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Inverted organic electroluminescence device and its preparation method

An electroluminescent device, an inverted technology, applied in the direction of electrical solid-state devices, semiconductor/solid-state device manufacturing, electrical components, etc., can solve the problems of not considering the optical performance of the device, the influence of the optical performance of the inverted device, etc., and achieve good optical effects , good electron injection ability and cost-saving effect

Active Publication Date: 2018-02-02
FIFTH ELECTRONICS RES INST OF MINIST OF IND & INFORMATION TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In the prior art, although the electron injection ability of the inverted OLED device has been improved to a certain extent, that is, the electrical performance of the device has been improved, but the optical performance of the device has not been considered
Especially with ZnO, TiO 2 Inorganic materials with a large difference in refractive index have not been considered when inserting the ITO cathode and electron transport layer as the electron injection layer.
[0007] It can be seen that the processing methods in the prior art generally have an impact on the optical performance of the inverted device

Method used

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  • Inverted organic electroluminescence device and its preparation method
  • Inverted organic electroluminescence device and its preparation method

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Experimental program
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Effect test

Embodiment 1

[0028] ITO: indium tin oxide;

[0029] SiO 2 : silicon dioxide;

[0030] TiO 2 :Titanium dioxide

[0031] NPB: (N,N'-diphenyl-N,N'-(1-naphthyl)-1,1'-biphenyl-4,4'-diamine);

[0032] C545T: 2,3,6,7-tetrahydro-1,1,7,7-tetramethyl-1H,5H,11H-10-(2-benzothiazolyl)-quinazino[9,9A, 1GH] coumarin;

[0033] MADN: 2-methyl-9,10-bis(naphthalen-2-yl)anthracene

[0034] Alq 3 : aluminum octahydroxyquinoline;

[0035] Al: aluminum.

[0036] The structure of the prepared device A1 is: Glass (substrate) / ITO (cathode layer) / TiO 2 : SiO 2 (electron injection layer) / Alq 3 (electron transport layer) / MADN: C545T (green fluorescent light-emitting layer) / NPB (hole transport layer) / MoO3( hole injection layer) / Al (anode layer).

[0037] The optical refractive index of the electron injection layer is 1.78.

[0038] The preparation method is as follows:

[0039] After selecting the glass substrate, prepare the ITO cathode layer, TiO 2 : SiO 2 Electron injection layer, Alq ...

Embodiment 2

[0050] ITO: indium tin oxide;

[0051] ZnO: zinc oxide;

[0052] MgF2: magnesium fluoride

[0053] NPB: (N,N'-diphenyl-N,N'-(1-naphthyl)-1,1'-biphenyl-4,4'-diamine);

[0054] C545T: 2,3,6,7-tetrahydro-1,1,7,7-tetramethyl-1H,5H,11H-10-(2-benzothiazolyl)-quinazino[9,9A, 1GH] coumarin;

[0055] MADN: 2-methyl-9,10-bis(naphthalen-2-yl)anthracene

[0056] Alq 3 : aluminum octahydroxyquinoline;

[0057] Al: aluminum.

[0058] The structure of the prepared device A2 is: PEN (substrate) / ITO (cathode layer) / ZnO:MgF 2 (electron injection layer) / Alq 3 (electron transport layer) / Alq 3 : C545T (green fluorescent light-emitting layer) / NPB (hole transport layer) / WO3( hole injection layer) / Al (anode layer).

[0059] The optical refractive index of the electron injection layer is 1.82.

[0060] The preparation method is as follows:

[0061] After selecting the PEN substrate, prepare the ITO cathode layer, ZnO:MgF 2 Electron injection layer, Alq 3 electron transp...

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Abstract

The invention relates to an inverted organic electroluminescence device, which comprises a substrate, a cathode layer, an electron injection layer, an organic functional layer and an anode layer stacked in sequence, and the organic functional layer includes an electron transport layer, a light emitting layer, and an anode layer stacked in sequence. A hole transport layer, a hole injection layer, the optical refractive index of the electron injection layer is between the cathode layer and the electron transport layer. The inverted organic electroluminescent device of the present invention has the characteristics of good electron injection ability and good optical effect. When the device obtains the same brightness, it only needs a small current, and the working voltage of the device is greatly reduced, so the service life of the device will be greatly improved. Extending, saving costs, and facilitating the commercialization of devices.

Description

technical field [0001] The invention relates to the technical field of organic semiconductors, in particular to an inverted organic electroluminescence device and a preparation method thereof. Background technique [0002] OLED (English full name is Organic Light Emitting Diodes, which means organic electroluminescent device, referred to as OLED) has independent light emission, wide viewing angle, light weight, wide temperature range, large area, full curing, flexibility, low power consumption, responsive It has many advantages such as high speed and low manufacturing cost, and has important applications in the fields of display and lighting, so it has attracted extensive attention from academia and industry. [0003] Traditional OLED devices generally adopt a positive structure. Generally, indium tin oxide (Indium Tin Oxide, ITO), indium zinc oxide (Indium Zinc Oxide, IZO), etc. are deposited on glass as transparent anodes, and metals with high reflectivity are used as tran...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01L51/50H01L51/56
CPCH10K71/12H10K50/171
Inventor 罗东向刘佰全黄林轶徐华伟胡坚耀范林勇黄庆礼贺致远陈玉明
Owner FIFTH ELECTRONICS RES INST OF MINIST OF IND & INFORMATION TECH