Organic light emitting diode device and manufacturing method thereof, and display panel

Abstract

An organic light emitting diode device and a manufacturing method thereof, and a display panel, the organic light emitting diode device comprising: a plurality of pixels, each pixel comprising at least two sub-pixels generating light of different colors, the sub-pixels comprising a first electrode, a second electrode, and a light emitting layer between the first electrode and the second electrode; the sub-pixels further comprising a microcavity adjustment layer including pores formed on a side of the first electrode away from the light emitting layer, the porosity and average pore size of the pores of the microcavity adjustment layer of the sub-pixels generating light of different colors being different. The average pore size and porosity of the pores in the microcavity adjustment layer of the sub-pixels generating light of different colors included in the organic light emitting diode device are different, so that the organic light emitting diode device can adjust the microcavity effect of the organic light emitting diode device through the microcavity adjustment layer, thereby adjusting the color saturation of the organic light emitting diode device.

Description

Technical Field

[0001] Embodiments of the present disclosure relate to an organic light emitting diode device and a method for manufacturing the same, and a display panel. Background Art

[0002] Organic light-emitting diodes have the characteristics of self-luminescence, wide viewing angle, wide color gamut, fast response speed, high luminous efficiency, and low operating voltage, and are widely used in display panels and other fields. In organic light-emitting diodes, the microcavity effect refers to when the light-emitting area of ​​the organic light-emitting diode is located in a resonant cavity composed of a total reflection film and a semi-reflection film, and the wavelength of the light emitted by the light-emitting area is at the same order of magnitude as the cavity length of the resonant cavity, the light of this specific wavelength will be selected and enhanced. Summary of the invention

[0003] At least one embodiment of the present disclosure provides an organic light-emitting diode device, comprising: a plurality of pixels, each pixel comprising at least two sub-pixels generating light of different colors, the sub-pixels comprising a first electrode, a second electrode, and a light-emitting layer between the first electrode and the second electrode; the sub-pixels further comprising a microcavity adjustment layer comprising pores and located on a side of the first electrode away from the light-emitting layer, the pores of the microcavity adjustment layer of the sub-pixels generating light of different colors having different porosities and average pore sizes.

[0004] For example, in the organic light emitting diode device provided in at least one embodiment of the present disclosure, the organic light emitting diode device is a top emission organic light emitting diode device, and the first electrode is away from the light emitting side of the organic light emitting diode device relative to the second electrode.

[0005] For example, in the organic light-emitting diode device provided in at least one embodiment of the present disclosure, the first electrode is close to the light-emitting side of the organic light-emitting diode relative to the second electrode, the microcavity adjustment layer is located on the side of the first electrode away from the light-emitting layer, and the light refractive index of the microcavity adjustment layer is 1.1-1.7.

[0006] For example, in the organic light-emitting diode device provided by at least one embodiment of the present disclosure, the at least two sub-pixels that generate light of different colors include a first sub-pixel and a second sub-pixel, the wavelength of light emitted by the first sub-pixel is greater than the wavelength of light emitted by the second sub-pixel, and the average pore size of the pores included in the microcavity adjustment layer in the first sub-pixel is greater than the average pore size of the pores included in the microcavity adjustment layer in the second sub-pixel.

[0007] For example, in the organic light-emitting diode device provided in at least one embodiment of the present disclosure, the wavelength of light emitted by the first sub-pixel is greater than the wavelength of light emitted by the second sub-pixel, and the porosity of the microcavity adjustment layer in the first sub-pixel is less than the porosity of the microcavity adjustment layer in the second sub-pixel.

[0008] For example, in the organic light-emitting diode device provided by at least one embodiment of the present disclosure, the at least two sub-pixels that generate light of different colors include three sub-pixels, and the three sub-pixels include a red sub-pixel, a green sub-pixel, and a blue sub-pixel. The average pore sizes of the pores included in the microcavity adjustment layer in the red sub-pixel, the green sub-pixel, and the blue sub-pixel decrease sequentially, and the porosity of the microcavity adjustment layer in the red sub-pixel, the green sub-pixel, and the blue sub-pixel increases sequentially.

[0009] For example, in the organic light-emitting diode device provided in at least one embodiment of the present disclosure, the average pore size of the pores included in the microcavity adjustment layer in the red sub-pixel is 700nm-1000nm; the average pore size of the pores included in the microcavity adjustment layer in the green sub-pixel is 300nm-700nm; the average pore size of the pores included in the microcavity adjustment layer in the blue sub-pixel is 100nm-300nm.

[0010] For example, in the organic light emitting diode device provided in at least one embodiment of the present disclosure, the material of the microcavity adjustment layer includes one or two of polystyrene, polymethyl methacrylate, polyvinyl pyrrolidone and polyimide.

[0011] At least one embodiment of the present disclosure provides a display panel, comprising any one of the above-mentioned organic light emitting diode devices.

[0012] At least one embodiment of the present disclosure provides a method for manufacturing an organic light-emitting diode device, comprising: forming a plurality of pixels, each pixel comprising at least two sub-pixels that generate light of different colors, the sub-pixels comprising a first electrode, a second electrode, and a light-emitting layer between the first electrode and the second electrode; the manufacturing method further comprises forming a microcavity adjustment layer comprising pores on a side of the first electrode away from the light-emitting layer, the pores of the microcavity adjustment layer of the sub-pixels that generate light of different colors having different porosities and average pore sizes.

