An organic light-emitting structure and light-emitting device

Abstract

This invention discloses an organic light-emitting structure and a light-emitting device. The organic light-emitting structure includes: a first electrode layer, a first organic light-emitting layer, a second electrode layer, a second organic light-emitting layer, and a third electrode layer stacked sequentially. The distance between two adjacent surfaces of the first electrode layer and the second electrode layer varies according to a first predetermined rule, and / or, the distance between two adjacent surfaces of the second electrode layer and the third electrode layer varies according to a second predetermined rule. The organic light-emitting structure provided by this invention can exhibit a certain pattern even when no electricity is applied, thus improving the appearance of the organic light-emitting structure.

Description

Technical Field

[0001] This invention relates to the field of light-emitting technology, and more particularly to an organic light-emitting structure and a light-emitting device. Background Technology

[0002] Organic light-emitting diodes (OLEDs) are devices that emit light through carrier injection and recombination under an electric field, using organic semiconductor materials and light-emitting materials. Displays or lighting products made based on this light-emitting principle are called organic light-emitting displays or organic light-emitting lighting devices. Due to its advantages such as thin materials, uniform light emission, and good light quality, OLED structures have been widely used; however, existing OLED structures offer limited display performance. Summary of the Invention

[0003] This invention provides an organic light-emitting structure and a light-emitting device, which can present certain patterns even when no electricity is applied to the organic light-emitting structure, thereby improving the appearance of the organic light-emitting structure.

[0004] According to one aspect of the present invention, an organic light-emitting structure is provided, comprising:

[0005] A first electrode layer, a first organic light-emitting layer, a second electrode layer, a second organic light-emitting layer, and a third electrode layer are stacked sequentially.

[0006] The distance between two adjacent surfaces of the first electrode layer and the second electrode layer varies according to a first predetermined rule, and / or the distance between two adjacent surfaces of the second electrode layer and the third electrode layer varies according to a second predetermined rule.

[0007] Optionally, when the distance between two adjacent surfaces of the first electrode layer and the second electrode layer changes according to a first predetermined rule, the thickness of the first electrode layer also changes according to the first predetermined rule.

[0008] When the distance between two adjacent surfaces of the second electrode layer and the third electrode layer changes according to a second predetermined rule, the thickness of the third electrode layer also changes according to the second predetermined rule.

[0009] Optionally, when the thickness of the first electrode layer changes: the thickness of the first electrode layer changes in a gradient, or the thickness of the first electrode layer changes linearly, or the first electrode layer includes multiple first sub-regions arranged in an array, with adjacent first sub-regions having different thicknesses.

[0010] When the thickness of the second electrode layer changes: the thickness of the second electrode layer changes in a gradient, or the thickness of the second electrode layer changes linearly, or the second electrode layer comprises multiple second sub-regions arranged in an array, with adjacent second sub-regions having different thicknesses. Optionally, the first organic light-emitting layer and the second organic light-emitting layer emit different colors.

[0011] Optionally, the thickness gradient of the first electrode layer may increase or decrease in a certain direction, or the thickness may decrease in some areas while the thickness remains unchanged in other areas.

[0012] The thickness gradient of the second electrode layer changes either by increasing or decreasing the gradient in a certain direction, or by decreasing the thickness in some areas and keeping the thickness unchanged in others.

[0013] Optionally, the first organic light-emitting layer and the second organic light-emitting layer emit different colors.

[0014] Optionally, the thickness of the third electrode layer is fixed, and the third electrode layer undulates with the height of the second organic light-emitting layer.

[0015] Optionally, the thickness of both the first electrode layer and the second electrode layer can range from 3 nm to 100 nm.

[0016] Optionally, the semi-transparent electrode may be made of at least one of aluminum, magnesium, and silver.

[0017] Optionally, the first organic light-emitting layer and the second organic light-emitting layer emit light in one of the following colors: red, green, blue, yellow, orange-red, and light red.

[0018] According to one aspect of the present invention, a light-emitting device is provided, comprising a substrate, an organic light-emitting structure as described in any embodiment disposed on the substrate, and an encapsulation layer disposed on the side of the organic light-emitting structure away from the substrate.

