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利用溶胶–凝胶结合高温煅烧法制备了绿色长余辉发光材料α-Zn3(PO4)2:Mn2+,Na+。通过X射线衍射对产物的相结构进行分析,通过荧光光谱和热释光谱研究其发光本质,并探究了Na+掺杂量对余辉性质的影响。结果表明:制备的样品的结构与α-Zn3(PO4)2相同。样品发射峰位于548 nm处,为绿色发光材料,归属于Mn2+的4T1g–6A1g跃迁。当Na+掺杂量为4%时,样品的发光性能最佳。样品经过紫外光照射后,在暗室中目测其余辉时间约2 h。热释光谱分析表明,掺杂Na+可以增加晶体中Vo¨氧空位缺陷浓度。Vo¨氧空位缺陷浓度的提高有利于捕获更多的激发态电子,延缓激发态电子跃迁回基态,从而达到延长样品的余辉时间。
The green long afterglow phosphor α-Zn3 (PO4) 2: Mn2 +, Na + was prepared by sol-gel combined with high temperature calcination. The phase structure of the product was analyzed by X-ray diffraction, the luminescent nature of the product was studied by fluorescence and thermolysis spectroscopy, and the effect of Na + doping on the afterglow properties was also investigated. The results show that the prepared sample has the same structure as α-Zn3 (PO4) 2. The emission peak of the sample is located at 548 nm, which is a green luminescent material and belongs to the 4T1g-6A1g transition of Mn2 +. When Na + doping amount is 4%, the luminescence property of the sample is the best. After the sample was irradiated with ultraviolet light, the remaining brightness time was estimated to be about 2 h in darkroom. The results of thermolysis spectroscopy show that doping Na + can increase the concentration of Vo vacancies in the crystal. Vo ¨ oxygen vacancy defects increased concentration is conducive to capture more excited state electrons, delayed excited state electronic transition back to ground state, so as to extend the sample afterglow time.