Encapsulation of organic light emitting devices using siloxane or siloxane derivatives

• US 5,734,225 A
• Filed: 11/14/1996
• Issued: 03/31/1998
• Est. Priority Date: 07/10/1996
• Status: Expired due to Term

• Current Assignee: InnoLux Corporation
• Original Assignee: International Business Machines Corporation
• Inventors: Biebuyck, Hans, Haskal, Eliav
• Primary Examiner(s): O'Shea, Sandra L.
• Assistant Examiner(s): Patel, Vip
• Application Number:
  US08/749,101
• Time in Patent Office: 502 Days
• Field of Search: 313/505, 313/506, 313/509, 313/511, 313/512
• US Class Current: 313/512
• CPC Class Codes: H10K 50/805 Electrodes
• CPC Class Codes: H10K 50/844 Encapsulations

Abstract

An organic light emitting device (10) is provided which is encapsulated by a Siloxane buffer layer (17.1). This Siloxane buffer layer (17.1) is applied to the diode (10) providing for protection against contamination, degradation, oxidation and the like. The Siloxane buffer layer (17.1) carries at least a second encapsulation layer (17.2).

Claims

1. Organic light emitting device partially or completely encapsulated by a transparent or semi-transparent stack of encapsulation layers which at least comprises

a buffer layer comprising Siloxane situated on and forming a conformal contact with said organic light emitting device, and

a second layer attached to said buffer layer and being arranged such that

it adheres to said buffer layer, and

is separated from said organic light emitting device by said buffer layer.

2. The organic light emitting device of claim 1, wherein said buffer layer is either a Siloxane film applied to said organic light emitting device, or a Siloxane layer cured on said organic light emitting device.

3. The organic light emitting device of claim 1, comprising an organic multilayer structure.

4. The organic light emitting device of claim 1, wherein said buffer layer covers a contact electrode of said organic light emitting device.

5. The organic light emitting device of claim 1, wherein said buffer layer covers said organic light emitting device such that a contact electrode remains accessible.

6. The organic light emitting device of claim 5, wherein said second layer comprises a metallization contacting said contact electrode.

7. The organic light emitting device of claim 1, whereby a metallization pattern is embedded in said stack of encapsulation layers.

8. The organic light emitting device of claim 1 or 7, wherein said organic light emitting device is an array or display.

9. The organic light emitting device of claim 7, wherein said organic light emitting device is an array or display and said metallization pattern is designed such that at least one contact of each light emitting element of said array or display is addressable.

10. The organic light emitting device of claim 1, wherein said stack of encapsulation layers covers at least part of the light emitting portion of said organic light emitting device.

11. The organic light emitting device of claim 1, wherein said stack of encapsulation layers comprises further layers.

12. The organic light emitting device of claim 1, wherein a glass substrate supports said stack of encapsulation layers.

13. The organic light emitting device of claim 1, wherein said second layer is either a Siloxane film applied to said buffer layer, or a Siloxane layer cured on said buffer layer.