Light emitting device, display panel, and display apparatus

Abstract

The application provides a light-emitting device, a display panel and a display device. The light-emitting device comprises: a light-emitting device layer comprising a first light-emitting layer, a second light-emitting layer, a third light-emitting layer and a semi-conductive layer arranged in layers, the light-emitting colors of any two adjacent layers among the first light-emitting layer, the second light-emitting layer and the third light-emitting layer are different, and the semi-conductive layer is arranged between the first light-emitting layer and the second light-emitting layer and between the second light-emitting layer and the third light-emitting layer; a common electrode layer arranged on the side of the first light-emitting layer away from the second light-emitting layer; a first electrode comprising a first sub-electrode, a second sub-electrode and a third sub-electrode, the first sub-electrode is in conductive connection with the first light-emitting layer, the second sub-electrode is in conductive connection with the second light-emitting layer, and the third sub-electrode is in conductive connection with the third light-emitting layer; and the semi-conductive layer allows the first particles to pass through and blocks the second particles. The light-emitting device provided by the application can reduce color deviation and realize multi-color display, and when the light-emitting device is used in the display panel, the pixel density of the display panel can be improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of display, in particular to a light-emitting device, a display panel and a display device. BACKGROUND

[0002] The display panel is widely used in electronic devices such as mobile phones, tablets, displays and televisions due to its advantages of panelization, low power consumption, no electromagnetic radiation, high resolution, high contrast, easy integration and lightness. With the development of display technology, the display panel is no longer just a carrier for conveying text information. It can realize traffic positioning, mobile payment, video chat, email sending and receiving and other functions, providing people with rich personal experience and communication anytime and anywhere. Therefore, users have higher and higher performance requirements for display panels.

[0003] However, the performance of the display panel needs to be improved. SUMMARY

[0004] The present application provides a light-emitting device, a display panel and a display device, which are beneficial to improve the performance of the display panel.

[0005] In a first aspect, the light-emitting device provided by the embodiments of the present application comprises a light-emitting device layer, a common electrode layer and a first electrode. The light-emitting device layer comprises a semi-conductive and semi-resistive layer, and a first light-emitting layer, a second light-emitting layer and a third light-emitting layer which are sequentially stacked. The light-emitting colors of any two adjacent layers among the first light-emitting layer, the second light-emitting layer and the third light-emitting layer are different. The semi-conductive and semi-resistive layer is arranged between the first light-emitting layer and the second light-emitting layer and between the second light-emitting layer and the third light-emitting layer. The common electrode layer is arranged on the side of the first light-emitting layer away from the second light-emitting layer, and the common electrode layer provides first particles to the light-emitting device layer. The polarity of the first electrode is opposite to that of the common electrode, and the first electrode provides second particles to the light-emitting device layer. The first electrode comprises a first sub-electrode, a second sub-electrode and a third sub-electrode which are insulated from each other. The first sub-electrode is conductively connected with the first light-emitting layer, the second sub-electrode is conductively connected with the second light-emitting layer, and the third sub-electrode is conductively connected with the third light-emitting layer. The semi-conductive and semi-resistive layer is configured to allow the first particles to pass through and block the second particles.

[0006] In some embodiments, the light-emitting device layer comprises a first through hole and a second through hole. The first through hole penetrates the third light-emitting layer and the second light-emitting layer, and the second through hole penetrates the third light-emitting layer. The first sub-electrode is arranged in the first through hole and is insulated from the third light-emitting layer and the second light-emitting layer, respectively. The second sub-electrode is arranged in the second through hole and is insulated from the third light-emitting layer.

[0007] In some embodiments, the light-emitting device layer further comprises an insulating layer. The insulating layer is arranged between the inner wall of the first through hole and the first sub-electrode, and between the inner wall of the second through hole and the second sub-electrode.

[0008] In some embodiments, the insulating layer is further disposed on a side of the light-emitting device layer away from the common electrode layer, and between any two of the first sub-electrode, the second sub-electrode, and the third sub-electrode.

[0009] In some embodiments, the common electrode layer is an anode, and the first electrode is a cathode.

[0010] In some embodiments, the material of the semi-conductive and semi-resistive layer includes P-doped aluminum gallium nitride; and / or, the material of the semi-conductive and semi-resistive layer includes undoped gallium nitride.

