Measuring and structuring the spatial coherence length of organic light-emitting diodes
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The spatial coherence of organic light-emitting diodes (OLEDs) is an important parameter that has gained little attention to date. Here we present a method for making quantitative measurements of the spatial coherence of OLEDs using a Young’s double-slit experiment. The usefulness of the method is demonstrated by making measurements on a range of OLEDs with different emitters (iridium and europium complexes) and architectures (bottom- and top-emitting) and the fringe visibility is further manipulated by gratings embedded in external diffractive optical elements. Based on the experiments and simulation of the results, we quantitatively determine the spatial coherence lengths of several OLEDs and find them to be a few micrometers. A 60% increase in the spatial coherence length was observed when using a narrow bandwidth emitter and a metal-coated grating.
Xie , G , Chen , M , Mazilu , M , Zhang , S , Bansal , A K , Dholakia , K & Samuel , I D W 2016 , ' Measuring and structuring the spatial coherence length of organic light-emitting diodes ' Laser & Photonics Reviews , vol 10 , no. 1 , pp. 82-90 . DOI: 10.1002/lpor.201500065
Laser & Photonics Reviews
© 2015 The Authors. Laser & Photonics Reviews published by WILEY-VCH Verlag GmbH & Co. KGaA Weinheim. This is an open access article under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/), which permits use, distribution and reproduction in any medium, provided the original work is properly cited.
This work was supported by the Engineering and Physical Science Research Council (EPSRC) grants “Challenging the limits of photonics: structured light” EP/J01771X and “Ultra-parallel visible light communications” EP/K00042X. IDWS and KD also acknowledge Royal Society Wolfson Research Merit awards.
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