【摘要】 以反滴定共沉淀方法制备了Sc2O3:Nd、Sc2O3:Yb纳米粉体,用热重、差热分析、X射线衍射对前驱体相变及粉体结构进行了研究,并研究了其光致发光。Sc2O3:Nd、Sc2O3:Yb前躯体的热重和差热曲线分别在73℃、77℃与434℃、436℃出现了明显的热失重和吸热峰,结合XRD表明约在450℃,前驱体粉体经γ-ScOOH相转变为立方Sc2O3相。Reitveld方法精修给出Sc、O的原子坐标。结果表明,掺杂离子导致了晶格畸变。在825nm光激发下,粉体Sc2O3:Nd的1084nm主荧光峰为Nd3+的4F3/2→4I11/2跃迁;在937nm光激发下,粉体Sc2O3:Yb的1044nm主荧光峰为Yb3+的2F5/2→2F7/2跃迁。Sc2O3:Nd、Sc2O3:Yb的发光光谱表明激活离子处于较强晶场中,Stark能级分裂大,有利于降低Yb3+的激光阈值、提高激光热稳定性。更多还原

【Abstract】 Nanocrystalline Sc2O3:Nd and Sc2O3:Yb powders were prepared by reverse-striking co-precipitation method. The phase transition and the structure of the precipitant precursor were analyzed by TG-DTA and the X-ray diffraction. Meanwhile, the photoluminescence of Sc2O3:Nd and Sc2O3:Yb powders were also studied. The results of TG-DTA show that obvious weight loss and endothermic peaks appear at 73 ℃, 434 ℃ for Sc2O3:Yb and 77 ℃, 436 ℃ for Sc2O3:Nd, respectively. According to the X-ray diffraction, it can be deduced that the precursor transforms from γ-ScOOH phase into cubic Sc2O3 phase at about 450 ℃. The atom coordinates of Sc and O are obtained by Rietveld refinement method. The doped ions lead to the distortion of lattice .The photoluminescence peak of the Sc2O3:Nd under 825 nm excitation locates at 1084 nm, which is from 4F3/2→4I11/2 transition of Nd3+, and the strongest emission peak of the Sc2O3:Yb under 937 nm excitation is at 1044 nm, which is attributed to 2F5/2→2F7/2 transition of Yb3+. The emission spectra indicate that active ions are located in a relatively strong crystal field, which leads to a large splitting of the active ions energy levels. It is beneficial to decrease the laser threshold of Yb3+ and improve the thermal stability of laser.更多还原