外力条件下TiO₂/Eu³⁺发光性能变化研究

The Study of Luminescence Properties of TiO₂/Eu³⁺ under External Force

摘要: 研究了外力条件下TiO₂/Eu³⁺的光致发光光谱的变化行为。外力作用下Eu离子跃迁光谱出现红移现象。外力对晶格压缩的同时，Eu离子能级受到调节，说明外力对晶格能带以及掺杂离子能级存在调制作用。14~16 GPa压力区间，TiO₂/Eu³⁺基质晶格发生由金红石结构到斜锆石结构的相转变，Eu离子光致发光光谱出现明显变化，各跃迁光谱发光峰强度变弱，部分发光峰难以分辨。相变前后，TiO₂基质晶格结构的改变导致其晶格内部晶体场发生截然不同的改变，影响了Eu离子的光致发光行为。

Abstract: The variation behavior of photoluminescence spectra of TiO₂/Eu³⁺ under external force conditions was studied. Under external forces, a redshift phenomenon occurs for Eu ion transition. While external forces compress the lattice, the energy levels of Eu ions are regulated, indicating that external forces have a modulation effect on the energy bands of the lattice and the energy levels of doped ions. In the pressure range of 14~16 GPa, the TiO₂/Eu³⁺ matrix lattice undergoes a phase transition from a rutile structure to a baddeleyite structure, and the Eu ion photoluminescence spectrum shows significant changes. The intensity of each transition spectrum’s emission peak weakens, and some emission peaks are difficult to distinguish. Before and after the phase transition, the change in the lattice structure of TiO₂ matrix leads to a completely different crystal field inside its lattice, affecting the photoluminescence behavior of Eu ions.