Organic electroluminescent devices, their fabrication and driving methods, and display panels

Abstract

This invention discloses an organic electroluminescent device (OLED), its fabrication method, driving method, and display panel. The OLED includes a first electrode and a second electrode; a light-emitting functional layer located between the first and second electrodes, comprising a light-emitting layer composed of at least two light-emitting elements. The light-emitting layer includes a first sub-pixel region, a second sub-pixel region, and a third sub-pixel region. The first, second, and third sub-pixel regions emit one of red, green, and blue light, respectively. At least two of the first, second, and third sub-pixel regions are provided with a first light-emitting element. The first light-emitting element emits at least two monochromatic lights under different voltages, one of which is blue light. This OLED has advantages such as comprehensive color display, uniform display, excellent image quality, long lifespan, simple fabrication process, and low cost.

Description

Technical Field

[0001] This invention relates to the field of display technology, specifically to organic electroluminescent devices, their fabrication and driving methods, and display panels. Background Technology

[0002] Unlike traditional liquid crystal displays (LCDs), organic light-emitting diode (OLED) displays do not require a backlight. Instead, they use an extremely thin coating of organic material that emits light when an electric current passes through it, thus creating a display. Furthermore, OLED displays can be made lighter and thinner, have wider viewing angles, and significantly reduce power consumption. In addition, OLED displays, coated with organic light-emitting materials, offer advantages such as high brightness, high luminous efficiency, and the ability to be bent due to their flexible substrates.

[0003] Currently, OLED display technology uses three primary color organic molecules to form pixels. This method can easily achieve the display of all colors, but the blue luminescent organic molecules decay preferentially, leading to problems such as incomplete and uneven color display and abnormal image quality.

[0004] Therefore, current organic electroluminescent devices still need improvement. Summary of the Invention

[0005] The present invention aims to at least partially solve one of the technical problems in the related art.

[0006] Therefore, in one aspect, the present invention proposes an organic electroluminescent device. The organic electroluminescent device includes: a first electrode and a second electrode; a light-emitting functional layer located between the first electrode and the second electrode, the light-emitting functional layer including a light-emitting layer composed of at least two light emitters, the light-emitting layer including a first sub-pixel region, a second sub-pixel region, and a third sub-pixel region, the first sub-pixel region, the second sub-pixel region, and the third sub-pixel region emitting one of red light, green light, and blue light respectively, at least two of the first sub-pixel regions being provided with a first light emitter, the first light emitter emitting at least two monochromatic lights under different voltages, and one of the monochromatic lights being blue light. This improves the problems of incomplete and uneven color display and abnormal image quality caused by the preferential decay of blue organic small molecules, extends the lifespan of the device, optimizes the stability of the device, and, since the light-emitting layer is formed by at least two organic small molecule light emitters, it can reduce one or even two vapor deposition processes, reduce the occurrence of potential defects, and reduce process complexity.

[0007] Furthermore, the first sub-pixel area and the second sub-pixel area are provided with the first light emitter, which emits two monochromatic lights under different voltages, and the third sub-pixel area is provided with the second light emitter, which emits one monochromatic light.

[0008] Furthermore, the second light emitter emits green light, while the first light emitter emits blue or red light under different voltages.

[0009] Furthermore, the material constituting the first luminescent body is prepared by a click reaction of a tertiary amine hydroxyl monomer and an activated alkyne.

[0010] Furthermore, the material constituting the first light emitter includes at least one of (2E)-3-[2-(dimethylamino)ethoxy]propionic acid-2-enoic acid methyl ester, (2E)-3-[2-(diethylamino)ethoxy]propionic acid-2-enoic acid methyl ester, and (2E)-3-[2-(dimethylamino)ethoxy]propionic acid-2-enoic acid ethyl ester.

[0011] Furthermore, the second light emitter emits red light, while the first light emitter emits blue or green light under different voltages.