[0013] For example, in the manufacturing method of an organic light-emitting diode device provided by at least one embodiment of the present disclosure, the at least two sub-pixels that generate light of different colors include a first sub-pixel and a second sub-pixel, and the formation of a microcavity adjustment layer including pores includes: mixing a first polymer material and a second polymer material with a co-solvent to form a mixture, wherein the solubility of the first polymer material in the co-solvent is greater than the solubility of the second polymer material in the co-solvent; performing a film-forming treatment on the mixture on a substrate to form a mixture film, and the film-forming treatment includes a first heating treatment; fully contacting the mixture film with an extractant so that pores are formed in the mixture film, and then performing a second heating treatment to evaporate the extractant, wherein the extractant is a good solvent for the first polymer and a poor solvent for the second polymer; wherein the heating temperatures when the first sub-pixel and the second sub-pixel are subjected to the first heating treatment are different, so that pores with different porosities and average pore sizes are formed in the mixture film after the mixture is fully contacted with the extractant.

[0014] For example, in the method for manufacturing an organic light emitting diode device provided in at least one embodiment of the present disclosure, the wavelength of light emitted by the first sub-pixel is greater than the wavelength of light emitted by the second sub-pixel, and correspondingly, the heating temperature for the heat treatment performed on the first sub-pixel is lower than the heating temperature for the heat treatment performed on the second sub-pixel.

[0015] For example, in the method for manufacturing an organic light-emitting diode device provided by at least one embodiment of the present disclosure, the at least two sub-pixels that generate light of different colors include three sub-pixels, and the three sub-pixels include a red sub-pixel, a green sub-pixel, and a blue sub-pixel, and the heating temperature of the microcavity adjustment layer in the red sub-pixel, the green sub-pixel, and the blue sub-pixel during the heating treatment during the formation process increases sequentially.

[0016] For example, in the method for manufacturing an organic light-emitting diode device provided in at least one embodiment of the present disclosure, the first polymer material is one of polystyrene, polymethyl methacrylate, polyvinyl pyrrolidone and polyimide, and the second polymer material is another of polystyrene, polymethyl methacrylate, polyvinyl pyrrolidone and polyimide.

[0017] The method for preparing an organic light-emitting diode device provided in the embodiment of the present disclosure can prepare an organic light-emitting diode device having a microcavity adjustment layer including pores, and the method can adjust the average pore size and porosity of the pores included in the microcavity adjustment layer in different sub-pixels of the organic light-emitting diode device, thereby adjusting the microcavity effect generated by different sub-pixels of the organic light-emitting diode device, and finally achieving the technical effect of adjusting the color saturation of different color lights emitted by different sub-pixels of the organic light-emitting diode device. In addition, the method of this embodiment has a simple preparation process, low cost, and is suitable for large-scale production. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions of the embodiments of the present disclosure, the drawings of the embodiments will be briefly introduced below. Obviously, the drawings in the following description only relate to some embodiments of the present disclosure, but are not intended to limit the present disclosure.

[0019] Figure 1A and 1B Schematic diagram 1 of an organic light emitting diode device provided by an embodiment of the present disclosure;

[0020] Figure 2A and 2B A second schematic diagram of an organic light emitting diode device provided in an embodiment of the present disclosure;

[0021] Figure 3 A flow chart for preparing a microcavity adjustment layer provided in one embodiment of the present disclosure;

[0022] Figures 4A-4D A schematic diagram of a preparation process of a microcavity adjustment layer provided in an embodiment of the present disclosure;

[0023] Figure 5A and 5B Schematic diagram of an organic light emitting diode device provided by an embodiment of the present disclosure Figure 3 ;

[0024] Fig. 6A and 6B Schematic diagram 4 of an organic light emitting diode device provided in one embodiment of the present disclosure.

[0025] Reference numerals:

[0026] 101-first electrode; 102-second electrode; 103-light-emitting layer; 104-microcavity adjustment layer; 107-hole injection layer / hole transport layer; 108-electron injection layer / electron transport layer; 201-first electrode; 202-second electrode; 203-light-emitting layer; 204-microcavity adjustment layer; 205-substrate; 206-thin film transistor; 207-hole transport layer / hole injection layer; 208-electron transport layer / electron injection layer. DETAILED DESCRIPTION

[0027] In order to make the purpose, technical solution and advantages of the embodiments of the present disclosure clearer, the technical solution of the embodiments of the present disclosure will be clearly and completely described below in conjunction with the drawings of the embodiments of the present disclosure. Obviously, the described embodiments are part of the embodiments of the present disclosure, not all of the embodiments. Based on the described embodiments of the present disclosure, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present disclosure.

[0028] Unless otherwise defined, the technical terms or scientific terms used in the present disclosure should be understood by people with ordinary skills in the field to which the present disclosure belongs. The "first", "second" and similar words used in the present disclosure do not indicate any order, quantity or importance, but are only used to distinguish different components. "Include" or "comprise" and similar words mean that the elements or objects appearing before the word cover the elements or objects listed after the word and their equivalents, without excluding other elements or objects. "Connect" or "connected" and similar words are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0029] The microcavity effect refers to the phenomenon that when the light-emitting area of ​​a device is located in a resonant cavity and the cavity length of the resonant cavity is of the same order of magnitude as the wavelength of the light emitted by the light-emitting area, the light of the wavelength will be selected and enhanced, thereby narrowing the spectrum. The inventors of the present disclosure have found in their research that the color saturation of organic light-emitting diodes is often affected by the microcavity effect and is low.

