Organic light emitting device and display unit

Patent metadata

Field	Value
Publication number	US-9786869-B2
Application number	US-201615244844-A
Country	US
Kind code	B2
Filing date	Aug 23, 2016
Priority date	Jul 31, 2006
Publication date	Oct 10, 2017
Grant date	Oct 10, 2017

Abstract

An organic light emitting device capable of improving the light extraction characteristics while suppressing the driving voltage and improving the luminescent performance, and a display unit using it are provided. The organic light emitting device includes: a lamination structure that includes a cathode, a plurality of layers including a light emitting layer made of an organic material, and an anode including a metal thin film in this order, in which the cathode is reflective and the anode is semi-transparent to light generated in the light emitting layer; and a resonator structure that resonates the light generated in the light emitting layer between the cathode and the anode.

First claim

What is claimed is:

1. A display device comprising:
a glass substrate;
a plurality of transistors including a first transistor, a second transistor, and a third transistor;
a plurality of interconnection wirings including a first interconnection wiring, a second interconnection wiring, and a third interconnection wiring;
a plurality of lower electrodes including a first lower electrode, a second lower electrode, and a third lower electrode;
a plurality of light emitting elements including a first emitting element, a second emitting element, and a third emitting element;
an upper electrode disposed over the lower electrodes;
a first insulating film disposed between the transistors and the interconnection wirings,
a second insulating film disposed between the interconnection wirings and the lower electrodes;
a third insulating film disposed between the second insulating film and the upper electrode;
a protection film disposed on the upper electrode; and
a light reducing element disposed over the upper electrode and configured to reduce light entered from outside,
wherein,
the first lower electrode is electrically connected to the first transistor via the first interconnection wiring,
the second lower electrode is electrically connected to the second transistor via the second interconnection wiring,
in the third lower electrode is electrically connected to the third transistor via the third interconnection wiring,
the first emitting element is configured to emit red light through the upper electrode,
the second emitting element is configured to emit green light through the upper electrode,
the third emitting element is configured to emit blue light through the upper electrode,
the lower electrode is made of a material including silver,
the upper electrode is made of a material including magnesium and silver,
a thickness of each of the lower electrodes is from 30 nm to 2000 nm,
a thickness of the upper electrode is from 5 nm to 20 nm, and
a thickness of the protective film is from 500 nm to 10000 nm.

2. The display device according to claim 1 , wherein a distance between each of the lower electrodes and the upper electrode is set according to a wavelength of light emitted from the light emitting elements.

3. The display device according to claim 2 , wherein each of the lower electrodes and the upper electrode are arranged at the distance to resonate light emitted from the light emitting elements.

4. The display device according to claim 1 , wherein the plurality of light emitting elements include a hole injection layer.

5. The display device according to claim 4 , wherein the upper electrode is in contact with the hole injection layer.

6. The display device according to claim 1 , wherein the plurality of light emitting elements include an electron transport layer and an electron injection layer.

7. The display device according to claim 6 , wherein the electron injection layer is disposed between the electron transport layer and the lower electrodes.

8. The display device according to claim 1 , wherein a ratio of magnesium (Mg):silver (Ag) in the upper electrode is about 10:1.

9. The display device according to claim 1 , wherein the thickness of the upper electrode is from 5 nm to about 10 nm.

10. The display device according to claim 1 , wherein:
the lower electrode functions as a cathode, and
the upper electrode functions as an anode.

11. A display device comprising:
a plastic substrate;
a plurality of transistors including a first transistor, a second transistor, and a third transistor;
a plurality of interconnection wirings including a first interconnection wiring, a second interconnection wiring, and a third interconnection wiring;
a plurality of lower electrodes including a first lower electrode, a second lower electrode, and a third lower electrode;
a plurality of light emitting elements including a first emitting element, a second emitting element, and a third emitting element;
an upper electrode disposed over the lower electrodes;
a first insulating film disposed between the transistors and the interconnection wirings,
a second insulating film disposed between the interconnection wirings and the lower electrodes;
a third insulating film disposed between the second insulating film and the upper electrode;
a protection film disposed on the upper electrode; and
a light reducing element disposed over the upper electrode and configured to reduce light entered from outside,
wherein,
the first lower electrode is electrically connected to the first transistor via the first interconnection wiring,
the second lower electrode is electrically connected to the second transistor via the second interconnection wiring,
the third lower electrode is electrically connected to the third transistor via the third interconnection wiring,
the first emitting element is configured to emit red light through the upper electrode,
in the second emitting element is configured to emit green light through the upper electrode,
the third emitting element is configured to emit blue light through the upper electrode,
the lower electrode is made of a material including silver,
the upper electrode is made of a material including magnesium and silver,
a thickness of each of the lower electrodes is from 30 nm to 2000 nm,
a thickness of the upper electrode is from 5 nm to 20 nm, and
a thickness of the protective film is from 500 nm to 10000 nm.

12. The display device according to claim 11 , wherein a distance between each of the lower electrodes and the upper electrode is set according to a wavelength of light emitted from the light emitting elements.

13. The display device according to claim 12 , wherein each of the lower electrodes and the upper electrode are arranged at the distance to resonate light emitted from the light emitting elements.

14. The display device according to claim 11 , wherein the plurality of light emitting elements include a hole injection layer.

15. The display device according to claim 14 , wherein the upper electrode is in contact with the hole injection layer.

16. The display device according to claim 11 , wherein the plurality of light emitting elements include an electron transport layer and an electron injection layer.

17. The display device according to claim 16 , wherein the electron injection layer is disposed between the electron transport layer and the lower electrodes.

18. The display device according to claim 11 , wherein a ratio of magnesium (Mg):silver (Ag) in the upper electrode is about 10:1.

19. The display device according to claim 11 , wherein the thickness of the upper electrode is from 5 nm to about 10 nm.

20. The display device according to claim 11 , wherein:
the lower electrode functions as a cathode, and
the upper electrode functions as an anode.

Assignees

• Sony Corp

Inventors

• Kashiwabara Mitsuhiro

Classifications

• H01L51/5092

  Electricity · mapped topic

• H01L51/006

  Electricity · mapped topic

• H01L51/0081

  Electricity · mapped topic

• H01L2251/558

  Electricity · mapped topic

• H01L51/5253

  Electricity · mapped topic