[0012] Furthermore, the material constituting the first luminescent body is obtained by combining copper ions with fluorescein or a derivative of fluorescein.

[0013] Furthermore, the material constituting the first luminescent body includes at least one of copper chlorophyll, copper isothiocyanate fluorescein, and copper carboxynaphthalene fluorescein.

[0014] In another aspect, the present invention provides a display panel comprising the aforementioned organic electroluminescent device. Thus, this display panel possesses all the features and beneficial effects of the organic electroluminescent device described above, which will not be repeated here. In general, this display panel has advantages such as comprehensive color display, uniform display, excellent image quality, long service life, simple manufacturing process, and low cost.

[0015] In another aspect, the present invention provides a method for fabricating an organic electroluminescent device. The method includes: forming a light-emitting functional layer on a first electrode, the light-emitting functional layer including a light-emitting layer formed by vapor deposition of at least two light-emitting materials; the light-emitting layer including a first sub-pixel region, a second sub-pixel region, and a third sub-pixel region, the first sub-pixel region, the second sub-pixel region, and the third sub-pixel region emitting one of red light, green light, and blue light respectively; at least two of the first sub-pixel regions, the second sub-pixel region, and the third sub-pixel region being provided with a first light-emitting body; the first light-emitting body emitting at least two monochromatic lights under different voltages, one of which is blue light; and forming a second electrode on the side of the light-emitting functional layer away from the first electrode. This method has the advantage of simple process, and the organic electroluminescent device fabricated by this method has advantages such as comprehensive color display, uniform display, excellent image quality, long service life, and low cost.

[0016] In another aspect, the present invention provides a method for driving the aforementioned organic electroluminescent device. The method includes applying voltages to light emitters in a first sub-pixel region, a second sub-pixel region, and a third sub-pixel region, causing each sub-pixel region to emit one of red, green, or blue light, respectively. Different voltages are applied to the first light emitters located in different sub-pixel regions. This method can extend the lifespan of the organic electroluminescent device and improve its display quality and stability.

[0017] Furthermore, after a predetermined time, the voltage applied to the first light emitter emitting blue light and the first light emitter emitting red light is changed, or the voltage applied to the first light emitter emitting blue light and the first light emitter emitting green light is changed.

[0018] Furthermore, the first sub-pixel region and the second sub-pixel region are provided with the first light emitter, and the third sub-pixel region is provided with the second light emitter. The second light emitter emits green light, the first light emitter emits blue light under a first voltage, and the first light emitter emits red light under a second voltage, wherein the first voltage is higher than the second voltage; or, the second light emitter emits red light, the first light emitter emits blue light under a third voltage, and the first light emitter emits green light under a fourth voltage, wherein the third voltage is higher than the fourth voltage. Attached Figure Description

[0019] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the following description of the embodiments will be briefly introduced. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 A schematic diagram of an organic electroluminescent device according to an embodiment of the present invention is shown;

[0021] Figure 2 A schematic diagram of an organic electroluminescent device according to another embodiment of the present invention is shown;

[0022] Figure 3 This shows a schematic diagram of the structure of an organic electroluminescent device in the prior art;

[0023] Figure 4 This shows a schematic diagram of another organic electroluminescent device in the prior art;

[0024] Figure 5 A schematic diagram of the structure of a display panel according to an embodiment of the present invention is shown;

[0025] Figure 6 A schematic flowchart of a method for fabricating an organic electroluminescent device according to an embodiment of the present invention is shown.

[0026] Figure label:

[0027] 100: First electrode; 200: Second electrode; 300: Light-emitting functional layer; 311: First light emitter; 312: Second light emitter; 400: Pixel driving substrate; 500: Encapsulation layer; 10: Red light emitter; 20: Green light emitter; 21: First green light emitter; 22: Second green light emitter; 30: Blue light emitter; 1: First sub-pixel area; 2: Second sub-pixel area; 3: Third sub-pixel area. Detailed Implementation

[0028] The embodiments of the present invention are described in detail below. The embodiments described below are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention. Where specific techniques or conditions are not specified in the embodiments, they shall be performed in accordance with the techniques or conditions described in the literature in the art or in accordance with the product manual.

