Kellerman D G, Kalinkin M O, Abashev R M, Medvedeva N I, Surdo A I, Tyutyunnik A P
Institute of Solid State Chemistry, Ural Branch, Russian Academy of Sciences, 91, Pervomaiskaya St., 620990 Ekaterinburg, Russia.
Phys Chem Chem Phys. 2020 Dec 16;22(47):27632-27644. doi: 10.1039/d0cp05185c.
Olivine-type phosphate LiMgPO4 doped with rare-earth elements is currently considered as a new dosimetric material suitable for both OSL and TSL applications and able to compete with top commercial detectors. In this work, the samples of LiMgPO4:Er3+ were synthesized by the conventional solid state reaction method. We first studied X-ray luminescence and thermally and optically stimulated luminescence in LiMgPO4:Er3+ in detail. Our studies included the structure refinement, DFT calculations, which predicted the preferred positions of both erbium and charge-compensating vacancies, and UV-vis spectroscopy. We showed that the thermoluminescence spectrum of irradiated LiMgPO4:Er3+ does not contain components caused by the 4f-4f transitions in erbium, but coincides with the spectrum of the phosphate matrix with two broad bands at 360 nm and 650 nm. We discovered a high OSL and TSL output in LiMgPO4:Er3+, despite the nonradiative deexcitation of erbium ions.
掺杂稀土元素的橄榄石型磷酸盐LiMgPO₄目前被认为是一种适用于光释光（OSL）和热释光（TSL）应用的新型剂量材料，能够与顶级商业探测器竞争。在这项工作中，采用传统固相反应法合成了LiMgPO₄:Er³⁺样品。我们首先详细研究了LiMgPO₄:Er³⁺中的X射线发光以及热激发和光激发发光。我们的研究包括结构精修、密度泛函理论（DFT）计算（该计算预测了铒和电荷补偿空位的优先位置）以及紫外可见光谱。我们表明，辐照后的LiMgPO₄:Er³⁺的热释光谱不包含由铒的4f - 4f跃迁引起的成分，而是与磷酸盐基质的光谱一致，在360 nm和650 nm处有两个宽带。我们发现LiMgPO₄:Er³⁺具有高的OSL和TSL输出，尽管铒离子存在非辐射去激发。
