WO2015043054A1 - 有机电致发光器件及其制备方法 - Google Patents
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- WO2015043054A1 WO2015043054A1 PCT/CN2013/088247 CN2013088247W WO2015043054A1 WO 2015043054 A1 WO2015043054 A1 WO 2015043054A1 CN 2013088247 W CN2013088247 W CN 2013088247W WO 2015043054 A1 WO2015043054 A1 WO 2015043054A1
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- organic electroluminescent
- matrix material
- electroluminescent device
- nanometal particles
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Classifications
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
- H10K59/10—OLED displays
- H10K59/12—Active-matrix OLED [AMOLED] displays
- H10K59/122—Pixel-defining structures or layers, e.g. banks
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K50/00—Organic light-emitting devices
- H10K50/80—Constructional details
- H10K50/85—Arrangements for extracting light from the devices
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K50/00—Organic light-emitting devices
- H10K50/10—OLEDs or polymer light-emitting diodes [PLED]
- H10K50/11—OLEDs or polymer light-emitting diodes [PLED] characterised by the electroluminescent [EL] layers
-
- 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
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K2102/00—Constructional details relating to the organic devices covered by this subclass
- H10K2102/301—Details of OLEDs
- H10K2102/331—Nanoparticles used in non-emissive layers, e.g. in packaging layer
Definitions
- Embodiments of the present invention relate to an organic electroluminescent device and a method of fabricating the same. Background technique
- the basic structure of the organic electroluminescent device is such that one or more organic light-emitting layers are sandwiched between the two electrodes.
- the two layers of electrodes serve as the anode and cathode of the light emitting device, respectively.
- the electrode can be prepared using a metal or metal oxide material as needed. Under the action of the applied voltage, carrier electrons and holes are injected into the organic light-emitting layer from the cathode direction and the anode direction, respectively, and encounter recombination to generate excitons. The energy of the excitons is attenuated in the form of light, thereby radiating light and realizing The effect of electroluminescence.
- Embodiments of the present invention provide organic electroluminescent devices capable of improving external quantum efficiency.
- One aspect of the present invention provides an organic electroluminescent device comprising a pixel defining layer and a light emitting structure, the pixel defining layer being doped with nano metal particles.
- an isolation layer is disposed between the nano metal particles and the luminescent molecules in the light emitting structure.
- the isolation layer can be part of a pixel defining layer, or the isolation layer and the nano metal particles form a separate core-shell structure.
- the isolation layer may be composed of an insulating medium.
- the metal material in the nano metal particles may be one of gold, silver, and aluminum; or one of the respective alloys of gold, silver, and aluminum; or two of gold, silver, and aluminum or Three alloys.
- the shape of the nano metal particles may be one or more of a spherical shape, a prismatic shape, a cubic shape, and a cage shape.
- the nano metal particles may have a particle diameter of from 1 nm to 100 nm.
- Another aspect of the present invention provides a method of fabricating an organic electroluminescent device, comprising: forming a layer of a host material doped with nano metal particles on a substrate provided with an electrode; and performing the layer of the matrix material by a patterning process Processing, to obtain a pixel defining layer of a desired shape.
- one example of forming a layer of a matrix material includes: forming a first layer of host material on a substrate provided with an electrode; sputtering a metal on the first layer of matrix material to form dispersedly arranged nano metal particles; A second matrix material layer is formed on the first matrix material layer formed with dispersedly arranged nano metal particles.
- another example of forming a layer of a matrix material includes: simultaneously sputtering a host material and nano metal particles on a substrate provided with an electrode to form a layer of a matrix material doped with nano metal particles.
- the method further comprises: immersing the pixel defining layer of the desired shape with an etching solution to remove the exposed nano metal particles.
- the matrix material may be silica, silicon oxynitride, aluminum oxide, or the like.