[0029] This invention is based on the inventor's discoveries and understanding of the following facts and problems:

[0030] In existing organic electroluminescent devices, pixels are typically composed of three independent light-emitting elements, as shown in the reference. Figure 3The pixels are composed of three primary color sub-pixels: red light emitter 10, green light emitter 20, and blue light emitter 30, enabling the device to display all colors. While the technology of forming RGB sub-pixels using three organic small molecules offers high brightness, it suffers from difficulties in vapor deposition alignment and requires three vapor deposition processes, leading to reduced efficiency. Furthermore, because blue photons have higher energy, they are prone to causing decay of organic small molecules, resulting in abnormalities in the pixels containing blue light emitters. This, in turn, leads to problems such as abnormal image quality, reduced lifespan, and insufficient color contrast and saturation.

[0031] The inventors discovered that although there are currently techniques for attenuating red and green organic molecules to achieve synchronous reduction in color brightness with blue organic molecules, thus minimizing the impact on the device's full-color display, these techniques increase process complexity and introduce more potential defects, such as controlling the timing of red and green organic molecule attenuation, setting the attenuation frequency, and configuring the laser source for attenuation. Furthermore, while existing technologies have addressed the aforementioned problems caused by the co-frequency attenuation of red, green, and blue organic molecules—specifically by depositing a high-efficiency, stable, and pure green organic molecule on top of the three primary colors—such as... Figure 4 As shown, the pixel is composed of four primary color sub-pixels: red light emitter 10, first green light emitter 21, second green light emitter 22, and blue light emitter 30. However, this technology adds an evaporation process, and the presence of the four organic small molecules can lead to potential defects, such as the alignment complexity of the evaporation.

[0032] In summary, current organic electroluminescent devices suffer from problems such as incomplete and uneven color display and abnormal image quality due to the preferential decay of blue organic molecules; complex processes and numerous potential defects due to the co-frequency decay of red, green and blue organic molecules; and the need to add an extra evaporation process, increase potential defects, and address the issues of the diversity of organic molecules and the integration of technologies caused by the evaporation of four types of organic molecules.

[0033] Therefore, in one aspect of the present invention, an organic electroluminescent device is provided. In some embodiments of the present invention, reference is made to… Figure 1The organic electroluminescent device includes a first electrode 100, a second electrode 200, and a light-emitting functional layer 300. The light-emitting functional layer 300 is located between the first electrode 100 and the second electrode 200. The light-emitting functional layer 300 includes a light-emitting layer (i.e., the film layer in which the first light emitter 311 and the second light emitter 312 are located in the figure). The light-emitting layer is composed of at most two types of light emitters. The light-emitting layer includes a first sub-pixel region 1, a second sub-pixel region 2, and a third sub-pixel region 3. The first sub-pixel region 1, the second sub-pixel region 2, and the third sub-pixel region 3 emit one of red light, green light, and blue light, respectively. At least two of the first sub-pixel regions 1, the second sub-pixel region 2, and the third sub-pixel region 3 are provided with the first light emitter 311. The first light emitter 311 emits at least two monochromatic lights under different voltages, and one of the monochromatic lights is blue light. That is, the light-emitting layer is composed of at most two kinds of organic small molecule light emitters, at least two sub-pixel areas share one light emitter, and the light emitters set in the three sub-pixel areas can make the three sub-pixel areas emit one of red light, green light and blue light respectively. The pixel points of RGB three primary color sub-pixels are composed of at most two kinds of light emitters.

