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Environmental barrier material for organic light emitting device and method of making
| Details |
Inventors: Graff, Gordon L.; Gross, Mark E.; Affinito, John D.; Shi, Ming-Kun; Hall, Michael; Mast, Eric;
Assignee: Battelle Memorial Institute (Richland, WA)
Primary Examiner: Patel; Vip
Assistant Examiner: Williams; Joseph
Attorney, Agent or Firm: Killworth, Gottman, Hagan & Schaeff, L.L.P.
An encapsulated organic light emitting device. The device includes a first barrier stack comprising at least one first barrier layer and at least one first polymer layer. There is an organic light emitting layer stack adjacent to the first barrier stack. A second barrier stack is adjacent to the organic light emitting layer stack. The second barrier stack has at least one second barrier layer and at least one second polymer layer. A method of making the encapsulated organic light emitting device is also provided. |
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DETAILED DESCRIPTION These needs are met by the present invention which is an encapsulated organic light emitting device (OLED).
The device includes a first barrier stack comprising at least one first barrier layer and at least one first polymer layer.
There is an organic light emitting layer stack adjacent to the first barrier stack.
A second barrier stack is adjacent to the organic light emitting layer stack.
The second barrier stack has at least one second barrier layer and at least one second polymer layer.
The device optionally includes at least one first intermediate barrier stack located between the substrate and the first barrier stack, and/or at least one second intermediate barrier stack located between the organic light emitting layer stack and either the first or second barrier stacks.
The first and second intermediate barrier stacks include at least one polymer layer and at least one barrier layer.
Preferably, either one or both of the first and second barrier layers of the first and second barrier stacks is substantially transparent.
At least one of the.
first and second barrier layers preferably comprises a material selected from metal oxides, metal nitrides, metal carbides, metal oxynitrides, and combinations thereof.
The metal oxides are preferably selected from silica, alumina, titania, indium oxide, tin oxide, indium tin oxide, and combinations thereof, the metal nitrides are preferably selected from aluminum nitride, silicon nitride, and combinations thereof, the metal carbide is preferably silicon carbide, and the metal oxynitride is preferably silicon oxynitride.
The encapsulated OLED can also include a substrate adjacent to the first barrier stack on a side opposite to the organic light emitting layer stack.
The substrate can be either a flexible substrate or a rigid substrate.
It is preferably a flexible substrate material, which can be polymers, metals, paper, fabric, and combinations thereof.
The rigid substrate is preferably glass, metal, or silicon.
If a rigid substrate is used, it can be removed prior to use if desired
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