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Synthesis and characterization of core/shell structured nanophosphors CePO_4:Tb@LaPO_4 by solvothermal method 被引量:2
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作者 Dinh Xuan Loc Tran Thi Kim Chi +4 位作者 Tran Thu Huong nguyen vu Tran Kim Anh Wieslaw Strek Le Quoc Minh 《Journal of Rare Earths》 SCIE EI CAS CSCD 2011年第12期1147-1151,共5页
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 o... 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. 展开更多
关键词 solvothermal synthesis LUMINESCENCE CePOn:Tb CePOa:Tb@LaPO4 rare earths
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Zirconium metal organic framework for design of tetragonal rare earth-doped zirconia nanoparticles
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作者 Lam Thi Kieu Giang Lukasz Marciniak +5 位作者 Krzysztof Kamil Zur Dinh Manh Tien nguyen vu nguyen Thanh Binh Tran Kim Anh Le Quoc Minh 《Journal of Rare Earths》 SCIE EI CAS CSCD 2019年第11期1230-1236,共7页
Zirconium metal-organic frameworks ZrOBDC(where BDC=C6H4(COOH)2,terephthalic acid)doped and co-doped with rare earth ions Ln(ZrOBDC:Ln^3+,where Ln^3+=Eu3+and Tb^3+as well as Er^3+and Yb^3+)were used as precursors for ... Zirconium metal-organic frameworks ZrOBDC(where BDC=C6H4(COOH)2,terephthalic acid)doped and co-doped with rare earth ions Ln(ZrOBDC:Ln^3+,where Ln^3+=Eu3+and Tb^3+as well as Er^3+and Yb^3+)were used as precursors for the design of tetragonal rare earth doped zirconia nanoparticles(t-ZrO2:Ln^3+NPs)through annealing process.Preparation,characterization and luminescence properties of ZrOBDC:Ln^3+and ZrO2:Ln^3+NPs were investigated.The as-obtained t-ZrO2:Ln^3+NPs have high purity with an average size of 20-30 nm.The luminescence spectra of ZrOBDC:Tb^3+and ZrOBDC:Eu3+display strong green and red emission at around 544 and 611 nm which correspond to 5D4→7F5 and 5D0→7F2 transitions of Tb^3+and Eu3+ions,respectively.The green and red up-conversion emissions of ZrO2:Er^3+,Yb^3+NPs due to 2H11/2,4S3/2→4I15/2 and 4F9/2→4I15/2 transitions of the Er^3+ions are observed under 976 nm laser excitation. 展开更多
关键词 ZIRCONIUM RARE earth ZrOBDC ZrOBDC:Ln3+ ZrO2:Ln3+ UP-CONVERSION
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