Organic light emitting device, method of manufacturing the same, and organic light emitting panel

Abstract

The organic light-emitting device provided by the present disclosure comprises an anode layer, a hole transport layer, an organic light-emitting layer, an electron transport layer and a cathode layer which are sequentially stacked. At least one of the anode layer, the hole transport layer and the electron transport layer is a thickness variation layer, and the thickness variation layer comprises at least two film layers with different thicknesses, so that when the light emitted by the organic light-emitting layer transmits through the film layers with different thicknesses in the thickness variation layer and is emitted outward, at least two groups of emitted light with different central wavelengths are formed respectively. Since the light emitted by the organic light-emitting layer can form at least two groups of emitted light with different central wavelengths when it transmits through the film layers with different thicknesses in the thickness variation layer and is emitted outward, at least two different spectra can be combined into a new spectrum with a spectrum width wider than that of any one of the spectra, and the wider spectrum can help to improve the brightness decay under different viewing angles, thus being beneficial to improving the display effect in daily use.

Description

Technical Field

[0001] This disclosure relates to the field of organic light-emitting device technology, and in particular, to an organic light-emitting device, a method for fabricating the same, and an organic light-emitting panel. Background Technology

[0002] OLED devices can be classified into bottom-emitting organic light-emitting devices (hereinafter referred to as "bottom-emitting devices") and top-emitting organic light-emitting devices (hereinafter referred to as "top-emitting devices") according to their light emission method. In top-emitting devices, the light emitted is directly emitted from the top, without needing to pass through the substrate and the circuitry below, thus greatly improving the aperture ratio and light emission efficiency. Top-emitting devices typically utilize the microcavity effect to amplify and narrow the light of specific wavelengths within the microcavity, thereby improving the color purity and luminous efficiency.

[0003] However, in top-emitting microcavity devices, the actual path length of light changes as it passes through the microcavity at different angles, resulting in variations in the microcavity length at different viewing angles. This variation causes a further shift in the center wavelength after combining the intrinsic spectrum obtained from the organic material itself with the spectrum of a specific wavelength obtained from the microcavity effect. This leads to a significant decrease in brightness at different viewing angles, severely impacting the display performance during daily use. Summary of the Invention

[0004] In view of this, this disclosure provides an organic light-emitting device, a method for fabricating the same, and an organic light-emitting panel, aiming to partially solve the problem of severe brightness attenuation at different viewing angles in traditional top-emitting microcavity devices.

[0005] In a first aspect, this disclosure provides an organic light-emitting device, comprising an anode layer, a hole transport layer, an organic light-emitting layer, an electron transport layer, and a cathode layer stacked sequentially. At least one of the anode layer, the hole transport layer, and the electron transport layer is a thickness-varying layer, which includes at least two portions of film layers with different thicknesses, such that when light emitted by the organic light-emitting layer passes through the portions of film layers with different thicknesses in the thickness-varying layer and is emitted outward, at least two sets of emitted light with different center wavelengths are formed.

[0006] Due to the different film thicknesses, the optical path difference of the microcavities at different locations varies. This causes the light emitted from the organic light-emitting layer to form at least two sets of outgoing light with different center wavelengths when it passes through the different thicknesses of the film layers in the layer with varying thicknesses. In other words, at least two different spectra are obtained. In this way, at least two different spectra can be combined to form a new spectrum with a wider spectral width than any one of the individual spectra. The wider spectrum not only covers a wider wavelength range, but also helps to improve the uniformity of light intensity distribution in all directions. This results in less brightness attenuation at different viewing angles, thereby helping to improve the brightness attenuation at different viewing angles and improving the display effect during daily use.

[0007] In an optional embodiment, the thickness difference between the thickest and thinnest portion of at least two portions with different film thicknesses is: Preferably, the thickness difference between the thickest and thinnest portion of at least two portions with different film thicknesses is .

