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CN-122003981-A - Display panel, light emitting device and display device

CN122003981ACN 122003981 ACN122003981 ACN 122003981ACN-122003981-A

Abstract

The embodiment of the disclosure provides a display panel, a light emitting device and a display device, relates to the technical field of display, and is used for improving the light emitting efficiency of the light emitting device. The display panel includes a substrate, an isolation structure, and a light emitting device. The isolation structure defines a plurality of pixel openings. The pixel opening is provided with a light emitting device. The light emitting device comprises a first electrode, a light emitting functional layer and a second electrode which are overlapped along the direction far away from the substrate, wherein the first electrode comprises a first sub-layer and a second sub-layer which are overlapped along the direction far away from the substrate, and a first distance is reserved between the surface of the first light emitting layer of the first light emitting device, which is close to the substrate, and the surface of the first electrode of the first light emitting device, which is close to the substrate. The second light emitting layer of the second light emitting device is adjacent to the surface of the substrate with a second distance from the surface of the first electrode of the second light emitting device adjacent to the substrate. The ratio of the first distance to the second distance is 1.0-1.5. The display panel is used for displaying images.

Inventors

  • GAO RONGRONG
  • WANG DAN
  • CHEN LEI
  • LI JUNCONG
  • WU TONG

Assignees

  • 京东方科技集团股份有限公司

Dates

Publication Date
20260508
Application Date
20240902

Claims (20)