- a further example of forming a layer of a matrix material includes: providing the nano metal particles; mixing the nano metal particles with a matrix material to form a mixed solution of nano metal particles; coating the mixed solution on a substrate provided with an electrode On top, a layer of a matrix material doped with nano metal particles is formed.
- the matrix material can be polyimide.
- the matrix material can be a SiO 2 gel.
- the method may further include: forming an isolation layer around the nano metal particles, the isolation layer and the nano metal particles forming a separate core-shell structure;
- the nano metal particles having the outer layer formed with the separation layer are mixed with the matrix material to form a mixed solution of the nano metal particles.
- FIG. 1 is a schematic structural view of an organic electroluminescent device according to an embodiment of the present invention.
- FIG. 2 is a schematic structural diagram of an organic electroluminescent device according to another embodiment of the present invention
- FIG. 4 is a flow chart of a method for fabricating an organic electroluminescent device according to another embodiment of the present invention
- FIG. 6 is a flow chart of a method for preparing an organic electroluminescent device according to another embodiment of the present invention.
- the organic electroluminescent device comprises a substrate 1, an anode 2 disposed on the substrate 1, a pixel defining layer 3 disposed on the substrate 1 and the anode 2, and a cathode disposed above the pixel defining layer. 4.
- a light emitting structure 5 is disposed in a space defined by the pixel defining layer 3.
- the light emitting structure 5 may be a single layer structure, for example, including only one layer of organic light emitting material; the light emitting structure 5 may also be a three layer device structure, for example The hole transport layer, the light emitting layer, and the electron transport layer are sequentially included from bottom to top; in addition, the light emitting structure 5 may also be a five-layer device structure, including a hole injection layer 51 in order from bottom to top as shown in FIGS. 1 and 2. The hole transport layer 52, the light-emitting layer 53, the electron transport layer 54, and the electron injection layer 55.
- the light-emitting structure 5 may further include a plurality of light-emitting layers, or other film layer structures including a hole blocking layer, which are not limited in this embodiment.
- Figures 1 and 2 of the present embodiment are pixel defining layers in the organic electroluminescent device of the present embodiment for better illustration.
- the specific selection of the substrate, the anode, the cathode, and the luminescent material shown in the drawing and their positional relationship with the pixel defining layer, the size relationship, and the like are not limited to the embodiment.
- the pixel defining layer 3 is doped with nano metal particles.
- the nano metal particles are metal particles having a particle size of nanometers, for example, the particle diameter may be Inm - 100 nm, and the nano metal particles are provided in a dispersed form in the pixel defining layer.
- the content of the nano metal particles in the pixel defining layer is not specifically limited in the embodiment of the present invention. However, it is understood that the content is preferably such that leakage or short circuit between pixels is not caused.
- the doping of the nano metal particles in the pixel defining layer may be uniformly doped, as shown in FIG. 2; or may be uneven doping, for example, the nano metal particles are embedded in the pixel defining layer according to a certain regular pattern. As shown in Fig. 1, the nano metal particles are only in the range of one plane in the middle of the pixel defining layer.
- the organic light-emitting layer of the light-emitting structure 5 contains a light-emitting molecule, and the light-emitting molecule may be a fluorescent molecule or a phosphorescent molecule.
- a luminescent molecule will be described as an example of a fluorescent molecule.
- SP refers to an electron-dense wave that propagates along a metal surface generated by the interaction of free-vibrating electrons existing on a metal surface and photons. If the surface of the metal is very rough or in the vicinity of the curved structure of the metal (such as spheres, cylinders, etc.), then SP cannot propagate along the interface in the form of waves, but is confined to the surface of these structures, in this special In the case, SP is also called Localized Surface Plasmon (LSP).
- LSP Localized Surface Plasmon
- the oscillation frequency of this resonance is mainly determined by the electron density of the metal (determined by the type of metal), the effective electron mass, the size and shape of the particles, the surrounding medium, and the like.
