Abstract
The stabilization with time of light emission from electroluminescent (EL) structures still requires investigation. Microscope observations of the EL structure show that the brightness is inhomogeneous and that the light emission is localized on many spots of different sizes. We investigated the distribution of the brightness along the active region of the sample and its dependence on time. The localized emission disappears with increasing time, and the brightness of the sample becomes more homogeneous although its intensity is reduced. This degration of the light emission is tentatively explained in terms of copper ion migration. The migration of copper ions affects the properties of the layer close to the positive electrode which appears bright. Some changes in the electrode surface and the precipitation of substantial amounts of copper were observed.
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