Organic light-emitting device, preparation method of organic light-emitting device and display device

Abstract

The invention discloses an organic light-emitting device, an organic light-emitting device preparation method and a display device. The organic light-emitting device comprises a substrate, a first electrode layer, an organic light-emitting layer and a second electrode layer, the first electrode layer is arranged on the surface of the substrate, the organic light-emitting layer is arranged on the side, away from the substrate, of the anode layer, and the second electrode layer is arranged on the side, away from the first electrode layer, of the organic light-emitting layer; the organic light-emitting layer comprises a light-emitting layer and a mixed regulation and control layer, and the mixed regulation and control layer is arranged on the side, away from the anode layer, of the light-emitting layer; wherein the materials of the mixed regulation and control layer comprise a first material and a second material which are mixed, and the properties of the first material and the second material are different; and the mixed regulation layer is used for regulating the luminous efficiency and the service life of the organic light-emitting device. According to the technical scheme, the light emitting efficiency of the organic light emitting device is improved, and the service life of the organic light emitting device is prolonged.

Description

Technical Field

[0001] The embodiments of the present invention relate to the field of display technology, and in particular to an organic light-emitting device, an organic light-emitting device preparation method and a display device. Background Art

[0002] With the development of science and technology, the application of mobile electronic devices such as smart phones and computers is becoming more and more widespread. As one of the main components of electronic devices, the display panel and the organic light-emitting diode (OLED) display device have good application prospects.

[0003] The OLED display device is a self-luminous display device with the characteristics of self-luminescence, simple structure, light and thin, fast response speed, wide viewing angle, low power consumption and flexible display. It is recognized as the next generation mainstream display device. In the OLED display device, there are two types of OLED light-emitting devices, namely phosphorescent OLED light-emitting devices and fluorescent OLED light-emitting devices. Among them, the limit of the internal quantum efficiency (IQE) of the phosphorescent OLED light-emitting device can reach 100%, while the internal quantum efficiency of the fluorescent OLED light-emitting device is lower. Both the red OLED light-emitting device and the green OLED light-emitting device use phosphorescent OLED light-emitting devices and can be commercialized. However, due to the short life of the blue phosphorescent OLED light-emitting device, the blue OLED light-emitting device still uses the fluorescent OLED light-emitting device. Although the life of the blue OLED light-emitting device can be appropriately extended, the luminous efficiency is low and cannot be commercialized.

[0004] Therefore, how to strike a balance between the luminous efficiency and lifespan of blue OLED light-emitting devices has become an urgent problem to be solved in the industry. Summary of the invention

[0005] The present invention provides an organic light emitting device, a method for preparing the organic light emitting device and a display device, so as to improve the light emitting efficiency of a blue OLED light emitting device and prolong the life of the blue OLED light emitting device.

[0006] According to one aspect of the present invention, there is provided an organic light emitting device, comprising:

[0007] substrate;

[0008] A first electrode layer disposed on the surface of the substrate;

[0009] an organic light-emitting layer, wherein the organic light-emitting layer is disposed on a side of the first electrode layer away from the substrate;

[0010] a second electrode layer, the second electrode layer being disposed on a side of the organic light-emitting layer away from the first electrode layer;

[0011] The organic light-emitting layer includes a light-emitting layer and a hybrid regulation layer, and the hybrid regulation layer is arranged on a side of the light-emitting layer away from the first electrode layer; wherein the material of the hybrid regulation layer includes a mixed first material and a second material, and the properties of the first material and the second material are different; the hybrid regulation layer is used to regulate the luminous efficiency and lifespan of the organic light-emitting device.

[0012] Optionally, the mass of the first material and the mass of the second material form a preset mass ratio, and the preset mass ratio ranges from 1:9 to 9:1.

[0013] Optionally, a HOMO energy level of the first material and a HOMO energy level of the second material form a HOMO energy level difference, and the HOMO energy level difference is less than 0.4 eV.

[0014] Optionally, the triplet energy of the first material and the triplet energy of the second material form a triplet energy difference, and the triplet energy difference is less than 0.1 eV.

[0015] Optionally, the first material includes 1,3,5-tribenzimidazole-phenyl derivatives, and the second material includes 4,7-diphenyl-1,10-phenanthroline derivatives.

[0016] Optionally, the thickness of the hybrid regulation layer ranges from 1 to 20 nm, and the thickness of the light-emitting layer ranges from 10 to 30 nm.

