排序方式: 共有33条查询结果,搜索用时 93 毫秒
31.
Eu3+在La2O2S中的长余辉发光 总被引:4,自引:0,他引:4
The new Eu3+ doped lanthanum oxysulfide phosphors,which have the orange-red long afterg low emission,were synthesized by solid-state reaction method.The synthesized phosphors were characterized by X-ray diffraction.The excitation and emission spectra,afterglow spectra and afterglow decay curves were examined.XRD confirmed the phosphor as pure phase La2O2S.The phosphors showed typical transitions 5DJ(J=0,1) → 7JJ(J=0,1,2,3,4)of Eu3+.The photoluminescence spectra and afterglow spectra presented the regular alteration with various Eu3+ concentration, due to cross relaxation between energy levels of Eu3+. In addition, we studied the effects of activator concentration and dopants species on the afterglow property. The data showed afterglow result was the best with 2 % Eu3+ and doped with Mg2+ and Zr4+. A prominent phosphorescence can be seen in this phosphor after illuminated with UV light. 相似文献
32.
溶剂热合成纳米球状La2O2S:Eu3+荧光粉 总被引:5,自引:0,他引:5
Eu3+离子激活的硫氧化物荧光粉是目前国内外广泛使用的CRT红色发光材料[1]. 它具有色纯度高、色彩不失真、亮度-电流饱和度特性好和稳定性高等特性, 已成为CRT不可替代的红色荧光粉. 此外, 掺杂或不掺杂Eu3+的硫氧化镧是还原SO2有害气体为S单质的优良催化剂[2,3]. 近年来兴起的纳米材料是有可能在本世纪得到广泛应用的材料; 掺杂稀土离子的硫氧化物有望应用于各种显示技术及催化剂中. 最近, 吴长峰等[4]在Y2O3∶Eu3+纳米管中观察到发射峰展宽等特性. 因而, 研究Eu3+离子激活的硫氧化镧纳米荧光粉是很有意义的. 相似文献
33.
使用激光分子束外延在SrTiO3(001)衬底上生长SrRuO3薄膜,并研究激光能量密度、生长温度和靶材表面烧蚀度等生长参数对于SrRuO3表面形貌、基本磁电性质以及拓扑霍尔效应的影响.当在最优条件下生长SrRuO3薄膜时,样品表面平整、台阶清晰,具有最低的金属-绝缘体转变温度,电阻率最低,且具有最显著的拓扑霍尔效应;而改变生长参数生长的SrRuO3薄膜由于存在更多的缺陷,其表面较粗糙,金属-绝缘体转变温度增大,或表现出绝缘体行为,而拓扑霍尔效应会变弱甚至消失. 相似文献