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Organic light-emitting device and preparation method thereof

An electroluminescent device and luminescent technology, which is applied in the direction of electric solid-state devices, semiconductor/solid-state device manufacturing, electrical components, etc., can solve the imbalance between electron and hole injection, the inability to generate photons, and hinder the light emission of organic electroluminescent devices Efficiency and other issues, to achieve the effect of improving luminous efficiency, improving balance, and improving injection capacity

Inactive Publication Date: 2015-06-24
OCEANS KING LIGHTING SCI&TECH CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For the existing organic electroluminescent devices, the conductivity of organic molecules to holes is much greater than that of electrons, and the electron transport rate is two or three orders of magnitude lower than the hole transport rate. The imbalance of hole injection makes the recombination region where electrons and holes recombine to form excitons not in the light-emitting layer area. After the excitons are formed in the recombination region, they diffuse to both sides, and some excitons will diffuse to other parts of the undoped light-emitting material. area, and then decay, so that photons cannot be generated, which greatly hinders the luminous efficiency of organic electroluminescent devices

Method used

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  • Organic light-emitting device and preparation method thereof

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Embodiment 1

[0044] A method for preparing an organic electroluminescent device, comprising the steps of:

[0045] a) Production of anode conductive film: Rinse commercially available ordinary glass with distilled water and ethanol, soak it in isopropanol for one night, and use it as a glass substrate; An anode conductive film is prepared on the surface of the substrate, and the process conditions are: the degree of vacuum is 8×10 -4 Pa, the accelerating voltage is 700V, the magnetic field is 120G, and the power density is 25W / cm 2 ; The anode conductive film is made of indium tin oxide (ITO) with a thickness of 120nm.

[0046] b) Preparation of the hole injection layer: The hole injection layer was prepared on the surface of the anode conductive film layer by vacuum evaporation, and the process conditions were: the vacuum degree was 8×10 -4 Pa, the evaporation rate is 4nm / s; the material of the hole injection layer includes molybdenum trioxide (MoO 3 ), with a thickness of 35nm.

[00...

Embodiment 2

[0056] A method for preparing an organic electroluminescent device, comprising the steps of:

[0057] a) Production of anode conductive film: Rinse commercially available ordinary glass with distilled water and ethanol, soak it in isopropanol for one night, and use it as a glass substrate; An anode conductive film is prepared on the surface of the substrate, and the process conditions are: the degree of vacuum is 2×10 -3 Pa, the accelerating voltage is 300V, the magnetic field is 50G, and the power density is 40W / cm 2 ; The material of the anode conductive film is aluminum-doped zinc oxide (AZO), and the thickness is 300nm.

[0058] b) Preparation of the hole injection layer: The hole injection layer was prepared on the surface of the anode conductive film layer by vacuum evaporation, and the process conditions were: the vacuum degree was 2×10 -3Pa, the evaporation rate is 10nm / s; the material of the hole injection layer includes tungsten trioxide (WO 3 ), with a thickness ...

Embodiment 3

[0065] A method for preparing an organic electroluminescent device, comprising the steps of:

[0066] a) Preparation of anode conductive film: Rinse commercially available ordinary glass with distilled water and ethanol, soak it in isopropanol for one night, and use it as a glass substrate; An anode conductive film is prepared on the surface of the substrate, and the process conditions are: the degree of vacuum is 5×10 -5 Pa, the accelerating voltage is 800V, the magnetic field is 200G, and the power density is 1W / cm 2 ; The anode conductive film is made of indium-doped zinc oxide (IZO) with a thickness of 150nm.

[0067] b) Preparation of the hole injection layer: The hole injection layer was prepared on the surface of the anode conductive film layer by vacuum evaporation, and the process conditions were: the vacuum degree was 5×10 -5 Pa, the evaporation rate is 1nm / s; the material of the hole injection layer includes vanadium pentoxide (V 2 o 5 ), with a thickness of 55n...

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Abstract

The invention discloses an organic light-emitting device. The organic light-emitting device comprises a glass substrate, an anode conductive thin film, an organic light-emitting function layer and a cathode, wherein the anode conductive thin film, the organic light-emitting function layer and the cathode are sequentially arranged on the surface of the glass substrate in an overlapping mode. The organic light-emitting function layer at least comprises a light-emitting layer and electron injection layers, wherein the light-emitting layer and the electron injection layers are sequentially arranged on the surface of the anode conductive thin film in an overlapping mode. The electron injection layers include the first electron injection layer and the second electron injection layer which are sequentially arranged on the surface of the light-emitting layer in an overlapping mode. The first electron injection layer is made of fullerene derivative. The second electron injection layer is made of thiophene compounds and molysite. Through the electron injection layers of a double-layer structure, electron injection barriers between the cathode and the organic light-emitting function layer are reduced, the electron injection capacity is improved, and therefore the electron and hole composite rate is increased; meanwhile, the electron transport speed is increased, and therefore the electron and hole injection balance is improved, and then the light-emitting efficiency of the organic light-emitting device is improved.

Description

technical field [0001] The invention relates to the field of organic electroluminescence, in particular to an organic electroluminescence device and a preparation method thereof. Background technique [0002] Organic electroluminescent device (OLED) is a kind of electric light source. 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, which enabled the research of organic electroluminescent devices to be carried out rapidly and widely around the world. [0003] The principle of light emission of organic electroluminescent devices: First, under the action of an external electric field, electrons are injected from the cathode to the lowest occupied molecular orbital (LUMO) of organic molecules, and at the same time, holes are injected from the anode to the organic molecules. The highest occupied orbital (HOMO); then, electrons and holes meet and recombine in the light-emitting l...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01L51/52H01L51/54H01L51/56
CPCH10K50/171H10K71/00
Inventor 周明杰黄辉陈吉星王平
Owner OCEANS KING LIGHTING SCI&TECH CO LTD
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