WO2021120299A1 - 用于喷墨打印有机发光二极管的墨水组合物及其制造方法 - Google Patents

用于喷墨打印有机发光二极管的墨水组合物及其制造方法 Download PDF

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WO2021120299A1
WO2021120299A1 PCT/CN2019/129159 CN2019129159W WO2021120299A1 WO 2021120299 A1 WO2021120299 A1 WO 2021120299A1 CN 2019129159 W CN2019129159 W CN 2019129159W WO 2021120299 A1 WO2021120299 A1 WO 2021120299A1
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Prior art keywords
ink composition
group
component
bipolar
host material
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PCT/CN2019/129159
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English (en)
French (fr)
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李祥龙
孟鸿
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深圳市华星光电半导体显示技术有限公司
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Priority to US16/649,999 priority Critical patent/US11441045B2/en
Publication of WO2021120299A1 publication Critical patent/WO2021120299A1/zh

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    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D11/00—Inks
    • C09D11/30—Inkjet printing inks
    • C09D11/38—Inkjet printing inks characterised by non-macromolecular additives other than solvents, pigments or dyes
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D11/00—Inks
    • C09D11/30—Inkjet printing inks
    • C09D11/36—Inkjet printing inks based on non-aqueous solvents
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K71/00—Manufacture or treatment specially adapted for the organic devices covered by this subclass
    • H10K71/10—Deposition of organic active material
    • H10K71/12—Deposition of organic active material using liquid deposition, e.g. spin coating
    • H10K71/13—Deposition of organic active material using liquid deposition, e.g. spin coating using printing techniques, e.g. ink-jet printing or screen printing
    • H10K71/135—Deposition of organic active material using liquid deposition, e.g. spin coating using printing techniques, e.g. ink-jet printing or screen printing using ink-jet printing
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K85/00—Organic materials used in the body or electrodes of devices covered by this subclass
    • H10K85/10—Organic polymers or oligomers
    • H10K85/141—Organic polymers or oligomers comprising aliphatic or olefinic chains, e.g. poly N-vinylcarbazol, PVC or PTFE
    • H10K85/146—Organic polymers or oligomers comprising aliphatic or olefinic chains, e.g. poly N-vinylcarbazol, PVC or PTFE poly N-vinylcarbazol; Derivatives thereof
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K85/00—Organic materials used in the body or electrodes of devices covered by this subclass
    • H10K85/60—Organic compounds having low molecular weight
    • H10K85/631—Amine compounds having at least two aryl rest on at least one amine-nitrogen atom, e.g. triphenylamine
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K85/00—Organic materials used in the body or electrodes of devices covered by this subclass
    • H10K85/60—Organic compounds having low molecular weight
    • H10K85/631—Amine compounds having at least two aryl rest on at least one amine-nitrogen atom, e.g. triphenylamine
    • H10K85/633—Amine compounds having at least two aryl rest on at least one amine-nitrogen atom, e.g. triphenylamine comprising polycyclic condensed aromatic hydrocarbons as substituents on the nitrogen atom
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K85/00—Organic materials used in the body or electrodes of devices covered by this subclass
    • H10K85/60—Organic compounds having low molecular weight
    • H10K85/649—Aromatic compounds comprising a hetero atom
    • H10K85/654—Aromatic compounds comprising a hetero atom comprising only nitrogen as heteroatom
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K85/00—Organic materials used in the body or electrodes of devices covered by this subclass
    • H10K85/60—Organic compounds having low molecular weight
    • H10K85/649—Aromatic compounds comprising a hetero atom
    • H10K85/656—Aromatic compounds comprising a hetero atom comprising two or more different heteroatoms per ring
    • H10K85/6565—Oxadiazole compounds
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K85/00—Organic materials used in the body or electrodes of devices covered by this subclass
    • H10K85/60—Organic compounds having low molecular weight
    • H10K85/649—Aromatic compounds comprising a hetero atom
    • H10K85/657—Polycyclic condensed heteroaromatic hydrocarbons
    • H10K85/6572—Polycyclic condensed heteroaromatic hydrocarbons comprising only nitrogen in the heteroaromatic polycondensed ring system, e.g. phenanthroline or carbazole

Definitions

  • the present invention relates to an ink composition and a manufacturing method thereof, in particular to an ink composition for inkjet printing of organic light-emitting diodes and a manufacturing method thereof.