[0008] In one optional embodiment, the proportion of the surface of the portion of the film layer with different thicknesses that faces away from the anode layer to the surface of the thickness-varying layer that faces away from the anode layer on the anode layer is between 10% and 90%.

[0009] In one alternative embodiment, the thickness variation layer includes a first portion and a second portion, wherein the film thickness of the first portion is greater than the film thickness of the second portion.

[0010] In one alternative embodiment, the thickness variation layer includes a first portion, a second portion, and a third portion, and the thickness difference between the first portion, the second portion, and the third portion is equal.

[0011] In one optional embodiment, the projected area of ​​the surface of the first or second portion facing away from the anode layer on the anode layer is in the range of 10% to 90% of the projected area of ​​the surface of the thickness variation layer facing away from the anode layer on the anode layer. Preferably, the ratio of the projected area of ​​the surface of the first or second portion facing away from the anode layer on the anode layer to the projected area of ​​the surface of the thickness variation layer facing away from the anode layer on the anode layer is equal to 50%.

[0012] In one alternative embodiment, the thickness-varying layer is a hole transport layer.

[0013] In one optional embodiment, the organic light-emitting device further includes a substrate. When the anode layer is a reflective layer and the cathode layer is a semi-reflective layer, the anode layer, hole transport layer, organic light-emitting layer, electron transport layer and cathode layer are stacked sequentially from bottom to top on the substrate. When the cathode layer is a reflective layer and the anode layer is a semi-reflective layer, the cathode layer, electron transport layer, organic light-emitting layer, hole transport layer and anode layer are stacked sequentially from bottom to top on the substrate.

[0014] Secondly, this disclosure provides a method for fabricating an organic light-emitting device, comprising: fabricating a substrate and an anode layer on the substrate; fabricating a second portion of a hole transport layer at a corresponding position on a second portion of the anode layer; fabricating a first portion of a hole transport layer at a corresponding position on a first portion of the anode layer, wherein the film thickness of the first portion is greater than the film thickness of the second portion, so as to form at least two sets of emitted light with different center wavelengths; and sequentially fabricating an organic light-emitting layer, an electron transport layer, and a cathode layer on the hole transport layer, wherein the light emitted by the organic light-emitting layer passes through the first portion and the second portion and is emitted outward.

[0015] Thirdly, this disclosure provides an organic light-emitting panel that includes a plurality of organic light-emitting devices as described above. Attached Figure Description

[0016] It should be understood that the following figures only illustrate certain embodiments of this disclosure and should not be construed as limiting the scope.

[0017] It should be understood that the same or similar reference numerals are used in the accompanying drawings to denote the same or similar elements.

[0018] It should be understood that the accompanying drawings are only schematic, and the dimensions and scales of the elements in the drawings are not necessarily precise.

[0019] Figure 1 This is a schematic diagram of an organic light-emitting device structure provided in an embodiment of the present disclosure.

[0020] Figure 2 This is a schematic diagram of the cross-section of an organic light-emitting device and a layer with varying thickness provided in an embodiment of this disclosure.

[0021] Figure 3 This is a schematic diagram of the structure of an organic light-emitting device provided in an embodiment of the present disclosure.

[0022] Figure 4 This is a schematic diagram of the structure of an organic light-emitting device provided in an embodiment of the present disclosure.

[0023] Figure 5 This is a schematic diagram of the structure of an organic light-emitting device provided in an embodiment of the present disclosure.

[0024] Figure 6 This is a schematic diagram of the structure of an organic light-emitting device provided in an embodiment of the present disclosure.

[0025] Figure 7 This is a schematic diagram of the structure of an organic light-emitting device provided in an embodiment of the present disclosure.

[0026] Figure 8 This is a schematic diagram of the structure of an organic light-emitting device provided in an embodiment of the present disclosure.

[0027] Figure 9This is a flowchart illustrating a method for fabricating an organic light-emitting device according to an embodiment of the present disclosure.

[0028] Figure 10 The spectrum of an organic light-emitting device provided in an embodiment of this disclosure.