[0034] The first light emitter emits at least two monochromatic lights under different voltages, one of which is blue light. Specifically, the first light emitter can emit red, green, or blue light under different voltages, or it can emit blue or red light under different voltages, or it can emit blue or green light under different voltages. The unused blue light from the first light emitter emitting red or green light, and the unused red or green light from the first light emitter emitting blue light, can be emitted by adjusting the voltage. This reconstructs the red, green, and blue primary color pixels, improving the problems of incomplete, uneven, and abnormal color display caused by the preferential decay of blue organic molecules. This extends the device's lifespan, optimizes its stability, and since the light-emitting layer is formed by at most two organic small molecule light emitters, it can reduce one or even two vapor deposition processes, reduce potential defects, and lower process complexity.

[0035] When the first light emitter emits red, green, or blue light under different voltages, the light-emitting layer is composed of a small organic molecule light emitter. In this case, the first, second, and third sub-pixel regions each contain a first light emitter. By applying different voltages, the first light emitters in the first, second, and third sub-pixel regions emit red, green, and blue light respectively, thus achieving color display. Furthermore, by swapping the voltages applied to the blue-emitting and red-emitting first light emitters, unused red light from the blue-emitting first light emitter and unused blue light from the red-emitting first light emitter are emitted. Alternatively, swapping the voltages applied to the blue-emitting and green-emitting first light emitters allows unused green light from the blue-emitting first light emitter and unused blue light from the green-emitting first light emitter to be emitted, thereby reconstructing the red, green, and blue primary color pixels, improving problems such as incomplete or uneven color display and abnormal image quality, and extending the device's lifespan.

[0036] In some preferred embodiments of the present invention, the first light emitter emits two monochromatic lights under different voltages, one of which is blue light. In this case, the light-emitting layer is composed of two organic small molecule light emitters. The first sub-pixel region 1 and the second sub-pixel region 2 are provided with the first light emitter 311, and the third sub-pixel region 3 is provided with the second light emitter 312 (e.g., ...). Figure 1 and Figure 2 As shown, the second light emitter 312 emits a single monochromatic light. Organic small molecules that emit two monochromatic lights at different voltages are more readily available and have a greater cost advantage. The specific arrangement of the first, second, and third sub-pixel regions is not particularly limited; those skilled in the art can design it according to specific circumstances.

[0037] In some specific embodiments of the present invention, reference is made to... Figure 1The second light emitter 312 in the third sub-pixel region 3 emits green light, while the first light emitters 311 in the first sub-pixel region 1 and the second sub-pixel region 2 emit blue or red light under different voltages. By applying different voltages to the first light emitters in the first and second sub-pixel regions, the first sub-pixel region emits blue light and the second sub-pixel region emits red light, or vice versa, and applying a voltage to the second light emitter in the third sub-pixel region emits green light, thus enabling the device to display colors. Furthermore, by changing the voltages applied to the blue-emitting and red-emitting first light emitters, the unused red light from the blue-emitting first light emitter is emitted, and the unused blue light from the red-emitting first light emitter is emitted, thereby reconstructing the red, green, and blue primary color pixels, improving the problems of incomplete and uneven color display and abnormal image quality, and extending the lifespan of the device. The material of the green-emitting second light emitter in this embodiment is not particularly limited; those skilled in the art can choose commonly used green organic small molecule materials to constitute the second light emitter.

[0038] In some embodiments of the present invention, for a first light emitter that emits blue or red light under different voltages, the material constituting the first light emitter can be prepared by a click reaction of a tertiary amine hydroxyl monomer and an activated alkyne. Preferably, the material constituting the first light emitter may include at least one of (2E)-3-[2-(dimethylamino)ethoxy]propionic acid-2-enoic acid methyl ester, (2E)-3-[2-(diethylamino)ethoxy]propionic acid-2-enoic acid methyl ester, and (2E)-3-[2-(dimethylamino)ethoxy]propionic acid-2-enoic acid ethyl ester. These materials are readily available and can emit blue or red light under different voltages, offering advantages such as low cost and stable performance.

