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

Flämmich, Michael; Gather, Malte C.; Danz, Norbert; Michaelis, Dirk; Meerholz, Klaus
December 2009
Applied Physics Letters;12/28/2009, Vol. 95 Issue 26, p263306
Academic Journal
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.


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