01484nas a2200169   4500008004100000022001400041245015700055210006900212260011000281300001200391490000700403520070400410100002401114700002301138700002401161856012901185       2016                        eng d  a1474-905X00aQuenching effect of uranyl species in the photoluminescence emission and visible-light-driven water dissociation activity of CdS and TiO2 photocatalysts0 aQuenching effect of uranyl species in the photoluminescence emis  aTHOMAS GRAHAM HOUSE, SCIENCE PARK, MILTON RD, CAMBRIDGE CB4 0WF, CAMBS, ENGLANDbROYAL SOC CHEMISTRYcAPR  a758-7660 v153 a<p>Anchoring of uranyl species (2-4 mol%) led to the complete quenching of photoluminescence emission and the visible-light-driven water photodissociation activity of TiO2 (Degussa-P25) and a hydrothermally synthesized CdS photocatalyst. Photophysical measurements revealed a fast relaxation and the transfer of photogenerated electrons/energy from the TiO2 or CdS substrate to the acceptor uranyl moieties. Besides the position of flat band levels, significant overlap of the absorption/emission spectra of the host matrix and the surface-bound UO22+ species is responsible for this reverse energy transfer from a wide bandgap semiconductor to a material with a smaller band-to-band energy gap.</p>1 aGupta, Narendra, M.1 aKelkar, Sarika, A.1 aKorake, Prakash, V.  uhttps://library.ncl.res.in/content/quenching-effect-uranyl-species-photoluminescence-emission-and-visible-light-driven-water