White organic light-emitting diode

• US 8,937,333 B2
• Filed: 09/15/2010
• Issued: 01/20/2015
• Est. Priority Date: 03/24/2010
• Status: Active Grant

• Current Assignee: AU Optronics Corporation
• Original Assignee: AU Optronics Corporation
• Inventors: Lin, Chun-Liang, Chen, Chieh-Wei, Lee, Chung-Chun
• Primary Examiner(s): Page, Dale E
• Application Number:
  US12/883,118
• Publication Number:
  US 20110233600A1
• Time in Patent Office: 1,588 Days
• Field of Search: 257/99, 257/102, 257/103, 257/E51.001, 428/690
• US Class Current: 257/99
• CPC Class Codes: H10K 59/32 Stacked devices having two or more layers, each emitting at different wavelengths

Abstract

A white organic light-emitting diode (WOLED) includes a transparent electrode, a blue-complementary light-emitting layer, a translucent electrode, a blue light-emitting layer, and a non-transparent electrode. The blue-complementary light-emitting layer is disposed on the transparent electrode. The transparent electrode and the translucent electrode include a first voltage. The blue light-emitting layer is disposed on the translucent layer. The non-transparent electrode is disposed on the blue light-emitting layer. The translucent electrode and the non-transparent electrode include a second voltage.

Claims

1. A white organic light-emitting diode disposed on a substrate, the white organic light-emitting diode comprising:

a transparent electrode;

a red-green light-emitting layer emitting a red-green light being disposed on the transparent electrode;

a translucent electrode disposed on the red-green light-emitting layer, wherein a first voltage is applied between the translucent electrode and the red-green light-emitting layer;

a blue light-emitting layer emitting a blue light being disposed on the translucent electrode; and

a non-transparent electrode disposed on the blue light-emitting layer, wherein an optical micro-cavity corresponding to a wavelength of blue light emitted by the blue light-emitting layer is formed between the translucent electrode and the non-transparent electrode, the micro-cavity is a semi-closed cavity, and one end of the micro-cavity is completely closed, wherein a second voltage is applied between the translucent electrode and the non-transparent electrode.

2. The white organic light-emitting diode of claim 1, wherein a material of the translucent electrode comprises silver, aluminum, gold, magnesium or combinations thereof.

3. The white organic light-emitting diode of claim 1, wherein a sheet resistance of the translucent electrode is substantially between 0.1 Ω

/square and 10 Ω

/square.

4. The white organic light-emitting diode of claim 1, wherein the first voltage between the transparent electrode and the translucent electrode is different from the second voltage between the non-transparent and the translucent electrode.

5. The white organic light-emitting diode of claim 1, wherein the translucent electrode is grounding and a thickness of the translucent electrode is substantially between 10 nm and 40 nm.

6. The white organic light-emitting diode of claim 1, further comprising a hole injection layer and a hole transmission layer disposed between the transparent electrode and the translucent electrode.

7. The white organic light-emitting diode of claim 1, further comprising a hole blocking layer and an electron injection layer disposed between the transparent electrode and the translucent electrode.

8. The white organic light-emitting diode of claim 1, further comprising a hole injection layer and a hole transmission layer disposed between the non-transparent electrode and the translucent electrode.

9. The white organic light-emitting diode of claim 1, further comprising a hole blocking layer and an electron injection layer disposed between the non-transparent electrode and the translucent electrode.

10. The white organic light-emitting diode of claim 1, wherein the red-green light emitted by the red-green light-emitting layer comprises a maximum intensity light having a wavelength being substantially greater than 490 nm.

11. The white organic light-emitting diode of claim 1, wherein the blue light emitted by the blue light-emitting layer comprises a maximum intensity light having a wavelength being substantially between 400 nm and 480 nm.

12. The white organic light-emitting diode of claim 1, wherein a thickness of the blue light-emitting layer is substantially less than 120 nm.

23. The white organic light-emitting diode of claim 1, wherein the substrate comprises a concave, and the transparent electrode is disposed on the concave of the substrate.

13. A white organic light-emitting diode disposed on a substrate, the white organic light-emitting diode comprising:

a transparent electrode;

a blue-complementary light-emitting layer emitting a blue-complementary light being disposed on the transparent electrode;

a translucent electrode disposed on the blue-complementary light-emitting layer, wherein a first voltage is applied between the translucent electrode and transparent electrode;

a blue light-emitting layer emitting a blue light being disposed on the translucent electrode, wherein the blue-complementary light is complementary to the blue light; and

a non-transparent electrode disposed on the blue light-emitting layer, wherein an optical micro-cavity corresponding to a wavelength of the blue light emitted by the blue light-emitting layer is formed between the translucent electrode and the non-transparent electrode, the micro-cavity is a semi-closed cavity, and one end of the micro-cavity is completely closed, wherein a second voltage is applied between the translucent electrode and the non-transparent electrode.

14. The white organic light-emitting diode of claim 13, wherein a material of the translucent electrode comprises silver, aluminum, gold, magnesium or combinations thereof.

15. The white organic light-emitting diode of claim 13, wherein a sheet resistance of the translucent electrode is substantially between 0.1 Ω

/square and 10 Ω

/square.

16. The white organic light-emitting diode of claim 13, wherein the first voltage between the transparent electrode and the translucent electrode is different from the second voltage between the non-transparent and the translucent electrode.

17. The white organic light-emitting diode of claim 13, wherein the translucent electrode is grounding and a thickness of the translucent electrode is substantially between 10 nm and 40 nm.

18. The white organic light-emitting diode of claim 13, wherein the blue-complementary light emitted by the blue-complementary light-emitting layer comprises a maximum intensity light having a wavelength being substantially greater than 510 nm.

19. The white organic light-emitting diode of claim 13, wherein the blue light emitted by the blue light-emitting layer comprises a maximum intensity light having a wavelength being substantially between 400 nm and 480 nm.

20. The white organic light-emitting diode of claim 13, wherein a thickness of the blue light-emitting layer is substantially less than 120 nm.

21. The white organic light-emitting diode of claim 13, wherein the blue-complementary light-emitting layer is a yellow light-emitting layer.

22. The white organic light-emitting diode of claim 13, wherein the blue-complementary light-emitting layer is a red-green light-emitting layer.

24. The white organic light-emitting diode of claim 13, wherein the substrate comprises a concave, and the transparent electrode is disposed on the concave of the substrate.

25. A white organic light-emitting structure, comprising:

a substrate comprising a concave;

a transparent electrode disposed on the concave of the substrate;

a red-green light-emitting layer disposed on the transparent electrode;

a translucent electrode disposed on the red-green light-emitting layer, wherein a first voltage is applied between the translucent electrode and the red-green light-emitting layer;

a blue light-emitting layer disposed on the translucent electrode; and

a non-transparent electrode disposed on the blue light-emitting layer, wherein an optical micro-cavity corresponding to a wavelength of blue light emitted by the blue light-emitting layer is formed between the translucent electrode and the non-transparent electrode, and the micro-cavity is a semi-closed cavity, and one end of the micro-cavity is completely closed, wherein a second voltage is applied between the translucent electrode and the non-transparent electrode.