Novel luminescent material was prepd. 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 cryst. phases were derived depending on MoO3-loading levels. Scheelite type crystal of NaEu(MoO4)2 was formed at high MoO3-loading levels, whereas Eu sodalite was formed at low loading levels. For the former sample, x-ray diffraction anal. and TEM revealed that the nanosized NaEu(MoO4)2 was dispersed homogeneously within amorphous aluminosilicate matrix originated from FAU. The amorphous particles contg. NaEu(MoO4)2 maintained the original morphol., which the starting FAU particles possessed. The emission intensity of nanosized NaEu(MoO4)2 in the matrix was one order higher than that of Eu 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.
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