Pa. Tanner et al., REPORTED BLUE UP-CONVERSION FROM U4-CRYSTALS UNDER GREEN LASER EXCITATION( DOPED INTO CS2ZRCL6 SINGLE), Chemical physics, 215(1), 1997, pp. 125-130
The reported blue upconversion under green argon ion laser excitation
for U4+ doped into Cs2ZrCl6 has been reinvestigated. The emission is r
eassigned to that from the uranyl ion, by reference to the 300 K spect
ra of Cs2ZrCl6:UO22+ and Cs2UO2Cl4, and a detailed interpretation is g
iven, The contamination of samples of Cs2ZrCl6:UO22+ by U4+ does not p
roduce spectral changes of the low temperature uranyl luminescence in
the range 500-600 nm.