混合溶剂热合成BaFBr∶Eu^(2+)微纳米晶及其性能表征  

Mixed Solvothermal Synthesis and Characterization of BaFBr∶Eu^(2+) Nano/Micro-Crystals

作　　者：梁庆华[1,2] 史瑶[1] 马望京[1] 杨新民[1] 李智[1] 

机构地区：[1]中国科学院理化技术研究所,北京100190 [2]中国科学院研究生院,北京100049

出　　处：《影像科学与光化学》2012年第1期33-42,共10页Imaging Science and Photochemistry

摘　　要：通过水和乙醇的混合溶剂热方法制备了不同形貌和粒径的BaFBr∶Eu2+微纳米晶.研究了不同反应条件对产物的影响,初步提出了产物的形成机制.用场发射扫描电镜(FE-SEM)、高分辨透射电子显微镜(HRTEM)、X射线粉末衍射(XRD),荧光光谱(PL)对BaFBr∶Eu2+进行了表征.结果表明:反应温度、时间及十六烷基三甲基溴化铵(CTAB)用量对产物物相、形貌及粒径有显著影响;制备的BaFBr∶Eu2+经退火后有优越的发光性能:用280nm光激发,在390nm处有对应于Eu2+4f65d12(t2g)→4f78(S7/2)跃迁的强发射峰,是计算机辐射成像板(Imaging Plate)中X射线存储荧光粉潜在可应用材料,本文为优质高效X射线存储荧光材料的可控制备提供了简洁的路径.Uniform BaFBr ＂ Eu2＋ nano/micro-crystals with different morphology and size were prepared by solvothermal method in the ethanol-water mixed solvents. A possible formation process of the products was proposed on the basis of phase and morphology results under different reaction conditions. The phase structure, morphology and optical properties of the products were characterized by X-ray diffraction （XRD）, field-emission scanning electron microscopy （FESEM）, transmission electron microscopy （TEM）, high-resolution TEM （HRTEM） and photoluminescence （PL）. Preliminary results reveal that the phase, size and morphology of the products strongly depend on the reaction time, temperature and surfactant amounts. Annealing at 300 ℃ under reducing atmosphere and excited at 280 nm UV-light, the BaFBr ＂ Eu2＋ samples show sharp emission at 390 nm due to the transitions of 4f65d1→4f^7 of Eu2＋ , which suggests the as-prepared BaFBr ＂ imaging plates for computed radiography. Eu2＋ is a promising X-ray storage phosphor in

关 键 词：X射线成像 混合溶剂热合成 氟溴化钡 微纳米晶 发光材料 

分 类 号：TB383.1[一般工业技术—材料科学与工程]