Diffusion barrier coatings having graded compositions and devices incorporating the same
First Claim
1. A composite article comprising a substrate having at least a substrate surface and a coating disposed on said at least a substrate surface, said coating comprising a coating material, a composition of which varies substantially continuously across a thickness of said coating.
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Accused Products
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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Citations
15 Claims
- 1. A composite article comprising a substrate having at least a substrate surface and a coating disposed on said at least a substrate surface, said coating comprising a coating material, a composition of which varies substantially continuously across a thickness of said coating.
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7. A composite article comprising a substrate having at least a substrate surface and a coating disposed on said at least a substrate surface;
- said coating comprising a coating material, a composition of which varies substantially continuously across a thickness of said coating;
said substrate comprising a polymeric material;
said coating material comprising a material selected from organic, inorganic, ceramic materials, and combinations thereof;
wherein a transmission rate of oxygen through said substrate coated having said coating deposited thereon is less than about 0.1 cm3/(m2day), as measured at 25°
C. and with a gas containing 21 volume-percent oxygen, a transmission rate of water vapor through said substrate coated with said coating is less than about 1 g/(m2day), as measured at 25°
C. and with a gas having 100-percent relative humidity, and said coating is deposited on said substrate by a method selected from the group consisting of plasma-enhanced chemical-vapor deposition, radio-frequency plasma-enhanced chemical-vapor deposition, expanding thermal-plasma chemical-vapor deposition, sputtering, reactive sputtering, electron-cyclotron-resonance plasma-enhanced chemical-vapor deposition, inductively-coupled plasma-enhanced chemical-vapor deposition, and combinations thereof. - View Dependent Claims (12, 13, 14, 15)
- said coating comprising a coating material, a composition of which varies substantially continuously across a thickness of said coating;
Specification