Diffusion barrier coatings having graded compositions and devices incorporating the same
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United States of America Patent
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Mar 21, 2006
Grant Date -
Mar 11, 2004
app pub date -
Sep 11, 2002
filing date -
Sep 11, 2002
priority date (Note) -
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Abstract
A composite article comprises a substrate having at least a substrate surface and a graded-composition coating disposed on a substrate surface. The composition of the coating material varies substantially continuously across its thickness. The coating reduces the transmission rates of oxygen, water vapor, and other chemical species through the substrate such that the composite article can be used effectively as a diffusion barrier to protect chemically sensitive devices or materials. An organic light-emitting device incorporates such a composite article to provide an extended life thereto.
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