[0011] In some embodiments, the light-emitting device further comprises a particle injection layer, the particle injection layer being disposed between the common electrode layer and the first light-emitting layer, and the particle injection layer injecting the first particles into the light-emitting device layer.

[0012] In some embodiments, the common electrode layer is an anode, and the material of the particle injection layer includes P-doped aluminum gallium nitride.

[0013] In some embodiments, the light-emitting device layer further comprises a particle transport layer, the particle transport layer being disposed between the semi-conductive and semi-resistive layer and the first light-emitting layer, between the semi-conductive and semi-resistive layer and the second light-emitting layer, and on a side of the third light-emitting layer away from the second light-emitting layer, and the first sub-electrode, the second sub-electrode, and the third sub-electrode are respectively electrically connected to the particle transport layer.

[0014] In some embodiments, the first electrode is a cathode, and the material of the particle transport layer includes n-type gallium nitride.

[0015] In some embodiments, the thickness h of the particle transport layer satisfies: 5nm≤h≤50nm.

[0016] In some embodiments, the common electrode layer is transparent.

[0017] In some embodiments, the material of the common electrode layer includes indium tin oxide.

[0018] In some embodiments, the wavelength of the light emitted by the first light-emitting layer is shorter than the wavelength of the light emitted by the second light-emitting layer, and the wavelength of the light emitted by the second light-emitting layer is shorter than the wavelength of the light emitted by the third light-emitting layer.

[0019] In some embodiments, the first light-emitting layer, the second light-emitting layer, and the third light-emitting layer are respectively configured to emit one of red light, blue light, and green light.

[0020] In some embodiments, the first light-emitting layer is configured to emit blue light, the second light-emitting layer is configured to emit green light, and the third light-emitting layer is configured to emit red light.

[0021] In a second aspect, the embodiments of the present application provide a display panel comprising an array substrate and a plurality of light emitting devices as provided in any of the above embodiments. The plurality of light emitting devices are arranged at intervals on the array substrate, and the array substrate is electrically connected with the first electrode to drive the light emitting devices to emit light.

[0022] In some embodiments, the at least two light emitting devices share a common electrode layer.

[0023] In a third aspect, the embodiments of the present application provide a display device comprising the display panel as provided in any of the above embodiments.

[0024] The light emitting device, the display panel and the display device provided by the embodiments of the present application have the following advantages. The light emitting device layer comprises a first light emitting layer, a second light emitting layer and a third light emitting layer, and the light emitting colors of any two adjacent ones of the first light emitting layer, the second light emitting layer and the third light emitting layer are different. The first light emitting layer, the second light emitting layer and the third light emitting layer are respectively driven by the first sub-electrode, the second sub-electrode and the third sub-electrode to emit light independently. On the premise of realizing multi-color display of the light emitting device, the second particles are prevented from migrating between any two adjacent ones of the first light emitting layer, the second light emitting layer and the third light emitting layer by the semi-blocking layer, so as to reduce the risk of interference of the first light emitting layer, the second light emitting layer and the third light emitting layer, and to reduce the risk of color deviation of the light emitting device. In the case where the light emitting device is applied to the display panel, the light emitting device occupies a small area and can realize multi-color display, which is conducive to improving the effective light emitting area and pixel arrangement density of the display panel, and reducing the risk of color deviation of the display panel, and thus improving the display effect of the display panel. BRIEF DESCRIPTION OF DRAWINGS

[0025] Features, advantages, and technical effects of the exemplary embodiments of the present application will be described below with reference to the accompanying drawings. In the drawings, the same components are denoted by the same reference numerals. The drawings are not drawn to scale.