[0019] The organic light-emitting structure provided by the embodiment of the present invention includes: a first electrode layer, a first organic light-emitting layer, a second electrode layer, a second organic light-emitting layer, and a third electrode layer stacked sequentially; the distance between adjacent surfaces of the first electrode layer and the second electrode layer varies according to a first predetermined rule, and / or the distance between adjacent surfaces of the second electrode layer and the third electrode layer varies according to a second predetermined rule, so that the cavity lengths of the microcavities formed inside the organic light-emitting structure are different at different positions. When the organic light-emitting structure is not powered, when ambient light enters the organic light-emitting structure, due to the different cavity lengths of the microcavities at different positions of the organic light-emitting structure, the wavelengths of the ambient light emitted from the different cavity length positions of the organic light-emitting structure are different, so that a certain pattern can be presented even when the organic light-emitting structure is not powered, thereby improving the appearance of the organic light-emitting structure.

[0020] It should be understood that the description in this section is not intended to identify key or essential features of the embodiments of the present invention, nor is it intended to limit the scope of the invention. Other features of the invention will become readily apparent from the following description. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 This is a schematic diagram of an organic light-emitting structure provided in an embodiment of the present invention;

[0023] Figure 2 This is a schematic diagram of another organic light-emitting structure provided in an embodiment of the present invention;

[0024] Figure 3 This is a schematic diagram of another organic light-emitting structure provided in an embodiment of the present invention;

[0025] Figure 4 This is a schematic diagram of another organic light-emitting structure provided in an embodiment of the present invention;

[0026] Figure 5 This is a top view of a first electrode layer provided in an embodiment of the present invention;

[0027] Figure 6 This is a schematic diagram of another organic light-emitting structure provided in an embodiment of the present invention;

[0028] Figure 7 This is a schematic diagram of another organic light-emitting structure provided in an embodiment of the present invention;

[0029] Figure 8 This is a schematic diagram of a light-emitting device provided in an embodiment of the present invention. Detailed Implementation

[0030] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0031] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of the invention described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover a non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0032] This invention provides an organic light-emitting structure. Figure 1 This is a schematic diagram of an organic light-emitting structure provided in an embodiment of the present invention, for reference. Figure 1 The organic light-emitting structure includes: a first electrode layer 10, a first organic light-emitting layer 20, a second electrode layer 30, a second organic light-emitting layer 40, and a third electrode layer 50 stacked sequentially; the distance between adjacent surfaces of the first electrode layer 10 and the second electrode layer 30 varies according to a first predetermined rule, and / or the distance between adjacent surfaces of the second electrode layer 30 and the third electrode layer 50 varies according to a second predetermined rule.

[0033] In this OLED structure, the second electrode layer 30 is a shared electrode. The first electrode layer 10, the first organic light-emitting layer 20, and the second electrode layer 30 can constitute one OLED structure, and the second electrode layer 30, the second organic light-emitting layer 40, and the third electrode layer 50 can constitute another OLED structure. The first organic light-emitting layer 20 and the second organic light-emitting layer 40 can be set to emit light of any color as needed. For example, the emission colors of the first organic light-emitting layer 20 and the second organic light-emitting layer 40 are one of red, green, blue, yellow, orange-red, and light red, respectively. The first setting rule can be that it gradually decreases or gradually increases along a certain direction, or increases or decreases along a certain direction first, or has different thicknesses in some areas than in others. The second setting rule can also be that it gradually decreases or gradually increases along a certain direction, or increases or decreases along a certain direction first, or has different thicknesses in some areas than in others.

[0034] For example, refer to Figure 1When the distance between adjacent surfaces of the first electrode layer 10 and the second electrode layer 30 varies according to a predetermined rule, if the first electrode layer 10 is a reflective electrode and the second electrode layer 30 is a semi-transparent electrode, or if the third electrode layer 50 is a reflective electrode and the second electrode layer 30 and the first electrode layer 10 are semi-transparent electrodes, the first electrode layer 10, the second electrode layer 30, and the first organic layer 20 constitute a microcavity. The distance between adjacent surfaces of the first electrode layer 10 and the second electrode layer 30 is the cavity length of the microcavity. The cavity length of the microcavity varies according to a predetermined rule, and different cavity lengths result in different light extraction effects. When the electrodes of the organic light-emitting structure are not energized, when ambient light enters the organic light-emitting structure, due to the different cavity lengths of the microcavities at different positions of the organic light-emitting structure, the wavelengths of the ambient light emitted from different cavity length positions of the organic light-emitting structure are different. This allows the organic light-emitting structure to display certain patterns even when no power is applied, improving its appearance.

