Coatings with low permeation of gases and vapors
AssigneeNova Plasma Ltd.
InventorsGrzegorz Czeremuszkin, Mohamed Latreche, Michael Robert Wertheimer
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Abstract
A multilayer structure has barrier properties for gases and vapors, for example oxygen and water vapor; the structure comprises: an organic substrate layer, and a multilayer permeation barrier thereon; the barrier comprises: a) a first inorganic coating contacting a surface of the substrate layer, and b) a first organic coating contacting a surface of the inorganic coating; the structure may be employed in a variety of articles where barrier properties are important especially in electronic articles such as organic light emitting diode devices where superior barrier characteristics over the life of the device are required.
Claims23
An organic light emitting or photovoltaic device in which organic semi-conductors are encased in a barrier envelope, said envelope comprising a multilayer structure comprising:
- i) an organic self-supporting substrate layer having a thickness of 50 μm to 5,000 μm, and
- ii) a multilayer permeation barrier thereon, said barrier comprising:
- a) a first inorganic coating contacting a surface of said substrate layer, said inorganic coating being impermeable to gases, when formed as a continuous coating but exhibiting discontinuity-controlled permeability through inadvertent discontinuities in the inorganic coating, said first inorganic coating having a thickness of 45 nm to 350 nm, and
- b) a first organic coating contacting a surface of said first inorganic coating, said organic coating exhibiting diffusion controlled permeation of water vapor and oxygen.
A process for producing an organic light emitting or photovoltaic device comprising preparing a multilayer permeation barrier structure by:
- i) depositing an inorganic material on an organic self-supporting substrate to form an inorganic coating in contact with a surface of said organic substrate, said substrate having a thickness of 50 μm to 5,000 μm, said formed inorganic coating having a thickness of 45 nm to 350 nm, said formed inorganic coating having inadvertent discontinuities such that said inorganic coating exhibits discontinuity-controlled permeability;
- ii) depositing an organic coating on said inorganic coating, said organic coating exhibiting diffusion controlled permeation of water vapor and oxygen, and
- iii) enveloping an organic semi-conductor for said device in an envelope which comprises said barrier structure.
Dependencies are inferred from the claim text.