[0026] Figure 1 A top view of a light emitting device provided by an embodiment of the present application;

[0027] Figure 2 A top view of a light emitting device provided by an embodiment of the present application; Figure 1 A sectional structure schematic view along A-A;

[0028] Figure 3 A top view of a light emitting device provided by an embodiment of the present application;

[0029] Figure 4 A top view of a light emitting device provided by an embodiment of the present application; Figure 3 A sectional structure schematic view along B-B;

[0030] Figure 5 A sectional structure schematic view along B-B; Figure 3 Another sectional structure schematic view along B-B;

[0031] Figure 6 FIG. 1 is a schematic diagram of a cross-sectional structure along A-A of a display panel according to an embodiment of the present application; Figure 3 FIG. 2 is a schematic diagram of a cross-sectional structure along B-B of the display panel according to the embodiment of the present application;

[0032] Figure 7 FIG. 3 is a top view of the display panel according to the embodiment of the present application;

[0033] Figure 8 FIG. 4 is a schematic diagram of a cross-sectional structure along C-C of the display panel according to the embodiment of the present application; Figure 7

[0034] Figure 9 FIG. 5 is a top view of the display device according to the embodiment of the present application.

[0035] In the drawings, the drawings are not necessarily drawn according to scale.

[0036] Legend of reference signs:

[0037] 100, display panel;

[0038] 110, array substrate;

[0039] 20, light emitting device;

[0040] 21, light emitting device layer; 21a, first via hole; 21b, second via hole; 211, first light emitting layer; 212, second light emitting layer; 213, third light emitting layer; 214, semi-permeable layer; 215, particle transport layer;

[0041] 22, common electrode layer;

[0042] 23, first electrode; 231, first sub-electrode; 232, second sub-electrode; 233, third sub-electrode;

[0043] 24, insulating layer;

[0044] 25, particle injection layer;

[0045] 10, display device. DETAILED DESCRIPTION

[0046] ​Features and exemplary embodiments of various aspects of the present application will be described in detail below. In the following detailed description, numerous specific details are set forth in order to provide a thorough understanding of the present application. However, it will be apparent to one of ordinary skill in the art that the present application can be practiced without some of these specific details. The description of the embodiments is merely intended to provide a more detailed understanding of the present application. In the drawings and the following description, well-known structures and techniques have not been shown in order to avoid obscuring the present application; and, for clarity, the dimensions of some structures can be exaggerated.

[0047] In addition, the size and thickness of each configuration shown in the drawings are arbitrarily shown for understanding and ease of description, but the present concept is not limited thereto. In the drawings, the thickness of layers, films, panels, and regions, etc. is exaggerated for clarity. In the drawings, the thickness of some layers and regions is exaggerated for better understanding and ease of description.

[0048] It can be understood that when an element such as a layer, film, region, or substrate is referred to as being "on" another element, it can be directly on the other element, or intervening elements can also be present. In contrast, when an element is referred to as being "directly on" another element, there are no intervening elements present. In addition, throughout the specification, the word "on" means positioned on top of or below, and does not necessarily mean positioned "at the upper side" based on the direction of gravity.

[0049] In addition, unless explicitly described to the contrary, the word "comprise" will be understood to imply the inclusion of stated elements but not the exclusion of any other elements.

[0050] Display panels are widely used in electronic devices such as mobile phones and tablets. In order to realize the display function of the display panel, such as an OLED (Organic Light Emitting Diode) or a Micro-LED (Micro Light Emitting Diode) display panel, a light emitting device is usually arranged inside the display panel. The larger the effective light emitting area of the light emitting device in the display panel and the tighter the arrangement of the light emitting device, the more conducive to improving the PPI (Pixels Per Inch) of the display panel.

[0051] However, in the related art, in order to improve the PPI of the display panel, the light emitting structures for emitting different colors in the display panel interfere with each other, which easily causes the display panel to have color deviation, and seriously affects the display effect of the display panel.

[0052] In view of this, the present application provides a light-emitting device, a display panel and a display device, which will be described below in conjunction with the accompanying drawings.

[0053] As shown in Figure 1 and Figure 2 The light-emitting device 20 provided by the present application comprises a light-emitting device layer 21, a common electrode layer 22 and a first electrode 23. The light-emitting device layer 21 comprises a semi-conductive and semi-resistive layer 214 and a first light-emitting layer 211, a second light-emitting layer 212 and a third light-emitting layer 213 which are sequentially stacked. The light-emitting colors of any two adjacent ones of the first light-emitting layer 211, the second light-emitting layer 212 and the third light-emitting layer 213 are different. The semi-conductive and semi-resistive layer 214 is arranged between the first light-emitting layer 211 and the second light-emitting layer 212 and between the second light-emitting layer 212 and the third light-emitting layer 213. The common electrode layer 22 is arranged on the side of the first light-emitting layer 211 away from the second light-emitting layer 212, and the common electrode layer 22 provides first particles to the light-emitting device layer 21. The first electrode 23 is opposite in polarity to the common electrode layer 22, and the first electrode 23 provides second particles to the light-emitting device layer 21. The first electrode 23 comprises a first sub-electrode 231, a second sub-electrode 232 and a third sub-electrode 233 which are insulated from each other. The first sub-electrode 231 is conductively connected to the first light-emitting layer 211. The second sub-electrode 232 is conductively connected to the second light-emitting layer 212. The third sub-electrode 233 is conductively connected to the third light-emitting layer 213. The semi-conductive and semi-resistive layer 214 is configured to allow the first particles to pass through and to block the second particles.

