排序方式: 共有48条查询结果,搜索用时 31 毫秒
31.
32.
33.
Long lasting strontium aluminate phosphors were synthesized by means of coated precipitation in the experiment. SrA12O4 monoclinic phase with long afterglow was synthesized at 1 100 ℃ with the aid of H3BO3,and the synthetic temperature decreased about 100 ℃-150 ℃ than in solid state reaction. The process of heat treatment was studied by TG-DTA. The phase compositions of powders were analyzed by XRD. The micrographs of the samples were investigated by SEM and the luminescent properties were researched by optical spectrum. The effects of H3 BO3 on the phase composition and microstructure of the calcined powders were investigated. The results indicated that H3BO3 accelerated the formation of SrAl2O4 by consuming the intermediate phase. The addition of Dy2O3 stimulated the afterglow property due to the increase in the depth of the trap center in the materials. 相似文献
34.
张亚楠 《少年文艺(南京)》2008,(6):45-45
夕阳的一缕余辉斜射在墙上,雪白的墙上映出点点淡红,看上去那么恬静,那么美!家中静悄悄的,全家人的心都被爷爷的病情牵扯着,每个人的脸上都笼罩着愁云。突然,我听到爷爷房中有轻微的响声,紧接着是穿鞋下地的声 相似文献
35.
36.
37.
彩色人造夜光石因其能在白天吸光储能,夜晚自发光,在景观装饰和引导指示领域有巨大的应用前景。但是,传统人造夜光石白天色彩单调、老旧,装饰效果局限于夜间。针对该问题,本文通过探究材料组分的透光性对余辉性能的影响,选定合适于人造夜光石的改色剂和材料组分,初步实现彩色人造夜光石的制备。试验结果表明,材料组分透明度的提升与余辉性能提升成正比,色浆与色精的透光率在80%以上,适合作为人造石的着色剂,材料组分透明度介于35%~50%之间,对余辉性能影响最为显著。满足以上组分条件,长余辉材料添加量仅18.34%的红、蓝、黄、绿四种试块,3 h的余辉亮度均满足人眼可见亮度0.32 mcd/㎡,绿色及蓝色试块满足交通标识要求3 h余辉亮度0.052 cd/㎡。 相似文献
38.
周亮 《广东轻工职业技术学院学报》2007,6(3):18-21,34
稀土铝酸盐长余辉发光材料具有广阔的应用前景,已成为人们的研究热点.本文综述了这类材料的发展历史,发光机理及制备方法,并探讨了其发展趋势. 相似文献
39.
40.
以钛酸四丁酯和硝酸钙为原料,用改进的固相反应法成功合成了CaTiO3:Pr红色荧光粉.为了提高这种荧光粉的发光性能,加入铝离子作为电荷补偿剂,硼酸作为助熔剂,以及加入锌离子和镁离子替代一部分钙离子,并对其发光性能的影响进行了研究.采用X射线衍射、荧光分光光度计和扫描电镜研究了CaTiO3:Pr的物相组成,发光性质和颗粒形貌.结果表明一定量的硼酸、铝离子、镁离子、锌离子能够有效的提高CaTiO3:Pr红色荧光粉发光强度.余辉曲线和发光亮度表明当硼酸与硝酸钙的物质的量之比为0.3,铝离子与硝酸钙的物质的量之比为0.001时Ca0.8Zn0.2TiO3:Pr,Ca0.9Mg0.1TiO3:Pr样品具有最佳的发光性能. 相似文献