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Luminescence measurements of chromate ions (CrO 4 2Ϫ ) adsorbed onto disperse silica (SiO 2 ) surfaces under intense pulsed ultraviolet excitation ͑ exc ϭ354.7 or 266 nm, p ϭ20 ns͒ were performed at room temperature. The luminescence spectra were collected for different values of the excitation intensity ͑I͒. The luminescence yield in the red band corresponding to emission from CrO 4 2Ϫ ions varies linearly with I under 354.7 nm excitation. However, the intensity dependence of the luminescencedoi:10.1063/1.119796 fatcat:fqvvdmeps5dobknnfgptllfify