Eu~(3+)掺杂ZnO-MgO-La_2O_3-B_2O_3基发光光纤的弹脆塑性

Elastic-Brittle-Plasticity of Luminescence Fibers of Eu~(3+) Doped ZnO-MgO- La_2O_3-B_2O_3

摘要:

采用高温固相反应法制备了Eu3+掺杂ZnO-MgO-La2O3-B2O3基质的光致发光光纤,通过轴向拉伸试验测量了该光纤的应力-应变曲线。应用弹脆塑性理论研究了屈服面的变化和应力-应变的本构关系,计算了拉伸弹性模量、拉伸强度、拉伸最大负荷、拉伸强度的应变、断裂伸长率和材料的脆性指数。结果表明,该光纤弹性模量高于普通玻璃和大理石,接近于硬铝合金和轧制铝,其拉伸强度和所能承载的负荷都较大。

Abstract:

Luminescence fibers of Eu3+ doped ZnO-MgO-La2O3-B2O3 were prepared by solid state reaction at high temperatures. Their diameters were in the range of 0.01 mm~0.30 mm and their lengths were more than 10 m. Their curves of stress-strain were measured by the axial extension test. The change of the yield surface and the constitutive relations of the stress-strain were investigated based on the theory of elastic-brittle-plastic. Their elastic modulus, intensity, stress peak load, strain of stress intensity, elongation ratio to rupture of the axial extension, and brittleness index of the material were calculated. It is found that their strong emission band of Eu3+ with a maximum at 614 nm belongs to the electric dipole transition of 5D0-7F2 and the emission at 581 nm with 40% relative intensity to 614 nm belongs to magnetic dipole transition of 5D0-7F1. The host emission peak presenting to 438 nm overlaps its excitation band. The result shows that their elastic modulus are higher than those of common glass and marble, close to hard aluminum alloy and rolled aluminum. Their stress intensity and peak load are relatively big.