[0017] Optionally, the organic light-emitting layer further includes: a hole transport layer and an electron transport layer;

[0018] The hole transport layer is arranged on a side of the light-emitting layer close to the first electrode layer, and the electron transport layer is arranged on a side of the mixed regulation layer away from the light-emitting layer.

[0019] Optionally, the organic light-emitting layer further includes: a hole injection layer, wherein the hole injection layer is arranged on a side of the hole transport layer close to the first electrode layer;

[0020] and / or,

[0021] An electron blocking layer is disposed between the hole transport layer and the light emitting layer.

[0022] According to another aspect of the present invention, there is provided a method for preparing an organic light-emitting device, comprising:

[0023] providing a substrate;

[0024] forming a first electrode layer on the surface of the substrate;

[0025] A light-emitting layer is formed on a side of the first electrode layer away from the substrate, and a mixed regulation layer is formed on a side of the light-emitting layer away from the first electrode layer; the light-emitting layer and the mixed regulation layer form an organic light-emitting layer; wherein the material of the mixed regulation layer includes a mixed first material and a second material, and the properties of the first material and the second material are different; the mixed regulation layer is used to regulate the luminous efficiency and life of the organic light-emitting device;

[0026] A second electrode layer is formed on a side of the organic light emitting layer away from the first electrode layer.

[0027] Optionally, in the step of forming the organic light-emitting layer, the method for preparing the hybrid regulation layer includes:

[0028] After mixing the first material and the second material, vapor deposition is performed on a side of the light-emitting layer away from the first electrode layer to form the mixed regulation layer;

[0029] or,

[0030] The first material and the second material are separately and simultaneously deposited on a side of the light-emitting layer away from the first electrode layer, and are mixed during the deposition process to form the mixed regulation layer.

[0031] According to another aspect of the present invention, there is further provided a display device, comprising the organic light emitting device as described in any embodiment of the first aspect.

[0032] The organic light-emitting device provided by the embodiment of the present invention includes a substrate, a first electrode layer, an organic light-emitting layer and a second electrode layer. The organic light-emitting layer includes a light-emitting layer and a mixed control layer. The mixed control layer includes a mixed first material and a second material to form a mixed film layer, and the film layer of the first material and the film layer of the second material are not physically spliced. In addition, the first material and the second material in the mixed control layer have different properties, that is, the first material and the second material can be materials that are conducive to improving the luminous efficiency of the organic light-emitting device and materials that are conducive to extending the life of the organic light-emitting device, respectively, so that the mixed control layer can improve the luminous efficiency of the organic light-emitting device and also extend the life of the organic light-emitting device.

[0033] It should be understood that the contents described in this section are not intended to identify the key or important features of the embodiments of the present invention, nor are they intended to limit the scope of the present invention. Other features of the present invention will become easily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0035] Figure 1 is a schematic structural diagram of an organic light-emitting device provided according to an embodiment of the present invention;

[0036] Figure 2 is a schematic structural diagram of another organic light-emitting device provided according to an embodiment of the present invention;

[0037] Figure 3 is a schematic structural diagram of another organic light-emitting device provided according to an embodiment of the present invention;

[0038] Figure 4 is a schematic diagram of the structure of a component provided according to an embodiment of the present invention, Figure 4 The embodiments of the present invention provide;

[0039] Figure 5 is a schematic structural diagram of another organic light-emitting device provided according to an embodiment of the present invention;

[0040] Figure 6 is a life test curve diagram provided according to an embodiment of the present invention;

[0041] Figure 7 is a luminous efficiency test curve diagram provided according to an embodiment of the present invention;

[0042] Figure 8 is a schematic flow chart of a method for preparing an organic light-emitting device according to an embodiment of the present invention;

[0043] Fig. 9 is a schematic structural diagram corresponding to each step in a method for preparing an organic light-emitting device provided in an embodiment of the present invention;

[0044] Fig.10 is a schematic diagram of a display device provided according to an embodiment of the present invention. DETAILED DESCRIPTION

[0045] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0046] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0047] An embodiment of the present invention provides an organic light emitting device. Figure 1 The schematic diagram of the structure of an organic light-emitting device provided by an embodiment of the present invention is shown in FIG. Figure 1 As shown, the organic light emitting device includes: a substrate 10 , a first electrode layer 20 , an organic light emitting layer 30 and a second electrode layer 40 .

