硅酸锶掺Er3+的高压合成及发光特性

 首次采用高压高温方法合成了Sr₂SiO₄:Er³⁺Bi³⁺和SrSiO₃:Er³⁺Bi³⁺发光材料，研究了合成压力、合成温度对发光特性的影响。与常压合成产物相比较，发光谱发生了红移；谱线半宽度显著增大；发光强度和量子发光效率下降。X射线衍射分析得出，SrSiO₃:Er³⁺Bi³⁺发生了结构相变，Sr₂SiO₄:Er³⁺Bi³⁺结构未变但晶格参数发生了变化，且主衍射峰强度发生了反转。分析表明，发光特性的变化是压致晶场、库仑及自旋-轨道相互作用的变化引起的。

High-Pressure Synthesis and Luminescence Characters of Er3+-Activated Strontium Silicate

Sr₂SiO₄:Er³⁺Bi³⁺, SrSiO₃:Er³⁺Bi³⁺ were synthesized by a high-pressure method for the first time. The effect of synthesizing pressure and temperatures on luminescence properties and structures of the samples was studied. The samples synthesized by both high-pressure and atmosphere method were analyzed with SEM. Compared with those synthesized under atmosphere, the red shift of emission peak for the sample obtained by high pressure occurred, the half-widths increased obviously and the intensity and quantum luminescence efficiency decreased. The structural transition of SrSiO₃:Er³⁺Bi³⁺ occurred, while the changing of lattice parameters and the intensity reversion of the main diffraction peaks appeared without structural transition for the Sr₂SiO₄:Er³⁺Bi³⁺. It shows that the variation of luminescence characters is resulted from the pressure-induced changing of the crystal field, coulomb and spin-orbit interaction in the ligand.