Figure 2.

The emission decay profile of CaAl2O4:(Eu, Nd)/TiO2-xNy composite after irradiation by the mercury lamp used for photocatalytic reactions. The inset shows the decline of the intensity of the emission.

Li et al. Nanoscale Res Lett 2011 6:5   doi:10.1007/s11671-010-9750-7