[0048] The first electrode layer 20 is disposed on the surface of the substrate 10 , the organic light emitting layer 30 is disposed on a side of the first electrode layer 20 away from the substrate 10 , and the second electrode layer 40 is disposed on a side of the organic light emitting layer 30 away from the first electrode layer 20 .

[0049] The organic light-emitting layer 30 includes a light-emitting layer 31 and a hybrid regulation layer 32, wherein the hybrid regulation layer 32 is arranged on a side of the light-emitting layer 31 away from the first electrode layer 20; wherein the material of the hybrid regulation layer 32 includes a mixed first material and a second material, and the properties of the first material and the second material are different; the hybrid regulation layer 32 is used to regulate the luminous efficiency and lifespan of the organic light-emitting device.

[0050] Exemplarily, the substrate 10 may be a glass substrate. The first electrode layer 20 may be an anode layer, and the second electrode layer 40 may be a cathode layer; or, the first electrode layer 20 may be a cathode layer, and the second electrode layer 40 may be an anode layer, which is not limited here. In an embodiment of the present invention, the first electrode layer 20 is an anode layer, and the second electrode layer 40 is a cathode layer. The first electrode layer 20 may be prepared by indium tin oxide (ITO), and the second electrode layer 40 may be prepared by metal aluminum.

[0051] It should be noted that the organic light-emitting device provided in the embodiment of the present invention is proposed to solve the problem that the luminous efficiency and life of the blue light-emitting device cannot be taken into account at the same time. Therefore, the material of the light-emitting layer 31 in the organic light-emitting layer 30 is a blue light-emitting material. The mixed control layer 32 is equivalent to the hole blocking layer in the organic light-emitting layer of the related art, which is used to limit the flow of holes in the organic light-emitting layer, thereby facilitating the improvement of the luminous efficiency of the organic light-emitting device. However, the hole blocking layer in the related art is generally prepared using an organic material. If the hole blocking layer is prepared using an organic material that is conducive to improving the luminous efficiency, the life of the obtained organic light-emitting device may be short; if the hole blocking layer is prepared using an organic material that is conducive to extending the life, the luminous efficiency of the obtained organic light-emitting device may be low. Therefore, the organic light-emitting device in the related art cannot take into account both the luminous efficiency and life. Based on this, the organic light-emitting device provided in the embodiment of the present invention uses the mixed control layer 32 as the hole blocking layer. Among them, the material of the mixed regulation layer 32 includes a mixed first material and a second material, that is, the mixed regulation layer 32 is a mixed film layer prepared by the first material and the second material, and in the mixed regulation layer 32, the molecules of the first material and the molecules of the second material form a certain connection. Therefore, the mixed regulation layer 32 is not a film layer of the first material and a film layer of the second material physically spliced ​​into one film layer.

[0052] Exemplarily, the first material and the second material have different properties, that is, the first material can be a material that is conducive to improving the luminous efficiency of the organic light-emitting device, and the second material is a material that is conducive to extending the life of the organic light-emitting device; or, the first material can also be a material that is conducive to extending the life of the organic light-emitting device, and the second material is a material that is conducive to improving the luminous efficiency of the organic light-emitting device, which is not limited here. By using two materials with different advantages to mix and form a hybrid regulation layer 32, the hybrid regulation layer 32 can regulate the luminous efficiency and life of the organic light-emitting device, which is conducive to improving the luminous efficiency of the organic light-emitting device and extending the life of the organic light-emitting device. Therefore, the organic light-emitting device prepared with the hybrid regulation layer 32 as a hole blocking layer can not only improve the luminous efficiency but also extend the life of the organic light-emitting device, which is conducive to the commercialization of blue OLED organic light-emitting devices.

[0053] The organic light-emitting device provided in the embodiment of the present invention includes a substrate 10, a first electrode layer 20, an organic light-emitting layer 30 and a second electrode layer 40. Among them, the organic light-emitting layer 30 includes a light-emitting layer 31 and a mixed regulation layer 32. The mixed regulation layer 32 includes a mixed first material and a second material to form a mixed film layer, and the film layer of the first material and the film layer of the second material are not physically spliced. And the first material and the second material in the mixed regulation layer 32 have different properties, that is, the first material and the second material can be materials that are conducive to improving the luminous efficiency of the organic light-emitting device and materials that are conducive to extending the life of the organic light-emitting device, so that the mixed regulation layer 32 can improve the luminous efficiency of the organic light-emitting device and also extend the life of the organic light-emitting device.

