中文摘要：

采用共沉淀结合高温分解方法合成了CaO：Eu3＋红色长余辉发光材料．X射线衍射分析表明，随着温度的升高，产物相结构逐渐由碳酸钙的混合相变为单相结构，继而生成单相氧化钙结构．CaO：Eu3＋的激发谱显示为255nm左右的一个宽激发带和393nm的激发峰，宽激发带来源于CaO晶格的电荷迁移（CTB），发射光谱对应于Eu3＋的。D→7FJ（J=0，2，3，4）的跃迁．室温观察到CaO：Eu3＋强的红色长余辉发射，热释光测量证实在CaO：Eu蚪中存在深度大约为0．69eV的陷阱能级，这是CaO：Eu3＋在室温具有红色长余辉的微观原因．存在的陷阱能级可能来源于Eu3＋取代Ca2＋进入晶格后，由于电荷的不等价替换而引入了电子陷阱．余辉衰减曲线的研究表明，样品的余辉发光可能与陷阱及发光中心之间的量子隧穿有关．

英文摘要：

The red long-persistent phosphor CaO： Eu3＋ is prepared by a co-precipitation method with further thermal decomposition. The X-ray diffraction analysis shows that the crystal structure of calcium carbonate sample transforms into a single-phase structure and then generates a single-phase calcium oxide structure with the increase of sintering temperature. The excitation spectrum of CaO： Eu3＋ shows a broad band around 255 nm, which is attributed to the charge transfer of Eu3＋-O2-, and a sharp peak at 393 nm. The emission spectrum of samples correspond to Eu3＋ transitions between SD and 7FJ （J = 0, 2, 3, 4） electron configurations. The red long afterglow is observed at room temperature. A trap level located at 0.69 eV is found by thermolumihnescence measurement, which arises from the fact that Eu3＋ is substituted for Ca2＋ and enters into the lattice. The afterglow luminescence mechanism of sample was discussed according to quantum tunneling.