Permeation rate measurements by electrical analysis of calcium corrosion

被引:208
作者
Paetzold, R
Winnacker, A
Henseler, D
Cesari, V
Heuser, K
机构
[1] Univ Erlangen Nurnberg, Dept Mat Sci, D-91058 Erlangen, Germany
[2] Siemens AG, D-91052 Erlangen, Germany
关键词
D O I
10.1063/1.1626015
中图分类号
TH7 [仪器、仪表];
学科分类号
0804 ; 080401 ; 081102 ;
摘要
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.
引用
收藏
页码:5147 / 5150
页数:4
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