[0039] The aforementioned materials exhibit a redshift characteristic in excitation wavelength, meaning that as the excitation wavelength increases, the emission wavelength shifts towards longer wavelengths. Under relatively high voltages, i.e., with a larger driving energy, the small conjugation effect of individual π bonds (in other words, small π-π conjugation effect, rather than large π bonds) causes the first emitting element to emit blue light. Conversely, under relatively low voltages, i.e., with a smaller driving energy, the molecular chains intertwine, causing energy transfer and resulting in a smaller band gap in the organic small molecules, thus causing the first emitting element to emit red light.

[0040] In other specific embodiments of the present invention, reference is made to... Figure 2The second light emitter 312 in the third sub-pixel region 3 emits red light, while the first light emitters 311 in the first sub-pixel region 1 and the second sub-pixel region 2 emit blue or green light under different voltages. By applying different voltages to the first light emitters in the first and second sub-pixel regions, the first sub-pixel region emits blue light and the second sub-pixel region emits green light, or vice versa, and applying a voltage to the second light emitter in the third sub-pixel region emits red light, thus enabling the device to display colors. Furthermore, by changing the voltages applied to the blue-emitting and green-emitting first light emitters, the unused green light from the blue-emitting first light emitter is emitted, and the unused blue light from the green-emitting first light emitter is emitted, thereby reconstructing the red, green, and blue primary color pixels, improving the problems of incomplete and uneven color display and abnormal image quality, and extending the lifespan of the device. The constituent material of the red-emitting second light emitter in this embodiment is not particularly limited; those skilled in the art can choose commonly used red organic small molecule materials to constitute the second light emitter.

[0041] In some embodiments of the present invention, for a first light emitter that emits blue or green light under different voltages, the material constituting the first light emitter can be obtained by combining copper ions with fluorescein or a derivative of fluorescein. Preferably, the material constituting the first light emitter may include at least one of copper chlorophyll, copper isothiocyanate fluorescein, and copper carboxynaphthalene fluorescein. These materials are more readily available and can emit blue or green light under different voltages, offering advantages such as low cost and stable performance.

[0042] At relatively high voltages, where the energy required for multiple colors to form white light is met, the copper ions absorb the yellow light in the white light and exhibit a coordination effect (i.e., dd transition) that causes the first luminescent body to emit blue light. Conversely, at relatively low voltages, where only the energy required for monochromatic light is met, the large π bond of the green fluorophore (i.e., π-π conjugation effect) causes the first luminescent body to emit green light.

[0043] The light-emitting functional layer 300 further includes a hole injection layer, a hole transport layer, an electron transport layer, and an electron injection layer (not shown in the figure). The hole injection layer is located between the first electrode and the light-emitting layer; the hole transport layer is located between the hole injection layer and the light-emitting layer; the electron transport layer is located between the light-emitting layer and the second electrode; and the electron injection layer is located between the electron transport layer and the second electrode. The specific materials of the first electrode, the second electrode, and the hole injection layer, hole transport layer, electron transport layer, and electron injection layer are not particularly limited, and those skilled in the art can design them based on commonly used materials for the aforementioned films.

[0044] In another aspect, the present invention provides a display panel. This display panel includes the organic electroluminescent device described above. Thus, the display panel possesses all the features and beneficial effects of the organic electroluminescent device described above, which will not be repeated here. In general, this display panel has advantages such as comprehensive color display, uniform display, excellent image quality, long service life, simple manufacturing process, and low cost.

[0045] In some embodiments of the present invention, reference is made to Figure 5 The display panel may include a pixel driving substrate 400, an organic electroluminescent device, and an encapsulation layer 500. The organic electroluminescent device is disposed on the pixel driving substrate 400. The first electrode 100 is disposed close to the pixel driving substrate 400. The encapsulation layer 500 is disposed on the side of the organic electroluminescent device away from the pixel driving substrate 400. The encapsulation layer 500 is disposed close to the second electrode 200.

