排序方式: 共有84条查询结果,搜索用时 12 毫秒
1.
2.
A flower-like Eu2+ and Dy3+ co-doped SrAl2O4 long-lasting phosphorescent (LLP) phosphor was synthesized via the inorganic- salt-based sol-gel method.The crystal structure,morphology and optical properties of the composite were characterized.X-ray diffraction diffu-sion (XRD) data and DSC-TG curves of the phosphor revealed that the SrAl2O4 crystallites have been formed after the precursor was calcined at 900 °C and to be single-phase SrAl2O4 at 1100 °C.The SEM photographs indicated that the sample exhibited ... 相似文献
3.
4.
利用一种简单的溶剂法合成炭微球.采用无水乙醇作为碳源和溶剂,以无水乙醇还原Ni(Ac)_2得到的Ni作为催化剂,最佳反应条件:温度500℃、时间48h.采用X-射线衍射仪(XRD)、透射电子显微镜(TEM)、扫描电子显微镜(SEM)以及Raman光谱对样品的成分、晶体结构和形貌进行了分析.结果表明:产品为圆球形和纺锤形两种形貌的炭微球,圆球形炭微球直径为1μm~2μm,纺锤形炭微球直径为1μm~2μm,长度为3μm~6μm.此法简便易行,炭微球的产率高达95%以上,且具有较规则的形貌和窄的尺寸分布. 相似文献
5.
Synthesis and characterization of Y_2O_2S:Eu~(3+),Mg~(2+),Ti~(4+) nanorods via a solvothermal routine 总被引:1,自引:0,他引:1
Y2O2S:Eu3+,Mg2+,Ti4+ nanorods were prepared by a solvothermal procedure.Rod-like Y(OH)3 was firstly synthesized by hydrothermal method to serve as the precursor.Y2O2S:Eu3+,Mg2+,Ti4+ powders were obtained by calcinating the precursor at CS2 atmosphere.The Y2O2S:Eu3+,Mg2+,Ti4+ phosphor with diameters of 30-50 nm and lengths up to 200-400 nm inherited the rod-like shape from the precursor after calcined at CS2 atmosphere.The Y2O2S:Eu3+,Mg2+,Ti4+ nanorods showed hexagonal pure phase,good dispersion and exhibite... 相似文献
6.
Gd3+,Eu3+在介孔Y2O3中的能量传递 总被引:2,自引:0,他引:2
通过模板法与溶胶-凝胶法相结合,在温和的条件下制备了介孔Y2O3.再采用水热反应法制得Eu3+、Gd3+单掺杂及Eu3+,Gd3+双掺杂的三种介孔Y2O3组装体(介孔Y2O3∶Eu3+,介孔Y2O3∶Gd3+,介孔Y2O3∶Eu3+,Gd3+).利用广角和小角X射线衍射(XRD)、透射电子显微镜(TEM)对介孔Y2O3进行了表征,结果表明,所制备的介孔Y2O3为立方相,具有六方孔道结构,孔径约10nm.对介孔Y2O3和组装体系进行了荧光光谱(PL)分析,发现在550℃热扩散处理后,介孔Y2O3∶Eu3+的发光存在基质对Eu3+的能量传递,Y2O3∶Eu3+,Gd3+体系中Gd3+对Eu3+也有能量传递作用. 相似文献
7.
The nature of the emission center of Eu~(2 ) in KCaF_3:Eu~(2 ) strongly depends on the preparative condi-tions.Experimental results show that there are two different d→f transition emission bands,and the origin ofthese two emission bands,their interrelationship and the effect of doping concentration on them have been dis-cussed.A Eu~(2 )-Eu~(3 ) valency change process has been proposed. 相似文献
8.
9.
利用高温固相法合成了一种长余辉发光材料Gd2O2S:Ti,利用XRD测试了其结构并测试了其在紫外光激发下的发光特性;停止照射,有橙色的余辉,时间接近2h。分析该磷光体的发光和余辉产生细节,认为空穴和电子的复合导致Ti^3+的^2E→^2T2的跃迁是产生发光和余辉的原因;并根据缺陷和空位对Gd2O2S:Ti的余辉机理进行探讨,提出了余辉机理模型。 相似文献
10.
本文详细地研究了BaYF5和KCaF3基质中Eu^2+、Ce^3+浓度对其发光的影响,发现两基质中Eu^2+、Ce^3+的猝灭浓度都较低;提出了Eu^2+、Ce^3+的浓度猝灭机理,计算了猝灭浓度和临界距离,并与实验结果进行了比较。 相似文献