[0030] At least one embodiment of the present disclosure provides an organic light-emitting diode device, comprising: a plurality of pixels, each pixel comprising at least two sub-pixels generating light of different colors, the sub-pixel comprising a first electrode, a second electrode, and a light-emitting layer between the first electrode and the second electrode; the sub-pixel further comprising a microcavity adjustment layer including pores formed on a side of the first electrode away from the light-emitting layer, the porosity and average pore size of the pores in the microcavity adjustment layer of the sub-pixels generating light of different colors being different.

[0031] At least one embodiment of the present disclosure provides a display panel, which includes any one of the above-mentioned organic light emitting diode devices.

[0032] At least one embodiment of the present disclosure provides a method for manufacturing an organic light-emitting diode device, comprising: forming a plurality of pixels, each pixel comprising at least two sub-pixels that generate light of different colors, the sub-pixels comprising a first electrode, a second electrode, and a light-emitting layer between the first electrode and the second electrode; the manufacturing method further comprises forming a microcavity adjustment layer comprising pores on a side of the first electrode away from the light-emitting layer, the pores of the microcavity adjustment layer of the sub-pixels that generate light of different colors having different porosities and average pore sizes.

[0033] The organic light emitting diode device and the manufacturing method thereof and the display panel disclosed in the present invention are described below through several specific embodiments.

[0034] Embodiment 1

[0035] This embodiment provides a method for manufacturing an organic light emitting diode device, such as Figure 1A-Figure 2B As shown, the manufacturing method of the organic light emitting diode device includes: forming a plurality of pixels, each pixel including at least two sub-pixels generating light of different colors, the sub-pixels including a first electrode 101, a second electrode 102, and a light emitting layer 103 between the first electrode 101 and the second electrode 102; the manufacturing method also includes forming a microcavity adjustment layer 104 including pores on a side of the first electrode 101 away from the light emitting layer 103, the porosity and average pore size of the pores of the microcavity adjustment layer in the sub-pixels generating light of different colors are different.

[0036] For example, an organic light-emitting diode includes a first sub-pixel and a second sub-pixel. For example, a microcavity adjustment layer including pores can be formed on a side of the first electrode 101 or the second electrode 102 away from the light-emitting layer 103, and the porosity and average pore size of the pores in the microcavity adjustment layer in the first sub-pixel are different from the porosity and average pore size of the pores in the microcavity adjustment layer in the second sub-pixel.

[0037] In this embodiment, Figure 1A As shown, the microcavity adjustment layer 104 can be formed on the side of the first electrode 101 away from the light emitting layer 103, or as shown in Figure 1B As shown, the microcavity adjustment layer 104 can be formed on the side of the second electrode 102 away from the light-emitting layer 103. Alternatively, the positions of the first electrode 101 and the second electrode 102 can be interchanged, that is, Figure 2A and Figure 2B In this embodiment, the specific formation positions of the first electrode 101 and the second electrode 102 are not limited.

[0038] In at least some examples of this embodiment, Figure 1A-Figure 2BAs shown, a hole injection layer, a hole transport layer and other functional layers may be further provided between the first electrode 101 and the light-emitting layer 103, i.e., at 107; an electron injection layer, an electron transport layer and other functional layers may be further provided between the second electrode 102 and the light-emitting layer 103, i.e., at 108.

[0039] In this embodiment, the first electrode may be, for example, an anode, and the second electrode may be, for example, a cathode; or, the first electrode may be, for example, a cathode, and the second electrode may be, for example, an anode, which is not limited in this embodiment.

[0040] In this embodiment, the average pore diameter and porosity of the pores in the microcavity adjustment layer 104 formed in different sub-pixels of the organic light emitting diode device are different. Figure 1A In the illustrated case, the organic light emitting diode device shows three different sub-pixels, and the average pore diameters and porosities of the pores included in the microcavity adjustment layer 104 formed in the three different sub-pixels are different.

[0041] In this embodiment, Figure 3 As shown, forming the microcavity adjustment layer may include, for example, steps S101 to S103. Step S101: mixing a first polymer material and a second polymer material with a co-solvent.

[0042] In this embodiment, the microcavity adjustment layer 104 can be prepared by, for example, a polymer material. At least two polymer materials are selected, for example, a first polymer material and a second polymer material are selected. The first polymer material and the second polymer material are mixed with a co-solvent to form a mixture, wherein the solubility of the first polymer material in the co-solvent is greater than the solubility of the second polymer material in the co-solvent.

[0043] Step S102: film forming process.

[0044] The mixture obtained in step S101 is subjected to a film forming process on a substrate to form a mixture film. For example, the film forming process includes a first heating process.

[0045] In this embodiment, Figure 4A As shown, for example, the first polymer material, the second polymer material and the co-solvent are mixed and dissolved to form a mixed solution, and then a mixed solution layer is formed on the substrate by spin coating, or a method such as scraping or casting can also be used. For example, the substrate can be, for example, a substrate substrate on which a transistor and a driving unit are formed. In this embodiment, for example, a coating machine can be used to spin coat the mixed solution at a desired position at a certain rotation speed, for example, the rotation speed of the coating machine is set to about 1000rpm-3000rpm, for example, 1500rpm or 2000rpm.