  1. A display panel, comprising: A substrate; an isolation structure disposed on the substrate and defining a plurality of pixel openings; A light emitting device provided with the pixel opening, the light emitting device including a first electrode, a light emitting functional layer, and a second electrode stacked in a direction away from the substrate, the first electrode including a first sub-layer and a second sub-layer stacked in a direction away from the substrate, the light emitting functional layer including a first light emitting layer and a second light emitting layer stacked in a direction away from the substrate; the light emitting device comprises a first light emitting device and a second light emitting device, wherein the thickness of a second sub-layer in the first light emitting device is different from that of a second sub-layer in the second light emitting device; The first light-emitting layer of the first light-emitting device is close to the surface of the substrate, a first distance is reserved between the first light-emitting layer of the first light-emitting device and the surface of the first electrode of the first light-emitting device, which is close to the substrate, and a second distance is reserved between the second light-emitting layer of the second light-emitting device, which is close to the surface of the substrate, and the surface of the first electrode of the second light-emitting device, which is close to the substrate, and the ratio of the first distance to the second distance ranges from 1.0 to 1.5.
  2. The display panel according to claim 1, wherein an emission color of the first light-emitting layer is a first color, an emission color of the second light-emitting layer is a second color, and a light wavelength of the first color is larger than a light wavelength of the second color; The light-emitting functional layer further comprises a third light-emitting layer positioned on one side of the first light-emitting layer close to the substrate, wherein the light-emitting color of the third light-emitting layer is a third color, and the wavelength of light rays of the second color is larger than that of light rays of the third color; The light emitting device further comprises a third light emitting device, wherein the thicknesses of the second sub-layer in the first light emitting device, the second sub-layer in the second light emitting device and the second sub-layer in the third light emitting device are different; A third distance is arranged between the surface, close to the substrate, of the third light-emitting layer of the third light-emitting device and the surface, close to the substrate, of the first electrode of the third light-emitting device, and the ratio of the second distance to the third distance is in the range of 0.8-1.2.
  3. The display panel of claim 2, wherein a ratio of the first distance to the third distance ranges from 1.0 to 1.5.
  4. The display panel according to claim 2 or 3, wherein a fourth distance is provided between the surface of the second electrode layer close to the substrate and the surface of the third light emitting layer close to the substrate, a fifth distance is provided between the surface of the second electrode layer close to the substrate and the surface of the first light emitting layer close to the substrate, and a ratio of the fourth distance to the fifth distance is 1.8-2.2.
  5. The display panel of any one of claims 2-4, wherein the second sub-layer of the first electrode comprises a microcavity adjustment layer and a transparent conductive layer, the microcavity adjustment layer is located between the first sub-layer of the first electrode and the transparent conductive layer, and the transparent conductive layer is electrically connected with the first sub-layer; the thicknesses of the microcavity regulating layer in the first light-emitting device, the microcavity regulating layer in the second light-emitting device and the microcavity regulating layer in the third light-emitting device are all different.
  6. The display panel of claim 5, wherein the material of the microcavity conditioning layer comprises a conductive material.
  7. The display panel of claim 5, wherein the material of the microcavity conditioning layer comprises an insulating material, and wherein the transparent conducting layer covers the sides of the microcavity conditioning layer in the same first electrode and is in contact and electrical connection with the edges of the first sublayer.
  8. The display panel of any one of claims 5-7, wherein a thickness of the microcavity adjustment layer of the first light-emitting device is greater than a thickness of the microcavity adjustment layer of the second light-emitting device; The thickness of the microcavity adjustment layer of the third light-emitting device is greater than the thickness of the microcavity adjustment layer of the second light-emitting device.
  9. The display panel of any one of claims 5-8, wherein the microcavity adjustment layer of the first light-emitting device has a thickness in the range of The thickness range of the microcavity regulating layer of the second light-emitting device is as follows The thickness range of the microcavity regulating layer of the third light-emitting device is
  10. The display panel of claim 9, wherein the light emitting functional layer has a thickness in the range of
  11. The display panel according to any one of claims 5 to 10, wherein the transparent conductive layer has a transmittance of 90% or more for light within a predetermined wavelength band, the predetermined wavelength band being in a range of 440nm to 660nm.
  12. The display panel according to claim 11, wherein the transmittance of the second electrode layer for light within the predetermined wavelength band is greater than or equal to 40% and less than or equal to 70%, and/or, The reflectivity of the second electrode layer is greater than or equal to 30% and less than or equal to 60%.
  13. The display panel according to any one of claims 1 to 12, wherein the material of the first light emitting layer comprises a first host material, the material of the second light emitting layer comprises a first exciplex, the first exciplex comprises a second host material and a third host material, and the second host material is a hole type material; wherein the absolute value of the difference between the highest occupied molecular orbital levels of the first host material and the second host material is less than or equal to 0.3eV.
  14. The display panel according to any one of claims 1 to 13, wherein a hole mobility of a material of the first light-emitting layer is greater than a hole mobility of a material of the second light-emitting layer.
  15. The display panel according to any one of claims 1 to 14, wherein a ratio of hole mobility to electron mobility of a material of the second light emitting layer is in a range of 0.01 to 100.
  16. The display panel according to any one of claims 2 to 15, wherein the material of the first light emitting layer comprises a first doping material, the material of the second light emitting layer comprises a second doping material, and the material of the third light emitting layer comprises a third doping material; The peak wavelength range of the photoluminescence spectrum of the first doping material is 600 nm-650 nm, and/or, The peak wavelength range of the photoluminescence spectrum of the second doping material is 500 nm-540 nm, and/or, The peak wavelength range of the photoluminescence spectrum of the third doping material is 440 nm-490 nm.
  17. The display panel according to any one of claims 2 to 16, wherein the material of the first light emitting layer comprises a first doping material, the material of the second light emitting layer comprises a second doping material, and the material of the third light emitting layer comprises a third doping material; The peak wavelength range of the electroluminescent spectrum of the first light emitting device is 600nm to 650nm, and/or, The peak wavelength range of the electroluminescent spectrum of the second light emitting device is 500 nm-540 nm, and/or, And the peak wavelength range of the electroluminescent spectrum of the third light-emitting device is 440 nm-490 nm.
  18. The display panel of any one of claims 1-17, wherein the isolation structure comprises: A pixel defining layer defining a plurality of first sub-openings; A barrier layer laminated with the pixel defining layer and defining a plurality of second sub-openings, each of which is communicated with one of the first sub-openings to form one of the pixel openings; The partition layer comprises a first sub partition layer and a second sub partition layer which are stacked along the direction far away from the substrate, the second sub partition layer comprises an edge part, and the edge part extends towards the direction close to the central line of the adjacent pixel opening compared with the first sub partition layer.
  19. The display panel of claim 18, wherein the barrier layer is located between the pixel defining layer and a first electrode layer; The dimension of the edge part along the second direction ranges from 0.4 mu m to 1 mu m, the second direction is parallel to the substrate, and any position point on the edge part points to the center line of the adjacent pixel opening.
  20. The display panel of claim 18 or 19, wherein the first sub-barrier layer has a thickness in the range of 1-4 μm.

