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Organize EL part and its making method

An electroluminescence device and luminescence technology, which is applied in the direction of electroluminescence light source, electric solid-state device, semiconductor/solid-state device manufacturing, etc., can solve the problems of poor thermal stability and limited application

Active Publication Date: 2007-10-17
BEIJING VISIONOX TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Studies have shown that some simple organic salts of Cs, such as cesium acetate and cesium benzoate, have poor thermal stability and will decompose during vacuum evaporation, which limits their application.

Method used

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  • Organize EL part and its making method
  • Organize EL part and its making method
  • Organize EL part and its making method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] The cesium salts of nitrogen-containing aromatic phenols in the present invention are prepared by reacting nitrogen-containing aromatic phenols with cesium hydroxide. First is the preparation of cesium 8-hydroxyquinoline (Csq for short), and the reaction equation is as shown in equation (1):

[0035]

[0036] The synthesis reaction adopts a device with a water separator and a spherical condenser, uses cyclohexane as a water-carrying agent, and uses the principle of cyclohexane and water to form an azeotropic mixture to remove the water generated by the reaction, and promote the salt-forming reaction to the positive direction To carry out, in the preparation process, first put the mixture of 8-hydroxyquinoline and cesium hydroxide with one water molecule into a flask with a water separator and a spherical condenser, heat and reflux in an oil bath at 150°C for 12 hours, A bright yellow precipitate was formed, which was filtered, washed several times with cyclohexane, d...

Embodiment 2

[0051] The synthesis of 2-methyl-8-hydroxyquinoline cesium (Csmq for short), synthetic method is the same as embodiment 1, just replaces 8-hydroxyquinoline with 2-methyl-8-hydroxyquinoline, and concrete reaction formula is as equation ( 2) as shown:

[0052]

[0053] The preparation method and device performance research of the organic electroluminescent device with 2-methyl-8-hydroxyquinoline cesium as the cathode modification layer are also the same as in Example 1.

Embodiment 3

[0055] The synthesis of 2-phenyliminomethylphenol cesium (abbreviated as CsPIMP), synthetic method is the same as embodiment 1, just replaces 8 hydroxyquinoline with 2-phenyliminomethylphenol, and concrete reaction formula is as equation (3) Shown:

[0056]

[0057] The preparation method of the organic electroluminescent device used as the cathode modification layer and the research on device performance are also the same as in Example 1.

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Abstract

The invention relates to an organic electroluminescence device, comprising an anode layer, an organic functional layer and a cathode layer in order, which is characterized in that a cathode decorative layer made of the alkali metal salt of nitrogenous fragrant phenol is also included between said organic functional layer and the cathode layer, wherein, the alkali metal salt is preferredly a metal cesium salt. The invention has gotten higher device performance when it is used in conjunction with the high work function metallic cathode, through the development of the cathode interface decorative material of membrane that has a high rejection membrane electron injection ability.

Description

technical field [0001] The invention relates to the technical field of organic electroluminescence display, in particular to an organic electroluminescence display device containing a cathode modification layer and a preparation method thereof. Background technique [0002] Organic electroluminescent devices, also known as organic light-emitting diodes (OLEDs), are formed by preparing an organic compound film with charge transport function or electroluminescence function between two thin film electrodes (anode and cathode). of luminous body. Electron injection at the cathode of OLED devices is crucial to the improvement of device efficiency and stability. In order to overcome the Schottky barrier at the interface between the cathode metal and the organic semiconductor, an effective method is to use metals with low work function to promote electron thermal emission injection. As in traditional N,N'-(α-naphthyl)-N,N'-phenylbiphenyldiamine (NPB) / tris(8-hydroxyquinoline)alumin...

Claims

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Application Information

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IPC IPC(8): H01L51/50H01L51/54H05B33/12
Inventor 邱勇李扬段炼
Owner BEIJING VISIONOX TECH
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