[0046] For example, after the mixed solution layer is formed, it can be subjected to a first heat treatment. The first heat treatment can volatilize the co-solvent in the mixed solution layer. During the volatilization of the co-solvent, the second polymer material with a lower solubility in the co-solvent is more likely to precipitate and agglomerate, and the precipitated second polymer material finally forms a continuous film structure; while the first polymer material with a higher solubility in the co-solvent is more easily soluble in the co-solvent and therefore dispersed evenly, so that during the volatilization of the co-solvent, the first polymer material precipitates later in the mixed film and the precipitation position is more dispersed, so that the finally precipitated first polymer material is dispersed in the continuous film structure formed by the second polymer material in the form of particles. During the volatilization of the co-solvent, the precipitated first polymer particles tend to agglomerate with time, causing the particles to increase in size, while the number decreases.

[0047] For example, different first heating treatments are performed on the mixture films in different sub-pixels, such as heating treatments at different temperatures, so as to form pores with different average pore diameters and porosities in the mixture films in different sub-pixels.

[0048] In this embodiment, Figure 4B As shown, the mixture film is distributed in three different sub-pixels, namely the first sub-pixel 1, the second sub-pixel 2 and the third sub-pixel 3; in this embodiment, for example, the three different sub-pixels can be subjected to a first heating treatment at different temperatures, and the first heating treatment can accelerate the volatilization rate of the selected co-solvent, so that the heating treatment of the three different sub-pixels at different temperatures can make the volatilization rates of the co-solvents in the three sub-pixels different, and then the volatilization time required for the co-solvents in the three sub-pixels is different. The higher the heating temperature, the faster the volatilization rate of the co-solvent, and the less time required for the volatilization of the co-solvent, and then in the process of volatilization of the co-solvent, the first polymer material with a larger solubility in the co-solvent precipitates smaller particles and more in number, thereby making the average pore size of the pores in the microcavity adjustment layer finally formed in the three different sub-pixels smaller and the porosity higher. Therefore, in this embodiment, the average pore size and porosity of the pores formed in the microcavity adjustment layer can be adjusted by adjusting the heating temperature of different sub-pixels.

[0049] Step S103: contacting the mixture membrane with an extractant.

[0050] In this embodiment, the mixture film obtained in step S102 is fully contacted with an extractant, for example, the extractant is a good solvent (a solvent with strong solubility for the solute) for the first polymer material and a poor solvent (a solvent that is difficult to tolerate or insoluble in the solute) for the second polymer material, so that the extractant can dissolve more of the first polymer particles in the mixture film, so that pores are formed at the location of the first polymer particles in the mixture film. And because the heating temperatures in different sub-pixels are different, the size and number of the first polymer precipitated particles formed in the mixture film are different, and then the porosity and average pore size of the pores formed in the mixture film after the mixture film is fully contacted with the extractant are different. The higher the heating temperature in the first heat treatment, the smaller the average pore size of the pores finally formed in the mixture film and the higher the porosity.

[0051] For example, after the first polymer particles are dissolved, the porous mixture film can be subjected to a second heating treatment to accelerate the evaporation of the extractant, so as to prevent the extractant from damaging the mixture film structure due to long-term immersion of the mixture film. For example, the second heating treatment is to dry the mixture film, such as using a vacuum drying oven for drying, and the mixture film finally obtained can be used as a microcavity adjustment layer.

[0052] In this embodiment, the first polymer material can be, for example, one of polystyrene, polymethyl methacrylate, polyvinyl pyrrolidone and polyimide, and the second polymer material can be, for example, another of polystyrene, polymethyl methacrylate, polyvinyl pyrrolidone and polyimide. In this case, the co-solvent should be selected as a solvent that dissolves both the first polymer material and the second polymer material, and the solubility of the first polymer material in the co-solvent is greater than the solubility of the second polymer material in the co-solvent. The co-solvent is, for example, tetrahydrofuran or butanone. The extractant should be selected as a good solvent for the first polymer material and a poor solvent for the second polymer material. The extractant can be, for example, cyclohexane or cyclohexanone. For example, when the first polymer material selected is polystyrene and the second polymer material is polymethyl methacrylate, the co-solvent can be tetrahydrofuran and the extractant can be cyclohexane; for another example, when the first polymer material selected is polymethyl methacrylate and the second polymer material is polystyrene, the co-solvent can be butanone and the extractant can be cyclohexanone.

[0053] In this embodiment, for example, infrared light can be used to irradiate the mixture film through a mask plate, so as to perform a first heating treatment at different temperatures on different sub-pixels of the mixture film. For example, the parts of the mask plate selected in this embodiment corresponding to different sub-pixels of the mixture film have different light transmittances. Therefore, for example, when the mixture film is heated using the same infrared light source, the intensity of the infrared light emitted by the infrared light source will change accordingly after passing through different parts of the mask plate, so that the parts of the mixture film corresponding to the high light transmittance of the mask plate are irradiated with a higher intensity of infrared light, and thus the temperature of the heating treatment received by the parts is higher. Or, for example, infrared light of different light intensities of the same duration is irradiated through masks corresponding to different sub-pixels at the opening positions in turn, so that the sub-pixels corresponding to the infrared light with a stronger light intensity obtain a higher heating temperature.

[0054] For example, in one example of the present embodiment, the mixture film is at least correspondingly arranged in two different sub-pixels, such as a first sub-pixel and a second sub-pixel, and when the mixture film is used in a microcavity adjustment layer of an organic light-emitting diode device after being processed, the two sub-pixels can emit light of different wavelengths, for example, the wavelength of light emitted by the first sub-pixel is greater than the wavelength of light emitted by the second sub-pixel; at this time, when the mixture film undergoes a first heating treatment, the heating temperature of the first sub-pixel during the first heating treatment can be, for example, lower than the heating temperature of the second sub-pixel during the first heating treatment, so the mixture film corresponding to the first sub-pixel is subjected to a lower heating temperature during the heating treatment, so the co-solvent in this area evaporates more slowly, the time required for the co-solvent to evaporate is longer, and the first polymer particles are more likely to agglomerate, so the pores formed in the mixture film in the first sub-pixel finally have a larger average pore size and a lower porosity.

