Study of voltage decrease in organic light emitting diodes during the initial stage of lifetime
- Authors: Cusumano, P.
- Publication year: 2016
- Type: Articolo in rivista (Articolo in rivista)
- OA Link: http://hdl.handle.net/10447/151915
Abstract
We report the results of lifetime DC testing at constant current of not-encapsulated organic light emitting diodes (OLEDs) based on Tris (8 idroxyquinoline) aluminum (Alq3) as emitting material. In particular, a voltage decrease during the initial stage of the lifetime test is observed. The cause of this behavior is also discussed, mainly linked to initial Joule self-heating of the device, rising its temperature above room temperature until thermal equilibrium is reached at steady state.