Abstract
Solid solutions of EuxGd2-xMo5O18 were prepared by thermal decomposition of rare earth (=R) polyoxomolybdate [R2(H2O)12Mo8O27]ヮH2O, and their structures and spectroscopic properties were characterized. These materials exhibit bright red luminescence due to the 4f-4f transitions of Eu3+ under UV excitation. Vibronic transitions from 5D0 excited state coupling with Mo-O lattice vibrations were observed in the luminescence spectrum. A concentration quenching occurred at x>1.22. The luminescence intensity was c.a. one fourth of the commercially available phosphor Y2O2S:Eu3+.
