ABSTRACT
This chapter starts with discussion on the processes related to optical absorption, reflection, and transmission by the host crystal. Next, it focuses on transient luminescent phenomena, that is, time-dependent emission processes such as luminescence afterglow (phosphorescence), thermally stimulated emission (thermal glow), photo (infrared)-stimulated emission, and photoquenching. All of these phenomena are related to a quasistable state in a luminescent center or an electron or hole trap.