[0035] Continue to refer to Figure 1 If the first electrode layer 10 is a reflective electrode and the third electrode layer 30 is a semi-transparent electrode, or if the third electrode layer 30 is a reflective electrode and the first electrode layer 10 is a semi-transparent electrode, the first electrode layer 10, the third electrode layer 30, and the structure between them constitute a microcavity. The distance between adjacent surfaces of the first electrode layer 10 and the third electrode layer 50 is the cavity length of the microcavity. The distance between adjacent surfaces of the first electrode layer 10 and the second electrode layer 30 varies according to a set rule. When the film thickness between the second electrode layer 30 and the third electrode layer 50 is uniform, the cavity length of the microcavity varies according to the set rule. When the electrodes of the organic light-emitting structure are not energized, when ambient light enters the organic light-emitting structure, due to the different cavity lengths of the microcavities at different positions of the organic light-emitting structure, the wavelengths of the ambient light emitted from different cavity length positions of the organic light-emitting structure are different. This allows the organic light-emitting structure to present a certain pattern even when no power is applied, improving the appearance of the organic light-emitting structure.

[0036] Figure 2 This is a schematic diagram of another organic light-emitting structure provided in an embodiment of the present invention, for reference. Figure 2When the distance between adjacent surfaces of the second electrode layer 30 and the third electrode layer 50 varies according to a predetermined rule, if the first electrode layer 10 is a reflective electrode and the second electrode layer 30 and the third electrode layer 50 are semi-transparent electrodes, or if the third electrode layer 50 is a reflective electrode and the second electrode layer 30 is a semi-transparent electrode, then a microcavity can be formed between the second electrode layer 30 and the third electrode layer 50. The distance between adjacent surfaces of the second electrode layer 30 and the third electrode layer 50 is the length of the microcavity, and the length of the microcavity varies according to a second predetermined rule. When the electrodes of the organic light-emitting structure are not energized, when ambient light enters the organic light-emitting structure, due to the different lengths of the microcavities at different positions of the organic light-emitting structure, the wavelengths of the ambient light emitted from different positions of the organic light-emitting structure are different. This allows the organic light-emitting structure to present a certain pattern even when no power is applied, improving the appearance of the organic light-emitting structure.

[0037] Figure 3 This is a schematic diagram of another organic light-emitting structure provided in an embodiment of the present invention, for reference. Figure 3 The distance between adjacent surfaces of the first electrode layer 10 and the second electrode layer 30 varies according to a predetermined rule. Similarly, the distance between adjacent surfaces of the second electrode layer 30 and the third electrode layer 50 varies according to a predetermined rule. When the first electrode layer 10 is a reflective electrode, the second electrode layer 30 can be a semi-transparent electrode, forming a microcavity between them. Alternatively, the third electrode layer 50 can be a semi-transparent electrode, forming a microcavity between them. Or, both the second and third electrode layers 30 and 50 can be semi-transparent electrodes, forming a microcavity between them and between them. In this case, the length of each microcavity varies. Thus, when ambient light enters the organic light-emitting structure, it passes through the microcavities, resulting in different wavelengths of ambient light emitted from different cavity lengths. This allows the organic light-emitting structure to display patterns even without power, enhancing its appearance. Furthermore, when the third electrode layer 50 is a reflective electrode, its working principle is the same as that of the above embodiments, and will not be repeated here.

[0038] The organic light-emitting structure provided by the technical solution of this invention includes: a first electrode layer 10, a first organic light-emitting layer 20, a second electrode layer 30, a second organic light-emitting layer 40, and a third electrode layer 50 stacked sequentially; the distance between adjacent surfaces of the first electrode layer 10 and the second electrode layer 30 varies according to a first predetermined rule, and / or the distance between adjacent surfaces of the second electrode layer 30 and the third electrode layer 50 varies according to a second predetermined rule, so that the cavity lengths of the microcavities formed inside the organic light-emitting structure are different at different positions. When the organic light-emitting structure is not powered, when ambient light enters the organic light-emitting structure, due to the different cavity lengths of the microcavities at different positions of the organic light-emitting structure, the wavelengths of the ambient light emitted from the different cavity length positions of the organic light-emitting structure are different, so that even when the organic light-emitting structure is not powered, a certain pattern can be presented, improving the appearance of the organic light-emitting structure.