[0054] For the first material and the second material included in the hybrid control layer, certain conditions must be met when selecting the materials. The following embodiments will explain in detail the basis for selecting the first material and the second material.

[0055] Optionally, based on the above embodiment, the mass of the first material and the mass of the second material form a preset mass ratio, and the preset mass ratio ranges from 1:9 to 9:1.

[0056] Exemplarily, since the first material and the second material respectively have the effects of improving the luminous efficiency of the organic light-emitting material and extending the life of the organic light-emitting material, the luminous efficiency and life of the organic light-emitting material can be regulated by mixing the first material and the second material in a preset mass ratio. And the first material and the second material are mixed in different mass ratios, and the luminous efficiency and life of the organic light-emitting material are regulated differently, and different regulation effects will be obtained. Exemplarily, if the mass of the material that improves the luminous efficiency of the organic light-emitting material in the mixed regulation layer is greater than the mass of the material that extends the life, the luminous efficiency of the organic light-emitting device is improved more, while the life is improved less; conversely, if the mass of the material that improves the luminous efficiency of the organic light-emitting material in the mixed regulation layer is less than the mass of the material that extends the life, the life of the organic light-emitting device is improved more, while the luminous efficiency is improved less. Preferably, when the preset mass ratio formed by the mass of the first material and the mass of the second material is 5:5, the prepared organic light-emitting device can have both a good luminous efficiency improvement effect and a good life extension effect.

[0057] Optionally, based on the above embodiments, the HOMO energy level of the first material and the HOMO energy level of the second material form a HOMO energy level difference, and the HOMO energy level difference is less than 0.4 eV.

[0058] Exemplarily, the HOMO energy level is the orbit with the highest energy level among the electron-filled orbitals of a molecule, and may also be referred to as the highest occupied orbital. The HOMO energy level affects the transmission of electrons and the diffusion of holes, which will have a certain impact on the luminous efficiency of the organic light-emitting device. For the first material and the second material mixed in the hybrid regulation layer, when the HOMO energy extreme difference between the HOMO energy level of the first material and the HOMO energy level of the second material is within a range of less than 0.4 eV, electrons can transition from molecules of the first material to molecules of the second material, or electrons can transition from molecules of the second material to molecules of the first material. The hybrid regulation layer can effectively inhibit the diffusion of holes, reduce the barrier to electron transmission, and enhance the electron injection performance, which is beneficial to improving the luminous efficiency of the organic light-emitting device. In addition, when the HOMO energy level difference between the selected first material and the second material is within a range of less than 0.4 eV, the life of the organic light-emitting device can also be effectively improved.

[0059] Optionally, based on the above embodiments, the triplet energy of the first material and the triplet energy of the second material form a triplet energy difference, and the triplet energy difference is less than 0.1 eV.

[0060] Exemplarily, a triplet state is an excited state of a molecule. In the process of electron transition, accompanied by a change in the spin direction, there are two unpaired electrons at this time, and the net spin of the electron is not equal to zero, then the molecule is affected in the magnetic field and produces energy level splitting, and this excited state is called a triplet excited state. When the triplet energy difference between the triplet energy of the first material and the triplet energy of the second material is less than 0.1eV, the electron can transition from the molecule of the first material to the molecule of the second material, or the electron can transition from the molecule of the second material to the molecule of the first material. The mixed control layer is conducive to improving the transmission ability of electrons between the molecules of the first material and the molecules of the second material, reducing the barrier of electron injection, and improving the ability to inhibit hole diffusion, thereby helping to improve the luminous efficiency of the organic light-emitting device and extend the life of the organic light-emitting device. Exemplarily, for organic materials that meet the three material selection criteria in the above embodiments, the first material includes 1, 3, 5-tribenzimidazole-phenyl derivatives, and the second material includes 4,7-diphenyl-1,10-phenanthroline derivatives.

[0061] Optionally, based on the above embodiments, continue to refer to Figure 1 The thickness of the mixed regulation layer 32 ranges from 1 to 20 nm, and the thickness of the light emitting layer 31 ranges from 10 to 30 nm.

