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Inverted top-emitting organic electroluminescence device and manufacturing method thereof

A luminescence and top-emission technology, which is applied in the manufacture of organic semiconductor devices, electrical solid devices, semiconductor/solid devices, etc., can solve the problems of difficult evaporation temperature, inconsistent evaporation temperature, low luminous efficiency of devices, etc., and achieve enhanced transmission rate, Enhance the front luminous intensity and improve the effect of luminous efficiency

Inactive Publication Date: 2014-02-12
OCEANS KING LIGHTING SCI&TECH CO LTD +1
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AI Technical Summary

Problems solved by technology

[0004] In traditional light-emitting devices, an electron transport layer is generally prepared to increase the electron transport rate, and an electron injection layer is prepared to improve the electron injection efficiency, and the electron transport rate is usually lower than the hole transport rate. Two or three orders of magnitude. Therefore, the electron transport layer is usually n-doped, that is, the electron transport layer is doped with metal, such as doping Cs salt into Bphen and Li salt into TPBi to improve Electron transfer rate, this method is widely used, and can effectively increase the electron transfer rate, but the evaporation temperature is inconsistent between organic matter and inorganic matter, which brings difficulties to the evaporation temperature, and the rate increase is not high. In addition, the thickness cannot If it is made too thin (below 40nm), when the luminescent material is close to the metal electrode, the luminescent material will couple with the metal electrode, causing a loss to the excitons (surface plasmon waves), and the thickness is too thick (higher than 100nm), the number of defects increases, and the existence of electron traps will cause electrons or holes to enter the traps, resulting in a decrease in the probability of exciton recombination, which in turn makes the luminous efficiency of the device low

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  • Inverted top-emitting organic electroluminescence device and manufacturing method thereof
  • Inverted top-emitting organic electroluminescence device and manufacturing method thereof

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preparation example Construction

[0034] The present invention also provides a method for preparing the above-mentioned inverted top-emitting organic electroluminescent device, comprising the following steps:

[0035] S1. First, the cathode substrate is subjected to photolithography treatment, and then ultrasonically cleaned with detergent, deionized water, acetone, ethanol, and isopropanol for 15 minutes to remove organic pollutants on the surface of the cathode substrate;

[0036] S2, preparation of electron transport layer:

[0037] First, the carbon aerogel and the electron transport material are mixed according to the mass ratio of 0.1:1-2 to form a doped mixed material;

[0038] Second, add the doped mixed material into the solvent to form a mixed solution with a concentration of 5-20%;

[0039] Finally, the mixed solution is spin-coated on the surface of the conductive cathode layer of the cathode substrate, and the thickness is controlled to be 40-200nm, and after drying, the electron transport layer ...

Embodiment 1

[0049] 1. First, photolithographically process the ITO glass, cut it into the required size, and then use detergent, deionized water, acetone, ethanol, and isopropanol to ultrasonically clean it for 15 minutes to remove organic pollutants on the surface of the ITO glass;

[0050] 2. Preparation of electron transport layer:

[0051] First, the carbon airgel with a particle size of 20nm and TPBi are mixed according to the mass ratio of 0.5:2 to form a doped mixed material;

[0052] Secondly, the doping mixed material is added to chlorobenzene to form a mixed solution with a concentration of 10%;

[0053] Finally, the mixed solution is spin-coated on the ITO layer surface of the ITO glass, and the thickness is controlled to be 150nm; after drying, the electron transport layer is obtained, which is expressed as carbon airgel: TPBi;

[0054] 3. On the surface of the electron transport layer, the vapor-deposited light-emitting layer is sequentially stacked, and the material is Alq ...

Embodiment 2

[0057] 1. First, photolithographically process the IZO glass, cut it into the required size, and then use detergent, deionized water, acetone, ethanol, and isopropanol to ultrasonically clean it for 15 minutes to remove organic pollutants on the surface of the IZO glass;

[0058] 2. Preparation of electron transport layer:

[0059] First, carbon aerogel with a particle size of 2nm and TAZ are mixed according to the mass ratio of 0.1:2 to form a doped mixed material;

[0060] Secondly, adding the doped mixed material into dichloromethane to configure a mixed solution with a concentration of 20%;

[0061] Finally, the mixed solution is spin-coated on the surface of the IZO layer of the IZO glass, and the thickness is controlled to be 40nm; after drying, the electron transport layer is obtained, which is expressed as: carbon airgel TAZ;

[0062] 3. On the surface of the electron transport layer, the vapor-deposited light-emitting layer is sequentially stacked, the material is DC...

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Abstract

The invention belongs to the field of organic semiconductor materials and discloses an inverted top-emitting organic electroluminescence device and a manufacturing method thereof. The device comprises a cathode substrate, an electronic transmission layer, a light-emitting layer, a hole transporting layer, a hole injection layer and an anode layer which are sequentially stacked. The electronic transmission layer is made from a doped mixed material consisting of carbon aerogel and an electronic transmission material by mass ratio 0.1:1-2. The electronic transmission material is Bphen, TAZ or TPBi. The electronic transmission layer doped with the carbon aerogel of the inverted top-emitting organic electroluminescence device can improve the electronic transmission speed and the luminous efficiency. In addition, due to a hole structure of the carbon aerogel, light can be refracted, the front-side luminous intensity of the device can be enhanced, and finally the luminous brightness can be improved.

Description

technical field [0001] The invention relates to the field of organic semiconductor materials, in particular to an inverted top-emitting organic electroluminescent device and a preparation method thereof. Background technique [0002] In 1987, C.W.Tang and Van Slyke of Eastman Kodak Company in the United States reported a breakthrough in the research of organic electroluminescence. A high-brightness, high-efficiency double-layer organic electroluminescent device (OLED) has been prepared using ultra-thin film technology. In this double-layer structure device, the brightness reaches 1000cd / m at 10V 2 , its luminous efficiency is 1.51lm / W, and its lifespan is more than 100 hours. [0003] The principle of OLED light emission is based on the action of an external electric field, electrons are injected from the cathode to the lowest unoccupied molecular orbital (LUMO) of organic matter, and holes are injected from the anode to the highest occupied orbital (HOMO) of organic matte...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01L51/50H01L51/56
CPCH10K85/111H10K50/165H10K50/858H10K2102/00H10K2102/321H10K71/00
Inventor 周明杰王平黄辉陈吉星
Owner OCEANS KING LIGHTING SCI&TECH CO LTD
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