[0054] The light-emitting colors of any two adjacent ones of the first light-emitting layer 211, the second light-emitting layer 212 and the third light-emitting layer 213 are different. The light-emitting colors of the first light-emitting layer 211 and the second light-emitting layer 212 are different. The light-emitting colors of the second light-emitting layer 212 and the third light-emitting layer 213 are different. The light-emitting colors of the first light-emitting layer 211 and the third light-emitting layer 213 can be the same or different.

[0055] Exemplarily, the first light-emitting layer 211, the second light-emitting layer 212 and the third light-emitting layer 213 can be configured to emit different colors of light, and the first light-emitting layer 211, the second light-emitting layer 212 and the third light-emitting layer 213 are stacked. The three layers can simultaneously or respectively emit light along the same side of the stacking direction of the three layers, and the light-emitting of one or more of the first light-emitting layer 211, the second light-emitting layer 212 and the third light-emitting layer 213 can be controlled, such as the light-emitting brightness, so that one or more of the three layers emit light along the same direction in the stacking direction and mix, thereby realizing the light-emitting device 20 emitting more diverse colors.

[0056] Optionally, the first light-emitting layer 211, the second light-emitting layer 212 and the third light-emitting layer 213 can be respectively used to emit one of red light, green light and blue light. By controlling whether the first light-emitting layer 211, the second light-emitting layer 212 and the third light-emitting layer 213 emit light and the light-emitting brightness, etc., the light-emitting device 20 can emit red light, blue light, green light or a mixture of at least two of red light, blue light and green light at any brightness, thereby realizing the multi-color light emission of the light-emitting device 20.

[0057] That is, by controlling whether the first light-emitting layer 211, the second light-emitting layer 212 and the third light-emitting layer 213 emit light and the light-emitting brightness, etc., the light-emitting device 20 can emit more colorful colors. When the light-emitting device 20 is applied to the display panel 100 as shown in the figure, the first light-emitting layer 211, the second light-emitting layer 212 and the third light-emitting layer 213 of the light-emitting device 20 can be stacked in the thickness direction of the display panel 100. In this way, the single light-emitting device 20 occupies a smaller area of the display panel 100, and can display more colorful colors, which is beneficial to improve the PPI of the display panel 100. Figure 7

[0058] When the common electrode layer 22 and the first electrode 23 are opposite in polarity, the common electrode layer 22 can be set as an anode, and the first electrode 23 can be set as a cathode, or the common electrode layer 22 can be set as a cathode, and the first electrode 23 can be set as an anode. The first particles generated by the common electrode layer 22 can migrate to the first light-emitting layer 211, the second light-emitting layer 212 and the third light-emitting layer 213, and the second particles generated by the first sub-electrode 231, the second sub-electrode 232 and the third sub-electrode 233 of the first electrode 23 can respectively migrate to the first light-emitting layer 211, the second light-emitting layer 212 and the third light-emitting layer 213. In this way, the first particles and the second particles are respectively recombined in the first light-emitting layer 211, the second light-emitting layer 212 and the third light-emitting layer 213, so that the first light-emitting layer 211, the second light-emitting layer 212 and the third light-emitting layer 213 emit light independently.

