Emission Spectra and Luminescence Life Times of Uranium–Mica Type Compounds

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Abstract
A series of uranium–mica type compounds M(UO2)2(XO4)2·nH2O, where M=Ca, Sr, Ba, Mg, Na2, K2, and (H3O)2; X=P and As, as well as the doped samples of Mg(UO2)2(PO4)2·nH2O : Mn(0.03 mol %) and Zn-(UO2)2(PO4)2·nH2O: Cu(0.1 mol %), have been prepared and measured for emission spectra under the UV(365 nm) excitation and decay times. Some of these samples, e.g., (H3O)2(UO2)2(AsO4)2·nH2O, have been found to give weak shoulders and a separated band, in addition to the six bands so far reported for other uranyl(VI) compounds. Samples containing AsO43− ions in place of PO43− gave emission spectra, where the main bands shifted by approximately 100 cm−1 to lower energy also giving shorter life times. The decay times of the six emission bands of Mg(UO2)2(PO4)2·nH2O have been found to have the same value of 2.5×10−4 s.