[0039] Optional, see reference Figure 1 When the distance between two adjacent surfaces of the first electrode layer 10 and the second electrode layer 30 changes according to a first predetermined rule, the thickness of the first electrode layer 10 changes according to the first predetermined rule.

[0040] refer to Figure 2 When the distance between two adjacent surfaces of the second electrode layer 30 and the third electrode layer 50 changes according to the second preset rule, the thickness of the third electrode layer 50 changes according to the second preset rule.

[0041] Specifically, in fabricating the organic light-emitting structure, a first electrode layer 10, a first organic layer 20, a second electrode layer 30, a second organic layer 40, and a third electrode layer 50 can be sequentially fabricated on the substrate. The thickness of the first electrode layer 10 varies according to a first predetermined rule, that is, the surface of the first electrode layer 10 adjacent to the substrate is a flat surface, the surface of the first electrode layer 10 adjacent to the second electrode layer 20 is undulating, and when fabricating the first organic layer 20, the first organic layer 20 is directly fabricated on the undulating surface of the first electrode layer 10, and the surface of the first organic layer 20 away from the first electrode layer 10 can be a flat surface, so that the thickness of the first organic layer 20 varies according to the first predetermined rule after fabrication.

[0042] The thickness of the second electrode layer 30 varies according to a second predetermined rule. That is, the surface of the second electrode layer 30 adjacent to the first electrode layer 10 is a flat surface, while the surface of the second electrode layer 30 away from the first electrode layer 10 is uneven. When the second organic layer 40 is subsequently fabricated, the second organic layer 40 is directly fabricated on the uneven surface of the second electrode layer 30, and the surface of the second organic layer 40 away from the second electrode layer 30 can be a flat surface, so that the thickness of the second organic layer 40 varies according to the second predetermined rule after it is fabricated.

[0043] Optionally, when the thickness of the first electrode layer 10 changes: Figure 4This is a schematic diagram of another organic light-emitting structure provided in an embodiment of the present invention, for reference. Figure 3 and Figure 4 The thickness gradient of the first electrode layer 10, or, Figure 5 This is a schematic diagram of another organic light-emitting structure provided in an embodiment of the present invention, for reference. Figure 5 The thickness of the first electrode layer 10 varies linearly, or... Figure 6 This is a top view of a first electrode layer provided in an embodiment of the present invention, with reference to... Figure 6 The first electrode layer 10 includes multiple first sub-regions 11 arranged in an array, and adjacent first sub-regions 11 have different thicknesses.

[0044] When the thickness of the second electrode layer 20 changes: the thickness of the second electrode layer changes in a gradient, or the thickness of the second electrode layer 20 changes linearly, or the second electrode layer 20 includes multiple second sub-regions arranged in an array, and the thickness of adjacent second sub-regions is different.

[0045] Among them, reference Figure 3 and Figure 4 The thickness gradient of the first electrode layer 10 can be as follows: Figure 4 As shown, the gradient increases or decreases in a certain direction, or it can be as follows: Figure 3 As shown, the thickness decreases in some areas and remains unchanged in others. (Reference) Figure 5 The thickness of the first electrode layer 10 changes linearly, that is, the thickness of the first electrode layer 10 increases or decreases continuously along a certain direction, or decreases first and then increases, or increases first and then decreases.

[0046] The thickness of the first electrode layer 10 is set to vary with a gradient or linear variation, or the first electrode layer 10 includes multiple first sub-regions 11 arranged in an array, with adjacent first sub-regions 11 having different thicknesses, so that the microcavity length varies more diversely, and the color of the ambient light emitted by the organic light-emitting structure changes more diversely when the organic light-emitting structure is not powered, and the appearance effect of the organic light-emitting structure is better.

[0047] Similarly, the thickness gradient change of the second electrode layer can be an increase or decrease along a certain direction, or the thickness can decrease in some areas while remaining unchanged in others. A linear transformation of the thickness of the second electrode layer 30 means that the thickness of the second electrode layer 30 continuously increases or decreases along a certain direction, or decreases first and then increases, or increases first and then decreases.