- LSP resonance occurs, the electromagnetic field around the nano metal particles is greatly enhanced.
- the LSP resonance has the following effects.
- the light radiated by the excitons acts on the metal nanoparticles to induce LSP resonance, thereby causing an increase in the local electric field near the fluorescent molecules, thereby improving The rate of exciton transition radiation enhances internal quantum efficiency.
- the scattering effect of the metal nanoparticles can change the direction of the light that is irradiated onto the nanoparticles, and scatter the light that could not be emitted outside the device to the outside of the device, thereby enhancing the light-emitting efficiency of the device.
- the scattering cross section of the external light is greatly enhanced due to the action of the LSP.
- the organic electroluminescent device provided by the embodiment of the invention is doped with nano metal particles in its pixel defining layer.
- the organic electroluminescent device When the organic electroluminescent device is energized, the light incident into the pixel defining layer interacts with the nano metal particles in the pixel defining layer to cause LSP resonance.
- This resonance effect not only increases the excitation intensity and efficiency of the fluorescent molecules, increases the fluorescence quantum yield, increases the internal quantum efficiency, and more importantly, this resonance effect also greatly increases the light scattering of the metal nanoparticles and The absorption cross section scatters light that could not be emitted from the outside, which increases the external quantum efficiency and improves the luminous efficiency of the organic electroluminescent device.
- the resonance effect does not change the luminescence spectrum of the organic electroluminescence device compared to the optical microcavity effect, and the original color of the device is maintained to the utmost while improving the luminescence efficiency.
- the nano metal particles have a particle size of from 1 nm to 100 nm. Further preferably, nano metal particles having different particle diameter sizes may be doped in the pixel defining layer to accommodate the wavelength of light from the light emitting layer 53.
- the nano metal particles may be one of gold, silver, aluminum, or may be their respective alloys. It may be an alloy composed of two or three of gold, silver, and aluminum.
- the nano metal particles may be one or more of a spherical shape, a prismatic shape, a cubic shape, and a cage shape.
- the cage refers to a structure in which the interior of the nano metal particles is hollow, and the outside is uniformly arranged with holes and corners. The increase in field strength caused by LSP resonance is mainly concentrated at the tip angle of these structures, and the enhancement factor of the field strength at these positions is larger. Stronger luminous efficiency.
- an isolation layer may be disposed between the nano metal particles and the luminescent molecules. This is because during the interaction of the nano metal particles with the luminescent molecules from the luminescent structure 5, there are simultaneously opposite processes of fluorescence quenching and fluorescence enhancement. When the distance between the nano metal particles and the luminescent molecules is too close, the fluorescence quenching effect is easily caused. Therefore, a more preferred solution is to provide an isolating layer between the nano metal particles and the luminescent molecules.
- an isolation layer may be disposed between the portion of the nano metal particles and the luminescent molecules.
- the spacer layer may be part of a pixel defining layer, i.e., the spacer layer is disposed in the pixel defining layer 3 to separate the nano metal particles from the light emitting structure 5.
- the spacer layer may also constitute a core-shell structure together with the nano metal particles.
- the nano metal particles are cores and the separator is a shell. There may be voids between the core shells, or they may be in direct contact.
- the spacer layer may be an insulating medium and may be selected from one or more of Si0 2 , Si 3 N 4 , SiO x Ny, A1 2 0 3 , Y 2 0 3 , Ti0 2 , Ta 2 0 5 , Hf0 2 .
- the separator may also be an organic polymer material selected from, for example, polydecyl acrylate (PMMA), polypyrrole, polyaniline, polyethylene, polystyrene-acrylic copolymer (PST-AA), polystyrene, and the like.
- the embodiment of the present invention further provides a method for preparing an organic electroluminescent device, which comprises a method for preparing a pixel defining layer, as shown in FIG.
- the method of preparing the pixel defining layer includes the following process.
- the matrix material may be SiO 2 particles, polyimide, SiO 2 gel or the like.