[0059] For example, when the common electrode layer 22 is an anode and the first electrode 23 is a cathode, the first particles are holes and the second particles are electrons. The holes generated by the common electrode layer 22 and the electrons generated by the first sub-electrode 231 are recombined in the first light-emitting layer 211, so as to realize the light emission of the first light-emitting layer 211. Similarly, the electrons generated by the second sub-electrode 232 and the holes generated by the common electrode layer 22 are recombined in the second light-emitting layer 212, so as to realize the light emission of the second light-emitting layer 212. The electrons generated by the third sub-electrode 233 and the holes generated by the common electrode layer 22 are recombined in the third light-emitting layer 213, so as to realize the light emission of the third light-emitting layer 213.

[0060] ​The first sub-electrode 231 is conductively connected with the first light-emitting layer 211, so that the second particles generated by the first sub-electrode 231 can migrate into the first light-emitting layer 211. Similarly, the second particles generated by the second sub-electrode 232 and the third sub-electrode 233 can migrate into the second light-emitting layer 212 and the third light-emitting layer 213, respectively.

[0061] It can be understood that the first light-emitting layer 211, the second light-emitting layer 212 and the third light-emitting layer 213 can independently emit light and control the brightness of the light emitted by the first light-emitting layer 211, the second light-emitting layer 212 and the third light-emitting layer 213, respectively, by controlling whether the first sub-electrode 231, the second sub-electrode 232 and the third sub-electrode 233 are powered on and the size of the voltage or current, respectively.

[0062] Since the semi-permeable layer 214 allows the first particles to pass through but prevents the second particles from passing through, the first particles generated when the common electrode layer 22 is powered on can migrate into the first light-emitting layer 211, and then migrate into the second light-emitting layer 212 through the first light-emitting layer 211 and the semi-permeable layer 214, and then migrate into the third light-emitting layer 213 through the second light-emitting layer 212 and the semi-permeable layer 214. That is, the common electrode layer 22 provides the first light-emitting layer 211, the second light-emitting layer 212 and the third light-emitting layer 213 with the first particles.

[0063] The first sub-electrode 231 can be disposed in the third light-emitting layer 213 and the second light-emitting layer 212 and insulated therefrom, and the first light-emitting layer 211 and the second light-emitting layer 212, and the second light-emitting layer 212 and the third light-emitting layer 213 each have a semi-permeable layer 214 therebetween, and the semi-permeable layer 214 can prevent the second particles from passing through. Therefore, the second particles generated by the first sub-electrode 231 will not migrate into the third light-emitting layer 213 and the second light-emitting layer 212, and the second particles generated by the second sub-electrode 232 will not migrate into the first light-emitting layer 211 and the third light-emitting layer 213, and the second particles generated by the third sub-electrode 233 will not migrate into the second light-emitting layer 212 and the first light-emitting layer 211. In this way, the first light-emitting layer 211, the second light-emitting layer 212 and the third light-emitting layer 213 can independently emit light, reducing the risk of mutual interference of the first light-emitting layer 211, the second light-emitting layer 212 and the third light-emitting layer 213.

[0064] The first sub-electrode 231, the second sub-electrode 232 and the third sub-electrode 233 are insulated from each other and are electrically connected with the relevant driving devices on the side of the light-emitting device layer 21 away from the common electrode layer 22, so as to drive the first light-emitting layer 211, the second light-emitting layer 212 and the third light-emitting layer 213 of the light-emitting device 20 to independently emit light, respectively.

[0065] Optionally, the first sub-electrode 231, the second sub-electrode 232 and the third sub-electrode 233 can respectively extend along the stacking direction and be electrically connected with the driving device of the display panel 100, or the first sub-electrode 231, the second sub-electrode 232 and the third sub-electrode 233 respectively form corresponding patterns on the side of the light-emitting device layer 21 away from the common electrode layer 22 to be connected with the connection wires in the driving device.

[0066] It can be understood that the light-emitting device 20 provided by the embodiments of the present application can be applied to an OLED display panel or a Micro-LED display panel.

[0067] In the case where the light-emitting device 20 is applied to the display panel 100, a single light-emitting device 20 can realize multi-color display, so that it is not necessary to arrange sub-pixels respectively emitting different colors of light in the display panel 100, and a single light-emitting device 20 can realize multi-color display with a smaller area, which is conducive to improving the pixel density of the display panel 100.

