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In situ measurement of the internal luminescence quantum efficiency in organic light-emitting diodes

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


Applied Physics Letters 95 (2009), Nr.26, Art. 263306, 3 S.
ISSN: 0003-6951
ISSN: 1077-3118
Fraunhofer IOF ()

The internal luminescence quantum efficiency q is one limiting factor for the performance of organic light-emitting diodes. Photoluminescence measurements are frequently used to estimate q but these neglect effects of the local environment of the emissive sites and the electrical excitation mechanism. We present a method for the in situ measurement of q under electrical operation. The current efficiency of several devices with different emitter-cathode distances is quantitatively compared. Precise optical simulation allows determining q without additional assumptions.