- the above anode is an example of an electrode of an electroluminescent device.
- the present invention is not limited to the case where an anode is formed on a substrate, and for example, a cathode may be formed on the substrate.
- the cathode is first formed on the substrate, the related preparation manner may be substantially the same as the case where the anode is first formed on the substrate, and thus the present disclosure is not particularly repeated.
- the substrate material layer is processed by a patterning process to obtain a pixel boundary layer of a desired shape.
- the patterning process may be performed by coating the photoresist or by using the light sensitization of the matrix material itself, by processing the substrate material by exposure, development and/or etching steps.
- the desired shape that is, the final pixel-defining layer.
- one or more layers of luminescent materials may be sequentially formed in a space defined by the pixel defining layer.
- the hole injection layer 51, the hole transport layer 52, and the luminescent layer are sequentially formed.
- An electron transport layer 54, an electron injection layer 55, and then a cathode 4 is formed on the pixel defining layer 3 and the electron injection layer 55.
- this embodiment does not specifically limit this.
- a three-layer light-emitting structure of a hole transport layer, a light-emitting layer, an electron transport layer, or a single-layer light-emitting structure in which only one light-emitting layer is formed may be sequentially formed.
- a layer of a matrix material doped with nano metal particles is formed on the bottom.
- the resonance effect can not only improve the excitation intensity and efficiency of the fluorescent molecule, increase the fluorescence quantum yield, increase the internal quantum efficiency, but more importantly, the resonance effect also greatly increases the light of the metal nanoparticle.
- the scattering effect and the absorption cross section scatter light that would otherwise not be emitted from the outside, which increases the external quantum efficiency and improves the luminous efficiency of the organic electroluminescent device.
- the resonance effect does not change the illuminating utterance of the organic electroluminescent device, and the original color of the device is maintained to the utmost while improving the luminous efficiency.
- an example of a method of preparing a pixel defining layer includes the following process.
- the first matrix material layer may be formed by an electron beam evaporation process or a vapor deposition process, and the material in the first matrix material layer is, for example, silicon dioxide, formed on the substrate by electron beam evaporation or vapor deposition.
- the material in the first matrix material layer may also be silicon oxynitride, aluminum oxide or the like.
- nano metal particles such as a layer of nano silver particles
- the thickness of the nano metal particle layer may be selected to be l-3 nm.
- This step is similar to step 201, and can still be formed by electron beam evaporation process or vapor deposition process.
- the second matrix material layer, the material in the second matrix material layer is, for example, silicon dioxide, silicon oxynitride, aluminum oxide or the like.
- the layer of the matrix material consisting of the first matrix material layer and the second matrix material layer is processed by a patterning process to obtain a pixel defining layer of a desired shape.
- a specific patterning process may be selected according to the matrix materials used in steps 201 and 203.
- the materials in the first and second matrix material layers are non-photosensitive SiO 2 .
- a pixel defining layer of a desired shape can be obtained by spin coating a layer of photoresist on the second layer of host material, performing process steps such as exposure, development, and etching.
- another example of the method of preparing the pixel defining layer includes the following process.
- a composite film of a matrix material and a nano metal particle can be prepared by a multi-target magnetron sputtering technique, for example, the matrix material is silicon dioxide, and the nano metal particles are gold, and simultaneously sputtering silicon dioxide and gold to form Au- Si0 2 composite film.
- the composite film of different doping ratios can be obtained by adjusting the opening of the mask before the sputtering target, selecting the ratio of the metal particles and the matrix material deposited on the substrate.
- the matrix material may be silicon oxynitride, aluminum oxide or the like in addition to silica.
- the substrate material layer is processed by a patterning process to obtain a pixel boundary layer of a desired shape.
- a specific patterning process may be selected according to the matrix material used in step 301. If the matrix material is non-photosensitive SiO 2 , in this step, a layer of photoresist may be spin-coated on the layer of the matrix material. Process steps such as exposure, development, and etching are performed to obtain a pixel defining layer of a desired shape.
