TWI220640B - Polymer organic light emitting device with cross-linked emitting layer and manufacturing method thereof - Google Patents

Abstract

This invention provides a polymer light emitting device with crosslinked emitting layer and a manufacturing method thereof, which uses a thermal crosslinking process to manufacture a polymer emitting layer on top of the device. Because the polymer emitting layer performed with the thermal crosslinking process is not damaged by solvent, an electron transport material can be coated on the emitting layer, which is followed by vapor depositing a metal cathode layer on the electron transport layer and packaging process to obtain a polymer organic light emitting device comprising a hole transport layer, an emitting layer and an electron transport layer.

Description

1220640 Far basket 92113668

V. Description of the invention (1) [Technical field to which the invention belongs] tj The present invention is a polymer organic light-emitting element with a cross-linked light-emitting layer and a method for manufacturing the same, especially a method for thermally cross-linking a polymer light-emitting layer. The manufacturing process allows an electron transport layer to be provided on the fluorene molecular organic light-emitting element, and the electron transport layer is used to increase the efficiency of electron injection and transmission. [Previous technology] Because organic light emitting diode (0rganic Hght emitting diode '0LED) has self-luminous, thin thickness, fast response speed, wide viewing angle, good resolution, high brightness, can be used for flexible panels and operating temperature Many advantages such as a wide range are considered to be thin film liquid crystal display (TFT-LCD) is a new generation of flat display technology, and the light-emitting principle of the organic light-emitting diode (〇LED) It uses the characteristics of the material to combine the electron holes on the light-emitting layer, and reduces the electrons from the excited state back to the ground state, and releases the excess energy in the form of light waves, thus achieving light-emitting elements with different light wavelengths. produce. The anode (Anode) is a transparent conductive film of indium tin oxide (I TO). It is attached to a glass or transparent plastic substrate by sputtering or evaporation. The cathode contains magnesium (M g), Metals such as aluminum (A i) and warp (L i) are 'luminous regions' formed by multiple organic thin films between the two electrodes, including electricity. In the same way, the main entrance region (H0ie injection iayer; HIL · ) Hole Transport Layer (HTL) organic light emitting layer (Emitting layer) and electron transfer layer (Eiectr〇n

Transport Layer; ETL), in actual application mass production, based on different

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/ Consideration 'sometimes includes other different films. Divided into organic light-emitting diodes depending on the material used in the organic light-emitting layer, can be: small molecules of organic light-emitting diodes (Organic high eight T tmiUing Di〇de; oLED) based on dyes or pigments and conjugated Polymer-based door knife organic light emitting diode (Ploymer Light Emitti Diode, PLED). High-molecular organic light-emitting diodes (PLEDs) have received increasing attention due to their thinness, shortness, and wide-viewing advantages, and because their manufacturing process does not require expensive vacuum packaging, with a simple structure of 70 pieces, and fast organic film processing speeds, etc. 丨Therefore, it will have different applications from small molecule organic light emitting diodes (OLEDs). However, due to the limitations of the material properties of polymer organic light emitting layers of polymer organic light emitting diodes (PLEDs), polymer organic light emitting diodes Polar bodies (PLEDj elements need to use solution coating or inkjet printing processes, but when the solution of another layer of horse molecules is coated on an existing polymer film, the original polymer film will be damaged by the solvent, so The conventional PLED manufacturing method cannot be like a small molecule organic light emitting diode (0LED) element. An electron transport layer is formed between the light emitting layer and the cathode. The electron transport layer can be used to increase the electron injection efficiency to improve the luminous efficiency. ^ Therefore 'The conventional PLED structure, which lacks water-soluble electron transport layer materials, can be formed between the polymer organic light-emitting layer and the cathode, making current polymer materials mostly belong to The hole transmission properties, and therefore the current polymer organic light-emitting diode (PLED) elements all form a cathode layer on the polymer organic light-emitting layer, so the polymer organic light-emitting diode (PLED) elements of the holes and electrons The injection balance is less easily adjusted by making a multilayer component structure, resulting in

