Structure and photoluminescence of β-Ga2O3:Eu3+ nanofibers prepared by electrospinning

Eu3+-doped β-Ga2O3 nanofibers were fabricated by electrospinning. The influence of Eu3+ concentration on the photoluminescence properties of the obtained nanofibers was investigated. The morphology and structure of β-Ga2O3:Eu3+ were characterized by field emission scanning electron microscopy (FE-SEM), X-ray diffraction (XRD) and Raman spectra. The diameter of the Eu3+-doped β-Ga2O3 nanofibers was in the range of 180–300 nm. When the β-Ga2O3:Eu3+ nanofibers were excited by 325 nm wavelength, the main emission peak of the samples was 620 nm (5D0→7F2), which corresponded to a typical red emission (5D0→7Fj (j = 1, 2, 3, 4) intra-4f transitions of Eu3+ ions). In addition, the concentration quench effect and energy transfer mechanism in β-Ga2O3:Eu3+ were also discussed.