利用高温烧结法制备了铕/铋铕共掺硼硅酸盐玻璃系列样品,测量了样品的激发光谱、发射光谱和声子边带谱,利用Eu^3+离子作为探针进一步研究了敏化剂Bi^3+的掺入对Eu^3+发光的影响.结果表明:本文制作的玻璃样品的电子-声子耦合系数比以往报道过的硼铅等玻璃材料的值都要小,但在硼硅酸盐玻璃中掺入Bi^3+会使Eu^3+的无辐射跃迁概率增加;Bi^3+对Eu^3+有敏化作用,Bi^3+的掺入使材料的共价性增强,对称性降低,这又使得Eu^3+的发光整体变强.所以,在硼硅酸盐玻璃体系中,Eu^3+发光的增强不仅仅是由于Bi^3+对Eu^3+的能量传递,而是以上各因素综合作用的结果.
A series of samples about Eu^3+ doped, Bi^3+∶Eu^3+-codoped borosilicate glasses have been prepared by high-temperature sintering. The excitation spectra, emission spectra and the phonon sideband spectra of the samples were measured. The influence on the luminescence of Eu^3+ ions was discussed with Eu^3+ ions as probe when Bi^3+ions were doped. The results show that the electron-phonon coupling coefficient calculated in this study is smaller than those of borate-lead glasses and others reported before, but the probability of non-radiative transition of Eu^3+ ions is increased by the doping of Bi^3+ ions. The Bi^3+ ions can sensitize Eu^3+ ions, and when Bi^3+ ions are doped, the covalent property becomes bigger with the symmetry becoming smaller ,which enhances the luminescence intensity of Eu^3+ ions on the whole. Therefore, in the borosilicate glasses, the increase of luminescence intensity about Eu^3+ ions is the result of the combined action between the above factors,not simply because of the energy transition from Bi^3+ ions to Eu^3+ ions.