  • the basic structure of an Organic Light Emitting Diode includes an anode, an organic functional layer, and a cathode sequentially formed on a substrate.
  • the organic functional layer mainly includes a hole injection layer, a hole transport layer, a light-emitting layer, an electron transport layer, and an electron injection layer sequentially arranged on the anode.
  • the manufacturing method of the organic light emitting diode includes an evaporation method and a solution method.
  • the evaporation method mainly uses the principle of thermal evaporation of organic materials, that is, the organic materials are heated in a vacuum. Depending on the material characteristics, some materials will first liquefy and then vaporize, and some will directly sublimate, and then diffuse outward at a certain initial rate. And move to the surface of indium tin oxide, and form a thin film after cooling and depositing.
  • the solution method the inkjet printing method is included, in which materials with required functions are sprayed on the substrate through the print head.
  • the solution method has many advantages such as high material utilization rate, simple device manufacturing, large-area processing and manufacturing, no need for fine masks, and low cost. Therefore, it has attracted great interest in scientific research and industry.
  • Organic light-emitting diodes manufactured by inkjet printing usually also need to have a hole injection layer, a hole transport layer, a light emitting layer and an electron transport layer, and multiple functional layers are not only insoluble with each other, but also need to have an excellent combination Performance, thus increasing the difficulty of ink development in inkjet printing.
  • simplification of the structure of the organic light emitting diode is currently a development goal, and the key point is the preparation of the ink. In other words, the development of ink will directly determine the development of simplification of the structure of organic light-emitting diodes.
  • the purpose of the present invention is to provide an ink composition for inkjet printing of organic light-emitting diodes and a manufacturing method thereof.
  • the organic light-emitting diode manufactured by ink-jet printing of the ink composition does not require special hole and electron transport. Layer to simplify the structure of the organic light emitting diode.
  • an embodiment of the present invention provides an ink composition for inkjet printing of organic light-emitting diodes, wherein the ink composition comprises, by weight percentage: a bipolar light-emitting component 20% , Solvent 70%, surface tension regulator 2% and viscosity regulator 2%.
  • the bipolar luminescent component is a single-component luminescent material selected from the group consisting of fluorescence, phosphorescence, thermally activated delayed fluorescence, room temperature phosphorescence, aggregation induced delayed fluorescence, free radicals, A group consisting of quantum dots, excited ground state complexes, and excited complexes.
  • the bipolar luminescent component is a multi-component luminescent material, including a luminescent material and a host material, and the luminescent material is selected from the group consisting of fluorescence, phosphorescence, and thermal activation retardation.
  • the single-component bipolar host material is selected from the group consisting of CBP, 26DczPPy and 35DczPPy;
  • the multi-component bipolar host material is selected from the group consisting of TCTA/26DczPPy, mCP/B3PyMPM, PVK/OXD-7, TCTA/B3PyMPM, m-MTDATA/OXD-7 and NPB/PO-T2T.
  • the solvent includes alkane or aromatic hydrocarbon compounds, alcohol compounds and high boiling point solvents.
  • the high boiling point solvent is selected from the group consisting of ether compounds, ester compounds and aromatic compounds.
  • the surface tension modifier is selected from one or more of the group consisting of a co-solvent and a surfactant.
  • the surface tension modifier is selected from one or more of the group consisting of imidazole and its derivatives, phenol and hydroquinone.
  • the viscosity modifier is selected from one or more of the group consisting of alcohols, ethers, esters, phenols and amines.
  • another embodiment of the present invention provides an ink composition for inkjet printing of organic light-emitting diodes, wherein the ink composition comprises, by weight percentage: a bipolar luminescent component 0.01 -40%, solvent 10-99.9%, surface tension regulator 0.01-5% and viscosity regulator 0.01-5%.