- the above two methods mainly use a sputtering process to form nano metal particles.
- a sputtering process since the nano metal particles are likely to be exposed to the surface of the matrix material layer, the performance of the organic electroluminescent device is disadvantageous. Therefore, after steps 204 and 302 of the above two methods, a process for removing the dew nano metal particles may be separately included.
- the pixel-defining layer of the desired shape may be immersed with an etching solution to remove the exposed nano metal particles.
- an insulating layer may be formed over the formed matrix material layer to prevent adverse effects of the nano metal particles exposed to the surface of the matrix material layer on the performance of the organic electroluminescent device.
- still another example of the method of fabricating the pixel defining layer includes the following process.
- granulation can be carried out by a thermal decomposition method, an electrochemical method, a microwave reduction method, a chemical reduction method or the like.
- a thermal decomposition method an electrochemical method, a microwave reduction method, a chemical reduction method or the like.
- nano metal particles can be obtained from others.
- the matrix material in this step can be selected according to whether the nano metal particles formed in step 401 are oil-soluble or water-soluble. For example, if oil-soluble nano metal particles are obtained in step 401, this step may select an oil-soluble photoresist commonly used to form a pixel defining layer as a host material, such as a polyimide material. If water soluble nano metal particles are obtained in step 401, this step may select a water soluble material that is typically used to form the pixel as a matrix material, such as a SiO 2 gel.
- a specific patterning process may be selected according to the matrix material selected in step 402. If the matrix material is non-photosensitive SiO 2 , in this step, a layer of photoresist may be spin-coated on the layer of the matrix material. Process steps such as exposure, development, and etching are performed to obtain a pixel defining layer of a desired shape. If the host material is a photosensitive photoresist such as a polyimide material, the pixel defining layer of the desired shape can be obtained directly by a process step of exposure, development, and the like.
- the step 402 may further include: forming an isolation layer on the periphery of the nano metal particles, the isolation layer and the nano metal The particles constitute an independent core-shell structure.
- the nano metal particles may form a core-shell structure with the separator.
- the separator is, for example, Ti0 2 , polystyrene or the like.
- An example of the step 402 may be: mixing the nano metal particles having the isolation layer formed on the periphery with the matrix material to form a mixed solution of the nano metal particles.
- Example 1 Organic electroluminescent device containing an Ag-SiO 2 pixel defining layer
- a layer of SiO 2 film 31 is deposited by electron beam evaporation or vapor deposition on a substrate 1 containing an anode 2 (e.g., ITO).
- anode 2 e.g., ITO
- a 2 nm thick silver layer was deposited on the surface of the SiO 2 film 31 by sputtering.
- the gas pressure in the chamber during sputtering was 10 Pa
- the atmosphere was argon gas
- the gas flow was maintained at 30 sccm (standard-state cubic centimeter per mimute, The standard condition is cubic centimeters per minute)
- the sputtering current is 0.2A
- the voltage is 0.5KV
- the substrate temperature is 200 °C.
- it was placed in a vacuum atmosphere having a degree of vacuum of less than 1 X 10 ⁇ 3 Pa, annealed at a temperature of 300 ° C for half an hour, and then cooled to room temperature to form a discontinuous layer of nano silver particles 32.
- a layer of SiO 2 film 33 is then deposited on the discontinuous layer of nanosilver particles 32 by electron beam evaporation or vapor deposition to cover the silver particles.
- a layer of photoresist is spin-coated, exposed, developed, and etched to obtain a desired shape of the pixel defining layer 3.
- a hole injection layer 51, a hole transport layer 52, a light-emitting layer 53, an electron transport layer 54, an electron injection layer 55, a cathode layer 4, and the like are sequentially deposited in a space defined by the pixel defining layer 3, and finally formed as shown in FIG. Organic electroluminescent device.