[0055] For example, Figure 4B As shown, in this embodiment, the mixture film can, for example, be correspondingly arranged at three different sub-pixels, namely, the first sub-pixel 1, the second sub-pixel 2 and the third sub-pixel 3, and when the mixture film is used for the microcavity adjustment layer of the organic light-emitting diode device after being treated, the wavelengths of light that can be emitted by the three sub-pixels are successively reduced; at this time, when the mixture film undergoes the first heating treatment, the heating temperatures of the first sub-pixel 1, the second sub-pixel 2 and the third sub-pixel 3 during the heating treatment can, for example, be successively increased, so that the evaporation rate of the co-solvent of the mixture film corresponding to the first sub-pixel 1, the second sub-pixel 2 and the third sub-pixel 3 is successively increased, and the time used for the evaporation of the co-solvent is successively reduced, so that the average pore size of the pores formed in the mixture film corresponding to the first sub-pixel 1, the second sub-pixel 2 and the third sub-pixel 3 is successively reduced, and the porosity is successively increased.

[0056] In this embodiment, for example, the same infrared light source can be used to perform different first heating treatments on the mixture films in different sub-pixels through a mask 10 having a pattern, such as Figure 4B As shown, since the heating temperatures of the first sub-pixel 1, the second sub-pixel 2 and the third sub-pixel 3 in the present embodiment are successively increased during the heating treatment, the light transmittance of the portions of the pattern of the mask 10 selected in the present embodiment corresponding to the first sub-pixel 1, the second sub-pixel 2 and the third sub-pixel 3 should be successively increased. For example, the light transmittance of the portions of the pattern of the mask 10 corresponding to the first sub-pixel 1, the second sub-pixel 2 and the third sub-pixel 3 is 30%, 50% and 100% respectively, and the temperature of the infrared light source is set to 60°C, for example, during the heating process. The time is set to 2 hours, so when the infrared light emitted by the infrared light source passes through the mask 10, the intensity of the transmitted infrared light corresponding to the first sub-pixel 1, the second sub-pixel 2 and the third sub-pixel 3 will increase in sequence, so the heating treatment temperature of the first sub-pixel 1, the second sub-pixel 2 and the third sub-pixel 3 in the mixture film increases in sequence, wherein the volatilization rate of the co-solvent increases in sequence, and the time used for the volatilization of the co-solvent decreases in sequence, so that the average pore size of the pores formed in the mixture film of the first sub-pixel 1, the second sub-pixel 2 and the third sub-pixel 3 decreases in sequence, and the porosity increases in sequence.

[0057] In this embodiment, the first sub-pixel 1, the second sub-pixel 2 and the third sub-pixel 3 can be, for example, a red sub-pixel, a green sub-pixel and a blue sub-pixel; therefore, the heating temperature of the mixture film in the red sub-pixel, the green sub-pixel and the blue sub-pixel during the first heating treatment is sequentially increased, and the heating temperature can be controlled at about 20-70°C for the above-selected materials. For example, the heating temperatures of the red sub-pixel, the green sub-pixel and the blue sub-pixel are sequentially about 30°C, 50°C, 70°C or 20°C, 40°C, 60°C, etc., so that the average pore size of the pores in the microcavity adjustment layer finally formed in the red sub-pixel, the green sub-pixel and the blue sub-pixel is sequentially reduced, and the porosity is sequentially increased, such as Figure 4C For example, the average pore size of the pores included in the microcavity adjustment layer in the red sub-pixel is about 700nm-1000nm, such as 800nm ​​or 900nm; the average pore size of the pores included in the microcavity adjustment layer in the green sub-pixel is about 300nm-700nm, such as 400nm or 500nm; the average pore size of the pores included in the microcavity adjustment layer in the blue sub-pixel is about 100nm-300nm, such as 200nm or 250nm.

[0058] In this embodiment, for example, the porosity and average pore size of the microcavity adjustment layer formed by adjusting the ratio of the first polymer material to the second polymer material in the mixture film can be adjusted.

[0059] For example, when the amount of the first polymer material with a greater solubility in the co-solvent is greater, the porosity included in the microcavity adjustment layer finally formed by the mixture film is greater and the average pore size is smaller. In this embodiment, the mass percentage of the first polymer material with a greater solubility in the co-solvent to the mixture of the first polymer material and the second polymer material can be, for example, about 40%-70%, such as 50%, 60%, etc. For example, when the selected first polymer material and the second polymer material are polystyrene and polymethyl methacrylate, and the extractant is tetrahydrofuran with a greater solubility in polystyrene and a smaller solubility in polymethyl methacrylate, the mass percentage of polystyrene in the mixture film can be, for example, about 40%-70%, and the more the amount of polystyrene in the mixture film, the smaller the average pore size of the pores included in the microcavity adjustment layer finally formed by the mixture film and the greater the porosity.

[0060] For another example, the dissolution and dispersion of the first polymer material and the second polymer material in the mixture can be controlled by controlling the mixing conditions of the first polymer material and the second polymer material with the co-solvent, such as the stirring rate, stirring temperature, etc., thereby adjusting the porosity and average pore size of the pores in the microcavity adjustment layer finally formed. For example, high-speed stirring, ultrasonic stirring, etc. can be used to uniformly mix the first polymer material and the second polymer material.

