow nanostructures with various Tb 3+ concentrations were prepared by hydrothermal and cacination processes. The X-ray diffraction patterns indicate that the core-shell structures are amorphous phase before calcination and perfectly crystallized β -Ga 2 O 3 hollow nanostructures were obtained at 800 °C. The sharp and intense band absorption at 1384 cm −1 , which was attributed to the Ga(OH)CO 3 shell, was observed by Fourier transform infrared. Field-emission scanning electron microscopy and high-resolution transmission electron microscopy investigations showed β -Ga 2 O 3 hollow nanostructures with diameters of about 200 nm and thicknesses of about 20~30 nm. The green emission spectra of Tb 3+ doped β -Ga 2 O 3 hollow nanostructures as a function of Tb 3+ ions were observed due to the 5 D 4 → 7 F J transition. The Tb 3+ -doped β -Ga 2 O 3 hollow nanostructures showed the highest green emission intensity at 7 mol% of Tb 3+ ions.