[0068] The light-emitting device 20 provided by the embodiments of the present application sets the light-emitting device layer 21 to include the first light-emitting layer 211, the second light-emitting layer 212 and the third light-emitting layer 213, and the light-emitting colors of any two adjacent ones of the first light-emitting layer 211, the second light-emitting layer 212 and the third light-emitting layer 213 are different, the first sub-electrode 231, the second sub-electrode 232 and the third sub-electrode 233 respectively drive the first light-emitting layer 211, the second light-emitting layer 212 and the third light-emitting layer 213 to emit light independently, on the premise of realizing multi-color display of the light-emitting device 20, the semi-blocking layer 214 prevents the second particles from migrating between any two adjacent ones of the first light-emitting layer 211, the second light-emitting layer 212 and the third light-emitting layer 213, so as to reduce the risk of interference of the light emission of the first light-emitting layer 211, the second light-emitting layer 212 and the third light-emitting layer 213, which is conducive to improving the accuracy of the light-emitting color of the light-emitting device 20. In the case where the light-emitting device 20 is applied to the display panel 100, the light-emitting device 20 occupies a smaller area and can realize multi-color display, which is conducive to improving the effective light-emitting area and the pixel arrangement density of the display panel 100, and reducing the risk of color deviation of the display panel 100, thereby improving the display effect of the display panel 100.

[0069] Please continue to refer to Figure 1 and Figure 2In some embodiments, the light-emitting device layer 21 comprises a first through-hole 21a and a second through-hole 21b, the first through-hole 21a penetrating the third light-emitting layer 213 and the second light-emitting layer 212, and the second through-hole 21b penetrating the third light-emitting layer 213; the first sub-electrode 231 is arranged in the first through-hole 21a and is insulated from the third light-emitting layer 213 and the second light-emitting layer 212, respectively; and the second sub-electrode 232 is arranged in the second through-hole 21b and is insulated from the third light-emitting layer 213.

[0070] The first through-hole 21a penetrates the third light-emitting layer 213 and the second light-emitting layer 212, and of course, the first through-hole 21a also penetrates the semi-permeable layer 214 between the third light-emitting layer 213 and the second light-emitting layer 212, that is, the first through-hole 21a penetrates the second light-emitting layer 212 and the film layer on the side of the second light-emitting layer 212 away from the first light-emitting layer 211, so that the first sub-electrode 231 can be conductively connected to the first light-emitting layer 211 after being arranged in the first through-hole 21a.

[0071] The first sub-electrode 231 is insulated from the third light-emitting layer 213 and the second light-emitting layer 212, so that the second particles generated by the first sub-electrode 231 under the condition of being powered on will not be transmitted into the third light-emitting layer 213 and the second light-emitting layer 212. The second sub-electrode 232 is insulated from the third light-emitting layer 213, so that the second particles generated by the second sub-electrode 232 under the condition of being powered on will not be transmitted into the third light-emitting layer 213.

[0072] The first sub-electrode 231 can be directly connected to the first light-emitting layer 211, or the first sub-electrode 231 can be connected through an intermediate transmission layer to realize the transmission of the second particles from the first sub-electrode 231 to the first light-emitting layer 211. Similarly, the second sub-electrode 232 can be directly connected to the second light-emitting layer 212, or the two can be connected through an intermediate transmission layer.

[0073] Optionally, the cross sections of the first through-hole 21a and the second through-hole 21b can be square, circular or other shapes, which can be selected according to actual needs.

[0074] The first through-hole 21a and the second through-hole 21b can be formed by etching process using a mask after the first light-emitting layer 211, the second light-emitting layer 212 and the third light-emitting layer 213 are prepared, and then the first sub-electrode 231, the second sub-electrode 232 and the third sub-electrode 233 can be formed by deposition process.

[0075] Therefore, the light-emitting device layer 21 is provided with the first through hole 21a and the second through hole 21b, so that the first sub-electrode 231 and the first light-emitting layer 211, and the second sub-electrode 232 and the second light-emitting layer 212 are conductively connected, and the first sub-electrode 231, the second sub-electrode 232 and the third sub-electrode 233 can be led out from the side of the light-emitting device layer 21 away from the common electrode layer 22, so as to facilitate the electrical connection between the first sub-electrode 231, the second sub-electrode 232 and the third sub-electrode 233 and the relevant driving devices of the light-emitting device 20.

