期刊
REVIEW OF SCIENTIFIC INSTRUMENTS
卷 74, 期 12, 页码 5147-5150出版社
AMER INST PHYSICS
DOI: 10.1063/1.1626015
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Highly sensitive permeation measurements are crucial for the characterization and development of polymeric substrates for flexible display applications. In particular, organic light-emitting devices require substrates with extremely low permeation rates for water and oxygen. Here we demonstrate a concept for measuring ultralow permeation rates. The amount of oxidative degradation in a thin Ca sensor is monitored by in situ resistance measurements. The benefits of this technique are demonstrated for polyester foils with single- and double-sided barrier coatings. A sensitivity limit is imposed by the quality of the encapsulation. The resulting base line contribution to the water vapor transmission rate of a glass reference is below 10(-6) g/m(2) day at accelerated test conditions. (C) 2003 American Institute of Physics.
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