[0061] In this embodiment, the microcavity adjustment layer of the organic light emitting diode device has a lower light refractive index, and the microcavity adjustment layers with different average pore sizes and porosities can have different light refractive indices. For example, in one example, when the first electrode is close to the light-emitting side of the organic light emitting diode and the microcavity adjustment layer is located on the side of the first electrode away from the light-emitting layer, the light refractive index of the microcavity adjustment layer can be, for example, about 1.1-1.7, for example, the red sub-pixel, the green sub-pixel, and the blue sub-pixel are 1.2, 1.3 or 1.4, etc. respectively. The light refractive index of the organic light emitting diode device can be adjusted, for example, by controlling the average pore size and porosity in the microcavity adjustment layer to adjust the light refractive index, thereby adjusting the microcavity effect generated by the organic light emitting diode device. Experiments have shown that within a certain range, the light refractive index of the organic light emitting diode device decreases with the increase of the porosity in the microcavity adjustment layer, while the microcavity effect generated by the organic light emitting diode device increases with the decrease of the light refractive index.

[0062] In the method for manufacturing an organic light emitting diode device provided in this embodiment, after the microcavity adjustment layer is prepared, Figure 4D As shown, the first electrode 101 or the second electrode 102 is prepared on the microcavity adjustment layer 104, and then other structures such as the light-emitting layer 103 are prepared, which will not be described in detail in this embodiment.

[0063] The method for preparing an organic light-emitting diode device provided in this embodiment can be used to prepare an organic light-emitting diode device having a microcavity adjustment layer, and the method can adjust the average pore size and porosity of the pores included in the microcavity adjustment layer in different sub-pixels of the organic light-emitting diode device, thereby adjusting the microcavity effect generated by different sub-pixels of the organic light-emitting diode device, and finally achieving the technical effect of adjusting the color saturation of different colors of light in different sub-pixels of the organic light-emitting diode device. In addition, the method of this embodiment has a simple preparation process, low cost, and is suitable for large-scale production.

[0064] Embodiment 2

[0065] The present embodiment provides an organic light-emitting diode device, which is prepared by the method of the above embodiment. The organic light-emitting diode device has a microcavity adjustment layer including pores, and the average pore size and porosity of the pores included in the microcavity adjustment layer are adjusted, so that the microcavity adjustment layer including pores with different average pore sizes and porosities of different sub-pixels of the organic light-emitting diode device can be targeted to adjust the microcavity effect generated by different sub-pixels of the organic light-emitting diode device, for example, the microcavity effect generated by different sub-pixels of the organic light-emitting diode device, such as sub-pixels that can emit light of different colors, is adjusted differently, thereby adjusting the color saturation of different sub-pixels of the organic light-emitting diode device.

[0066] For example, when an organic light emitting diode device includes red sub-pixels, green sub-pixels, and blue sub-pixels, each of these sub-pixels has a microcavity adjustment layer including pores with different average pore sizes and porosities, which can respectively adjust the color saturation of the red, green, and blue colors of the organic light emitting diode device, thereby adjusting the average pore size and porosity of the pores of the microcavity adjustment layer in the organic light emitting diode device according to the color saturation required for a specific application of the organic light emitting diode device. For example, when the organic light emitting diode device uses the Adobe color gamut space, the green color saturation of the organic light emitting diode device should be higher, while the red color saturation can be lower. Therefore, the average pore size of the pores included in the microcavity adjustment layer of the green sub-pixel in the organic light emitting diode device can be increased and its porosity can be reduced to a certain extent, and the average pore size of the pores included in the microcavity adjustment layer of the red sub-pixel in the organic light emitting diode device can be reduced and its porosity can be increased, thereby enhancing the microcavity effect generated by the green sub-pixel in the organic light emitting diode device and reducing the microcavity effect generated by the red sub-pixel in the organic light emitting diode device, and ultimately making the green color saturation of the organic light emitting diode device higher, while the red color saturation is lower. For another example, when the organic light emitting diode device uses the DCI (Digital Cinema Initiatives) color gamut space, the red color saturation of the organic light emitting diode device should be higher, while the green color saturation can be lower. Therefore, the average pore size of the pores included in the microcavity adjustment layer of the red sub-pixel in the organic light emitting diode device can be increased to a certain extent, and its porosity can be reduced, while the average pore size of the pores included in the microcavity adjustment layer of the green sub-pixel in the organic light emitting diode device can be reduced, and its porosity can be increased, thereby enhancing the microcavity effect generated by the red sub-pixel in the organic light emitting diode device and reducing the microcavity effect generated by the green sub-pixel in the organic light emitting diode device, and ultimately making the red color saturation of the organic light emitting diode device higher, while the green color saturation is lower.

[0067] Embodiment 3

[0068] This embodiment provides an organic light emitting diode device, such as Figures 5A-6BAs shown, the device includes a plurality of pixels, each pixel includes at least two sub-pixels that generate light of different colors, the sub-pixel includes a first electrode 201, a second electrode 202, and a light-emitting layer 203 between the first electrode 201 and the second electrode 202; the sub-pixel also includes a microcavity adjustment layer 204 including pores located on the side of the first electrode 201 away from the light-emitting layer 203, and the porosity and average pore size of the pores of the microcavity adjustment layer 204 of the sub-pixels that generate light of different colors are different. For example, at least two sub-pixels that generate light of different colors include a first sub-pixel and a second sub-pixel, and the porosity and average pore size of the microcavity adjustment layer in the first sub-pixel are different from the porosity and average pore size of the microcavity adjustment layer in the second sub-pixel.