Page 6 l22〇64〇 Amendment No. 92113668_Year Month Day 5. Description of the invention (3) The luminous efficiency of polymer organic light emitting diode (PLED) elements is not good. [Summary of the Invention] 爰 Yes, the main Θ of the present invention is to solve the above-mentioned deficiencies, so as to avoid the existence of the deficiencies. In the present invention, the polymer optical layer is made on the element by a thermal cross-linking process. The subsequent polymer layer material is not damaged by the solvent, and the electron transport material can be coated on the light emitting ^. The electron transport layer can increase the electron injection and transmission efficiency, and return the electrons of the molecular organic light emitting diode (PLED) element. Injecting 2 i with holes to increase the luminous efficiency of high-molecular organic light-emitting diode (PLED) elements. A transparent conductive substrate is used to guide the substrate to create a water-soluble hole-transport layer. On the above light-emitting layer, a metal cathode layer is fabricated for the above-mentioned electron transmission.]: The polymer light-emitting layer is broken by a thermal cross-linking process on the main surface: on the light-emitting layer on the top, and finally the metal cathode is steamed. Layer on the above-mentioned electron transport layer, and then encapsulated with the hole transfer wheel layer and the light-emitting layer disk for electronic transmission4, a dagger can be paid. [Embodiment] As detailed in the detailed description and technical aspects of the invention &, we will now cooperate with the illustration on page 7 1220640 Description of the invention (4), binding: shown in Figure _2 ", is the manufacturing process of the present invention; organic 'Duo-: Figure 7 ^: The present invention is a polymer light-emitting layer 30 of a cross-linked light-emitting layer Produced by ::: 方: 系; Overheated cross-linking process will be high ^ 丨 pw-μ pieces are known because of polymer organic light-emitting diodes. You need to use a solution coating or inkjet printing process. When the existing polymer film is on, the original high score is 2 :::: So the current polymer organic light-emitting diode (=: Λ transmission layer 40, the present invention uses two molecules to emit light after undergoing a thermal crosslinking process The material of the layer 30 is not damaged by the solvent. The electron transporting material can be coated on the light-emitting layer 30. Finally, the metal cathode layer 50 is evaporated on the above-mentioned electron transporting layer 40. After the encapsulation process, a layer containing electricity can be obtained. High-molecular organic light emitting of the hole transport layer 20, the light emitting layer 30 and the electron transport layer 40 Element 'The manufacturing process of the polymer organic light emitting element includes: a) taking a conductive substrate 10 on which a patterned anode transparent conductive layer is arranged on a substrate, wherein the transparent conductive layer is indium tin-oxygen Those who bond organic functional groups today. The conductive layer has b) a water-soluble hole transport layer 20 is formed on the conductive substrate. c) Fabricate an oil-soluble light-emitting layer 30 material on the hole transport layer 20 above, where the light-emitting layer 30 is a polyfluorene polymer containing a side chain substitution group (

Poly_Fluorene) 7Γ conjugated polymer material, the side chain substitution group is selected from ethylene oxide, propylene oxide and methyl acrylic group. d) heating the cross-linked light-emitting layer 30 material, wherein the temperature of the thermal cross-linking process is 100 ° C to 150 ° C, which is adjusted according to the light-emitting layer 30 material, because this method can break through the conventional high Molecular organic light emitting diode (PLED) element structure Page 8 1220640

A polymer electron transport layer 40 can be fabricated on the light emitting layer 30, which can help. The electron injection properties of the device have improved the electronic transmission efficiency of the device to a certain extent. e) An electron-transporting layer 40 is formed on the light-emitting layer 30. ^ f) Fabricating a metal cathode layer 50 on the above-mentioned electron transport layer 40, wherein the cathode layer 50 comprises a calcium (Ca) layer and an aluminum metal layer on the calcium (Ca) layer. The figure below is a schematic diagram of the structure of the polymer organic light emitting device of the present invention, as shown in the figure. The present invention firstly makes a conductive substrate, and the 04 conductive substrate 10 is a substrate with a patterned anode. The transparent conductive layer is a hole-transporting layer 20 on the above-mentioned conductive substrate and a light-emitting layer 30 on the hole-transporting layer 20. The material of the light-emitting layer 30 is then subjected to a thermal crosslinking process. The temperature of the thermal cross-linking process is 100 ° C to 150 ° C, which is adjusted according to the material of the light-emitting layer 30. Since the material of the light-emitting layer 30 of the south knife after the thermal cross-linking process is not damaged by the solvent, An electron-transporting material can be coated on the light-emitting layer 30, so an electron-transporting layer 40 is disposed on the above-mentioned light-emitting layer 30, and a cathode layer 50 is finally disposed on the above-mentioned electron-transporting layer 40. After the packaging process is performed, To obtain a hole-transporting layer 20 Polymer organic light-emitting diode (PLED) of 30 and electron-transporting layer 40 also has an electron-transporting layer 40 between light-emitting layer 30 and cathode layer 50, which is a breakthrough of the conventional polymer organic light-emitting diodes. The polar body (pLED) element structure can be used to fabricate a high-molecular electron transport layer 40 on top of the light-emitting layer 40, y to help improve the electron injection properties of the το element, and to substantially improve the electron transmission efficiency of the device. This electron transport layer 40 is used to increase electricity