[0076] As shown in Figures 1 to 4 some embodiments, the light-emitting device layer 21 further comprises an insulating layer 24, which is arranged between the inner wall of the first through hole 21a and the first sub-electrode 231, and between the inner wall of the second through hole 21b and the second sub-electrode 232.

[0077] The insulating layer 24 can be formed by deposition through a mask plate on the inner wall of the first through hole 21a and the second through hole 21b after etching.

[0078] Optionally, the material of the insulating layer 24 can include one or more of silicon oxide, silicon nitride and aluminum oxide, so as to insulate and separate the first sub-electrode 231 from the second light-emitting layer 212 and the third light-emitting layer 213, and the second sub-electrode 232 from the third light-emitting layer 213, thereby reducing the risk of mutual interference of the first light-emitting layer 211, the second light-emitting layer 212 and the third light-emitting layer 213.

[0079] As shown in Figure 3 and Figure 4 some embodiments, the insulating layer 24 is further arranged on the side of the light-emitting device layer 21 away from the common electrode layer 22, and between any two of the first sub-electrode 231, the second sub-electrode 232 and the third sub-electrode 233.

[0080] In this way, the insulating layer 24 insulates and separates the first sub-electrode 231, the second sub-electrode 232 and the third sub-electrode 233, thereby reducing the risk of mutual short circuit between different first electrodes 23, and the insulating layer 24 can be used to pattern the first sub-electrode 231, the second sub-electrode 232 and the third sub-electrode 233, so as to facilitate the connection of the first sub-electrode 231, the second sub-electrode 232 and the third sub-electrode 233 with the driving devices.

[0081] In some embodiments, the common electrode layer 22 is an anode, and the first electrode 23 is a cathode.

[0082] Thus, the first particle is a hole, the second particle is an electron, and the common electrode layer 22 can be in an electrically connected state at all times, i.e., the common electrode layer 22 can continuously generate holes, while the first electrode 23 needs to have a current passing therethrough to generate electrons in the first sub-electrode 231, the second sub-electrode 232, and the third sub-electrode 233, which is more convenient for controlling the light emission of the first light-emitting layer 211, the second light-emitting layer 212, and the third light-emitting layer 213, respectively.

[0083] In some embodiments, the material of the semi-conductive and semi-resistive layer 214 includes P-type doped aluminum gallium nitride.

[0084] The P-type doped aluminum gallium nitride has good electron blocking performance and can smoothly pass holes, and thus, the material of the semi-conductive and semi-resistive layer 214 includes P-type doped aluminum gallium nitride, which is conducive to further reducing the risk of mutual interference of the light emission of the first light-emitting layer 211, the second light-emitting layer 212, and the third light-emitting layer 213 on the premise of realizing normal light emission of the first light-emitting layer 211, the second light-emitting layer 212, and the third light-emitting layer 213.

[0085] In some embodiments, the material of the semi-conductive and semi-resistive layer 214 includes undoped gallium nitride.

[0086] The undoped gallium nitride has good electron blocking performance and can smoothly pass holes, and thus, the material of the semi-conductive and semi-resistive layer 214 includes P-type doped aluminum gallium nitride, which is conducive to further reducing the risk of mutual interference of the light emission of the first light-emitting layer 211, the second light-emitting layer 212, and the third light-emitting layer 213 on the premise of realizing normal light emission of the first light-emitting layer 211, the second light-emitting layer 212, and the third light-emitting layer 213.

[0087] It can be understood that the material of the semi-conductive and semi-resistive layer 214 can include both P-type doped aluminum gallium nitride and undoped gallium nitride.

[0088] As shown in FIGS. 1, 2, 3, and 4, the light-emitting device 20 further includes a particle injection layer 25, which is disposed between the common electrode layer 22 and the first light-emitting layer 211 and injects the first particles into the light-emitting device layer 21. Figure 3 Figure 5 In the case where the common electrode layer 22 is an anode, the particle injection layer 25 is a hole injection layer and can improve the uniformity of hole injection into the first light-emitting layer 211.

[0089] In the case where the common electrode layer 22 is an anode, the particle injection layer 25 is a hole injection layer and can improve the uniformity of hole injection into the first light-emitting layer 211.