[0069] In this embodiment, Figure 5A As shown, the microcavity adjustment layer 204 can be located on the side of the first electrode 201 away from the light-emitting layer 203. The first electrode 201 can be, for example, an anode. At this time, the convex-concave structure of the pores on the surface of the microcavity adjustment layer makes the surface of the anode arranged thereon have a convex-concave structure, thereby forming a microcavity reflection surface with a certain degree of roughness, for example, forming microcavity reflection surfaces with different pore sizes and porosities and different degrees of roughness, thereby achieving the adjustment of the microcavity effect. Or as Figure 5B As shown, the microcavity adjustment layer 204 can be located on the side of the second electrode 202 away from the light-emitting layer 203. For example, the second electrode 202 is a cathode. At this time, the light emitted by the light-emitting layer 203 passes through the cathode and the microcavity adjustment layer in sequence before being emitted. The microcavity adjustment layer has a lower refractive index and its refractive index can be adjusted by adjusting the average pore size and porosity of the microcavity adjustment layer, thereby achieving the adjustment of the microcavity effect. In this embodiment, the positions of the first electrode 201 and the second electrode 202 can be interchanged, that is, as shown in Fig. 6A and Figure 6B In this embodiment, the specific positions of the first electrode 201 and the second electrode 202 are not limited.

[0070] In this embodiment, the average pore size and porosity of the pores included in the microcavity adjustment layer formed in different sub-pixels of the organic light-emitting diode device are different. For example, the organic light-emitting diode device includes at least two different sub-pixels, for example, it may include a first sub-pixel and a second sub-pixel, and the wavelength of light emitted by the organic light-emitting diode device in the first sub-pixel is greater than the wavelength of light emitted in the second sub-pixel; in this case, the average pore size of the pores included in the microcavity adjustment layer in the first sub-pixel may be, for example, greater than the average pore size of the pores included in the microcavity adjustment layer in the second sub-pixel, and the porosity of the pores included in the microcavity adjustment layer in the first sub-pixel may be, for example, less than the porosity of the pores included in the microcavity adjustment layer in the second sub-pixel.

[0071] For example, Figure 5AIn the illustrated case, the organic light emitting diode device shows three different sub-pixels, namely, the first sub-pixel 1, the second sub-pixel 2, and the third sub-pixel 3, and the average pore size and porosity of the pores included in the microcavity adjustment layer 104 formed in the three different sub-pixels are different. For example, when the wavelengths of light that can be emitted by the first sub-pixel 1, the second sub-pixel 2, and the third sub-pixel 3 corresponding to the parts of the organic light emitting diode device decrease in sequence, the average pore size of the pores in the microcavity adjustment layer formed in the three sub-pixels can, for example, decrease in sequence, and the porosity can increase in sequence.

[0072] In this embodiment, the first sub-pixel 1, the second sub-pixel 2 and the third sub-pixel 3 can be, for example, a red sub-pixel, a green sub-pixel and a blue sub-pixel, and the average pore size of the pores in the microcavity adjustment layer of the red sub-pixel, the green sub-pixel and the blue sub-pixel decreases and the porosity increases in sequence. For example, the average pore size of the pores included in the microcavity adjustment layer in the red sub-pixel is about 700nm-1000nm, such as 800nm ​​or 900nm; the average pore size of the pores included in the microcavity adjustment layer in the green sub-pixel is about 300nm-700nm, such as 400nm or 500nm; the average pore size of the pores included in the microcavity adjustment layer in the blue sub-pixel is about 100nm-300nm, such as 200nm or 250nm. Within a certain range, in a certain sub-pixel of the organic light-emitting diode device, the larger the average pore size of the pores of the microcavity adjustment layer and the smaller the porosity, the stronger the microcavity effect that the sub-pixel can produce, and thus the higher the color saturation of the light emitted by the sub-pixel.

[0073] In this embodiment, for example, the pore size of the microcavity adjustment layer in different sub-pixels of the organic light-emitting diode device can be selected according to the color saturation required by the specific application of the organic light-emitting diode device. For example, when the application scenario of the organic light-emitting diode device requires a higher red color saturation, an organic light-emitting diode device in which the red sub-pixel has a microcavity adjustment layer with a pore having a larger average pore size and a smaller porosity can be selected, for example, an organic light-emitting diode device having a microcavity adjustment layer with a pore having an average pore size of about 900nm can be selected, and the red sub-pixel in the device can produce a stronger microcavity effect when emitting light, so the red light color saturation emitted by the device is higher. For example, when the application scenario of the organic light-emitting diode device requires a higher green color saturation, an organic light-emitting diode device in which the green sub-pixel has a microcavity adjustment layer with a pore having a larger average pore size and a smaller porosity can be selected, for example, an organic light-emitting diode device having a microcavity adjustment layer with a pore having an average pore size of about 600nm can be selected, and the green sub-pixel in the device can produce a stronger microcavity effect when emitting light, so the green light color saturation emitted by the device is higher. For example, when the application scenario of the organic light emitting diode device requires a higher blue color saturation, an organic light emitting diode device in which the blue sub-pixel has a microcavity adjustment layer with pores having a larger average pore size and a smaller porosity can be selected. For example, an organic light emitting diode device in which the blue sub-pixel has a microcavity adjustment layer with pores having an average pore size of 250nm is selected. The blue sub-pixel in the device can produce a stronger microcavity effect when emitting light, so the blue light emitted by the device has a higher color saturation.