[0029] Figure 11 This is a schematic diagram of the spacing between two different sets of center wavelengths and the full width at half maximum (FWHM) of the new spectrum provided in an embodiment of this disclosure. Detailed Implementation

[0030] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions of this application will be clearly and completely described below in conjunction with specific embodiments and corresponding drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0031] To reduce the viewing angle dependence of top-emitting organic light-emitting microcavity devices (hereinafter referred to as "top-emitting devices"), this disclosure provides an organic light-emitting device, which includes an anode layer, a hole transport layer, an organic light-emitting layer, an electron transport layer and a cathode layer stacked sequentially; at least one of the anode layer, the hole transport layer and the electron transport layer is a thickness variation layer; the thickness variation layer includes at least two parts with different film thicknesses, so that when the light emitted by the organic light-emitting layer passes through the parts with different film thicknesses in the thickness variation layer and is emitted outward, at least two sets of emitted light with different center wavelengths are formed respectively.

[0032] Due to the different film thicknesses, the optical path difference of the microcavities at different locations varies. This allows the light emitted from the organic light-emitting layer to form at least two sets of outgoing light with different center wavelengths when it passes through the different parts of the film thickness in the layer with varying thickness. In other words, at least two different spectra are obtained. In this way, the at least two different spectra will be combined to form a new spectrum with a wider spectral width than any one of the individual spectra. The wider spectrum can help improve the brightness attenuation at different viewing angles, thus improving the display effect during daily use.

[0033] The embodiments of this disclosure will now be described by way of example with reference to the accompanying drawings.

[0034] refer to Figures 1 to 3 This disclosure provides an organic light-emitting device 100. For example, the organic light-emitting device 100 provided in this application can be applied to light-emitting units of different colors, such as red organic light-emitting devices, blue organic light-emitting devices, and green organic light-emitting devices.

[0035] The organic light-emitting device 100 disclosed herein may include an anode layer 10, a hole transport layer 20, an organic light-emitting layer 30, an electron transport layer 40, and a cathode layer 50 stacked sequentially. It is understood that light emitted from the organic light-emitting device 100 can be emitted directly from either the anode layer or the cathode layer; no specific limitation is made here.

[0036] In this design, at least one of the anode layer 10, the hole transport layer 20, and the electron transport layer 40 is a thickness-varying layer. For example, the electron transport layer 40 can serve as a thickness-varying layer (see reference). Figure 1 The thickness of other film layers remains constant. Hole transport layer 20 is a layer with varying thickness (see reference). Figure 2 The overall thickness of other film layers remains constant. Anode layer 10 serves as a thickness-varying layer (see reference). Figure 3 The thickness of other film layers remains unchanged. Of course, it is also possible to choose both the anode layer and the hole transport layer as thickness variation layers, or both the hole transport layer and the electron transport layer as thickness variation layers, or all three layers of the anode layer, hole transport layer and electron transport layer as thickness variation layers. No specific limitation is made here.

[0037] Specifically, the thickness variation layer may include at least two portions of film with different thicknesses. For example, when the hole transport layer 20 is used as a thickness variation layer, it may include a first portion 21 and a second portion 22 (see reference). Figure 2 It may also include Part 1 20a, Part 2 20b and Part 3 20c (see reference). Figure 6 Due to the varying film thicknesses, the optical path difference of the microcavities at different locations differs. This causes the light emitted from the organic light-emitting layer to form at least two sets of outgoing light with different center wavelengths when it passes through the portions of the film layer with varying thicknesses. In other words, at least two different spectra are obtained. These at least two different spectra are then combined to form a new spectrum with a wider spectral width than either of the individual spectra. The wider spectrum not only covers a wider wavelength range but also helps to improve the uniformity of light intensity distribution in all directions. This results in less brightness attenuation at different viewing angles, thus helping to improve the display effect during daily use.