[0046] There are no special requirements for the specific type of display device using this display panel. Those skilled in the art can choose flexibly according to actual needs. For example, the display device using this display panel can be any device or apparatus with display function, such as mobile phones, televisions, laptops, iPads, game consoles, Kindles, and in-vehicle display devices.

[0047] In another aspect, the present invention provides a method for fabricating an organic electroluminescent device. The organic electroluminescent device fabricated by this method can be the organic electroluminescent device described above. Therefore, the organic electroluminescent device fabricated by this method can possess all the features and beneficial effects of the organic electroluminescent devices described above, which will not be repeated here.

[0048] In some embodiments of the present invention, reference is made to Figure 6 The method includes:

[0049] S100: A light-emitting functional layer is formed on the first electrode.

[0050] In this step, a light-emitting functional layer is formed on the first electrode. Specifically, a hole injection layer is first formed on the first electrode, followed by a hole transport layer formed on the side of the hole injection layer away from the first electrode. Then, a light-emitting layer is formed on the side of the hole transport layer away from the hole injection layer by vapor deposition of up to two light-emitting materials. Subsequently, an electron transport layer is formed on the side of the light-emitting layer away from the hole transport layer, and finally, an electron injection layer is formed on the side of the electron transport layer away from the light-emitting layer to obtain the light-emitting functional layer. The methods for forming the hole injection layer, hole transport layer, electron transport layer, and electron injection layer are not particularly limited, and those skilled in the art can design them according to specific circumstances.

[0051] In some embodiments of the present invention, the light-emitting layer includes a first sub-pixel region, a second sub-pixel region, and a third sub-pixel region. The first sub-pixel region, the second sub-pixel region, and the third sub-pixel region emit one of red light, green light, and blue light, respectively. At least two of the first sub-pixel regions, the second sub-pixel region, and the third sub-pixel region are provided with a first light-emitting body. The first light-emitting body emits at least two monochromatic lights under different voltages, and one of the monochromatic lights is blue light.

[0052] The first light emitter emits red, green, or blue light under different voltages. At this time, the first light emitter is provided in the first sub-pixel region, the second sub-pixel region, and the third sub-pixel region. Only an organic small molecule light-emitting material needs to be vapor-deposited on the side of the hole transport layer away from the hole injection layer. In other words, only one vapor deposition process is required.

[0053] Alternatively, the first emitting element may emit blue or red light under different voltages, or it may emit blue or green light under different voltages. In this case, the first emitting element is located in the first and second sub-pixel regions, and the second emitting element is located in the third sub-pixel region. Only two organic small-molecule luminescent materials need to be vapor-deposited on the side of the hole transport layer away from the hole injection layer; in other words, only two vapor deposition processes are required. Compared to existing technologies, this method not only improves the problems of incomplete and uneven color display and abnormal image quality caused by the preferential attenuation of blue organic small molecules, but also reduces one or even two vapor deposition processes, lowering process complexity and reducing potential defects.

[0054] The luminescence of the first and second luminescent bodies, the constituent materials of the first luminescent body, and the luminescence principle have been described in detail above and will not be repeated here.

[0055] S200: A second electrode is formed on the side of the light-emitting functional layer away from the first electrode.

[0056] In this step, a second electrode is formed on the side of the light-emitting functional layer away from the first electrode to obtain an organic electroluminescent device. The method for forming the second electrode is not particularly limited, and those skilled in the art can design it according to specific circumstances.

[0057] In another aspect of the invention, a method for driving the organic electroluminescent device described above is provided. In some embodiments of the invention, the method includes applying voltages to light emitters in a first sub-pixel region, a second sub-pixel region, and a third sub-pixel region, causing the first sub-pixel region, the second sub-pixel region, and the third sub-pixel region to emit one of red light, green light, and blue light, respectively, wherein different voltages are applied to the first light emitters located in different sub-pixel regions.