Page 9 1220640 _Case No. 92113668_ Year Month Day__ V. Description of the invention (6) The sub-injection rate and transmission efficiency can reduce the driving voltage of polymer organic light emitting diode (PLED) devices and increase the service life of the devices . However, the above are only the preferred embodiments of the present invention. When the scope of implementation of the present invention cannot be limited, that is, all equal changes and modifications made in accordance with the scope of the patent application of the present invention shall still belong to the patent of the present invention. Covered.

Page 10 1220640 _Case No. 92113668_ Year Month Amendment _ Brief Description [Schematic Illustration] Figure 1 is a schematic diagram of the manufacturing process of the present invention. Figure 2 is a schematic diagram of the polymer organic light-emitting device of the present invention. [Illustration of symbols in the figure] Patterned conductive substrate ............ a A hole transmission layer is provided on the conductive substrate ........ b A light-emitting layer material is provided on the substrate. On the hole transport layer ... c Thermally cross-linked light-emitting layer material ......... d Setting an electron transport layer on the light-emitting layer ... e Fabricate a metal cathode layer on the electron transport layer ... f conductive substrate ... 10 hole transport layer ... 20 Light-emitting layer ......... 30 Electron-transport layer ... 40 Cathode layer ... ....... 50

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Claims (1)

1220640 _ Case No. 92mfifis Patent Application Law, Oxidazole 5? The light-emitting layer of the fluorene molecular organic light-emitting device is made by Yu Jing: =: = Cheng will make the polymer light-emitting layer on the device. Based on the above ::: == on the light-emitting layer, after the final vapor-deposited gold cathode contains an electric layer, and after the encapsulation process, $ get an electric = polymer organic light-emitting layer of the transport layer, the light-emitting layer and the electron transport layer + 'This The manufacturing steps of the two-molecule organic light-emitting element include the following steps: The electric substrate is a conductive transparent substrate with a solidified anode disposed on the substrate, and a water-soluble hole-transporting layer is provided on the conductive substrate. ； / Yong / combined light-emitting layer material on the hole transport layer; d) heating cross-linked light-emitting layer material; e) 1 as an electron transport layer on the light-emitting layer; f) making a metal cathode layer on the above Electron transport layer. In the method for manufacturing a polymer 2 light-emitting element having a cross-linked light-emitting layer as described in the first item of the scope of the applied patent ', the transparent conductive layer is a bond having an indium tin-oxygen-silicon-organic functional group. 3, Gudi 3 discusses the application of the polymer B of the cross-linked light-emitting layer described in item 1 of the patent scope: Manufacture method of the light-emitting layer, in which the light-emitting layer is-selected from the group consisting of epoxy resin and% oxypropane. And 7Γ conjugated polymer materials with side chain substituted groups in fluorenyl acrylic. Same as 4. The method for manufacturing a polymer organic light-emitting element with a cross-linked light-emitting layer as described in item 苐 .i of the scope of patent application, wherein the temperature of the thermal cross-linking process is from 2 0 0 C to 1 50 0: The material of the light emitting layer is adjusted. ', Amendment No. 92113668 VI. Patent application scope right, 5, t. Patent application scope 帛 1 The method for manufacturing a polymer f machine light-emitting element with a cross-linked light emitting layer, wherein the cathode layer includes 4 layers, and An aluminum metal layer on a calcium layer. 6. —A polymer organic light-emitting element with a cross-linked light-emitting layer, the element is composed of: a conductive substrate, the conductive substrate is a transparent conductive layer with a patterned anode disposed on the substrate; Hole transport layer; ^ a light-emitting layer on the hole transport layer, the light-emitting layer undergoes a thermal coupling process, and the temperature of the thermal cross-linking process ranges from 丨 〇〇 ～ 丨 〇。 It depends on the material of the luminescent layer Make adjustments; an electron transport layer on the light emitting layer; a cathode layer on the electron transport layer.