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Measuring the profile of the emission zone in polymeric organic light-emitting diodes

: Gather, M.C.; Flämmich, M.; Danz, N.; Michaelis, D.; Meerholz, K.


Applied Physics Letters 94 (2009), No.26, Art. 263301, 3 pp.
ISSN: 0003-6951
ISSN: 1077-3118
Journal Article
Fraunhofer IOF ()
electroluminescence; organic light emitting diode; polymer blend

The profile of the emission zone (PEZ) in the emissive layer (EML) of polymeric organic light-emitting diodes (OLEDs) is determined by fitting the measured electroluminescence spectrum of the device with a series of simulated spectra that correspond to different emitter locations. The studied OLEDs are based on two different blue-emitting conjugated polymers. In one case, the PEZ is confined to a 10 nm thin sheet at the anode indicating electron dominated current in the EML. In OLEDs based on the other emitter, the PEZ spreads over the entire EML.