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Proceedings Paper

High-sensitivity permeation measurements on flexible OLED substrates
Author(s): Ralph Paetzold; Debora Henseler; Karsten Heuser; Valentina Cesari; Wiebke Sarfert; Georg Wittmann; Albrecht Winnacker
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Paper 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.

Paper Details

Date Published: 16 February 2004
PDF: 10 pages
Proc. SPIE 5214, Organic Light-Emitting Materials and Devices VII, (16 February 2004); doi: 10.1117/12.510027
Show Author Affiliations
Ralph Paetzold, Friedrich-Alexander-Univ. Erlangen-Nuernberg (Germany)
Debora Henseler, Siemens AG (Germany)
Karsten Heuser, Siemens AG (Germany)
Valentina Cesari, Siemens AG (Germany)
Wiebke Sarfert, Friedrich-Alexander-Univ. Erlangen-Nuernberg (Germany)
Georg Wittmann, Siemens AG (Germany)
Albrecht Winnacker, Friedrich-Alexander-Univ. Erlangen-Nuernberg (Germany)

Published in SPIE Proceedings Vol. 5214:
Organic Light-Emitting Materials and Devices VII
Zakya H. Kafafi; Paul A. Lane, Editor(s)

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