Abstract MgAl2O4 ceramics doped with rare earth ions (Eu2+ and Ce3+ ions) were fabricated by spark plasma sintering technique. A complex characterization of the crystalline and defect structure of the ceramic by XRD was carried out. Absorption, excitation, photo- and cathodoluminescence spectra were studied. The photoluminescence spectrum shifts to the blue region with a maximum at λem = 475 nm for the MAS:0.1Ce ceramics. The nature of this luminescence can be caused by the radiative transitions in the cerium ion 5d–4f. The emission spectrum of MAS:0.1Eu has a “green” band emission in range of 400–700 nm centered around 500 nm, which can be ascribed to the allowed 4f65d1→4f7 (5d–4f) transition of Eu2+. In the millisecond time range, simultaneously with the emission of the complex host centers, the impurity luminescence bands of the chromium ion are recorded. It was shown that cathodoluminescence spectra in nanosecond time range can be decomposed into several emission bands at 2.72, 3.01, 3.37, 3.63–3.82 eV caused by F-type centers. It was demonstrated that the Eu2+ and Ce3+ ions lead to change the intensity ratio of the luminescence bands. The luminescence decay kinetics of synthesized spinel ceramics in nano- and millisecond time range were investigated in detail.

中文翻译：

---

放电等离子烧结法制备稀土离子掺杂MgAl2O4陶瓷的发光性能

摘要 采用放电等离子烧结技术制备了掺杂稀土离子（Eu2+和Ce3+离子）的MgAl2O4陶瓷。通过XRD对陶瓷的晶体和缺陷结构进行了复杂的表征。研究了吸收、激发、光和阴极发光光谱。对于 MAS:0.1Ce 陶瓷，光致发光光谱移至蓝色区域，最大值为 λem = 475 nm。这种发光的性质可能是由铈离子 5d-4f 中的辐射跃迁引起的。MAS:0.1Eu 的发射光谱具有以 500 nm 为中心的 400-700 nm 范围内的“绿色”带发射，这可以归因于 Eu2+ 允许的 4f65d1→4f7 (5d-4f) 跃迁。在毫秒时间范围内，与复杂宿主中心的发射同时，记录铬离子的杂质发光带。结果表明，纳秒时间范围内的阴极发光光谱可以分解为由 F 型中心引起的 2.72、3.01、3.37、3.63-3.82 eV 的几个发射带。结果表明，Eu2+和Ce3+离子导致发光带强度比发生变化。详细研究了合成尖晶石陶瓷在纳秒和毫秒时间范围内的发光衰减动力学。