[0074] In this embodiment, the microcavity adjustment layer of the organic light emitting diode device has a relatively low refractive index, and its refractive index can be, for example, about 1.1-1.7, such as about 1.2, 1.3 or 1.4, and the refractive index of the organic light emitting diode device can be adjusted, for example, by controlling the average pore size and porosity of the pores in the microcavity adjustment layer to adjust the refractive index, thereby adjusting the microcavity effect generated by the organic light emitting diode device. Experiments have shown that within a certain range, the refractive index of the organic light emitting diode device decreases with the increase of the porosity in the microcavity adjustment layer and the decrease of the average pore size, while the microcavity effect generated by the organic light emitting diode device increases with the decrease of the refractive index.

[0075] In this embodiment, the organic light emitting diode device may be, for example, a top emission type or a bottom emission type organic light emitting diode device. This embodiment does not limit the type of the organic light emitting diode device.

[0076] In this embodiment, Figure 5A , Figure 5B , Fig. 6A , Figure 6BAs shown, the organic light emitting diode device may further include a substrate 205, a thin film transistor 206, a hole transport layer / hole injection layer 207, an electron transport layer / electron injection layer 208 and other structures, which are not limited in this embodiment.

[0077] Embodiment 4

[0078] This embodiment provides an organic light emitting diode display panel, which includes a plurality of pixels, and each pixel includes any of the organic light emitting diode devices described above. The display panel can select organic light emitting diode devices with different microcavity adjustment layers according to its application environment, so that the various colors of light emitted by the display panel can have different color saturation according to requirements.

[0079] The display panel can be used in any product or component with display function, such as mobile phones, tablet computers, televisions, monitors, notebook computers, digital photo frames, and navigators.

[0080] There are a few points to note:

[0081] (1) The drawings of the embodiments of the present disclosure only relate to the structures related to the embodiments of the present disclosure, and other structures may refer to the general design.

[0082] (2) For the sake of clarity, in the drawings used to describe the embodiments of the present disclosure, the thickness of layers or regions is exaggerated or reduced, that is, these drawings are not drawn according to the actual scale. It is understood that when an element such as a layer, film, region or substrate is referred to as being "on" or "under" another element, the element may be "directly" "on" or "under" the other element or there may be intermediate elements.

[0083] (3) In the absence of conflict, the embodiments of the present disclosure and the features therein may be combined with each other to obtain new embodiments.

[0084] The above is only a specific embodiment of the present disclosure, but the protection scope of the present disclosure is not limited thereto. Any person skilled in the art who is familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the present disclosure, which should be included in the protection scope of the present disclosure. Therefore, the protection scope of the present disclosure should be based on the protection scope of the claims.

Claims

1. A method for manufacturing an organic light emitting diode device, comprising: Forming a plurality of pixels, each pixel comprising at least two sub-pixels generating light of different colors, wherein the sub-pixels comprise a first electrode, a second electrode, and a light-emitting layer between the first electrode and the second electrode; The manufacturing method further includes forming a microcavity adjustment layer including pores on a side of the first electrode away from the light-emitting layer, wherein the pores of the microcavity adjustment layer of the sub-pixels generating light of different colors have different porosities and average pore sizes.

2. The method for manufacturing an organic light emitting diode device according to claim 1, wherein: The at least two sub-pixels generating light of different colors include a first sub-pixel and a second sub-pixel, and the forming of a microcavity adjustment layer including pores includes: mixing a first polymeric material and a second polymeric material with a co-solvent to form a mixture, wherein the solubility of the first polymeric material in the co-solvent is greater than the solubility of the second polymeric material in the co-solvent; The mixture is subjected to a film-forming process on a substrate to form a mixture film, wherein the film-forming process includes a first heating process; The mixture membrane is fully contacted with an extractant to form pores in the mixture membrane, and then a second heating treatment is performed to evaporate the extractant, wherein the extractant is a good solvent for the first polymer and a poor solvent for the second polymer; The heating temperatures for performing the first heating treatment on the first sub-pixel and the second sub-pixel are different, so that pores with different porosities and average pore diameters are formed in the mixture film after sufficient contact with the extractant.

3. The method for manufacturing an organic light emitting diode device according to claim 2, wherein: Infrared light is used to irradiate through mask plates with different transmittances corresponding to the first sub-pixel and the second sub-pixel, respectively, so that the heating temperatures of the first sub-pixel and the second sub-pixel during the heating treatment are different.

4. The method for manufacturing an organic light emitting diode device according to claim 2, wherein: The wavelength of light emitted by the first sub-pixel is greater than the wavelength of light emitted by the second sub-pixel. Accordingly, the heating temperature of the heating treatment performed on the first sub-pixel is lower than the heating temperature of the heating treatment performed on the second sub-pixel.

5. The method for manufacturing an organic light emitting diode device according to claim 4, wherein: The at least two sub-pixels generating light of different colors include three sub-pixels, and the three sub-pixels include a red sub-pixel, a green sub-pixel, and a blue sub-pixel. The heating temperatures of the microcavity adjustment layers in the red sub-pixel, the green sub-pixel, and the blue sub-pixel are sequentially increased during the heating treatment during the formation process.

6. The method for manufacturing an organic light emitting diode device according to claim 2, wherein: The first polymer material is one of polystyrene, polymethyl methacrylate, polyvinyl pyrrolidone and polyimide, and the second polymer material is another of polystyrene, polymethyl methacrylate, polyvinyl pyrrolidone and polyimide.

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