Evaluation of gas permeation barrier properties using electrical measurements of calcium degradation

Abstract

In this work, we developed a thin calcium degradation method introducing sensitive electrical resistance monitoring. We have demonstrated structural models of the inorganic/organic thin films to evaluate barrier properties against water and oxygen permeation. The time-dependent transmission curve of a multibarrier coated on both sides of the polyethersulfone substrate had a linear slope which was measured as 5.17× 10-3 g m2 day at 20 °C and 60% relative humidity. This system can measure an accurate permeation rate with a high sensitivity in the measurable range of 101 - 10-6 g m2 day. In addition, the test structure devised is applicable to various fabrication techniques for passivation layers with durability and ultralow permeability for flexible organic light emitting diodes. © 2007 American Institute of Physics.