[0062] Exemplarily, the hybrid regulation layer 32 serves as a resonant cavity of the light-emitting layer 31, and the matching relationship between the thickness of the light-emitting layer 31 and the thickness of the hybrid regulation layer 32 affects the light-emitting position in the light-emitting layer 31. If the thickness of the hybrid regulation layer 32 is too large, the light-emitting position of the light-emitting layer 31 may be adjusted to the side close to the first electrode layer 20, resulting in an unsatisfactory effect of improving the light-emitting efficiency. When the thickness of the hybrid regulation layer 32 is in the range of 1 to 20 nm, and the thickness of the light-emitting layer 31 is in the range of 10 to 30 nm, the hybrid regulation layer 32 can adjust the light-emitting position of the light-emitting layer 31 to near the center of the light-emitting layer 31 in the film stacking direction, so that the light-emitting layer 31 reaches a better light-emitting position, which is beneficial to improving the light-emitting efficiency of the organic light-emitting device.

[0063] Optionally, Figure 2 FIG. 1 is a schematic diagram of the structure of another organic light-emitting device provided by an embodiment of the present invention. Figure 2 As shown, the organic light emitting layer 30 further includes: a hole transport layer 33 and an electron transport layer 34 .

[0064] The hole transport layer 33 is disposed on a side of the light emitting layer 31 close to the first electrode layer 20 , and the electron transport layer 34 is disposed on a side of the hybrid regulation layer 32 away from the light emitting layer 31 .

[0065] Exemplarily, the hole transport layer 33 allows the holes injected from the first electrode layer 20 to be transmitted through the hole transport layer 33 to the light-emitting layer 31, and blocks the electrons from the second electrode layer 40 so that they are not directly transmitted to the first electrode layer 20. The electron transport layer 34 allows the electrons injected from the second electrode layer 40 to be transmitted through the electron transport layer 34 to the light-emitting layer 31, and blocks the holes from the first electrode layer 20 so that they are not directly transmitted to the second electrode layer 40. Therefore, the materials selected for the hole transport layer 33 and the electron transport layer 34 are generally materials with high carrier mobility and can form a barrier between the hole transport layer 33 and the electron transport layer 34 to block the flow of electrons and holes, so that electrons and holes can be combined in the light-emitting layer 31 and emit light. Exemplarily, the material of the hole transport layer 33 can be selected from NPB, and the material of the electron transport layer 34 can be selected from triazine derivatives, which are not limited here. The thickness of the hole transport layer 33 may be in the range of 100 to 200 nm, and the thickness of the electron transport layer 34 may be in the range of 30 to 60 nm.

[0066] Optionally, Figure 3 is a schematic structural diagram of another organic light-emitting device provided by an embodiment of the present invention, Figure 4 is a schematic structural diagram of another organic light-emitting device provided by an embodiment of the present invention, Figure 5 FIG. 1 is a schematic diagram of the structure of another organic light-emitting device provided by an embodiment of the present invention. Figures 3 to 5The organic light emitting layer 30 further includes: a hole injection layer 35, the hole injection layer 35 is arranged on a side of the hole transport layer 33 close to the first electrode layer 20;

[0067] and / or, an electron blocking layer 36 , wherein the electron blocking layer 36 is disposed between the hole transport layer 33 and the light emitting layer 31 .

[0068] For example, in Figure 2 Based on the structure of the organic light-emitting device provided, the organic light-emitting layer 30 may further include a hole injection layer 35 and / or an electron blocking layer 36. That is, the structure of the organic light-emitting device may be Figure 2 Based on the structure of the organic light emitting device shown in FIG. 1 , only a hole injection layer 35 is added, such as Figure 3 or only increase the electron blocking layer 36, such as Figure 4 Alternatively, both the hole injection layer 35 and the electron blocking layer 36 are added, such as Figure 5 The structure shown is not limited here.

[0069] The hole injection layer 35 is used to make the work function of the first electrode layer 20 have a good match with the LUMO (Lowest Unoccupied Molecular Orbital) level, and the work function of the second electrode layer 40 is well matched with the HOMO level, so that electrons and holes can be smoothly transmitted from the corresponding electrode to the corresponding transport layer. Exemplarily, the material of the hole injection layer 35 can be molybdenum trioxide, which is not limited here. The electron blocking layer 36 is used to block the electrons transmitted from the first electrode layer 20 to the light-emitting layer 31, and allow the holes injected by the first electrode layer 20 to flow through, so that the holes emit light after combining with the electrons in the light-emitting layer 31. Exemplarily, the material of the electron blocking layer 36 can be a triphenylamine derivative, which is not limited here. The thickness of the hole injection layer 35 can range from 1 to 20 nm, and the thickness of the electron blocking layer 36 can range from 1 to 20 nm.

