Synthesis and Luminescence Properties of La2O2S:Eu3+ Nanobelts Derived from La2O3:Eu3+ Nanobelts

La2O2S:Eu3+ nanobelts were prepared by electrospinning combined with a double-crucible sulfurization technique using sulfur powders as sulfurizing agent. The morphology and properties of the products were investigated in detail by X-ray diffraction (XRD), scanning electron microscopy (SEM) and fluorescence spectrometry. XRD analysis indicated that La2O2S:Eu3+ nanobelts were pure hexagonal phase with space group P (3) over bar m1. SEM analysis and particle size distribution revealed that widths of La2O2S:Eu3+ nanobelts were 3.47 +/- 0.62 mu m under the 95% confidence level. Emission spectra show that La2O2S:Eu3+ nanobelts emit yellow light at 539 nm. This luminescence band is attributed to D-5(1) -> F-7(1) energy levels transition of Eu3+ ions. CIE analysis demonstrated that the emitted light color is located in the yellow region and color-tuned luminescence can be obtained by changing concentration of Eu3+ dopant ions. The obtained material can be applied in the field of optical telecommunication and optoelectronic devices. The possible formation mechanism of La2O2S:Eu3+ nanobelts was also proposed.