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ChlorosilicatecrystalmaterialM4 Si3O8Cl4 (M =Ba ,Sr ,Ca)isasuitablehostlatticeforluminescencematerials .Adivalenteuropiumactivatedstrontiumchlorosilicatephosphorisakindofgoodblue greenemissionphotoluminescencematerialunderUVexcita tion .Itsluminescencepropertiesandcrystalstructurehavebeenintensivelystudied[1~4 ] .Inthechlorosili catehost ,theluminescenceofEu2 consistsofa4f6 5d1- 4f7(8S7/2 )broad bandemission ,whichbe longstoelectric dipoleallowedtransitionandhasthepropertiesoflargeabso… 相似文献
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Nearly monodisperse,regular-shaped and well oil-dispersible tetragonal BaYF5:0.2Yb3+/0.02Er3+ nanocrystals(NCs) were synthesized in water-ethanol-oleic acid-sodium oleate system.The as-obtained NCs exhibited bright upconversion(UC) fluorescence under the 980 nm excitation.Blue(2H9/2-4I15/2),green((2H11/2,4S3/2)-4I15/2) and red(4F9/2-4I15/2) transitions were observed.The results indicated that the relative intensity of green to red increased gradually with increasing power density,which were seldom in the previous work.Therefore,the UC properties and mechanism were studied in detail. 相似文献
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采用水热法合成了电子俘获材料SrS:Eu2+、Sm3+。通过X射线衍射分析、扫描电子显微镜、能谱、光激励发光光谱和荧光衰减,对其微观结构与光谱性能进行了表征。研究表明所制得的SrS:Eu2+、Sm3+电子俘获材料为单相的面心立方结构,粒度均一,且粒径小。采用水热合成法能够有效降低样品中杂质含量,并可有效减缓样品衰减速率。光激励发光光谱(λex=980nm)表明Eu2+和Sm3+能够掺入SrS基质中,与高温固相法制备的材料相比,水热法制备的SrS:Eu2+、Sm3+有更高的发光强度。 相似文献
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