[1] CNRS, UMR 5620, Lab Physicochim Mat Luminescents, F-69622 Villeurbanne, France
[2] Univ Lyon 1, F-69622 Villeurbanne, France
[3] Inst Phys & Chem Engn, Tianjin 300180, Peoples R China
[4] Moscow State Univ, Dept Phys, Synchrotron Radiat Lab, Moscow 119899, Russia
[5] Daresbury Lab, Warrington WA4 4AD, Cheshire, England
[6] Inst Chim Mat Condensee, F-33608 Pessac, France
[7] Delft Univ Technol, Interfac Reactor Inst, NL-2629 JB Delft, Netherlands