Cathode injection material, and manufacturing method and application thereof

A cathode injection and cesium salt technology, applied in the field of electric light sources, can solve the problems of difficult electron injection, sensitivity, and high work function, and achieve the effects of enhanced electron injection efficiency, easy acquisition, and low cost

Active Publication Date: 2012-05-23
OCEANS KING LIGHTING SCI&TECH CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Some commonly used cathodes (such as Al, Ag or Au, etc.) have relatively high work functions and are difficult to inject electrons.

Method used

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  • Cathode injection material, and manufacturing method and application thereof
  • Cathode injection material, and manufacturing method and application thereof
  • Cathode injection material, and manufacturing method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0031] Embodiments of the present invention also provide a method for preparing the cathode injection material, such as figure 1 As shown, the method includes the following steps:

[0032] S1: prepare a nano-titanium dioxide solution, mix the nano-titanium dioxide with an alcohol solvent or / and secondary distilled water, and prepare a nano-titanium dioxide solution with a mass concentration of 0.1-2%;

[0033] S2: prepare a cesium salt solution, mix the cesium salt with an alcohol or ether solvent to prepare a cesium salt solution with a mass concentration of 0.1-2%;

[0034] S3: mixing the nano titanium dioxide solution with the cesium salt solution to obtain a mixed solution;

[0035] S4: spin-coating the mixed solution on the conductive substrate, heating and drying to obtain a cathode injection material.

[0036] The above-mentioned preparation method of the cathode injection material only needs to mix the nano-titanium dioxide and cesium salt, coat it on the substrate, ...

Example Embodiment

[0059] Example 1

[0060] The structure of the organic electroluminescent device of this embodiment is as follows: figure 2 As shown, the organic electroluminescent device includes a cathode 1 of the organic electroluminescent device, and an electron transport layer 21, a light-emitting layer 22, a hole transport layer 23, and a hole injection layer 24 which are sequentially combined with the cathode 1 of the organic electroluminescent device. and anode 3. The organic electroluminescent device cathode 1 includes a conductive substrate 11 and a cathode injection layer 12 combined on the surface of the conductive substrate 11 .

[0061] The conductive substrate 11 is made of indium tin oxide glass (ITO glass), the cathode injection layer 12 is 50 nm thick, the electron transport layer 21 is a 50 nm thick PBD layer, and the light emitting layer 22 is 70 nm thick AlQ 3 Layer, hole transport layer 23 is 40nm thick TPD layer, hole injection layer 2410nm thick MoO 3 Layer and anode...

Example Embodiment

[0074] Example 2

[0075] The structure of the organic electroluminescent device in this embodiment is the same as that in Embodiment 1 and figure 2 shown. Its preparation method is as follows:

[0076] (1) The ITO glass is subjected to photolithography treatment, and is cut into the required light-emitting area, and then ultrasonicated for 15 minutes each with detergent, deionized water, acetone, ethanol, and isopropanol in turn, and then oxygen plasma treatment is performed on it after cleaning. , the oxygen plasma treatment time is 5min, the power is 50W, in order to reduce the roughness and contact angle of the conductive glass surface, improve the wettability and adsorption of the surface, remove the organic pollutants on the conductive glass surface, and prepare the conductive substrate 11;

[0077] (2) Preparation of cathode injection material:

[0078] (21) Commercially available TiO with a particle size of 20 nm 2 The particles and anhydrous ethanol are prepared ...

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Abstract

The invention discloses a cathode injection material, and a manufacturing method and an application thereof. The cathode injection material comprises nano-titanium dioxide and a cesium salt doped mutually. The manufacturing method comprises the following steps of: preparing a nano-titanium dioxide solution and a cesium salt solution respectively; mixing a nano-titanium dioxide solution dispersion system with the cesium salt solution to obtain a mixed solution; and coating the mixed solution onto a conductive substrate in a spinning way, and heating and drying to obtain the cathode injection material. The cathode injection material disclosed by the invention has the advantages of low cost, capability of effectively enhancing the input and the transmission of charges, increase in the LUMO energy level of a cathode when applied to an organic electroluminescent device, matching with the energy level of an organic electroluminescent structure, reduction in a potential barrier between the cathode injection material and the organic electroluminescent structure, more suitability for electron injection, increase in the electron injection efficiency, preferable increase in the light extraction capability of the organic electroluminescent device, high luminance and long service life. The manufacturing method of the cathode injection material has a simple procedure and high production efficiency.

Description

technical field [0001] The invention belongs to the technical field of electric light sources, and in particular relates to a cathode injection material and its preparation method and application. Background technique [0002] The electric light source industry has always been a hotspot of research by countries all over the world, and occupies a very important position in the world economy. At present, the widely used light source is gas discharge light source. The principle of this light source is to fill the inside of the lamp with a mixed gas containing mercury after vacuuming, and use gas discharge to emit light or ultraviolet light generated by gas discharge to excite phosphors to emit light. However, the pulsed flashes of gas discharge light sources can easily cause visual fatigue, and mercury pollutes the environment. With the advancement of society and technology, research and development of energy-saving and environmentally friendly green light sources to replace tr...

Claims

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Application Information

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IPC IPC(8): H01L51/50H01L51/54H01L51/56C01G23/047
Inventor 周明杰王平黄辉冯小明
Owner OCEANS KING LIGHTING SCI&TECH CO LTD
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