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An organic electroluminescent device

An electroluminescence device and electroluminescence technology, which are applied in the direction of electro-solid devices, electrical components, semiconductor devices, etc., can solve the problems of poor display effect, etc., and achieve the effect of wide selection of materials and high light extraction efficiency.

Active Publication Date: 2018-02-27
GUAN YEOLIGHT TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] For this reason, what the present invention intends to solve is the problem that the display effect of the existing mirror screen body is poor due to the loss of surface plasmon light. The method of setting microholes on the surface of the device can fully extract the surface plasmon light of the device, which not only improves the light extraction efficiency, but also has high definition while maintaining specular reflection.

Method used

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  • An organic electroluminescent device
  • An organic electroluminescent device
  • An organic electroluminescent device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] Embodiment 1 The light extraction layer is arranged between the ITO and the organic functional layer NPB, the cross-section of the micro-columns 6 is triangular, and the cross-sectional area of ​​all the micro-columns 6 is 3% of the total area of ​​the light-extraction layer, and the adjacent micro-columns The distance d between the bodies is 100 μm.

[0048] The device structure of embodiment 1 is:

[0049] Glass / ITO / triangular prism extraction layer(50nm) / NPB(80nm) / Alq 3 :2%C545T(30nm) / Alq 3 (30nm) / LiF(1nm) / Al(150nm)

Embodiment 2

[0050] Embodiment 2: the light extraction layer is arranged between ITO and NPB, the cross-section of the micro-column 6 is hexagonal, and the cross-sectional area of ​​all micro-columns 6 is 3% of the total area of ​​the light-extraction layer, and the adjacent micro-columns The distance d between the bodies is 100 μm.

[0051] The device structure of embodiment 2 is:

[0052] Glass / ITO / Hexagonal Column Extraction Layer(50nm) / NPB(80nm) / Alq 3 :2%C545T(30nm) / Alq 3 (30nm) / LiF(1nm) / Al(150nm)

Embodiment 3

[0053] Embodiment 3: the light extraction layer is arranged between ITO and NPB, the cross-section of microholes 7 is circular, and the cross-sectional area of ​​all microholes 7 is 3% of the total area of ​​the light extraction layer, between adjacent microholes 7 The distance d is 100 μm.

[0054] The device structure of embodiment 3 is:

[0055] Glass / ITO / cylindrical extraction layer(50nm) / NPB(80nm) / Alq 3 :2%C545T(30nm) / Alq 3 (30nm) / LiF(1nm) / Al(150nm).

[0056] Table 1 comparative example and embodiment 1-3 performance test result

[0057]

[0058] The test results show that the light extraction efficiency of the device of the present invention can be increased by at least 21% after adopting the micro-column light extraction layer, and the embodiment 2 is even as high as 25%. It can be seen that the efficiency of the device is significantly improved by using the light extraction layer.

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Abstract

The invention discloses an organic electroluminescent device, comprising a substrate and an organic electroluminescent unit arranged on the substrate, wherein the organic electroluminescent unit comprises a first electrode layer, an organic functional layer and a second electrode layer stacked in sequence, and the first electrode layer is arranged close to the substrate; the organic electroluminescent device further comprises a light extraction layer arranged between the substrate and the second electrode layer, a plurality of different interface regions for changing the flatness of a second electrode reflecting interface are formed in the light extraction layer, and the different interface regions occupy 0.1-30% of the area of the light extraction layer. The device has high definition while keeping mirror reflection.

Description

technical field [0001] The invention relates to the field of organic electroluminescence, in particular to an organic electroluminescence device with high light extraction efficiency. Background technique [0002] After nearly 30 years of development, organic electroluminescent devices (English full name Organic Light Emitting Device, referred to as OLED) as the next generation of lighting and display technology, has a wide color gamut, fast response, wide viewing angle, no pollution, high contrast, Advantages such as planarization have been applied to a certain extent in lighting and display. A typical organic electroluminescent device generally includes a transparent substrate 1 , a first transparent electrode 3 , a second electrode 5 , and an organic functional layer 4 disposed between the two electrodes. Usually the cathode of the bottom-emitting OLED is a flat metal, which has a good reflection effect. The reflective surface can be applied in many fields, such as vani...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01L51/50H01L51/52
Inventor 张国辉董艳波王静李曼胡永岚
Owner GUAN YEOLIGHT TECH CO LTD
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