[0070] The structure of the organic light-emitting device provided in this embodiment is beneficial to promoting the combination of holes and electrons in the light-emitting layer 31 and emitting light by providing a hole transport layer 33, an electron transport layer 34, a hole injection layer 35 and / or an electron blocking layer 36.

[0071] An achievable embodiment provides an organic light-emitting device structure of an experimental example and an organic light-emitting device structure of a comparative example.

[0072] The organic light-emitting device structure of the experimental example includes a stacked glass substrate, an ITO electrode layer, a hole injection layer, a hole transport layer, an electron blocking layer, a light-emitting layer, a hybrid regulation layer, an electron transport layer and an aluminum electrode layer. The hole injection layer, the hole transport layer, the electron blocking layer, the light-emitting layer, the hybrid regulation layer and the electron transport layer form an organic light-emitting layer. In the process of preparing the organic light-emitting device structure of the experimental example, the glass substrate with the ITO film layer evaporated is subjected to photolithography treatment, and then washed with deionized water, ethanol, and deionized water in turn to remove dirt on the surface of the ITO electrode layer. Then, the organic light-emitting layer and the aluminum electrode layer are prepared by evaporation. In the organic light-emitting layer, the material of the hole injection layer is molybdenum trioxide with a thickness of 10nm; the material of the hole transport layer is NPB with a thickness of 150nm; the material of the electron blocking layer is a triphenylamine derivative with a thickness of 10nm; the material of the light-emitting layer is phenylpyrene derivatives doped with 9,10-dinaphthylanthracene derivatives, with a doping ratio of 2% and a thickness of 20nm; the material of the mixed regulation layer includes 1,3,5-tribenzimidazole-phenyl derivatives and 4,7-diphenyl-1,10-phenanthroline derivatives, with a mass ratio of 5:5 and a thickness of 10nm; the material of the electron transport layer is a triazine derivative.

[0073] The difference between the organic light-emitting device structure of the comparative example and the organic light-emitting device structure of the experimental example is that the material of the hybrid regulation layer in the organic light-emitting device structure of the comparative example only includes 1, 3, 5-tribenzimidazole-phenyl derivatives, and the thickness is 10nm. The other conditions are the same and will not be repeated here.

[0074] The life test of the organic light-emitting device structure of the experimental example and the organic light-emitting device structure of the comparative example was carried out. 2 Under the condition of room temperature, the organic light-emitting device structure of the experimental example and the organic light-emitting device of the comparative example are simultaneously lit. Figure 6 This is a life test curve diagram provided by an embodiment of the present invention. Figure 6 As shown, in the life test curve diagram, the horizontal axis is the lighting time of the organic light emitting device, in hours; the vertical axis is the brightness ratio of the organic light emitting device. Figure 6 The solid line 01 in the figure is the life span variation curve of the organic light emitting device of the experimental example, and the dotted line 02 is the life span variation curve of the organic light emitting device of the comparative example. Figure 6 It can be seen that when the lighting time is 150h, the brightness of the organic light-emitting device of the experimental example decays to 99.57%, and the brightness of the organic light-emitting device of the comparative example decays to 97.9%. It can be seen that the life of the organic light-emitting device of the experimental example and the organic light-emitting device of the comparative example when the brightness decays to 95% is increased by about 1.5 times.

[0075] The luminous efficiency of the organic light-emitting device structure of the experimental example and the organic light-emitting device structure of the comparative example was tested. The organic light-emitting device structure of the experimental example and the organic light-emitting device structure of the comparative example were simultaneously lit at different brightnesses to test the corresponding luminous efficiency. Figure 7 is a luminous efficiency test curve provided by an embodiment of the present invention. Figure 7 As shown in the luminous efficiency test curve, the horizontal axis is the brightness of the organic light-emitting device, the unit is cd / m 2 ; The vertical axis is the luminous efficiency of the organic light-emitting device. Figure 7 The solid line 03 in the figure is the luminous efficiency variation curve of the organic light-emitting device of the experimental example, and the dotted line 04 is the luminous efficiency variation curve of the organic light-emitting device of the comparative example. Figure 7 It can be seen that the luminous efficiency of the organic light-emitting device structure of the experimental example is significantly improved compared with the organic light-emitting device structure of the comparative example.

[0076] In summary, the organic light-emitting device made of a mixed control layer formed by a first material and a second material with different properties can effectively improve the light-emitting efficiency and prolong the life.