[0038] It is worth noting that the variations in the film layers 10, 20, and 40 primarily affect the luminescence performance of organic light-emitting devices (OLEDs), with relatively minor impacts on other aspects. Therefore, at least one of these three film layers can be selected as the thickness variation layer. Of course, if an electron blocking layer is present in the OLED, it can also serve as the thickness variation layer.

[0039] Preferably, the hole transport layer 20 is a layer with varying thickness. This is mainly because the hole transport layer primarily affects luminescence performance, with very little impact on other performance characteristics. Moreover, the thickness of the hole transport layer is typically in the range of tens to hundreds of nanometers, making it easy to obtain different spectra by controlling the thickness of the hole transport layer, thereby achieving a wider spectrum without affecting other performance characteristics of the organic light-emitting device.

[0040] Furthermore, in at least two portions of the film with different thicknesses, the thickness difference between the thickest and thinnest portion is: For example, the thickness difference between the thickest part of the film and the thinnest part of the film can be... Etc., no specific limitation is made here.

[0041] It is understandable that if the thickness difference between the thickest and thinnest parts of the film is less than... The small difference in optical path difference between the microcavities at different locations results in a very small gap between the center wavelengths of at least two sets of emitted light when the light emitted from the organic light-emitting layer passes through the thickest and thinnest parts of the layer with varying thickness. This leads to a still narrow spectral width in the synthesized new spectrum, and the narrow spectrum does not significantly improve the brightness attenuation at different viewing angles. If the thickness difference between the thickest and thinnest parts is greater than... The significant difference in optical path difference between the microcavities at different locations results in at least two sets of emitted light with vastly different center wavelengths when the light emitted from the organic light-emitting layer passes through the thickest and thinnest parts of the film. The entire spectrum may even lack overlap, making it impossible to synthesize a new spectrum with a single center wavelength. Therefore, in at least two sections with different film thicknesses, the thickness difference between the thickest and thinnest parts is... In this case, it helps to synthesize a new spectrum with a wider spectral width, thereby improving the uniformity of light intensity distribution in all directions and reducing brightness attenuation at different viewing angles.

[0042] Preferably, the thickness difference between the thickest and thinnest portion of at least two portions with different film thicknesses is . For example, the thickness difference between the thickest part of the film and the thinnest part of the film is or It is understandable that the design of the film thickness difference requires not only ensuring that the two sets of center wavelengths formed are not too close together (e.g., the interval between the two sets of center wavelengths is only 2nm or 3nm), but also ensuring that the two sets of center wavelengths formed are not too far apart (e.g., the interval between the two sets of center wavelengths is 50nm or 70nm). In this way, the at least two different spectra obtained can be effectively synthesized into a new spectrum with a wider spectral width, which is beneficial to improving the brightness attenuation at different viewing angles, thereby improving the display effect in daily use.

[0043] In one example, the thickness-varying layer may include a first portion and a second portion, wherein the film thickness of the first portion is greater than the film thickness of the second portion. For example, refer to... Figure 1 The electron transport layer 40 is a thickness variation layer, and the thickness d41 of the first part 41, which is the thickest part of the film, is thicker than the thickness d42 of the second part 42, which is the thinnest part of the film. In this case, the center wavelength of the synthesized new spectrum shifts by 3–5 nm. For example, see reference... Figure 2 The hole transport layer 20 is a thickness-varying layer, where the thickness d21 of the first part 21, which is the thickest, is greater than the thickness d22 of the second part 22, which is the thinnest. In this case, the center wavelength of the synthesized new spectrum shifts by 3–4 nm.

[0044] It is understandable that for red, blue, and green organic light-emitting devices (OLEDs), the difference in film thickness of the thickness variation layer can be the same or different. For example, refer to... Figure 9 In blue organic light-emitting devices, the thickness difference between the two parts of the thickness-varying layer is significant. The center wavelength of the synthesized new spectrum shifts by 6–8 nm compared to the spectrum without a thickness variation layer.