  • the bipolar luminescent component is a single-component luminescent material selected from the group consisting of fluorescence, phosphorescence, thermally activated delayed fluorescence, room temperature phosphorescence, aggregation induced delayed fluorescence, free radicals, A group consisting of quantum dots, excited ground state complexes, and excited complexes.
  • the bipolar luminescent component is a multi-component luminescent material, including a luminescent material and a host material, and the luminescent material is selected from the group consisting of fluorescence, phosphorescence, and thermal activation retardation.
  • the single-component bipolar host material is selected from the group consisting of CBP, 26DczPPy and 35DczPPy;
  • the multi-component bipolar host material is selected from the group consisting of TCTA/26DczPPy, mCP/B3PyMPM, PVK/OXD-7, TCTA/B3PyMPM, m-MTDATA/OXD-7 and NPB/PO-T2T.
  • the solvent includes alkane or aromatic hydrocarbon compounds, alcohol compounds and high boiling point solvents.
  • the high boiling point solvent is selected from the group consisting of ether compounds, ester compounds and aromatic compounds.
  • the surface tension modifier is selected from one or more of the group consisting of a co-solvent and a surfactant.
  • the surface tension modifier is selected from one or more of the group consisting of imidazole and its derivatives, phenol and hydroquinone.
  • the viscosity modifier is selected from one or more of the group consisting of alcohols, ethers, esters, phenols and amines.
  • another embodiment of the present invention provides a manufacturing method for manufacturing the above-mentioned ink composition, wherein the manufacturing method includes the step of dispersing the bipolar light-emitting component in the solvent to obtain a precursor And under stirring, adding the viscosity modifier and the surface tension modifier to the pre-prepared composition to obtain the ink composition.
  • the ink composition of the present invention uses the bipolar light-emitting component and its combination with other components and the specific ratio between them, so that the organic light-emitting diode manufactured by inkjet printing does not need to be installed.
  • Special hole and electron transport layer to simplify the structure of organic light emitting diode.
  • an ink composition for ink-jet printing organic light-emitting diodes by weight percentage, comprises: 0.01-40% bipolar light-emitting component, 10-99.9% solvent, and surface tension regulator 0.01-5% and viscosity modifier 0.01-5%.
  • the content of each component in the ink composition of the present invention is not limited to this. In other embodiments, the content of the multiple components may be different.
  • the bipolar luminescent component is 5-30%, 10-20%, or 20-30%; the solvent is 20-80%, 30-70%, or 40-60%; the surface tension modifier 0.1-1%, 1-4%, 2-3% or 2.5-3%; and viscosity modifier 0.1-1%, 1-4%, 2-3% or 2.5-3%.
  • the bipolar luminescent component is used to adjust the light color of different wavelength bands, the balance of bipolar carriers, and the luminous efficiency.
  • the luminescent material whose bipolar luminescent component is a single component can be selected from the group consisting of fluorescence, phosphorescence, thermally activated delayed fluorescence, room temperature phosphorescence, aggregation induced delayed fluorescence, free radicals, quantum dots, and excited state ground states.
  • the luminescent material of the bipolar luminescent component of the multi-component luminescent material may include a luminescent material and a host material, and the luminescent material is selected from the group consisting of fluorescence, phosphorescence, thermally activated delayed fluorescence, room temperature phosphorescence, and aggregation induced A group consisting of delayed fluorescence, free radicals, quantum dots, excited ground state complexes, and excited complexes.
  • the host material is selected from a single-component bipolar host material or a multi-component bipolar host material.
  • the single-component bipolar host material is selected from the group consisting of CBP, 26DczPPy and 35DczPPy
  • the multi-component bipolar host material is selected from the group consisting of TCTA/26DczPPy, mCP/B3PyMPM, PVK/OXD-7, TCTA/B3PyMPM, m-MTDATA/OXD-7, and NPB/PO-T2T are a group of materials that mainly transport electrons and holes.
  • the solvent can be an organic solvent or an inorganic solvent, which is used to dissolve and disperse the bipolar luminescent component, while adjusting the physical properties of the solution to meet the requirements of solution processing.
