Li_2B_4O_7:Eu^(3+)荧光体的合成及表征

Preparation of Phosphors Li_2B_4O_7:Eu^(3+) in Ambient Air

利用Li2B4O7作为基质,掺杂稀土元素Eu3+,在空气中合成了Li2B4O7:Eu3+荧 光体.探讨了体系的烧结条件,分析了晶体结构,并研究了该体系的荧光性质.结果表明,体 系中同时存在着[BO4]和[BO3]结构;稀土离子Eu3+的发光以电偶极跃迁5D0-7F2为主,处 于非中心对称的格位上,并且可以很好地存在于基质中.

Li2B4O7:Eu3+ phosphors were synthesized by solid state reaction in ambient air. The optimum preparing conditions were studied and phase analyses were carried out by the powder XRD method. The luminescent properties of Li2B4O7:Eu3+ under ultraviolet light excitation were studied. The results show that the structure of the borate contains both [BO3] and [BO4] coordination polyhedra, the predominant emission of Eu3+ is 5D0-7F2 transition, demonstrating that the rare earth ions occupy the non-centrosymmetrical sites in Li2B4O7 and Eu3+ ion can be stable in the matrix.