[0058] Specifically, when the first light emitter emits red, green, or blue light under different voltages, the first, second, and third sub-pixel areas are all equipped with first light emitters. By applying different voltages, the first light emitters in the first, second, and third sub-pixel areas emit red, green, and blue light respectively, thus achieving color display of the device. After a predetermined time, by switching the voltages applied to the blue-emitting and red-emitting first light emitters, the unused red light from the blue-emitting first light emitter is emitted, and the unused blue light from the red-emitting first light emitter is emitted. Alternatively, by switching the voltages applied to the blue-emitting and green-emitting first light emitters, the unused green light from the blue-emitting first light emitter is emitted, and the unused blue light from the green-emitting first light emitter is emitted, thereby reconstructing the red, green, and blue primary color pixels, improving problems such as incomplete and uneven color display and abnormal image quality, and extending the lifespan of the device.

[0059] Alternatively, the first light emitter emits two monochromatic lights under different voltages, one of which is blue light. The first light emitter is located in the first and second sub-pixel areas, and the second light emitter is located in the third sub-pixel area, emitting only one monochromatic light. The second light emitter in the third sub-pixel area emits green light. The first light emitters in the first and second sub-pixel areas emit blue or red light under different voltages, specifically, the first light emitter emits blue light under a first voltage and red light under a second voltage, where the first voltage is higher than the second voltage. By applying different voltages to the first light emitters in the first and second sub-pixel areas, the first sub-pixel area emits blue light and the second sub-pixel area emits red light, or vice versa, and by applying a voltage to the second light emitter in the third sub-pixel area to emit green light, the device achieves color display. After a predetermined time, by switching the voltage applied to the first blue light emitter and the first red light emitter, the unused red light from the first blue light emitter is emitted, and the unused blue light from the first red light emitter is emitted, thereby reconstructing the red, green and blue primary color pixels, improving the problems of incomplete and uneven color display and abnormal image quality, and extending the lifespan of the device.

[0060] Alternatively, the second light emitter in the third sub-pixel region emits red light, while the first light emitters in the first and second sub-pixel regions emit blue or green light respectively under different voltages. Specifically, the first light emitter emits blue light under a third voltage and green light under a fourth voltage, where the third voltage is higher than the fourth voltage. By applying different voltages to the first light emitters in the first and second sub-pixel regions, the first sub-pixel region emits blue light and the second sub-pixel region emits green light, or vice versa, and applying a voltage to the second light emitter in the third sub-pixel region to emit red light, the device achieves color display. After a predetermined time, by switching the voltages applied to the blue-emitting and green-emitting first light emitters, the unused green light from the blue-emitting first light emitter is emitted, and the unused blue light from the green-emitting first light emitter is emitted, thereby reconstructing the red, green, and blue primary color pixels, improving problems such as incomplete and uneven color display and abnormal image quality, and extending the device's lifespan.

[0061] The voltage adjustment described above applied to the first light emitter can be performed before the blue light-emitting first light emitter decays and causes display abnormalities.

[0062] The specific voltage values ​​for the first, second, third, and fourth voltages can be designed based on the actual luminescent material used.

[0063] In the description of this invention, the terms "first," "second," "third," and "fourth" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first," "second," "third," or "fourth" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0064] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this specification. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0065] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. An organic electroluminescent device, characterized by comprising: Comprising: a first electrode and a second electrode; a light-emitting functional layer between the first electrode and the second electrode, the light-emitting functional layer comprising a light-emitting layer, the light-emitting layer being composed of at most two light-emitting bodies, the light-emitting layer comprising a first sub-pixel region, a second sub-pixel region and a third sub-pixel region, the first sub-pixel region, the second sub-pixel region and the third sub-pixel region respectively emitting one of red light, green light and blue light, at least two of the first sub-pixel region, the second sub-pixel region and the third sub-pixel region being provided with a first light-emitting body, the at least two sub-pixel regions sharing the same first light-emitting body; the first light-emitting body emitting at least two monochromatic lights at different voltages, and one of the monochromatic lights being blue light; for the first light-emitting body emitting blue light or red light at different voltages, the material constituting the first light-emitting body being prepared by click reaction of alcohol hydroxyl monomer of tertiary amine and activated alkyne; for the first light-emitting body emitting blue light or green light at different voltages, the material constituting the first light-emitting body being obtained by combination of copper ion and green fluorescein or derivative of green fluorescein.