  • the solvent includes alkane or aromatic hydrocarbon compounds, alcohol compounds and high boiling point solvents.
  • the alcohol compound may be a monohydric alcohol or a polyhydric alcohol.
  • the high boiling point of the high boiling point solvent means greater than 160°C, and may be selected from the group consisting of ether compounds, ester compounds and aromatic compounds.
  • the surface tension regulator is used to adjust the surface tension to meet the requirements of inkjet printing.
  • the target range of the surface tension of the surface tension regulator is 25-40 mN/m, and is selected from one or more of the group consisting of a co-solvent and a surfactant.
  • the surface tension modifier is selected from one or more of the group consisting of imidazole and its derivatives, phenol and hydroquinone.
  • the viscosity of the viscosity modifier is used to adjust the viscosity to meet the requirements of inkjet printing.
  • the target range of the viscosity modifier is 3-12 cP, and is selected from one or more of the group consisting of alcohols, ethers, esters, phenols and amines.
  • a method for manufacturing an ink composition for inkjet printing of organic light-emitting diodes is used to manufacture the aforementioned ink composition, including the step of dispersing the bipolar light-emitting component in the solvent In order to obtain a pre-prepared composition; and under stirring, adding the viscosity modifier and the surface tension modifier to the pre-prepared composition to obtain the ink composition.
  • the bipolar light-emitting component is first dispersed in 70 wt% of the solvent to obtain a pre-prepared composition. Then, under stirring, 2 wt% of the viscosity regulator and 2 wt% of the surface tension regulator are added to the pre-prepared composition to obtain an ink composition.
