Rise and decay time responses of Sr aluminate phosphorescent materials

In this paper we have studied the rise and decay time responses of Eu and Dy doped strontium aluminates prepared by different methods. The spectrum was characterized by 3D excitation emission matrices (EEM). The normalized rise and decay responses of the total power and at two wavelengths on either side of the spectral maximum exhibit individual behavior. We show that the individual switch on and switch off time responses can be approximated by power law and logarithmic dependencies. The relation between spectral and time responses and the sample contents and technology of fabrication is commented.