Synthesis and characterization of core/shell structured nanophosphors CePO4：Tb@LaPO4 by solvothermal method

• Published in: Journal of rare earths Vol. 29; no. 12; pp. 1147 - 1151
• Main Authors: Loc, Dinh Xuan, Chi, Tran Thi Kim, Thu Huong, Tran, Vu, Nguyen, Anh, Tran Kim, Strek, Wieslaw, Minh, Le Quoc
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01.12.2011; Institute of Materials Science, Vietnam Academy of Science and Technology, 18 Hoang Quoc Vie Road, Cau Giay Distr., Hanoi, Vietnam%Institute of Low Temperature andStructure Research, Polish Academy of Sciences(PAN), Wroclaw, Poland%Institute of Materials Science, Vietnam Academy of Science and Technology, 18 Hoang Quoc Vie Road, Cau Giay Distr., Hanoi, Vietnam; University of Engineering and Technology, 144 Xuan Thuy Road, Cau Giay Distr., Hanoi, Vietnam
• Subjects: CePO4; CePO4:Tb; CePO4:Tb@LaPO4; luminescence; rare earths; solvothermal synthesis; 合成; 核/壳结构; 溶剂热法; 磷酸镧; 纳米发光材料; 透射电子显微镜; 铽; luminescence; CePO4:Tb; CePO4:Tb@LaPO4; solvothermal synthesis; rare earths
• ISSN: 1002-0721; 2509-4963
• DOI: 10.1016/S1002-0721(10)60614-X

Core/shell structured CePO4：Tb（Ⅲ）@LaPO4 and CePOa：Tb（Ⅲ） were successfully synthesized in tris（2-ethylhexyl） phosphate （TEHP） and diethylene glycol （DEG） solvents for comparison of the two techniques in open air and closed reaction vessel. Morphology and crystal structure of the core/shell nanophosphors were determined by using X-ray diffraction （XRD） and transmission electron microscopy （TEM）, which showed that nanophosphors had diameter of about 5-10 nm with the monoclinic monazite phase. The nanophosphors obtained by close vessel procedure showed smaller size, more homogeneity and pure crystallite. The luminescent measurements were done upon the different excitation wavelengths in ultraviolet region and at room temperatm＇e to elucidate the influences of the used solvents and the reaction temperatures. It was found that CePO4：Tb@LaPO4 preparedby the close vessel synthesis showed the intensity of green band of the transfer from 5D4 to 7F5 energy level, which was strongly increased, and the luminescent decay time was 3.2 ms, which was longer than that of naked CePO4：Tb phosphor.