Description

Display panel, light emitting device and display device Technical Field The disclosure relates to the field of display technologies, and in particular, to a display panel, a light emitting device and a display device. Background The OLED (Organic LIGHT EMITTING Diode) display panel has the advantages of full solid state, fast response speed, wide operating temperature range, etc., and is widely used in display screens of mobile phones, flat panels, vehicle-mounted displays, etc. Disclosure of Invention In one aspect, a display panel is provided. The display panel includes a substrate, an isolation structure, and a light emitting device. The isolation structure is arranged on the substrate and defines a plurality of pixel openings. The pixel opening is provided with a light emitting device. The light emitting device includes a first electrode, a light emitting functional layer, and a second electrode stacked in a direction away from a substrate. The first electrode includes a first sub-layer and a second sub-layer stacked in a direction away from the substrate. The light emitting functional layer includes a first light emitting layer and a second light emitting layer stacked in a direction away from the substrate. The light emitting device includes a first light emitting device and a second light emitting device, and a second sub-layer in the first light emitting device and a second sub-layer in the second light emitting device are different in thickness. The first light emitting layer of the first light emitting device is adjacent to the surface of the substrate, and a first distance is arranged between the first light emitting layer of the first light emitting device and the surface of the first electrode of the first light emitting device adjacent to the substrate. The second light emitting layer of the second light emitting device is adjacent to the surface of the substrate with a second distance from the surface of the first electrode of the second light emitting device adjacent to the substrate. The ratio of the first distance to the second distance is 1.0-1.5. In some embodiments, the light emitting color of the first light emitting layer is a first color, the light emitting color of the second light emitting layer is a second color, and the light wavelength of the first color is greater than the light wavelength of the second color. The light-emitting functional layer further comprises a third light-emitting layer positioned on one side of the first light-emitting layer close to the substrate. The light-emitting color of the third light-emitting layer is a third color, and the wavelength of the light of the second color is larger than that of the light of the third color. The light emitting device further includes a third light emitting device, wherein the second sub-layer in the first light emitting device, the second sub-layer in the second light emitting device, and the second sub-layer in the third light emitting device are all different in thickness. A third distance is arranged between the surface, close to the substrate, of the third light-emitting layer of the third light-emitting device and the surface, close to the substrate, of the first electrode of the third light-emitting device. The ratio of the second distance to the third distance is in the range of 0.8-1.2. In some embodiments, the ratio of the first distance to the third distance ranges from 1.0 to 1.5. In some embodiments, the second electrode layer is adjacent to a surface of the substrate and a fourth distance is provided between the second electrode layer and a surface of the third light emitting layer adjacent to the substrate. The second electrode layer is close to the surface of the substrate, and a fifth distance is arranged between the second electrode layer and the surface of the first light-emitting layer close to the substrate. The ratio of the fourth distance to the fifth distance is 1.8-2.2. In some embodiments, the second sub-layer of the first electrode includes a microcavity conditioning layer and a transparent conductive layer. The micro-cavity adjusting layer is positioned between the first sub-layer of the first electrode and the transparent conducting layer, and the transparent conducting layer is electrically connected with the first sub-layer. The microcavity adjustment layer in the first light-emitting device, the microcavity adjustment layer in the second light-emitting device and the microcavity adjustment layer in the third light-emitting device are all different in thickness. In some embodiments, the material of the microcavity conditioning layer comprises a conductive material. In some embodiments, the material of the microcavity conditioning layer comprises an insulating material. In the same first electrode, the transparent conductive layer covers the side surface of the micro-cavity adjusting layer, and is in contact with and electrically connected with the edge of the first sub-layer. In some embodi