2. The organic electroluminescent device according to claim 1, wherein The first sub-pixel region and the second sub-pixel region are provided with the first light-emitting body, the first light-emitting body emitting two monochromatic lights at different voltages, and the third sub-pixel region is provided with a second light-emitting body, the second light-emitting body emitting one monochromatic light.

3. The organic electroluminescent device according to claim 2, characterized in that The second light-emitting body emits green light, and the first light-emitting body emits blue light or red light at different voltages.

4. The organic electroluminescent device according to claim 3, characterized in that The material constituting the first light-emitting body comprises at least one of (2E)-3-[2-(dimethylamino)ethoxy]propionic acid-2-ene methyl ester, (2E)-3-[2-(diethylamino)ethoxy]propionic acid-2-ene methyl ester and (2E)-3-[2-(dimethylamino)ethoxy]propionic acid-2-ene ethyl ester.

5. The organic electroluminescent device according to claim 2, wherein The second light-emitting body emits red light, and the first light-emitting body emits blue light or green light at different voltages.

6. The organic electroluminescent device according to claim 5, characterized in that The material constituting the first light-emitting body comprises at least one of copper chlorin, copper isothiocyanate fluorescein and copper carboxynaphthalofluorescein.

7. A display panel, characterized by, The organic electroluminescent device of any one of claims 1-6.

8. A method for manufacturing an organic electroluminescent device, characterized by comprising: Comprising: forming a light-emitting functional layer on a first electrode, the light-emitting functional layer comprising a light-emitting layer, the light-emitting layer being formed by evaporation of at most two light-emitting materials, the light-emitting layer comprising a first sub-pixel region, a second sub-pixel region and a third sub-pixel region, the first sub-pixel region, the second sub-pixel region and the third sub-pixel region respectively emitting one of red light, green light and blue light, at least two of the first sub-pixel region, the second sub-pixel region and the third sub-pixel region being provided with a first light-emitting body, the at least two sub-pixel regions sharing the same first light-emitting body; the first light-emitting body emitting at least two monochromatic lights at different voltages, and one of the monochromatic lights being blue light; forming a second electrode on a side of the light-emitting functional layer away from the first electrode; for the first light-emitting body emitting blue light or red light at different voltages, the material constituting the first light-emitting body being prepared by click reaction of alcohol hydroxyl monomer of tertiary amine and activated alkyne; The first light emitter emitting blue light or green light under different voltages is formed by combining copper ions with green fluorescein or a derivative of green fluorescein.

9. A method of driving the organic electroluminescent device according to any one of claims 1 to 6, characterized by, Comprise: Applying voltages to the light emitters in the first, second and third sub-pixel regions to make the first, second and third sub-pixel regions emit one of red light, green light and blue light respectively, Wherein, different voltages are applied to the first light emitters in different sub-pixel regions.

10. The method of claim 9, wherein, After a predetermined time, the voltages applied to the first light emitters emitting blue light and the first light emitters emitting red light are exchanged, or the voltages applied to the first light emitters emitting blue light and the first light emitters emitting green light are exchanged.

11. The method according to claim 9 or 10, characterized in that, The first sub-pixel region and the second sub-pixel region are provided with the first light emitters, and the third sub-pixel region is provided with second light emitters, The second light emitters emit green light, the first light emitters emit blue light under a first voltage, the first light emitters emit red light under a second voltage, and the first voltage is higher than the second voltage; Or, the second light emitters emit red light, the first light emitters emit blue light under a third voltage, the first light emitters emit green light under a fourth voltage, and the third voltage is higher than the fourth voltage.

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