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Tb^3+掺杂CePO_4核壳微球的水热合成及其发光性能 预览

Hydrothermal Synthesis and Luminescence Properties of CePO4 : Tb Core-shell Microspheres
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摘要 在pH=1无模板条件下水热合成出直径为2~3μm的CePO4:Tb核壳微球结构。其核壳表面由直径为20—30nm、长度为200~300nm的纳米棒组成。产物生长过程实验表明,首先形成球状团聚产物,然后一些颗粒在表面生长,由于奥斯瓦尔德熟化效应产物尺寸变大,最后表面上的部分颗粒消耗内部的核而外延生成一维纳米棒。CePO4:Th核壳微球的荧光性质和荧光寿命测试表明,当Tb^3+摩尔分数为10%时,发射强度达到最大值,Tb3+浓度再增加其荧光发射强度由于浓度淬灭作用而迅速降低。 Tb3+-doped CePO4 core-shell microspheres with diameter of 2-3 μm were hydrothermally synthesized at pH = 1.0 without using any template or surfaetant. It was observed that the shells of these spheres were composed by nanorods with a diameter of about 20-30 nm and lengths up to 200 - 300 nm. The time-dependent experiments were also carried out to investigate their growing process. Initially, aggregated spherical products were formed. Then, some particles grew on its surface. As a result of Ostwald ripening, the size of the product increased. Finally, at the expense of the cores inside the spheres, the surface of the product experienced a change from nanoparticles to nanorods. The luminescent properties and luminescence decay lifetimes of CePO4 : Tb core shell mierospheres were performed, indicating that the strongest emission intensity was reached with 10% molar fraction of Tb3+ ions, which might be ascribed to the concentration quenching effect.
作者 王鹏飞 张贤文 朱永春 钱逸泰 WANG Pengfei, ZHANG Xianwen, ZHU Yongchun, QIAN Yitai (School of Chemistry and Material Science, University of Science and Technology of China, Hefei 230026)
出处 《应用化学》 CAS CSCD 北大核心 2011年第8期 913-917,共5页 Chinese Journal of Applied Chemistry
基金 国家重点基础研究发展计划(973)项目(2005CB623601)
关键词 CePO4∶Tb 核壳微球 水热合成 光致发光 CePO4: Tb, core shell microspheres, hydrothermal synthesis, photolumineseence
作者简介 通讯联系人:钱逸泰,教授;Tel:0551-3600006;Fax:0551-3607402;E—mail:ytqian@ustc.edu.cn;研究方向:无机固体材料的设计合成和性质.
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