[0048] The thickness of the second electrode layer 30 can be varied by a gradient or linear variation. Alternatively, the second electrode layer 20 can include multiple second sub-regions arranged in an array, with adjacent second sub-regions having different thicknesses. This allows for more diverse variations in the microcavity length, resulting in more diverse color variations of the ambient light emitted by the organic light-emitting structure when it is not powered, and a better appearance of the organic light-emitting structure.

[0049] Optionally, the first organic light-emitting layer and the second organic light-emitting layer emit different colors.

[0050] Specifically, by controlling the first electrode layer 10, the second electrode layer 30, and the third electrode layer 50, the organic light-emitting structure can emit light only in the first organic light-emitting layer 20, only in the second organic light-emitting layer 40, or both the first organic light-emitting layer 20 and the second organic light-emitting layer 40. The first organic light-emitting layer 20 and the second organic light-emitting layer 40 emit different colors, making the organic light-emitting structure emit more diverse colors and enabling color-changing displays.

[0051] For example, the first organic light-emitting layer 20 and the second organic light-emitting layer 40 can emit contrasting colors such as red and green, yellow and blue, or colors with similar color temperatures such as light red and orange-red.

[0052] Optional, Figure 7 This is a schematic diagram of another organic light-emitting structure provided in an embodiment of the present invention, for reference. Figure 7 The thickness of the third electrode layer 50 is fixed, and the third electrode layer 50 undulates with the height of the second organic light-emitting layer 40.

[0053] In this process, when fabricating the second organic layer 40, the surface of the second organic layer 40 away from the second electrode 30 is not completely flat. As a result, the third electrode layer 50 undulates with the second organic light-emitting layer 40, forming a corrugated structure. This reduces the proportion of plasma modes, decreases the loss of photons emitted by the light-emitting layer at the interface of the third electrode layer, and improves the light extraction efficiency.

[0054] Optionally, the thickness of both the first electrode layer and the second electrode layer can be in the range of 3nm-100nm, and the thickness of the first electrode layer and the second electrode layer can be 30nm or 60nm.

[0055] Specifically, if the thickness of the first and second electrode layers is less than 3 nm, the fabrication process is quite difficult; if the thickness of the first and second electrode layers is greater than 100 nm, it will result in low light transmittance. Setting the thickness range of both the first and second electrode layers to 3 nm-100 nm reduces the fabrication difficulty of the first and second electrode layers while ensuring high light transmittance.

[0056] Optionally, the semi-transparent electrode may be made of at least one of aluminum, magnesium, and silver.

[0057] The light transmittance of a semi-transparent electrode can be greater than or equal to 50% and less than or equal to 80%. Aluminum, magnesium, and silver all have high light transmittance and mature manufacturing processes. Using these materials to manufacture semi-transparent electrodes is a simple process, and the semi-transparent electrodes have high light transmittance.

[0058] Optionally, the first organic light-emitting layer and the second organic light-emitting layer emit light in one of the following colors: red, green, blue, yellow, orange-red, and light red.

[0059] Optional, see reference Figure 1 When the distance between two adjacent surfaces of the first electrode layer 10 and the second electrode layer 20 changes according to a first predetermined rule, the first organic light-emitting layer 20 is a blue light-emitting layer; Reference Figure 2 When the distance between two adjacent surfaces of the second electrode layer 30 and the third electrode layer 50 changes according to a second predetermined rule, the second organic light-emitting layer 40 is a blue light-emitting layer.

[0060] For details, please refer to Figure 1 When the distance between two adjacent surfaces of the first electrode layer 10 and the second electrode layer 20 changes according to the first set rule, the surface of the first electrode layer 10 undulates, forming a corrugated structure, which can reduce the proportion of plasma modes, reduce the loss of photons emitted by the first light-emitting layer 20 at the interface of the first electrode layer 10, and improve the light extraction efficiency. Setting the first light-emitting layer 10 as a blue light-emitting layer can improve the blue light extraction efficiency.

[0061] refer to Figure 2 When the distance between two adjacent surfaces of the second electrode layer 30 and the third electrode layer 50 changes according to the second set law, the surface of the second electrode layer 30 undulates, forming a corrugated structure, which can reduce the proportion of plasma modes, reduce the loss of photons emitted by the second light-emitting layer 40 at the interface of the second electrode layer 30, and improve the light extraction efficiency. Setting the second light-emitting layer 40 as a blue light-emitting layer can improve the blue light extraction efficiency.

