Light-emitting device and display apparatus including the light-emitting device

Patent metadata

Field	Value
Publication number	US-11522164-B2
Application number	US-202117141799-A
Country	US
Kind code	B2
Filing date	Jan 5, 2021
Priority date	Jan 28, 2019
Publication date	Dec 6, 2022
Grant date	Dec 6, 2022

Abstract

A light-emitting device includes a metal reflection layer having a phase modulation surface, a color conversion layer provided on the phase modulation surface of the metal reflection layer, a first electrode provided on the color conversion layer, a hole injection and transport layer provided on the first electrode, a blue organic light-emitting layer provided on the hole injection and transport layer, an electron injection and transport layer provided on the blue organic light-emitting layer, and a second electrode provided on the electron injection and transport layer. The phase modulation surface of the metal reflection layer generates magnetic resonance with respect to incident light. The color conversion layer includes a photoluminescent material.

First claim

What is claimed is:

1. A light-emitting device comprising:
a first metal reflection layer comprising a surface comprising nano patterns arranged periodically;
a color conversion layer provided on the surface of the first metal reflection layer and comprising a photoluminescent material;
a first electrode provided on the color conversion layer;
a blue organic light-emitting layer provided on the first electrode; and
a second electrode provided on the blue organic light-emitting layer.

2. The light-emitting device of claim 1 , wherein the surface of the first metal reflection layer comprises a first phase modulation surface configured to generate magnetic resonance with respect to light that is incident upon the surface of the first metal reflection layer.

3. The light-emitting device of claim 1 , wherein the first metal reflection layer and the second electrode form a microcavity having a resonant wavelength.

4. The light-emitting device of claim 1 , wherein the color conversion layer comprises a dielectric in which the photoluminescent material is dispersed.

5. The light-emitting device of claim 1 , wherein the photoluminescent material comprises a green photoluminescent material configured to convert blue light into green light or a red photoluminescent material configured to convert blue light into red light.

6. The light-emitting device of claim 1 , wherein the color conversion layer contacts an entirety of the surface of the first metal reflection layer.

7. The light-emitting device of claim 1 , further comprising:
a hole injection and transport layer between the first electrode and the blue organic light-emitting layer; and
an electron injection and transport layer between the blue organic light-emitting layer and the second electrode.

8. The light-emitting device of claim 1 , further comprising:
a transparent planarization layer between the first metal reflection layer and the color conversion layer to cover the surface of the first metal reflection layer.

9. The light-emitting device of claim 1 , wherein the first electrode comprises a transparent electrode, and
wherein the second electrode comprises a transflective electrode that transmits a first part of light that is incident upon the second electrode and reflects a second part of the light that is incident upon the second electrode.

10. The light-emitting device of claim 1 , wherein the first electrode comprises a transparent electrode and the second electrode comprises a reflective electrode, and
wherein the first metal reflection layer is semi-transparent and is configured to transmit a first part of light that is incident upon the first metal reflection layer and to reflect a second part of the light that is incident upon the first metal reflection layer.

11. The light-emitting device of claim 1 , further comprising:
a second metal reflection layer provided on the second electrode and comprising a surface comprising nano patterns arranged periodically; and
a planarization layer provided between the second electrode and the second metal reflection layer to cover the surface of the second metal reflection layer.

12. The light-emitting device of claim 11 , wherein the surface of the second metal reflection layer comprises a second phase modulation surface configured to generate magnetic resonance with respect to light that is incident upon the surface of the second metal reflection layer.

13. The light-emitting device of claim 11 , wherein the first metal reflection layer and the second metal reflection layer form a microcavity having a resonant wavelength.

14. The light-emitting device of claim 11 , wherein the first electrode comprises a first transparent electrode and the second electrode comprises a second transparent electrode,
wherein one of the first metal reflection layer and the second metal reflection layer is reflective with respect to light that is incident upon the one of the first metal reflection layer and the second metal reflection layer, and
wherein the other of the first metal reflection layer and the second metal reflection layer is semi-transparent and configured to transmit a first part of light that is incident upon the other of the first metal reflection layer and the second metal reflection layer and to reflect a second part of the light that is incident upon the other of the first metal reflection layer and the second metal reflection layer.

15. A light-emitting device comprising:
a first metal reflection layer comprising a phase modulation surface, the phase modulation surface being configured to generate magnetic resonance with respect to light that is incident upon the phase modulation surface;
a color conversion layer provided on the phase modulation surface of the first metal reflection layer and comprising a photoluminescent material;
a first electrode provided on the color conversion layer;
a blue organic light-emitting layer provided on the first electrode; and
a second electrode provided on the blue organic light-emitting layer.

16. A display apparatus comprising:
a plurality of pixels configured to emit light rays of different colors,
wherein at least one pixel from among the plurality of pixels comprises:
a first metal reflection layer comprising a surface comprising nano patterns arranged periodically;
a color conversion layer provided on the surface of the first metal reflection layer and comprising a photoluminescent material;
a first electrode provided on the color conversion layer;
a blue organic light-emitting layer provided on the first electrode; and
a second electrode provided on the blue organic light-emitting layer.

17. The display apparatus of claim 16 , wherein the at least one pixel further comprises:
a hole injection and transport layer between the first electrode and the blue organic light-emitting layer; and
an electron injection and transport layer between the blue organic light-emitting layer and the second electrode.

18. The display apparatus of claim 16 , wherein the at least one pixel further comprises a transparent planarization layer between the first metal reflection layer and the color conversion layer to cover the surface of the first metal reflection layer.

19. The display apparatus of claim 16 , wherein the at least one pixel further comprises:
a second metal reflection layer provided on the second electrode and comprising a surface comprising nano patterns arranged periodically; and
a planarization layer provided between the second electrode and the second metal reflection layer to cover the surface of the second metal reflection layer.

20. The display apparatus of claim 16 , wherein the plurality of pixels comprise a blue pixel, a green pixel, and a red pixel,
wherein the green pixel comprises a green photoluminescent material configured to convert blue light into green light, and
wherein the red pixel comprises a red photoluminescent material configured to convert blue light into red light.

Assignees

• Samsung Electronics Co Ltd

Inventors

• Joo Wonjae
• Kyoung Jisoo

Classifications

• H01L27/3211

  Electricity · mapped topic

• H01L51/5092

  Electricity · mapped topic

• H01L51/5265 Primary

  Electricity · mapped topic

• H01L51/5271

  Electricity · mapped topic

• H01L51/502

  Electricity · mapped topic