Device reflectivity as a simple rule for predicting the suitability of scattering foils for improved OLED light extraction

Jack W. Levell; Stephan Harkema; Raghu K. Pendyala; Peter A. Rensing; Alessia Senes; Dirk Bollen; Duncan MacKerron; Joanne S. Wilson

doi:10.1117/12.2023021

27 September 2013 Device reflectivity as a simple rule for predicting the suitability of scattering foils for improved OLED light extraction

Jack W. Levell, Stephan Harkema, Raghu K. Pendyala, Peter A. Rensing, Alessia Senes, Dirk Bollen, Duncan MacKerron, Joanne S. Wilson

Author Affiliations +

Proceedings Volume 8829, Organic Light Emitting Materials and Devices XVII; 88291L (2013) https://doi.org/10.1117/12.2023021
Event: SPIE Organic Photonics + Electronics, 2013, San Diego, California, United States

Abstract

A general challenge in Organic Light Emitting Diodes (OLEDs) is to extract the light efficiently from waveguided modes within the device structure. This can be accomplished by applying an additional scattering layer to the substrate which results in outcoupling increases between 0% to <100% in external quantum efficiency. In this work, we aim to address this large variation and show that the reflectivity of the OLED is a simple and useful predictor of the efficiency of substrate scattering techniques without the need for detailed modeling. We show that by optimizing the cathode and anode structure of glass based OLEDs by using silver and an ITO free high conductive Agfa Orgacon™ PEDOT:PSS we are able to increase the external quantum efficiency of OLEDs with the same outcoupling substrates from 2.4% to 5.6%, an increase of 130%. In addition, Holst Centre and partners are developing flexible substrates with integrated light extraction features and roll to roll compatible processing techniques to enable this next step in OLED development both for lighting and display applications. These devices show promise as they are shatterproof substrates and facilitate low cost manufacture.

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Jack W. Levell, Stephan Harkema, Raghu K. Pendyala, Peter A. Rensing, Alessia Senes, Dirk Bollen, Duncan MacKerron, and Joanne S. Wilson "Device reflectivity as a simple rule for predicting the suitability of scattering foils for improved OLED light extraction", Proc. SPIE 8829, Organic Light Emitting Materials and Devices XVII, 88291L (27 September 2013); https://doi.org/10.1117/12.2023021

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