[0062] Based on the above embodiments, this invention also provides a light-emitting device. Figure 8 This is a schematic diagram of a light-emitting device provided in an embodiment of the present invention, for reference. Figure 8 The light-emitting device includes a substrate 60, an organic light-emitting structure 100 as described in any embodiment disposed on the substrate 60, and an encapsulation layer 70 disposed on the side of the organic light-emitting structure 100 away from the substrate 60.

[0063] It should be understood that the various forms of processes shown above can be used, with steps reordered, added, or deleted. For example, the steps described in this invention can be executed in parallel, sequentially, or in different orders, as long as the desired result of the technical solution of this invention can be achieved, and this is not limited herein.

[0064] The specific embodiments described above do not constitute a limitation on the scope of protection of this invention. Those skilled in the art should understand that various modifications, combinations, sub-combinations, and substitutions can be made according to design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this invention should be included within the scope of protection of this invention.

Claims

1. An organic light-emitting structure, characterized in that, include: A first electrode layer, a first organic light-emitting layer, a second electrode layer, a second organic light-emitting layer, and a third electrode layer are stacked sequentially. The distance between two adjacent surfaces of the first electrode layer and the second electrode layer varies according to a first predetermined rule, and the distance between two adjacent surfaces of the second electrode layer and the third electrode layer varies according to a second predetermined rule; When the distance between two adjacent surfaces of the first electrode layer and the second electrode layer changes according to a first predetermined rule, the thickness of the first electrode layer changes according to the first predetermined rule. When the distance between two adjacent surfaces of the second electrode layer and the third electrode layer changes according to a second predetermined rule, the thickness of the third electrode layer changes according to the second predetermined rule. The distance between two adjacent surfaces of the first electrode layer and the second electrode layer is the thickness of the first organic light-emitting layer, and the thickness of the first organic light-emitting layer varies according to a first predetermined rule; the distance between two adjacent surfaces of the second electrode layer and the third electrode layer is the thickness of the second organic light-emitting layer, and the thickness of the second organic light-emitting layer varies according to a second predetermined rule.

2. The organic light-emitting structure according to claim 1, characterized in that: When the thickness of the first electrode layer changes: the thickness of the first electrode layer changes in a gradient, or the thickness of the first electrode layer changes linearly, or the first electrode layer includes multiple first sub-regions arranged in an array, and the thickness of adjacent first sub-regions is different; When the thickness of the second electrode layer changes: the thickness of the second electrode layer changes in a gradient, or the thickness of the second electrode layer changes linearly, or the second electrode layer includes multiple second sub-regions arranged in an array, with adjacent second sub-regions having different thicknesses.

3. The organic light-emitting structure according to claim 2, characterized in that: The thickness gradient of the first electrode layer changes either by increasing or decreasing the gradient in a certain direction, or by decreasing the thickness in some areas and keeping the thickness unchanged in others. The thickness gradient of the second electrode layer changes either by increasing or decreasing the gradient in a certain direction, or by decreasing the thickness in some areas and keeping the thickness unchanged in others.

4. The organic light-emitting structure according to claim 1, characterized in that: The first organic light-emitting layer and the second organic light-emitting layer emit different colors.

5. The organic light-emitting structure according to claim 1, characterized in that: The thickness of both the first electrode layer and the second electrode layer ranges from 3nm to 100nm.

6. The organic light-emitting structure according to claim 1, characterized in that: The semi-transparent electrode uses at least one of aluminum, magnesium, and silver. The first electrode layer is a semi-transparent electrode, or the second electrode layer is a semi-transparent electrode, or the third electrode layer is a semi-transparent electrode, or both the first electrode layer and the second electrode layer are semi-transparent electrodes, or both the second electrode layer and the third electrode layer are semi-transparent electrodes.

7. The organic light-emitting structure according to claim 2, characterized in that: The first organic light-emitting layer and the second organic light-emitting layer emit light in one of the following colors: red, green, blue, yellow, orange-red, and light red.

8. A light-emitting device, characterized in that, It includes a substrate, at least one organic light-emitting structure as described in any one of claims 1-7 disposed on the substrate, and an encapsulation layer disposed on the side of the organic light-emitting structure away from the substrate.

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