柔性Eu3+掺杂SiO2纳米纤维薄膜的制备及其发光性能

采用溶胶-凝胶法结合静电纺丝技术制备了柔性Eu³⁺掺杂SiO₂纤维薄膜, 采用SEM、XRD、FT-IR、TG和PL等测试方法对材料进行表征。Eu³⁺掺杂SiO₂纤维薄膜在热处理后纤维直径变小, 纤维表面平滑无粘连。通过控制升温速度, 纤维薄膜经热处理后仍具有较高的力学强度, 750℃热处理后其拉伸强度可达4.31 MPa, 经过多次弯曲仍能保持原样。在392.6 nm光源激发下, Eu³⁺掺杂SiO₂纤维薄膜在570~670 nm附近呈现出来自于⁵D₀→⁷F_J的发射峰。当Eu³⁺掺杂浓度为8mol%时, 经过750℃热处理后Eu³⁺掺杂SiO₂纤维薄膜的发光强度达到最大值。

Preparation and Luminescence Properties of Flexible Eu3+ Doped SiO2 Fibrous Membranes

Eu³⁺ doped SiO₂ fibrous membranes were prepared by Sol-Gel and electrospinning methods. The obtained samples were chacterized by SEM, XRD, FT-IR, TG, PL, etc. By heat-treatment, the organic components were removed slowly and the diameters of the Eu³⁺ doped SiO₂ fibers decreased. SEM images exhibit that the surface of the fibers retains smooth and uniform after heat-treatment. By controlling the heating rate, the Eu³⁺ doped SiO₂ fibrous membranes present relatively high tensile strength at about 4.31 MPa after heat-treatment at 750℃. The samples exhibit no cracks after bending and recovering process. By excited by 392.6 nm light, the emission peaks between 570-670 nm are observed, which attributes to the ⁵D₀→⁷F_J transition. The strongest emission peak situates at 616 nm results from Eu^{3+ 5}D₀→⁷F₂ transition. The optimal heat-treatment temperature is 750℃. PL spectra also show that the luminescence intensity attains the highest value at the concentration of 8mol% Eu³⁺ doped.