Mixed metal and organic electrode for organic device

• US 7,511,421 B2
• Filed: 08/17/2004
• Issued: 03/31/2009
• Est. Priority Date: 08/25/2003
• Status: Expired due to Fees

• Current Assignee: Semiconductor Energy Laboratory Co., Ltd.
• Original Assignee: Semiconductor Energy Laboratory Co., Ltd.
• Inventors: Kumaki, Daisuke, Tsutsui, Tetsuo
• Primary Examiner(s): Patel; Nimeshkumar D.
• Assistant Examiner(s): Hines; Anne M
• Application Number:
  US10/919,333
• Publication Number:
  US 20050134173A1
• Time in Patent Office: 1,687 Days
• Field of Search: 313498-512, 428/690
• US Class Current: 313/506
• CPC Class Codes: H10K 10/462 Insulated gate field-effect transistors [IGFETs]
• CPC Class Codes: H10K 50/19 Tandem OLEDs
• CPC Class Codes: H10K 50/805 Electrodes
• CPC Class Codes: H10K 59/805 Electrodes
• CPC Class Codes: H10K 71/60 Forming conductive regions or layers, e.g. electrodes

Abstract

To provide an electrode for an organic device which can be widely applied to organic devices by having both hole injection function and electron injection function. A carrier injection electrode layer 110 in which a metal for electron injection 112 (a metal having a work function of 4.2 eV or less) and a metal for hole injection 113 (a metal having a work function of more than 4.2 eV) are mixed with one kind of organic compound 111 is provided between a first organic layer 100a and a second organic layer 100b. Thus, carriers are injected into a carrier injection electrode layer 110 in the direction according to voltage application, and seemingly, current flows between an organic layer 100 and a metal electrode 101, or between the first organic layer 100a and the second organic layer 100b.

Claims

1. An organic device comprising:

a first organic light emitting layer;

an electrode on the first organic light emitting layer; and

a second organic light emitting layer on the electrode;

wherein the electrode comprises a metal having a work function of 4.2 eV or less, a metal having a work function of more than 4.2 eV, and an organic compound.

2. The organic device according to claim 1,

wherein the organic compound comprises a π

-conjugated organic compound.

3. The organic device according to claim 2,

wherein the organic compound comprises a bipolar organic compound.

4. An electronic device comprising the organic device according to claim 1, wherein the electronic device is one selected from the group consisting of a cellular phone, a personal computer, a monitor, a video camera, a digital camera, a goggle type display, a navigation system, audio components, a car audio system, game machine, a mobile computer, a portable game machine, an electronic book, and an image reproducing device equipped with a recording medium.

5. An organic device comprising an electrode provided between a first organic layer and a second organic layer,

wherein the electrode comprises a first region in which a metal having a work function of 4.2 eV or less is mixed with an organic compound and a second region in which a metal having a work function of more than 4.2 eV is mixed with the organic compound;

and

wherein the first region and the second region are respectively in contact with the first organic layer and the second organic layer.

6. The organic device according to claim 5, wherein the organic compound comprises a π

-conjugated organic compound.

7. An electronic device comprising the organic device according to claim 5, wherein the electronic device is one selected from the group consisting of a cellular phone, a personal computer, a monitor, a video camera, a digital camera, a goggle type display, a navigation system, audio components, a car audio system, game machine, a mobile computer, a portable game machine, an electronic book, and an image reproducing device equipped with a recording medium.

8. An organic device comprising an electrode provided between a first organic layer and a second organic layer,

wherein the electrode comprises an electron injection electrode layer in which a metal having a work function of 4.2 eV or less is mixed with a first organic compound and a hole injection electrode layer in which a metal having a work function of more than 4.2 eV is mixed with a second organic compound which is different from the first organic compound,

wherein the electron injection electrode layer and the hole injection electrode layer are respectively in contact with the first organic layer and the second organic layer.

9. The organic device according to claim 8,

wherein the first organic compound of the electron injection electrode layer comprises an organic compound with high electron injection properties and the second organic compound of the hole injection electrode layer comprises an organic compound with high hole injection properties.

10. An electronic device comprising the organic device according to claim 8, wherein the electronic device is one selected from the group consisting of a cellular phone, a personal computer, a monitor, a video camera, a digital camera, a goggle type display, a navigation system, audio components, a car audio system, game machine, a mobile computer, a portable game machine, an electronic book, and an image reproducing device equipped with a recording medium.