[0045] refer to Figure 4 and Figure 5 The thickness variation layer may also include a first part, a second part, and a third part, wherein the film thickness of the second part is less than or greater than the film thickness of the first part and the third part, and the film thickness of the first part and the third part are equal.

[0046] In this way, when the light emitted by the organic light-emitting layer passes through the three parts of the layer with varying thickness (such as the hole transport layer) and is emitted outward, it can form two spectra (different thicknesses correspond to different center wavelengths). The symmetrical distribution of the film thickness is beneficial to improving the synthesis efficiency and quality of the spectrum.

[0047] In one example, reference Figure 4The hole transport layer 20 is a thickness-varying layer, comprising a first portion 20d, a second portion 20e, and a third portion 20f. The first portion 20d and the third portion 20f have equal film thicknesses, the second portion 20d has the smallest film thickness, and the film thickness of the hole transport layer 20 is symmetrically distributed with respect to the second portion.

[0048] In another example, refer to Figure 5 In the hole transport layer 20, the first part 20g and the third part 20i have the same film thickness, the second part 20h has the largest film thickness, and the film thickness of the hole transport layer 20 is symmetrically distributed with respect to the second part.

[0049] refer to Figure 6 The thickness-varying layer comprises a first part, a second part, and a third part, with equal thickness differences between the three parts. This stepped thickness distribution allows light emitted from the organic light-emitting layer to form three spectra (corresponding to three different center wavelengths) when it passes through the three different thicknesses of the thickness-varying layer (e.g., a hole transport layer). This stepped thickness distribution improves the synthesis efficiency and quality of the three spectra, allowing for the synthesis of a single, high-quality, and broad spectrum from three different spectra. Compared to a two-part thickness-varying layer, the greater number of parts in the thickness-varying layer helps increase the spectral width of the new spectrum, thereby further improving the uniformity of light intensity distribution in all directions and mitigating brightness attenuation at different viewing angles. However, the greater number of parts makes the fabrication method relatively complex.

[0050] In one example, the hole transport layer 20 is a thickness variation layer, which includes a first part 20a, a second part 20b and a third part 20c, and the difference in film thickness between the first part 20a, the second part 20b and the third part 20c is equal, that is, the film thickness varies in a step.

[0051] Furthermore, the proportion of the surface area of ​​the portion of the film layer with different thicknesses that faces away from the anode layer to the surface area of ​​the portion with varying thicknesses that faces away from the anode layer on the anode layer ranges from 10% to 90%.

[0052] For example, refer to Figure 2 The hole transport layer 20 is a thickness variation layer, which includes a first part 21 and a second part. The orthogonal projection area of ​​the surface of the first part 21 or the second part 22 away from the anode layer 10 on the anode layer 10 is S21 and S22, respectively. The orthogonal projection area of ​​the surface of the thickness variation layer 20 away from the anode layer on the anode layer is S. The proportion of the first part 21 or the second part 22 to the orthogonal projection area S of the surface of the thickness variation layer 20 away from the anode layer on the anode layer ranges from 10% to 90%.

[0053] It is worth noting that when the light emitted from the organic light-emitting layer 30 passes through the first part 21 and the second part 22 of the hole transport layer 20, the intensity of the emitted light from the first part 21 is proportional to the projected area S21 of the surface of the first part facing away from the anode layer 10 on the anode layer 10, and the intensity of the emitted light from the second part is proportional to the projected area S22 of the surface of the second part facing away from the anode layer 10 on the anode layer 10. When two different center wavelengths of light are combined, if the intensity difference is large, the synthesized new spectrum may be biased towards the wavelength with the larger intensity. Moreover, the quality and synthesis efficiency of the synthesized spectrum will decrease significantly. Therefore, when synthesizing a new spectrum, when the ratio of the intensity of the emitted light passing through the first or second part to the intensity of the emitted light passing through the entire thickness variation layer is between 0.1 and 0.9, it is beneficial to synthesize a new spectrum with a wider spectral width than any one of its individual spectra, thereby helping to improve the brightness attenuation at different viewing angles.