- Example 2 Organic electroluminescent device containing an Au-SiO 2 pixel defining layer
- a Au-SiO 2 composite film of a metal nanoparticle dispersed oxide is prepared by a multi-target magnetron sputtering technique.
- a target is placed with high-purity Si0 2 , one placed with high purity Au.
- the sputtering gas was high purity argon (99.995%).
- Vacuum degree before sputtering chamber is ⁇ 5 xl (T 5 Pa, a sputtering pressure of 1.6 10 sputtering argon and oxygen flow rate were 8.3xl0_ 8 m 3 / s and 5.8xl0 "8 m 3 / s
- the RF power of Si0 2 and Au is 200W and 50W respectively.
- the Au-SiO 2 composite film is processed by a patterning process to obtain a pixel defining layer 3 of a desired shape.
- the patterning process may be performed by dry etching such as plasma etching, or by spin coating.
- the wet etching method in which the photoresist is subjected to exposure and development is not described here.
- the pixel defining layer lmin was soaked with Au etching solution of KI/I 2 /H 2 0 (1 g/1 g/200 mL) to remove the exposed Au from the edge, and the final pixel defining layer structure was obtained.
- a hole injection layer 51, a hole transport layer 52, a light-emitting layer 53, an electron transport layer 54, an electron injection layer 55, a cathode layer 4, and the like are sequentially deposited in a space defined by the pixel defining layer, and finally an organic electroluminescent device is formed.
- the structure of the device is shown in Figure 2.
- Example 3 Organic electroluminescent device containing cubic nano-Ag-polyimide pixel defining layer
- cubic nano silver is prepared by a chemical reduction method.
- 3 mL of silver nitrate in ethylene glycol solution (0.1 M) and 3 mL of PVP in ethylene glycol solution (0.6 M) were injected into a three-necked flask containing 5 mL of ethylene glycol through a two-channel syringe pump. °C heating under constant temperature reflux. The feed rate was controlled at 0.3 mL/min. The mixture was refluxed at 160 ° C for 60 min under magnetic stirring. After the end of the reaction, 5-10 times the amount of acetone was added to dilute, and then the centrifugation was repeated several times, and the supernatant was removed each time to finally obtain pure cubic nano silver particles.
- the prepared cubic nano silver particles were dispersed with isopropyl alcohol to obtain a solution which can be spin-coated.
- the isopropyl alcohol solution of the above dispersed cubic nano silver particles is thoroughly mixed with a photoresist material which can form the pixel defining layer 3, and then spin-coated on the substrate 1 on which the conductive anode 2 (such as an ITO layer) is formed.
- the film of the above mixed material is dried, and then subjected to a process of exposure, development, etc. to obtain a patterned pixel defining layer structure 3 embedded with cubic nano silver particles.
- a hole injection layer 51, a hole transport layer 52, a light-emitting layer 53, an electron transport layer 54, an electron injection layer 55, a cathode layer 4, and the like are sequentially deposited in a space defined by the pixel defining layer, and finally an organic electroluminescent device is formed.
- the structure of the device is shown in Figure 2.
- Example 4 Organic electroluminescent device containing Au-polyimide pixel defining layer
- the nano gold particles synthesized in this step A are oil-soluble, and in step B, a photoresist material compatible with the oil-soluble particles is selected.
- the size of the gold nanoparticles formed by the reverse microemulsion system is controlled, and the protective surfactant 4-dodecyloxybenzylamine (C 12 OBA ) is taken as an example.
- the specific steps are as follows: First, 0.50 mL of 9.7 10" 3 M chloroauric acid (HAuCl 4 ) aqueous solution was evaporated to dryness in a 50 mL beaker, followed by 16.0 mL of n-heptane, 4.0 mL of n-butanol, 0.141 g of 4- Dodecyloxybenzylamine (C 12 OBA/HAuCl 4 molar ratio 100:1), the mixture was ultrasonically dispersed into a clear, transparent pale yellow solution at room temperature.
