Prism coupling method to evaluate the light extraction efficiency of outcoupling substrates |
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| Affiliation: | 1. GE Global Research, 1 Research Circle, Niskayuna, NY 12309, USA;2. Kintech Lab, Kurchatov sq. 1, Moscow 123182, Russia;1. Center of Super-Diamond and Advanced Films (COSDAF), Department of Physics and Materials Science, City University of Hong Kong, Hong Kong Special Administrative Region;2. City University of Hong Kong Shenzhen Research Institute, Shenzhen, PR China;1. Key Laboratory of Petroleum Resources, Gansu Province Key Laboratory of Petroleum Resources Research, Institute of Geology and Geophysics, Chinese Academy of Sciences, Lanzhou 730000, China;2. Institute of Geomechanics, Key Lab of Shale Oil and Gas Geological Survey, Chinese Academy of Geological Sciences, Beijing 100081, China;3. Institute of Exploration and Development, Turpan-Hami Oilfield, PetroChina, Hami, Xinjiang 839009, China;1. Institute of Chemical Research of Catalonia (ICIQ), Avda. Països Catalans 16, E-43007 Tarragona, Spain;2. Molecular Engineering Laboratory, Department of Physics, University of Patras, Patras 26500 GR, Greece;3. R & D Center for Engineering and Science, JEC Group of Colleges, Jaipur Engineering College, Kukas, Jaipur 303101, India;4. Catalan Institution for Research and Advance Studies (ICREA), Avda. Lluis Companys 23, E-08010 Barcelona, Spain;1. Université de Pau et des Pays de l’Adour, IPREM (ECP, CNRS-UMR 5254), 2 Avenue Président Angot, 64053 Pau Cedex 09, France;2. Université de Pau et des Pays de l’Adour, IPREM (EPCP, CNRS-UMR 5254), 2 Avenue Président Angot, 64053 Pau Cedex 09, France;3. Université de Pau et des Pays de l’Adour, IPRA (CNRS-UMR 5142), Avenue de l’Université, BP 1155, 64013 Pau Cedex, France;4. CNRS, Institut de Chimie de Clermont – Ferrand (EP, ICCF, CNRS-UMR 6296), BP 80026, 63171 Aubière, France;5. CNRS, IPREM (EPCP, CNRS-UMR 5254), Hélioparc, 2 Avenue Président Angot, 64053 Pau Cedex 09, France;1. Institute for Clean Energy and Advanced Materials, Faculty of Materials and Energy, Southwest University, Chongqing 400715, PR China;2. Chongqing Key Laboratory for Advanced Materials and Technologies of Clean Energy, Chongqing 400715, PR China;3. School of Physics and Mechanical & Electrical Engineering, Zunyi Normal College, Zunyi 563002, PR China;4. Electron Science Research Institute, Edith Cowan University, 270 Joondalup Drive, Joondalup, WA 6027, Australia |
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| Abstract: | One of the key challenges in organic light-emitting diodes (OLEDs) for lighting applications is efficient light extraction from the planar, multi-layered OLED stack. Several different light extraction approaches are being explored currently by researchers, however characterizing light extraction films after fabricating OLEDs is not a viable approach when the outcoupling films have large surface roughness and is time consuming as well. Here we apply prism coupling method (PCM), a simple and elegant tool, to characterize outcoupling films. We show the effectiveness of PCM in estimating light extraction efficiency of outcoupling films. PCM can expedite selection and optimization of various light extraction approaches without the need to build OLEDs. The experimental results are corroborated by the optical simulations done using ray tracing method taking into account Mie scattering from wavelength sized spherical inclusions in an outcoupling film. |
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| Keywords: | Organic light-emitting diodes (OLEDs) Prism coupling method Light extraction Ray tracing Mie scattering |
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