Preparation of luminescent nanosized NaEu(MoO4)2 incorporated in amorphous matrix originated from zeolite
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Novel luminescent material has been prepared by the reaction of Eu3+ and molybdate species in the matrix of faujasite (FAU) type zeolite X and successive calcination. Eu3+ exchanged FAU was reacted with MoO3 in the solid-state at 723 K, giving a precursor. By calcining it at 1073 K, different crystalline phases were derived depending on MoO3-loading levels. Scheelite type crystal of NaEu(MoO4)2 was formed at high MoO3-loading levels, whereas europium sodalite was formed at low loading levels. For the former sample, X-ray diffraction analysis and transmission electron microscopy revealed that the nanosized NaEu(MoO4)2 was dispersed homogeneously within amorphous aluminosilicate matrix originated from FAU. The amorphous particles containing NaEu(MoO4)2 maintained the original morphology, which the starting FAU particles possessed. The emission intensity of nanosized NaEu(MoO4)2 in the matrix was one order higher than that of europium sodalite. The emission lifetime of nanosized NaEu(MoO4)2 (0.39 ms) in the matrix was longer than that of bulk NaEu(MoO4)2 (0.35 ms) fabricated by conventional solid-state processes.
KeywordsZeolite MoO3 Scheelite Scanning Transmission Electron Microscope Amorphous Matrix
The authors would like to thank the members of Analytical Laboratory of Tokan Material Technology Co., Ltd. for help with the chemical analysis. This work was supported by a Grant-in-Aid for Scientific Research (No. 12450345) and a Grant-in-Aid for Scientific Research Areas (417) (No. 15033245) from the Ministry of Education, Culture, Sports, Science and Technology (MEXT) of the Japanese Government.