Organic electroluminescent device and display device

An electroluminescent device and luminescent technology, applied in the direction of organic semiconductor devices, electric solid devices, electrical components, etc., can solve the problem of reducing the internal quantum efficiency of organic electroluminescent devices, reducing the external quantum efficiency of organic electroluminescent devices, strong Hole blocking effect and other issues can be achieved to improve the display effect, improve the external quantum efficiency, and increase the excitation rate.

Active Publication Date: 2014-06-18
BOE TECH GRP CO LTD
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] There are two main aspects of energy loss in organic electroluminescent devices: the first aspect of loss is that when injected carriers (referring to electrons and holes) are coupled to emit light in the light-emitting layer, not all of the injected energy is converted into For photons, a part of the excitonic energy is lost through non-radiative transition processes such as lattice vibration and deep-level impurity transitions, which reduces the internal quantum efficiency of organic electroluminescent devices
The second loss is the total emission at the interface between the metal layer (anode or cathode)/glass substrate, glass substrate/air, the waveguide mode between the metal/organic layer interface and the metal layer (anode or cathode) The nearb

Method used

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  • Organic electroluminescent device and display device
  • Organic electroluminescent device and display device
  • Organic electroluminescent device and display device

Examples

Experimental program
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Example Embodiment

[0027] Example 1:

[0028] This embodiment provides an organic electroluminescent device, such as figure 1 As shown, it includes a substrate 1, and an opaque electrode 2, a light-emitting layer 3, and a light-transmitting electrode 4 arranged above the substrate 1. The light-emitting layer 3 is arranged between the opaque electrode 2 and the light-transmitting electrode 4. A scattering layer 5 is also arranged between 3 and the opaque electrode 2, and the scattering layer 5 can make the light emitted by the light emitting layer 3 toward the side of the scattering layer 5 to be totally reflected.

[0029] It should be noted that organic electroluminescent devices are classified into top-emitting organic electroluminescent devices and bottom-emitting organic electroluminescent devices according to the direction in which light is emitted. The top-emission type, that is, the top surface of the organic electroluminescence device, is a light-transmitting surface, and light is emitted fro...

Example Embodiment

[0043] Example 2:

[0044] This embodiment provides an organic electroluminescent device. The difference from Embodiment 1 is as follows: image 3 As shown, the opaque electrode 2 is a cathode, and the light-transmitting electrode 4 is an anode; accordingly, the scattering layer 5 is arranged between the cathode and the light-emitting layer 3; and the electron transport layer 7 is arranged between the cathode and the scattering layer 5.

[0045] Compared with the organic electroluminescent device in embodiment 1, in this embodiment, light is emitted from the bottom surface of the organic electroluminescent device, so the organic electroluminescent device provided in this embodiment is a bottom emission type.

[0046] The other structure of the organic electroluminescent device in this embodiment is the same as that in Embodiment 1, and will not be repeated here.

Example Embodiment

[0047] Example 3:

[0048] This embodiment provides an organic electroluminescent device. The difference from Embodiment 1 is as follows: Figure 4 As shown, the hole transport layer 6 is provided between the light-emitting layer 3 and the scattering layer 5.

[0049] The other structure of the organic electroluminescent device in this embodiment is the same as that in Embodiment 1, and will not be repeated here.

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Abstract

The invention provides an organic electroluminescent device and a display device. The organic electroluminescent device comprises a substrate, an opaque electrode, a luminescent layer and a transparent electrode, wherein the opaque electrode, the luminescent layer and the transparent electrode are arranged above the substrate, the luminescent layer is arranged between the opaque electrode and the transparent electrode, a diffusion layer is also arranged between the luminescent layer and the opaque electrode, and the light, facing one side of the diffusion layer, emitted from the luminescent layer can be fully reflected by the diffusion layer. The organic electroluminescent device has the advantage that by arranging the diffusion layer between the luminescent layer and the opaque electrode, the external quatum efficiency is improved, and the internal quatum efficiency is also improved, so the efficiency is improved. The display device of the organic electroluminescent device can improve the efficiency and display effect.

Description

technical field [0001] The present invention relates to the field of display technology, in particular to an organic electroluminescent device and a display device. Background technique [0002] Organic electroluminescent devices (OLEDs) have the advantages of wide viewing angle, fast response, and wide color gamut as display devices; as lighting devices, they have the characteristics of planarization, no mercury pollution, and high efficiency. They are the development of the next generation of display and lighting. trend. [0003] The structure of the current organic electroluminescent device is basically that there are multiple organic layers sandwiched between two layers of metal. The organic layer includes a light-emitting layer, and the two layers of metal are the anode and cathode of the device. Under the action of external voltage, electrons and holes are injected into the organic layer from the cathode direction and the anode direction respectively and transported, ...

Claims

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Application Information

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IPC IPC(8): H01L51/52H01L51/54
CPCH10K59/00H10K50/854H10K2102/00H10K50/856
Inventor 宋莹莹崔颖刘则
Owner BOE TECH GRP CO LTD
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