ac excitation of organic light emitting devices utilizing conductive charge generation layers

Brückner, Jan; Christ, Nico; Bauder, Olga; Gärtner, Christian; Seyfried, Moritz; Glöckler, Felix; Lemmer, Uli; Gerken, Martina
January 2010
Applied Physics Letters;1/25/2010, Vol. 96 Issue 4, p041107
Academic Journal
The ac-field-induced charge carrier generation and recombination is studied in an asymmetric conjugated polymer light emitting device based on one injecting electrode and one electrode separated by an insulating layer. Under operation with 130 kHz light intensity emitted by the device exhibits a pronounced asymmetry with respect to the polarity of the electric field. Numerical simulations show that this behavior can be explained by the significantly different mobilities of electrons and holes in the conjugated polymer. This approach enables insight into the device physics of organic light emitting devices with internal charge generation and allows direct investigation of hole and electron mobilities in one single device.


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