[0054] Preferably, refer to Figure 2 When the orthogonal projection area S21 or S22 of the surface of the first part 21 or the second part 22 away from the anode layer 10 on the anode layer 10 accounts for 50% of the orthogonal projection area S of the entire thickness variation layer 20 away from the anode layer 10 on the anode layer 10, that is, when the orthogonal projection area S21 of the surface of the first part 21 away from the anode layer 10 on the anode layer 10 and the orthogonal projection area S22 of the surface of the second part 22 away from the anode layer 10 on the anode layer 10 are equal, the light intensity of the emitted light generated by the first part is equal to the light intensity of the emitted light generated by the second part, which is beneficial to improving the quality and efficiency of the synthesized spectrum.

[0055] In one example, reference Figure 10 The hole transport layer may include a first portion 21 and a second portion 22. The thickness of the first portion 21 is... The thickness of part 22 is The ratio of the projected area S21 of the surface of the first part 21 facing away from the anode layer 10 to the projected area S22 of the surface of the second part 22 facing away from the anode layer 10 is equal to 1. Correspondingly, the center wavelength of the emitted light from the first part is 460 nm, and the full width at half maximum (FWHM) is 15.5 nm. The center wavelength of the emitted light from the second part is 470 nm, and the FWHM is 17.5 nm. Thus, the center wavelength of the synthesized new spectrum is around 467 nm, and the FWHM is 23 nm. Compared with the center wavelength and FWHM generated by the first and second parts, the spectral width of the new spectrum is significantly improved. Moreover, the center wavelength of the synthesized new spectrum can be flexibly selected according to the film thickness of the first and second parts according to actual needs.

[0056] refer to Figure 11Different film thickness differences produce different center wavelengths, thus synthesizing new spectra with different widths. The projected areas of the first and second parts are equal, and their thicknesses are... In this case, the full width at half maximum (FWHM) of the synthesized new spectrum can have a certain linear relationship with the interval between the two different sets of center wavelengths. Thus, different wavelength differences can be designed to obtain layers with varying thicknesses, as needed.

[0057] refer to Figure 7 The organic light-emitting device 100 may further include a substrate 5. When the anode layer 10 is a reflective layer and the cathode layer 50 is a semi-reflective layer, the anode layer 10, hole transport layer 20, organic light-emitting layer 30, electron transport layer 40, and cathode layer 50 are sequentially stacked on the substrate 5 from bottom to top. Of course, it may also include an electron blocking layer, hole blocking layer, or other film layers; no specific limitations are made here.

[0058] In this way, the light emitted by the organic light-emitting layer 30 passes through the first and second parts of the hole transport layer 20, which have different film thicknesses, and is reflected by the anode layer 10. After passing through the hole transport layer 20, the organic light-emitting layer 30, the electron transport layer 40, and the cathode layer 50, it is emitted outward. This can form two sets of emitted light with different center wavelengths, and synthesize a new spectrum with a wider spectral width than any one of them. This helps to improve the brightness attenuation at different viewing angles and improve the display effect during daily use.

[0059] In another example, refer to Figure 8 With the cathode layer 15 being a reflective layer and the anode layer 55 being a semi-reflective and semi-transparent layer, the cathode layer 15, electron transport layer 25, organic light-emitting layer 35, hole transport layer 45, and anode layer 55 are sequentially stacked on the substrate 5 from bottom to top. In this way, the light emitted from the organic light-emitting layer 35, after passing through the first and second portions of the hole transport layer 45 with different film thicknesses, and then emitted outwards through the anode layer, can form two sets of emitted light with different center wavelengths, and synthesize a new spectrum with a wider spectral width than any one of its individual spectra. This helps to improve brightness attenuation at different viewing angles and enhances the display effect during daily use.

