Highly reliable stacked white organic light emitting device

Patent metadata

Field	Value
Publication number	US-10770673-B2
Application number	US-201816200895-A
Country	US
Kind code	B2
Filing date	Nov 27, 2018
Priority date	Nov 28, 2017
Publication date	Sep 8, 2020
Grant date	Sep 8, 2020

Abstract

An organic light emitting device (OLED) is provided that includes a cathode and an anode; a blue emitting layer; and at least two hybrid red/green emitting layers. One of the at least two hybrid red/green emitting layers is a cathode side, red/green emitting layer that is disposed between the cathode and the blue emitting layer. The second of the at least two hybrid red/green emitting layers is an anode side, red/green emitting layer that is disposed between the blue emitting layer and the anode. The OLED emits white light.

First claim

We claim:

1. An organic light emitting device (OLED) comprising:
a cathode and an anode;
a blue emitting layer;
at least two hybrid red/green emitting layers, wherein a first one of the at least two hybrid red/green emitting layers is disposed between the cathode and the blue emitting layer, and the second of the at least two hybrid red/green emitting layers is disposed between the blue emitting layer and the anode, wherein the OLED emits white light; and
an additional one or two hybrid red/green emitting layers disposed between the blue emitting layer and the anode, wherein a red/green charge generating layer separates each of the hybrid red/green emitting layers disposed between the blue emitting layer and the anode.

2. The OLED of claim 1 , wherein the red/green charge generating layer has a cathode side with hole transport functionality, an anode side with electron transport functionality, and charge transport functionality disposed between the hole transport functionality and the electron transport functionality.

3. The OLED of claim 2 , wherein the charge transport functionality includes an electron transport material doped with a metal cation selected from Group I or Group II, or Al 3+ .

4. An interior or exterior lighting system that comprises the white OLED of claim 1 .

5. An organic light emitting device (OLED) comprising:
a cathode and an anode;
a blue emitting layer; and
at least two hybrid red/green emitting layers, wherein a first one of the at least two hybrid red/green emitting layers is disposed between the cathode and the blue emitting layer, and the second of the at least two hybrid red/green emitting layers is disposed between the blue emitting layer and the anode, wherein the OLED emits white light; and
wherein each of the hybrid red/green emitting layers has a cathode side and an anode side, and includes a mixed red/green emitting sublayer and an adjacent green emitting sublayer, wherein the mixed red/green emitting sublayer is proximate to the anode side.

6. The OLED of claim 5 , wherein the at least one of the hybrid red/green emitting layers disposed between the anode and the blue emitting layer includes a red dopant blocking sublayer positioned to the cathode side of the green emitting sublayer.

7. The OLED of claim 5 , wherein the green emitting dopant is the same in the mixed red/green emitting sublayer and the green emitting sublayer.

8. An organic light emitting device (OLED) comprising:
a cathode and an anode;
a blue emitting layer; and
at least two hybrid red/green emitting layers, wherein a first one of the at least two hybrid red/green emitting layers is disposed between the cathode and the blue emitting layer, and the second of the at least two hybrid red/green emitting layers is disposed between the blue emitting layer and the anode, wherein the OLED emits white light;
further comprising a blue-cathode, charge generating layer positioned between the first hybrid red/green emitting layer and the blue emitting layer, and adjacent to and in contact with a cathode side of the blue emitting layer.

9. An organic light emitting device (OLED) comprising:
a cathode and an anode;
a blue emitting layer; and
at least two hybrid red/green emitting layers, wherein a first one of the at least two hybrid red/green emitting layers is disposed between the cathode and the blue emitting layer, and the second of the at least two hybrid red/green emitting layers is disposed between the blue emitting layer and the anode, wherein the OLED emits white light;
wherein the first hybrid red/green emitting layer has the same functional and compositional sublayers as the second hybrid red/green emitting layer.

10. An organic light emitting device (OLED) comprising:
a cathode and an anode;
a blue emitting layer;
at least two hybrid red/green emitting layers, wherein a first one of the at least two hybrid red/green emitting layers is disposed between the cathode and the blue emitting layer, and the second of the at least two hybrid red/green emitting layers is disposed between the blue emitting layer and the anode, wherein the OLED emits white light; and
wherein the OLED has two hybrid red/green emitting layers disposed between the blue emitting layer and the anode, and
wherein the OLED has a color rendering index of 78-85.

11. An organic light emitting device (OLED) comprising:
a cathode and an anode;
a blue emitting layer; and
at least two hybrid red/green emitting layers, wherein a first one of the at least two hybrid red/green emitting layers is disposed between the cathode and the blue emitting layer, and the second of the at least two hybrid red/green emitting layers is disposed between the blue emitting layer and the anode, wherein the OLED emits white light; and
wherein the OLED has three hybrid red/green emitting layers disposed between the blue emitting layer and the anode, and
wherein the OLED has a color rendering index of 84-91.

12. A stacked white-light emitting OLED comprising an anode, a cathode, and disposed between the anode and the cathode are at least two hybrid red/green emitting layers; wherein each hybrid red/green emitting layer has a cathode side and an anode side, and includes a mixed red/green emitting sublayer and an adjacent green emitting sublayer, the mixed red/green emitting sublayer proximate to the anode side.

13. The stacked white OLED of claim 12 , wherein the green emitting dopant is the same in the mixed red/green emitting sublayer and the green emitting sublayer.

14. The stacked white OLED of claim 12 , further comprising a blue emitting layer positioned between the two hybrid red/green emitting layers, the blue emitting layer separated from the two red/green emitting layers by charge generation layers.

15. The stacked white OLED of claim 14 , wherein the hybrid red/green emitting layer proximate to the anode includes a red dopant blocking sublayer positioned to the cathode side of the green emitting sublayer.

16. The stacked white OLED of claim 14 , further comprising a third hybrid red/green emitting layer positioned to the anode-side of the blue emitting layer thereby providing at least two anode side, hybrid red/green emitting layers, the two anode side red green emitting layers separated by a charge-generation layer.

17. The stacked white OLED of claim 14 , wherein the blue emitting layer includes a gradient blue emitter concentration profile or a manager dopant, or a gradient blue emitter concentration profile and a manager dopant.

18. An organic light emitting device (OLED) comprising:
a cathode and an anode;
a blue emitting layer, wherein the blue emitting layer includes a gradient blue emitter concentration profile or a manager dopant, or a gradient blue emitter concentration profile and a manager dopant;
at least three hybrid red/green emitting layers, wherein one of the at least three hybrid red/green emitting layers is disposed between the cathode and the blue emitting layer, and two of the at least three red/green emitting layers are disposed between the blue emitting layer and the anode; and
a red/green charge generating layers that separates the at least two hybrid red/green emitting layers disposed between the blue emitting layer and the anode; wherein the OLED emits white light.

19. The OLED of claim 18 , wherein each of the red/green emitting layers disposed between the blue emitting layer and the anode include a mixed red/green emitting sublayer, and a green emitting sublayer that is adjacent to and positioned on the cathode side of the mixed re

Assignees

• Univ Michigan Regents

Inventors

• Forrest Stephen R
• Coburn Caleb
• Jeong Changyeong

Classifications

• H01L51/5084

  Electricity · mapped topic

• H01L51/5044 Primary

  Electricity · mapped topic

• H01L51/5076

  Electricity · mapped topic

• H01L2251/5346

  Electricity · mapped topic

• H01L51/5068

  Electricity · mapped topic