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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. In addition, these cathodes also have some other disadvantages, such as high cost and sensitivity in water and oxygen environments.

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

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preparation example Construction

[0031] The embodiment of the present invention also provides the preparation method of the cathode injection material, such as figure 1 As shown, the method includes the following steps:

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

[0033] S2: preparing a cesium salt solution, mixing 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-coat the mixed solution on the conductive substrate, heat and dry to obtain the cathode injection material.

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

Embodiment 1

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

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

Embodiment 2

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

[0076] (1) Photolithographically process the ITO glass, cut it into the required light-emitting area, and then use detergent, deionized water, acetone, ethanol, and isopropanol to ultrasonically clean it for 15 minutes, and then perform oxygen plasma treatment on it , the oxygen plasma treatment time is 5min, and the power is 50W, 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 20nm 2 Particles and absolute ethanol were formulated into a solution with a mass fraction of 0.2%, and the solvent was added dropwise w...

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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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