  • the ink composition of the present invention through the bipolar light-emitting component and its combination with other components, and the specific ratio between them, so that the organic light-emitting diode manufactured by inkjet printing does not need to be equipped with special The hole and electron transport layer, thereby simplifying the structure of the organic light emitting diode.
  • method refers to the methods, means, techniques and procedures used to accomplish a specific task, including but not limited to those methods, means, techniques and procedures, which are known or have been Knowing methods, methods, techniques or procedures are easily developed by practitioners in the fields of chemistry, pharmacology, biology, biochemistry, and medicine.
  • the "%” mentioned above in the present invention refers to "weight percentage (wt%)" unless otherwise specified; the numerical range (such as 10% to 15% of A) includes the above, unless otherwise specified.
  • the lower limit ie 10% ⁇ A ⁇ 15%) and all the numerical points in the range (such as 11, 12, 13, 14...); if the numerical range does not define the lower limit (such as less than 0.2% of B, Or less than 0.2% of B), it means that its lower limit may be 0 (that is, 0% ⁇ B ⁇ 0.2%).

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Wood Science & Technology (AREA)
  • Organic Chemistry (AREA)
  • Manufacturing & Machinery (AREA)
  • Inks, Pencil-Leads, Or Crayons (AREA)

Abstract

本发明公开一种用于喷墨打印有机发光二极管的墨水组合物及其制造方法，所述墨水组合物按重量百分比计包含双极性发光组分0.01-40 %、溶剂10-99.9 %、表面张力调节剂0.01-5 %及粘度调节剂0.01-5 %。所述墨水组合物的制造方法包含步骤：先将所述双极性发光组分分散于所述溶剂中，接着于搅拌下加入所述表面张力调节剂及所述粘度调节剂以获得所述墨水组合物。本发明的墨水组合物使得喷墨打印制得的有机发光二极管不需要设置专门的空穴及电子传输层，因此能简化有机发光二极管的结构，并兼具合适的黏度、表面张力及挥发性能。

Description

用于喷墨打印有机发光二极管的墨水组合物及其制造方法 技术领域
本发明是有关于一种墨水组合物及其制造方法，特别是有关于一种用于喷墨打印有机发光二极管的墨水组合物及其制造方法。
 背景技术
有机发光二极管（Organic Light Emitting Diode, OLED）的基本结构包括依序形成在基板上的阳极、有机功能层及阴极。有机功能层主要包括依序设置于阳极上的空穴注入层、空穴传输层、发光层、电子传输层及电子注入层。当电力供应至适当的电压时，阳极的空穴及阴极的电荷会在发光层中结合而发光，并依其配方的不同产生红、绿及蓝RGB三原色，构成基本色彩。