[0060] Because of the microcavity structure formed by the anode and cathode layers, light can undergo multiple reflections and interferences between the anode and cathode layers to enhance the output of light at specific wavelengths. Therefore, the hole transport layer, as a thickness-varying layer, can be used in inverted light-emitting devices (i.e., the cathode layer acts as a reflective layer, see reference). Figure 7 This also applies to upright light-emitting devices (i.e., the anode layer acts as the reflective layer, see reference). Figure 8 ).

[0061] The following is combined with Figure 9The fabrication method of an organic light-emitting device 100 provided in this disclosure will be described exemplarily, taking as an example an anode layer 10, a hole transport layer 20, an organic light-emitting layer 30, an electron transport layer 40, and a cathode layer 50 sequentially stacked from bottom to top on a substrate 5 (see reference). Figure 7 ).

[0062] S11, Prepare substrate 5 and anode layer 10 on substrate 5.

[0063] Specifically, an anode conductive material can be deposited on substrate 5 using methods such as magnetron sputtering. Commonly used anode materials include high work function metals or metal oxides such as indium tin oxide (ITO).

[0064] S12, the second portion 22 of the hole transport layer 20 is prepared at the corresponding position of the second portion 22 on the anode layer 10.

[0065] Specifically, organic materials for preparing the hole transport layer can be deposited on the anode layer 10 by means of magnetron sputtering or other methods, with a preference for preparing the thinner second part of the film. The second part at the corresponding location is then prepared using a corresponding mask. Alternatively, the second part of the hole transport layer can also be prepared by vapor deposition; this is not specifically limited here.

[0066] By prioritizing the preparation of the thinner second part of the hole transport layer, it is beneficial to control the thickness of the first part of the film layer based on the thickness of the second part.

[0067] In another example, a full-length hole transport layer with a thickness equal to that of the second portion is prepared on the anode, and then deposition continues at the corresponding position of the first portion to form the first portion of the film thickness.

[0068] S13, a first portion 21 of the hole transport layer 20 is prepared at the position corresponding to the first portion 21 on the anode layer 10. The film thickness of the first portion 21 is greater than the film thickness of the second portion 22, so as to form at least two sets of emitted light with different center wavelengths.

[0069] Specifically, a thin first portion 21 can be deposited on the anode layer 10 by means of magnetron sputtering or other methods. The first portion 21 at the corresponding location is then obtained using a corresponding mask. Alternatively, the first portion of the hole transport layer can also be prepared by vapor deposition; this is not specifically limited here.

[0070] S14, an organic light-emitting layer 30, an electron transport layer 40, and a cathode layer 50 are sequentially prepared on the hole transport layer 20.

[0071] Specifically, the organic light-emitting layer 30, the electron transport layer 40, and the cathode layer 50 are successively prepared by magnetron sputtering combined with a photomask or vacuum evaporation. The organic light-emitting layer 30 can be deposited on the hole transport layer 20 by magnetron sputtering to obtain the film thickness of the organic light-emitting layer 30, and the pattern of the organic light-emitting layer 30 is prepared using a corresponding photomask. Similarly, the electron transport layer 40 and the cathode layer 50 can be successively deposited on the organic light-emitting layer 30 by magnetron sputtering to obtain the corresponding film thickness and pattern.

[0072] Of course, the preparation method of the structure in which the cathode layer 15, electron transport layer 25, organic light-emitting layer 34, hole transport layer 45 and anode layer 55 are stacked sequentially from bottom to top on the substrate 5 is similar to the preparation method described above, and will not be repeated here.

[0073] One embodiment of this disclosure also provides an organic light-emitting panel, including multiple organic light-emitting devices, such as multiple organic light-emitting devices of different colors (e.g., R, G, and B). Each organic light-emitting device has an anode layer, a hole transport layer, an organic light-emitting layer, an electron transport layer, and a cathode layer stacked sequentially, and at least one of the anode layer, hole transport layer, and electron transport layer is a thickness-varying layer. The thickness-varying layer includes at least two portions with different film thicknesses, so that when light emitted from the organic light-emitting layer passes through the portions with different film thicknesses in the thickness-varying layer, at least two sets of emitted light with different center wavelengths are formed. In this way, organic light-emitting devices of different colors can each form at least two sets of emitted light with different center wavelengths to synthesize a new spectrum with a wider spectral width than any one of their individual spectra, thereby helping to improve brightness attenuation at different viewing angles and improving the display effect during daily use.