- composition ratio of the respective microemulsion components having different size and morphology of C 12 OBA hydrophobic protected gold nanoparticles can be produced that is.
- the gold nanoparticle prepared in the step A was dissolved in a chloroform solution to form a gold chloroform sol, and a certain amount of a polyimide solution was added thereto, followed by thorough mixing.
- the mixed solution is spin-coated, and then a series of patterning processes commonly used in the semiconductor industry, such as drying, exposure, and development, are used to obtain a final patterned pixel boundary layer structure.
- One or more layers of luminescent material and metal cathode layer are deposited in the pixel defining layer and encapsulated to obtain an organic electroluminescent device containing uniformly distributed nano gold particles in the pixel defining layer.
- Example 5 Organic electroluminescent device containing Au@Ti0 2 -SiO 2 gel pixel defining layer
- the nano gold sol was prepared by reducing chloroauric acid (HAuCl 4 ) with sodium citrate, and then adding an ethanol solution of tetrabutyl titanate, and continuously stirring, refluxing, filtering, washing and drying to obtain Au@Ti0 2 core- Nanoparticles of the shell structure.
- the composite nanoparticles can be effectively dispersed in a hydrophilic solvent for the next pixel-defining layer formation process.
- the above Au@Ti0 2 core-shell nanoparticles were first ultrasonically dispersed in a water-ethanol system. Ethyl orthosilicate, absolute ethanol, and dilute hydrochloric acid were uniformly mixed in a certain ratio to form a SiO 2 gel at room temperature. Then, the ⁇ : system of Au@Ti0 2 and the Si0 2 gel are mixed in a certain ratio to obtain a coating. The solution was then spin-coated (coated on the ITO layer containing the TFT driving unit on the underlayer), and dried to obtain a SiO 2 film in which Au@Ti0 2 particles were embedded. Subsequently, a layer of photoresist is spin-coated thereon, and exposure, development, fixing, and the like are performed to obtain a patterned pixel defining layer structure.
- One or more layers of luminescent material and metal cathode layer are deposited in the pixel defining layer and encapsulated to obtain an organic electroluminescent device containing uniformly distributed nano gold particles in the pixel defining layer.
- Example 6 Organic electroluminescent device containing Ag@polystyrene-polyimide pixel defining layer
- the above device was placed in a constant temperature water bath, stirring was maintained for about 10 minutes, and the temperature was lowered to 30 ° C to avoid premature decomposition after the initiator KPS (potassium persulfate) was added due to excessive temperature; the initiator KPS was added and stirring was maintained for 20 minutes. N 2 rows of 0 2 ; Then, the purified styrene monomer was placed in the dropping funnel and added dropwise to the reaction system, and the mixture was dropped in about 10 minutes; then, the temperature was raised to 70 ° C, and the stirring rate during the reaction was passed. The N 2 rate remains constant. After 5 hours, the reaction was terminated, and the mixture was naturally cooled to a temperature below 40 ° C under stirring to obtain a composite latex.
- the initiator KPS potassium persulfate
- the composite latex was demulsified with NaCl, it was filtered, washed, and dried to obtain a core-shell structure of Ag @polystyrene having nano silver particles as a core and polystyrene as a shell.
- the Ag@polystyrene core-shell structure prepared above is dispersed in an organic solvent, and then mixed with a polyimide solution, and a photoresist film is obtained by a spin coating process, followed by drying, exposure, development, fixing, etc. Process, to obtain a graphical pixel-defining layer structure.
- the pixel defining layer structure contains uniformly distributed Ag@polystyrene core-shell nanoparticles.
- One or more layers of luminescent material and metal cathode layer are deposited in the pixel defining layer and encapsulated to obtain an organic electroluminescent device containing uniformly distributed nano gold particles in the pixel defining layer.
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