有机发光二极管的制造方法包括蒸镀方法及溶液方法。蒸镀方法主要是利用热蒸发有机材料的原理，即将有机材料在真空下加热，依材料特性不同，有些材料会先液化再气化，有些则直接升华，接着以一定的初始速率向外扩散，并运动到铟锡氧化物的表面，经冷却沉积下来形成一层薄膜。而在溶液法中，包括喷墨打印法，其通过打印头将所需功能的材料分别喷涂在基底上。相较于蒸镀方法，溶液方法具有材料利用率高、器件制造简单、可大面积加工制造、不需要精细掩膜板及低成本等诸多优点，因而引起科研界及工业界的浓厚兴趣。
以喷墨打印法制造的有机发光二极管通常也需具有空穴注入层、空穴传输层、发光层及电子传输层，且多个功能层之间彼此不仅不能相互溶解，还需具备优良的组合性能表现，因而提高喷墨打印法中的墨水的开发难度。此外，目前将有机发光二极管的结构予以简单化是一开发目标，而其关键点在于墨水的配制。也就是说，墨水的进展将直接决定将有机发光二极管的结构简单化的发展。
 技术问题
本发明的目的在于提供一种用于喷墨打印有机发光二极管的墨水组合物及其制造方法，所述墨水组合物通过喷墨打印制造出的有机发光二极管不需要设置专门的空穴及电子传输层，以简化有机发光二极管的结构。
 技术解决方案
为达成本发明的前述目的，本发明的一实施例提供一种用于喷墨打印有机发光二极管的墨水组合物，其中所述墨水组合物按重量百分比计包含：双极性发光组分20 %、溶剂70 %、表面张力调节剂2 %及粘度调节剂2 %。
在本发明的一实施例中，所述双极性发光组分是一单一组分的发光材料，选自于由荧光、磷光、热活化延迟荧光、室温磷光、聚集诱导延迟荧光、自由基、量子点、激态基态复合物及激发错合体所组成的群组。
在本发明的一实施例中，所述双极性发光组分是一多组分的发光材料，包括一发光材料及一主体材料，所述发光材料选自于由荧光、磷光、热活化延迟荧光、室温磷光、聚集诱导延迟荧光、自由基、量子点、激态基态复合物及激发错合体所组成的群组；以及所述主体材料选自一单一组分的双极性主体材料或一多组分的双极性主体材料。
在本发明的一实施例中，所述单一组分的双极性主体材料选自于由CBP、26DczPPy及35DczPPy所组成的群组；所述多组分的双极性主体材料选自于由TCTA/26DczPPy、mCP/B3PyMPM、PVK/OXD-7、TCTA/B3PyMPM、m-MTDATA/OXD-7及NPB/PO-T2T所组成的群组。
在本发明的一实施例中，所述溶剂包括烷烃或芳香烃化合物、醇类化合物及高沸点溶剂。
在本发明的一实施例中，所述高沸点溶剂选自于由醚类化合物、酯类化合物及芳香类化合物所组成的群组。
在本发明的一实施例中，所述表面张力调节剂选自于由共溶剂及表面活性剂所组成的群组中的一个或多个。
在本发明的一实施例中，所述表面张力调节剂选自于咪唑及其衍生物、苯酚及对苯二酚所组成的群组中的一个或多个。
在本发明的一实施例中，所述粘度调节剂选自于由醇、醚、酯、酚及胺所组成的群组中的一个或多个。
为达成本发明的前述目的，本发明的又一实施例提供一种用于喷墨打印有机发光二极管的墨水组合物，其中所述墨水组合物按重量百分比计包含：双极性发光组分0.01-40 %、溶剂10-99.9 %、表面张力调节剂0.01-5 %及粘度调节剂0.01-5 %。
在本发明的一实施例中，所述双极性发光组分是一单一组分的发光材料，选自于由荧光、磷光、热活化延迟荧光、室温磷光、聚集诱导延迟荧光、自由基、量子点、激态基态复合物及激发错合体所组成的群组。
在本发明的一实施例中，所述双极性发光组分是一多组分的发光材料，包括一发光材料及一主体材料，所述发光材料选自于由荧光、磷光、热活化延迟荧光、室温磷光、聚集诱导延迟荧光、自由基、量子点、激态基态复合物及激发错合体所组成的群组；以及所述主体材料选自一单一组分的双极性主体材料或一多组分的双极性主体材料。
在本发明的一实施例中，所述单一组分的双极性主体材料选自于由CBP、26DczPPy及35DczPPy所组成的群组；所述多组分的双极性主体材料选自于由TCTA/26DczPPy、mCP/B3PyMPM、PVK/OXD-7、TCTA/B3PyMPM、m-MTDATA/OXD-7及NPB/PO-T2T所组成的群组。
在本发明的一实施例中，所述溶剂包括烷烃或芳香烃化合物、醇类化合物及高沸点溶剂。
在本发明的一实施例中，所述高沸点溶剂选自于由醚类化合物、酯类化合物及芳香类化合物所组成的群组。
在本发明的一实施例中，所述表面张力调节剂选自于由共溶剂及表面活性剂所组成的群组中的一个或多个。
在本发明的一实施例中，所述表面张力调节剂选自于咪唑及其衍生物、苯酚及对苯二酚所组成的群组中的一个或多个。
在本发明的一实施例中，所述粘度调节剂选自于由醇、醚、酯、酚及胺所组成的群组中的一个或多个。
再者，本发明的另一实施例提供一种制造上述墨水组合物的制造方法，其中所述制造方法包含步骤：将所述双极性发光组分分散于所述溶剂中，以获得一前制组合物；以及在搅拌下，将所述黏度调节剂及所述表面张力调节剂加入于所述前制组合物中，以获得所述墨水组合物。
