基于SrSeO₃基质三价Bi³⁺，Ce³⁺和Eu³⁺离子掺杂的发光晶体化合物的制备、结构与光致发光性能研究

Investigation of the Synthesis, Structure, and Photoluminescent Properties of Trivalent Bi³⁺, Ce³⁺ and Eu³⁺ Ions-Doped SrSeO₃ Phosphors

摘要: 发光晶体化合物在诸如照明与显示、光信息安全、生物医疗等领域已有广泛应用。文章通过高温固相法成功合成了基于SrSeO₃基质Bi³⁺、Eu³⁺和Ce³⁺离子掺杂的发光晶体化合物。通过X射线衍射分析发现样品均属于具有正交晶系结构的SrSeO₃晶体，空间群为Pnma (62)，并且Bi³⁺、Eu³⁺和Ce³⁺倾向于取代[SrO₉]中的Sr²⁺格位。常温光致光谱的测试表明，紫外光可有效激发Bi³⁺、Ce³⁺和Eu³⁺掺杂SrSeO₃样品，分别发射出可归属于³P₁ → ¹S₀ (Bi³⁺)、5d → 4F (Ce³⁺)和⁵D₀ → ⁷F_j (Eu³⁺)的特征发射峰。此外，基于荧光衰减曲线测试的结果，发现SrSeO₃基质与掺杂离子间存在能量传递。据此，构建了机理模型对样品可能存在的发光来源进行了分析。

Abstract: Luminescent crystal compounds have been widely applied in various fields, including but not limited to lighting and display, optical information security, and biomedical purposes. In this work, a series of luminescent crystal compounds that used the SrSeO₃ as the host matrix for trivalent Bi³⁺, Eu³⁺, and Ce³⁺ ions doping were successfully synthesized using the high-temperature solid-state reaction method. The X-ray diffraction results indicated that the as-obtained samples belong to an orthorhombic-phased SrSeO₃ crystal with a space group of Pnma (62), and the Bi³⁺, Eu³⁺, and Ce³⁺ dopants show a preferential substitution for Sr²⁺ sites in the [SrO₉] polyhedra. Room temperature photoluminescent spectra revealed that the Bi³⁺, Ce³⁺, and Eu³⁺ doped SrSeO₃ samples can be effectively excited with ultraviolet light, showing the emission spectra that can be attributed respectively to the characteristic transitions of ³P₁ → ¹S₀ for Bi³⁺, 5d → 4F for Ce³⁺, and ⁵D₀ → ⁷F_j for Eu³⁺. Besides, based on the measured fluorescent decay curves and their fitting results, an energy transfer from the SrSeO₃ host matrix to the Bi³⁺, Eu³⁺, and Ce³⁺ dopants was revealed. Accordingly, a feasible mechanism that can be used to explain the possible luminescent origin was established.