INFLUENCE OF THE ELECTRICAL EXCITATION PULSE-SHAPE ON THE ELECTROOPTICAL RESPONSE IN SRS-CE3+ ELECTROLUMINESCENT DEVISES

The electro-optical properties of SrS:Ce thin film electroluminescent devices prepared by atomic layer epitaxy have been studied by varying the shape of the electric excitation pulse. The different electric and optical responses have been explained by considering two sets of stat es at each interface. The shallower set of states will be populated by the electrons originating from the deeper states when the electric fi eld is turned on. Relaxation of the carriers from the shallower states towards the deeper ones modifies the relative intensity of the differ ent optical responses according to the shape of the excitation pulse. (C) 1998 American Institute of Physics.