[0077] The embodiment of the present invention also provides a method for preparing an organic light-emitting device. Figure 8 is a schematic flow chart of a method for preparing an organic light-emitting device provided in an embodiment of the present invention, Fig. 9 1 is a schematic diagram of the structure corresponding to each step in a method for preparing an organic light-emitting device provided in an embodiment of the present invention. Figure 8 and Fig. 9 , the method for preparing an organic light-emitting device comprises:

[0078] S110 , providing a substrate 10 .

[0079] Illustratively, the substrate may be a glass substrate.

[0080] S120 , forming a first electrode layer 20 on the surface of the substrate 10 .

[0081] Exemplarily, a first electrode material is evaporated on the surface of the substrate to form a first electrode film layer. The first electrode material may be indium tin oxide. The first electrode film layer is patterned to form a metal trace with a specific pattern, thereby forming the first electrode layer.

[0082] S130, forming a light-emitting layer 31 on a side of the first electrode layer 20 away from the substrate 10, and forming a mixed regulation layer 32 on a side of the light-emitting layer 31 away from the first electrode layer 20; the light-emitting layer 31 and the mixed regulation layer 32 form an organic light-emitting layer 30; wherein the material of the mixed regulation layer 32 includes a mixed first material and a second material, and the properties of the first material and the second material are different; the mixed regulation layer 32 is used to regulate the luminous efficiency and lifespan of the organic light-emitting device.

[0083] For example, the light-emitting layer is formed by evaporation on the side of the first electrode layer away from the substrate, and the mixed regulation layer is formed by evaporation on the side of the light-emitting layer away from the first electrode layer. The mixed regulation layer includes a first material and a second material with different properties, which can regulate the luminous efficiency and life of the organic light-emitting device.

[0084] S140 , forming a second electrode layer 40 on a side of the organic light-emitting layer 30 away from the first electrode layer 20 .

[0085] Exemplarily, the second electrode film layer is formed by evaporation on a side of the organic light-emitting layer away from the first electrode layer, and the second electrode film layer is patterned to form a metal trace with a specific pattern, thereby forming the second electrode layer.

[0086] In the method for preparing an organic light-emitting device provided in an embodiment of the present invention, a light-emitting layer is formed on a side of a first electrode layer away from a substrate, and a mixed control layer is formed on a side of the light-emitting layer away from the first electrode layer. The mixed control layer includes a first material and a second material mixed and having different properties, so that the mixed control layer can control the luminous efficiency and life of the prepared organic light-emitting device, thereby achieving the effect of improving the luminous efficiency of the organic light-emitting device and extending the life of the organic light-emitting device.

[0087] Optionally, based on the above embodiment, the method for preparing the hybrid control layer in step S130 specifically includes the following steps:

[0088] S131, after mixing the first material and the second material, evaporating the mixed regulating layer on a side of the light-emitting layer away from the first electrode layer;

[0089] Alternatively, the first material and the second material are separately and simultaneously deposited on a side of the light-emitting layer away from the first electrode layer, and are mixed during the deposition process to form a mixed regulation layer.

[0090] Exemplarily, the method of forming a mixed control layer by evaporation may include the following two methods: one is to mix the first material and the second material first, and then evaporate the mixed material to form a film layer on the side of the light-emitting layer away from the first electrode layer, i.e., the mixed control layer. Specifically, the first material and the second material may be fully ground, and the powder of the first material and the powder of the second material may be evenly mixed in a certain volume ratio to obtain a mixed material for evaporation; or, the first material and the second material may be dissolved in the same solvent, and the solute in the solvent may be extracted to obtain a mixed material for evaporation. The other method is to place the first material and the second material in separate boats for evaporation, and then separately control the evaporation rate and evaporation temperature of the corresponding materials in each boat, so that the first material and the second material evaporate at the same time and are deposited on the side of the light-emitting layer away from the first electrode layer to form a mixed control layer.

[0091] The preparation method of the hybrid regulation layer provided in this embodiment can form a mixed film layer, that is, a hybrid regulation layer, by first mixing the first material and the second material and then vapor-depositing them, or by vapor-depositing the first material and the second material at the same time, so that the hybrid regulation layer can regulate the luminous efficiency and life of the organic light-emitting device.

[0092] An embodiment of the present invention further provides a display device. Fig.10 Schematic diagram of a display device provided by an embodiment of the present invention. Fig.10 As shown, the display device includes the organic light emitting device provided by any of the above embodiments. Exemplarily, the organic light emitting device is an OLED organic light emitting device.