 有益效果
与现有技术相比较，本发明的墨水组合物通过双极性发光组分以及其与其他组分的结合及其之间的特定比例，使得通过喷墨打印制造出的有机发光二极管不需要设置专门的空穴及电子传输层，藉此简化有机发光二极管的结构。
 本发明的实施方式
应当理解，本文所描述的具体实施方式仅仅用以解释本发明，并不用于限定本发明。
根据本发明的一实施例的一用于喷墨打印有机发光二极管的墨水组合物，按重量百分比计，包含：双极性发光组分0.01-40 %、溶剂10-99.9 %、表面张力调节剂0.01-5 %及粘度调节剂0.01-5 %。当然，本发明的墨水组合物中的各个组分的含量不以此为限。在其他实施例中，所述多个组分的含量可有所不同。例如，按重量百分比计，双极性发光组分为5-30 %、10-20 %或20-30 %；溶剂为20-80 %、30-70 %或40-60 %；表面张力调节剂0.1-1 %、1-4 %、2-3 %或2.5-3 %；以及粘度调节剂0.1-1 %、1-4 %、2-3 %或2.5-3 %。
详细而言，所述双极性发光组分用来实现不同波段的发光光色调节、双极性载流子平衡及发光效率的调节，并且可以是单一组分的发光材料，也可以是多种材料混合而成的具有双极性功能的混合物材料。具体而言，所述双极性发光组分为单一组分的发光材料可以选自于由荧光、磷光、热活化延迟荧光、室温磷光、聚集诱导延迟荧光、自由基、量子点、激态基态复合物（excimer）及激发错合体（exciplex）所组成的群组。所述双极性发光组分为多组分的发光材料的发光材料可以包括一发光材料及一主体材料，所述发光材料选自于由荧光、磷光、热活化延迟荧光、室温磷光、聚集诱导延迟荧光、自由基、量子点、激态基态复合物及激发错合体所组成的群组。所述主体材料选自一单一组分的双极性主体材料或一多组分的双极性主体材料。详细而言，所述单一组分的双极性主体材料选自于由CBP、26DczPPy及35DczPPy所组成的群组，而所述多组分的双极性主体材料选自于由TCTA/26DczPPy、mCP/B3PyMPM、PVK/OXD-7、TCTA/B3PyMPM、m-MTDATA/OXD-7及NPB/PO-T2T等为代表的电子传输为主及空穴传输为主的材料所组成的群组。
所述溶剂可为有机溶剂或为无机溶剂，用于溶解及分散双极性发光组分，同时调节溶液的物理性质，使其满足溶液加工的需求。所述溶剂包括烷烃或芳香烃化合物、醇类化合物及高沸点溶剂。详细而言，在本实施例中，醇类化合物可以是一元醇或是多元醇。所述高沸点溶剂的高沸点是指大于160°C，并可选自于由醚类化合物、酯类化合物及芳香类化合物所组成的群组。
所述表面张力调节剂用于调节表面张力，使其满足喷墨打印的需求。所述表面张力调节剂的表面张力的目标范围为25-40 mN/m，并选自于由共溶剂及表面活性剂所组成的群组中的一个或多个。具体而言，所述表面张力调节剂选自于咪唑及其衍生物、苯酚及对苯二酚所组成的群组中的一个或多个。
所述粘度调节剂的黏度用于调节黏度，使其满足喷墨打印的需求。所述粘度调节剂的目标范围为3-12 cP，并选自于由醇、醚、酯、酚及胺所组成的群组中的一个或多个。
根据本发明的一实施例的用于喷墨打印有机发光二极管的墨水组合物的制造方法，用于制造前述的墨水组合物，包括步骤：将所述双极性发光组分分散于所述溶剂中，以获得一前制组合物；以及在搅拌下，将所述黏度调节剂及所述表面张力调节剂加入于所述前制组合物中，以获得所述墨水组合物。
详细而言，在本实施例中，先将约20 wt%的所述双极性发光组分分散于70 wt%的所述溶剂中，以获得一前制组合物。接着，在搅拌下，将2 wt%的所述黏度调节剂及2 wt%的所述表面张力调节剂加入于所述前制组合物中，以获得一墨水组合物。
如上所述，本发明的墨水组合物通过双极性发光组分以及其与其他组分的结合及其之间的特定比例，使得通过喷墨打印制造出的有机发光二极管中不需要设置专门的空穴及电子传输层，藉此简化有机发光二极管的结构。
本文所使用的单数形式“一”、“一个”及“至少一”包括复数引用，除非上下文另有明确规定。例如，术语“一组合物”或“至少一种组合物”可以包括多个化合物，包括其混合物。
如本文所用的术语“方法”指的是用于完成一特定任务的方式、手段、技术及程序，包括但不限于，那些方式、手段、技术及程序，其是已知的，或是从已知的方式、手段、技术或程序很容易地被化学、药理、生物、生化及医学领域从业者所开发。
值得注意的是，本发明上文提及的“%”若无特定说明皆指“重量百分比（wt%）”；数值范围（如10%~15%的A）若无特定说明皆包含上、下限值（即10%≦A≦15%）及范围中的所有数值点（如11、12、13、14……）；数值范围若未界定下限值（如低于0.2%的B，或0.2%以下的B），则皆指其下限值可能为0（即0%≦B≦0.2%）。
