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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
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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
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载铜活性炭微球的制备及抗菌性能 总被引:2,自引:0,他引:2
以水热法合成的炭微球为原料,经KOH活化制备了活性炭微球,通过在氯化铜溶液中浸渍使铜吸附在活性炭微球上,得到载铜活性炭微球.采用XRD、SEM、TEM、EDS、XPS和N2吸脱附对载铜前后活性炭微球的结构和形貌进行了表征,并测试了其抗菌活性.研究表明,活性炭微球表面负载的铜是以离子形式存在,并且随着溶液中铜离子浓度的增加,载铜量增大,氨水的加入可明显提高铜的负载量.抗菌结果显示,载铜活性炭微球对大肠杆菌(E.coli)和金黄色葡萄球菌(S.aureus)具有良好的杀灭能力.因此,它作为一种抗菌材料有望在水处理、气体过滤和微生物污染等方面获得应用. 相似文献
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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
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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
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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
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研究了乙二醇在氧化物CeO2、NiO和Co3O4增强Pd/C催化剂上的碱性溶液中电化学氧化活性,结果显示虽然纯Pd/C催化剂对乙二醇的电化学氧化活性非常低以及抗催化剂毒化作用非常弱,其电化学性能远远比不上Pt/C催化剂。但添加氧化物CeO2、NiO和Co3O4后,Pd/C对乙二醇电化学氧化催化活性和抗毒化能力都得到大幅度提高,甚至超过商业催化剂E-TEKPt/C。三种氧化物增强Pd/C催化剂的电化学活性顺序为Pd-Co3O4(质量比为2︰1,以下同)/C>Pd-NiO(4︰1)/C>Pd-CeO2(1.3︰1)/C。 相似文献