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Organic electroluminescent device and manufacturing method

An electroluminescent device, an organic technology, applied in the direction of electrical solid-state devices, semiconductor/solid-state device manufacturing, electrical components, etc., can solve the problems of organic electroluminescent devices such as reduced luminous efficiency and inability to generate photons

Inactive Publication Date: 2015-09-23
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 existing organic electroluminescent devices, holes and electrons are often transported through the light-emitting layer to the cathode and anode respectively. Therefore, the recombination interface of holes and electrons is changed. After the holes and electrons form excitons at the recombination interface Diffusion to both sides, a part of the excitons will diffuse to other regions of the undoped light-emitting material, and then decay, so that photons cannot be generated, which reduces the luminous efficiency of the organic electroluminescent device

Method used

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  • Organic electroluminescent device and manufacturing method
  • Organic electroluminescent device and manufacturing method
  • Organic electroluminescent device and manufacturing method

Examples

Experimental program
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Effect test

Embodiment 1

[0058] A method for preparing an organic electroluminescent device, comprising the steps of:

[0059] 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.

[0060] b) Preparation of the electron blocking layer: The electron blocking layer is prepared on the surface of the anode conductive film by means of thermal resistance evaporation, and the process conditions are: the degree of vacuum is 8×10 -4 Pa, the evaporation rate is 2nm / s; the material of the electron blocking layer is cesium fluoride (CsF) and 3-hexylthiophene (3...

Embodiment 2

[0067] A method for preparing an organic electroluminescent device, comprising the steps of:

[0068] 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.

[0069] 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 2nm / s; the hole injection layer is made of molybdenum trioxide (MoO 3 ), with a thickness of 35nm.

[0070] c) Prepara...

Embodiment 3

[0079] A method for preparing an organic electroluminescent device, comprising the steps of:

[0080] 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 anode conductive film is made of indium-doped zinc oxide (IZO) with a thickness of 300nm.

[0081] 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 -3 Pa, the evaporation rate is 10nm / s; the hole injection layer is made of tungsten trioxide (WO 3 ), with a thickness of 20nm.

[0082] c) Pre...

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Abstract

The invention discloses an organic electroluminescent device. The device comprises an organic luminescence function layer. The organic luminescence function layer at least comprises an electronic blocking layer, a luminescent layer and a hole blocking layer which are successively stacked and arranged on a surface of the anode conduction film. A material of the electronic blocking layer is a first mixture formed by cesium salt and a thiophene compound or a second mixture formed by ferric salt and the thiophene compound or a third mixture formed by metal sulfide and the thiophene compound. A material of the hole blocking layer is a hole doping object material, or a fourth mixture formed by a fluorescence material and a beryllium complex or a fifth mixture formed by an electronic transmission material and the hole doping object material. Two sides of the luminescent layer are provided with the electronic blocking layer and the hole blocking layer respectively so that electrons and holes are effectively limited in the luminescent layer. Attenuation of excitons formed through recombining parts of electrons and the holes is prevented so that luminescence efficiency of the organic electroluminescent device is increased.

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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IPC IPC(8): H01L51/52H01L51/54H01L51/56
Inventor 周明杰黄辉陈吉星王平
Owner OCEANS KING LIGHTING SCI&TECH CO LTD