[0074] At least one embodiment of this disclosure provides a display device, which may include the display panel described in the above embodiments. For example, in embodiments of this disclosure, the display device may be any product or component with display functionality, such as a television, digital camera, mobile phone, watch, tablet computer, laptop computer, or navigator.

[0075] The above are merely preferred embodiments of this specification and are not intended to limit this specification. Any modifications or equivalent substitutions made within the spirit and principles of this specification shall be included within the scope of protection of this specification.

Claims

1. An organic light-emitting device, characterized in that, include: The anode layer, hole transport layer, organic light-emitting layer, electron transport layer, and cathode layer are stacked sequentially, wherein at least one of the anode layer, hole transport layer, and electron transport layer is a layer with varying thickness. The thickness variation layer includes at least two portions with different film thicknesses, so that when the light emitted by the organic light-emitting layer passes through the portions with different film thicknesses in the thickness variation layer and is emitted outward, at least two sets of emitted light with different center wavelengths are formed respectively.

2. In the organic light-emitting device according to claim 1, the thickness difference between the thickest and thinnest portion of at least two portions with different film thicknesses is: Preferably, the thickness difference between the thickest and thinnest portion of at least two portions with different film thicknesses is .

3. In the organic light-emitting device according to claim 1, the proportion of the surface of the portion of the film layer with different thicknesses facing away from the anode layer to the surface of the thickness-varying layer facing away from the anode layer on the anode layer is between 10% and 90%.

4. The organic light-emitting device according to claim 1, wherein the thickness variation layer comprises a first part and a second part, and the film thickness of the first part is greater than the film thickness of the second part.

5. The organic light-emitting device according to claim 1, wherein the thickness variation layer comprises a first portion, a second portion, and a third portion, and the thickness difference between the first portion, the second portion, and the third portion is equal.

6. The organic light-emitting device according to claim 4, wherein the projected area of ​​the surface of the first portion or the second portion facing away from the anode layer on the anode layer accounts for a proportion of the projected area of ​​the surface of the thickness variation layer facing away from the anode layer on the anode layer ranging from 10% to 90%. Preferably, the ratio of the orthogonal projection area of ​​the surface of the first portion or the second portion away from the anode layer on the anode layer to the orthogonal projection area of ​​the surface of the thickness variation layer away from the anode layer on the anode layer is equal to 50%.

7. The organic light-emitting device according to any one of claims 1 to 6, wherein the thickness variation layer is the hole transport layer.

8. The organic light-emitting device according to claim 1, characterized in that, It also includes the substrate, When the anode layer is a reflective layer and the cathode layer is a semi-reflective and semi-transparent layer, the anode layer, the hole transport layer, the organic light-emitting layer, and the cathode layer are sequentially stacked on the substrate from bottom to top. When the cathode layer is a reflective layer and the anode layer is a semi-reflective and semi-transparent layer, the cathode layer, the electron transport layer, the organic light-emitting layer, the hole transport layer and the anode layer are sequentially stacked on the substrate from bottom to top.

9. A method for fabricating an organic light-emitting device, characterized in that, Prepare a substrate and an anode layer on the substrate; The second portion of the hole transport layer is prepared at the corresponding position of the second portion on the anode layer; A first portion of the hole transport layer is prepared at a position corresponding to the first portion on the anode layer. The film thickness of the first portion is greater than that of the second portion, so as to form at least two sets of emitted light with different center wavelengths. An organic light-emitting layer, an electron transport layer, and a cathode layer are sequentially fabricated on the hole transport layer.

10. An organic light-emitting panel, characterized in that, It includes a plurality of organic light-emitting devices as described in any one of claims 1 to 8.

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