本发明已由上述相关实施例加以描述，然而上述实施例仅为实施本发明的范例。必需指出的是，已公开的实施例并未限制本发明的范围。相反地，包含于权利要求书的精神及范围的修改及均等设置均包括于本发明的范围内。

Claims (19)

  1. 一种用于喷墨打印有机发光二极管的墨水组合物，按重量百分比计，其包含：双极性发光组分20 %、溶剂70%、表面张力调节剂2 %及粘度调节剂2 %。
  2. 如权利要求1所述的墨水组合物，其中所述双极性发光组分是一单一组分的发光材料，选自于由荧光、磷光、热活化延迟荧光、室温磷光、聚集诱导延迟荧光、自由基、量子点、激态基态复合物及激发错合体所组成的群组。
  3. 如权利要求1所述的墨水组合物，其中所述双极性发光组分是一多组分的发光材料，包括一发光材料及一主体材料，所述发光材料选自于由荧光、磷光、热活化延迟荧光、室温磷光、聚集诱导延迟荧光、自由基、量子点、激态基态复合物及激发错合体所组成的群组；以及所述主体材料选自一单一组分的双极性主体材料或一多组分的双极性主体材料。
  4. 如权利要求3所述的墨水组合物，其中所述单一组分的双极性主体材料选自于由CBP、26DczPPy及35DczPPy所组成的群组；所述多组分的双极性主体材料选自于由TCTA/26DczPPy、mCP/B3PyMPM、PVK/OXD-7、TCTA/B3PyMPM、m-MTDATA/OXD-7及NPB/PO-T2T所组成的群组。
  5. 如权利要求1所述的墨水组合物，其中所述溶剂包括烷烃或芳香烃化合物、醇类化合物及高沸点溶剂。
  6. 如权利要求5所述的墨水组合物，其中所述高沸点溶剂选自于由醚类化合物、酯类化合物及芳香类化合物所组成的群组。
  7. 如权利要求1所述的墨水组合物，其中所述表面张力调节剂选自于由共溶剂及表面活性剂所组成的群组中的一个或多个。
  8. 如权利要求1所述的墨水组合物，其中所述表面张力调节剂选自于咪唑及其衍生物、苯酚及对苯二酚所组成的群组中的一个或多个。
  9. 如权利要求1所述的墨水组合物，其中所述粘度调节剂选自于由醇、醚、酯、酚及胺所组成的群组中的一个或多个。
  10. 一种用于喷墨打印有机发光二极管的墨水组合物，按重量百分比计，其包含：双极性发光组分0.01-40 %、溶剂10-99.9 %、表面张力调节剂0.01-5 %及粘度调节剂0.01-5 %。
  11. 如权利要求10所述的墨水组合物，其中所述双极性发光组分是一单一组分的发光材料，选自于由荧光、磷光、热活化延迟荧光、室温磷光、聚集诱导延迟荧光、自由基、量子点、激态基态复合物及激发错合体所组成的群组。
  12. 如权利要求10所述的墨水组合物，其中所述双极性发光组分是一多组分的发光材料，包括一发光材料及一主体材料，所述发光材料选自于由荧光、磷光、热活化延迟荧光、室温磷光、聚集诱导延迟荧光、自由基、量子点、激态基态复合物及激发错合体所组成的群组；以及所述主体材料选自一单一组分的双极性主体材料或一多组分的双极性主体材料。
  13. 如权利要求12所述的墨水组合物，其中所述单一组分的双极性主体材料选自于由CBP、26DczPPy及35DczPPy所组成的群组；所述多组分的双极性主体材料选自于由TCTA/26DczPPy、mCP/B3PyMPM、PVK/OXD-7、TCTA/B3PyMPM、m-MTDATA/OXD-7及NPB/PO-T2T所组成的群组。
  14. 如权利要求10所述的墨水组合物，其中所述溶剂包括烷烃或芳香烃化合物、醇类化合物及高沸点溶剂。
  15. 如权利要求14所述的墨水组合物，其中所述高沸点溶剂选自于由醚类化合物、酯类化合物及芳香类化合物所组成的群组。
  16. 如权利要求10所述的墨水组合物，其中所述表面张力调节剂选自于由共溶剂及表面活性剂所组成的群组中的一个或多个。
  17. 如权利要求10所述的墨水组合物，其中所述表面张力调节剂选自于咪唑及其衍生物、苯酚及对苯二酚所组成的群组中的一个或多个。
  18. 如权利要求10所述的墨水组合物，其中所述粘度调节剂选自于由醇、醚、酯、酚及胺所组成的群组中的一个或多个。
  19. 一种如权利要求10至18任一项所述的用于喷墨打印有机发光二极管的墨水组合物的制造方法，其包含步骤：
    将所述双极性发光组分分散于所述溶剂中，以获得一前制组合物；以及
    在搅拌下，将所述黏度调节剂及所述表面张力调节剂加入于所述前制组合物中，以获得所述墨水组合物。
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