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Organic electroluminescent device and manufacturing method thereof

An electroluminescent device and electroluminescent technology, which are applied in the fields of electro-solid devices, semiconductor/solid-state device manufacturing, electrical components, etc., can solve the problems of reduced luminous efficiency of devices and low probability of exciton recombination, and achieve easy evaporation and avoidance of Hole quenching phenomenon, the effect of improving film flatness

Inactive Publication Date: 2015-05-27
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

[0004] In traditional organic electroluminescent devices, the electron transport rate is two or three orders of magnitude lower than the hole transport rate. Therefore, it is very easy to cause a low probability of exciton recombination, and the area where the excitons are recombined is not in the light-emitting area. Thereby reducing the luminous efficiency of the device

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] A method for preparing an organic electroluminescent device, comprising the following steps:

[0048] (1) First use detergent, deionized water, acetone, ethanol, and isopropanol to sonicate the commercially available ordinary glass for 15 minutes each to remove organic pollutants on the glass surface, clean it and air dry it; then use it on the glass substrate ITO with a thickness of 160nm was prepared by magnetron sputtering. The acceleration voltage of magnetron sputtering was 700V, the magnetic field was 120G, and the power density was 25W / cm 2 ; Then adopt the method of thermal resistance evaporation on the anode to prepare hole injection layer, hole transport layer, light-emitting layer and electron transport layer successively; Wherein,

[0049] The hole injection layer is made of MoO 3 , the pressure used in evaporation is 8×10 -4 Pa, the evaporation rate is 2nm / s, and the evaporation thickness is 36nm;

[0050] The material of the hole transport layer is NPB,...

Embodiment 2

[0061] A method for preparing an organic electroluminescent device, comprising the following steps:

[0062] (1) First use detergent, deionized water, acetone, ethanol, and isopropanol to sonicate the commercially available ordinary glass for 15 minutes each to remove organic pollutants on the glass surface, clean it and air dry it; then use it on the glass substrate AZO with a thickness of 300nm was prepared by magnetron sputtering. The acceleration voltage of magnetron sputtering was 300V, the magnetic field was 50G, and the power density was 40W / cm 2 ; Then adopt the method of thermal resistance evaporation on the anode to prepare hole injection layer, hole transport layer, light-emitting layer and electron transport layer successively; Wherein,

[0063] The material of the hole injection layer is WO 3 , the pressure used in evaporation is 2×10 -3 Pa, the evaporation rate is 10nm / s, and the evaporation thickness is 20nm;

[0064] The material of the hole transport layer ...

Embodiment 3

[0074] A method for preparing an organic electroluminescent device, comprising the following steps:

[0075] (1) First use detergent, deionized water, acetone, ethanol, and isopropanol to sonicate the commercially available ordinary glass for 15 minutes each to remove organic pollutants on the glass surface, clean it and air dry it; then use it on the glass substrate ITO with a thickness of 180nm was prepared by magnetron sputtering. The acceleration voltage of magnetron sputtering was 800V, the magnetic field was 200G, and the power density was 1W / cm 2 ; Then adopt the method of thermal resistance evaporation on the anode to prepare hole injection layer, hole transport layer, light-emitting layer and electron transport layer successively; Wherein,

[0076] The hole injection layer is made of MoO 3 , the pressure used in evaporation is 5×10 -5 Pa, the evaporation rate is 1nm / s, and the evaporation thickness is 40nm;

[0077] The material of the hole transport layer is NPB, ...

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Abstract

The invention discloses an organic electroluminescent device and a manufacturing method thereof. The organic electroluminescent device comprises a glass substrate, a conductive anode, a hole injection layer, a hole transmission layer, a luminous layer, an electron transmission layer, an electron injection layer and a cathode which are stacked in sequence, wherein the electron injection layer comprises a rhenium compound doped layer, a rubidium compound layer and a metal layer which are stacked in sequence; the rhenium compound doped layer is arranged on the surface of the electron transmission layer and made from a mixed material formed by mixing a rhenium compound with a bipolar organic material at a mass ratio of (1:1) to (4:1); the rubidium compound layer is made from rubidium carbonate, rubidium chloride, rubidium nitrate or rubidium sulfate; the metal layer is made from low-work-function metal with the work function ranging from -2.0 eV to -3.5 eV. The electron injection layer can effectively improve the luminous efficiency of the device.

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] 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. Brightness up to 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 matter. Electrons and holes meet, recombine, and form excitons in the ligh...

Claims

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Application Information

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IPC IPC(8): H01L51/50H01L51/54H01L51/56
Inventor 周明杰黄辉张振华王平
Owner OCEANS KING LIGHTING SCI&TECH CO LTD
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