[0093] The organic light-emitting device included in the display device includes a substrate, a first electrode layer, an organic light-emitting layer and a second electrode layer. The organic light-emitting layer includes a light-emitting layer and a mixed control layer. The mixed control layer includes a first material and a second material mixed with different properties, and the mixed control layer is used as a hole blocking layer in the organic light-emitting layer, so that the mixed control layer can control the light-emitting efficiency and life of the organic light-emitting device, thereby achieving the effect of improving the light-emitting efficiency of the organic light-emitting device and extending the life of the organic light-emitting device.

[0094] The above specific implementations do not constitute a limitation on the protection scope of the present invention. It should be understood by those skilled in the art that various modifications, combinations, sub-combinations and substitutions can be made according to design requirements and other factors. Any modification, equivalent substitution and improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. An organic light-emitting device, characterized in that: include: substrate; A first electrode layer disposed on the surface of the substrate; an organic light-emitting layer, wherein the organic light-emitting layer is disposed on a side of the first electrode layer away from the substrate; a second electrode layer, the second electrode layer being disposed on a side of the organic light-emitting layer away from the first electrode layer; The organic light-emitting layer includes a light-emitting layer and a hybrid regulation layer, and the hybrid regulation layer is arranged on a side of the light-emitting layer away from the first electrode layer; wherein the material of the hybrid regulation layer includes a mixed first material and a second material, and the properties of the first material and the second material are different; the hybrid regulation layer is used to regulate the luminous efficiency and lifespan of the organic light-emitting device.

2. The organic light-emitting device according to claim 1, characterized in that: The mass of the first material and the mass of the second material form a preset mass ratio, and the preset mass ratio ranges from 1:9 to 9:

1.

3. The organic light-emitting device according to claim 1, characterized in that: The HOMO energy level of the first material and the HOMO energy level of the second material form a HOMO energy level difference, and the HOMO energy level difference is less than 0.4 eV.

4. The organic light-emitting device according to claim 1, characterized in that: The triplet energy of the first material and the triplet energy of the second material form a triplet energy difference, and the triplet energy difference is less than 0.1 eV.

5. The organic light-emitting device according to claim 2, 3 or 4, characterized in that: The first material includes 1, 3, 5-tribenzimidazole-phenyl derivatives, and the second material includes 4, 7-diphenyl-1, 10-phenanthroline derivatives.

6. The organic light emitting device according to claim 5, characterized in that: The thickness of the hybrid regulation layer ranges from 1 to 20 nm, and the thickness of the light-emitting layer ranges from 10 to 30 nm.

7. The organic light-emitting device according to claim 1, characterized in that: The organic light-emitting layer further includes: a hole transport layer and an electron transport layer; The hole transport layer is arranged on a side of the light-emitting layer close to the first electrode layer, and the electron transport layer is arranged on a side of the mixed regulation layer away from the light-emitting layer.

8. The organic light-emitting device according to claim 7, characterized in that: The organic light-emitting layer further includes: a hole injection layer, wherein the hole injection layer is disposed on a side of the hole transport layer close to the first electrode layer; and / or, An electron blocking layer is disposed between the hole transport layer and the light emitting layer.

9. A method for preparing an organic light-emitting device, characterized in that: include: providing a substrate; forming a first electrode layer on the surface of the substrate; A light-emitting layer is formed on a side of the first electrode layer away from the substrate, and a mixed regulation layer is formed on a side of the light-emitting layer away from the first electrode layer; the light-emitting layer and the mixed regulation layer form an organic light-emitting layer; wherein the material of the mixed regulation layer includes a mixed first material and a second material, and the properties of the first material and the second material are different; the mixed regulation layer is used to regulate the luminous efficiency and life of the organic light-emitting device; A second electrode layer is formed on a side of the organic light emitting layer away from the first electrode layer.

10. The method for preparing an organic light-emitting device according to claim 9, characterized in that: In the step of forming the organic light-emitting layer, the method for preparing the hybrid regulating layer includes: After mixing the first material and the second material, vapor deposition is performed on a side of the light-emitting layer away from the first electrode layer to form the mixed regulation layer; or, The first material and the second material are separately and simultaneously deposited on a side of the light-emitting layer away from the first electrode layer, and are mixed during the deposition process to form the mixed regulation layer.

11. A display device, characterized in that: The organic light-emitting device comprises the organic light-emitting device as claimed in any one of claims 1 to 8.

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