High-sensitivity permeation measurements on flexible OLED substrates

Ralph Paetzold; Debora Henseler; Karsten Heuser; Valentina Cesari; Wiebke Sarfert; Georg Wittmann; Albrecht Winnacker

doi:10.1117/12.510027

16 February 2004 High-sensitivity permeation measurements on flexible OLED substrates

Ralph Paetzold, Debora Henseler, Karsten Heuser, Valentina Cesari, Wiebke Sarfert, Georg Wittmann, Albrecht Winnacker

Proceedings Volume 5214, Organic Light-Emitting Materials and Devices VII; (2004) https://doi.org/10.1117/12.510027
Event: Optical Science and Technology, SPIE's 48th Annual Meeting, 2003, San Diego, California, United States

Abstract

We describe a novel method to measure permeation rates for oxidizing agents with very high sensitivity. The technique is based on monitoring the resistance of a degrading Ca sensor in situ, inside a climate chamber. A sensitivity limit below 10^-6 g/m² day is reported for accelerated measurement conditions of 38°C and 90% relative humidity. The benefits of the method are demonstrated for single- and double-sided barrier foils, and the temperature and humidity dependence of the transport through PET is analyzed in detail. The method is also applied to obtain permeation rates for a barrier-coated substrate after as well as during bending. Theoretical simulations are used to evaluate the influence of a defect-dominated transport mechanism on the experimental results and to model the time evolution of the concentration profile in a double-barrier stack. Implications for the development of barrier-enhanced substrates for flexible OLED applications are discussed.

Citation Download Citation

Ralph Paetzold, Debora Henseler, Karsten Heuser, Valentina Cesari, Wiebke Sarfert, Georg Wittmann, and Albrecht Winnacker "High-sensitivity permeation measurements on flexible OLED substrates", Proc. SPIE 5214, Organic Light-Emitting Materials and Devices VII, (16 February 2004); https://doi.org/10.1117/12.510027

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