[0090] ​The particle injection layer 25 can cover the first light-emitting layer 211. In this way, the particle injection layer 25 can make the first particles more evenly injected into the first light-emitting layer 211 in various areas, and then make the first particles more evenly injected into the second light-emitting layer 212 and the third light-emitting layer 213. This allows the first light-emitting layer 211, the second light-emitting layer 212 and the third light-emitting layer 213 to emit light normally and have the expected brightness. When the light-emitting device 20 is applied to the display panel 100, it is beneficial to improve the display effect of the display panel 100.

[0091] In some embodiments, the common electrode layer 22 is an anode, and the material of the particle implantation layer 25 includes P-type doped gallium nitride.

[0092] If the common electrode layer 22 is the anode, then the common electrode layer 22 can generate holes when energized, and the particle injection layer 25 is the hole injection layer.

[0093] The material of the particle injection layer 25 includes P-type doped gallium nitride. P-type doped gallium nitride has a high hole mobility. Therefore, the material of the particle injection layer 25 includes P-type doped gallium nitride, which is beneficial to improve the conductivity of the particle injection layer 25, thereby improving the efficiency of the particle injection layer 25 in injecting holes into the first light-emitting layer 211, the second light-emitting layer 212 and the third light-emitting layer 213.

[0094] like Figure 3 and Figure 6 As shown, in some embodiments, the light-emitting device layer 21 further includes a particle transport layer 215, which is disposed between the semi-pass / semi-resistive layer 214 and the first light-emitting layer 211, between the semi-pass / semi-resistive layer 214 and the second light-emitting layer 212, and on the side of the third light-emitting layer 213 away from the second light-emitting layer 212. The first sub-electrode 231, the second sub-electrode 232, and the third sub-electrode 233 are electrically connected to the particle transport layer 215.

[0095] The particle transport layer 215 allows the first particle and the second particle to pass through, so that the first particle generated by the common electrode layer and the second particle generated by the first electrode can both pass through the particle transport layer 215.

[0096] The first sub-electrode 231, the second sub-electrode 232, and the third sub-electrode 233 are electrically connected to the particle transport layer 215, respectively. Then, the second particles generated by the first sub-electrode 231, the second sub-electrode 232, and the third sub-electrode 233 can migrate to the first light-emitting layer 211, the second light-emitting layer 212, and the third light-emitting layer 213 through the particle transport layer 215.

[0097] In order to reduce the area occupied by the first electrode 23 and increase the light emitting area of the light emitting device 20, the area of the projection of the first electrode 23 on the first light emitting layer 211 is as small as possible. By arranging the particle transport layer 215, in the case that the contact area between the first electrode 23 and the particle transport layer 215 is small, the second particles generated by the first electrode 23 can be rapidly diffused into the particle transport layer 215, and then migrate to the first light emitting layer 211, the second light emitting layer 212 and the third light emitting layer 213 through the corresponding particle transport layer 215.

[0098] The particle transport layer 215 can transport the first particles and the second particles, and thus the first particles generated by the common electrode layer 22 can migrate to the second light emitting layer 212 and the third light emitting layer 213 through the particle transport layer 215.

[0099] By arranging the particle transport layer 215 and arranging the first sub-electrode 231, the second sub-electrode 232 and the third sub-electrode 233 to be conductively connected with the particle transport layer 215, the first sub-electrode 231, the second sub-electrode 232 and the third sub-electrode 233 can transport the second particles to the first light emitting layer 211, the second light emitting layer 212 and the third light emitting layer 213 through the particle transport layer 215, respectively, so that there are enough second particles in the first light emitting layer 211, the second light emitting layer 212 or the third light emitting layer 213, and the first light emitting layer 211, the second light emitting layer 212 and the third light emitting layer 213 can normally emit light independently.

[0100] In some embodiments, the first electrode 23 is a cathode, and the material of the particle transport layer 215 includes n-type gallium nitride.

[0101] When the first electrode 23 is a cathode, the second particles are electrons, and the material of the particle transport layer 215 includes n-type gallium nitride, so that the particle transport layer 215 has a high electron mobility and can allow the holes generated by the common electrode layer 22 to pass normally, thereby facilitating the display reliability of the light emitting device 20.

[0102] As shown in FIG. 1, in some embodiments, the thickness h of the particle transport layer 215 satisfies: 5nm≤h≤50nm. Figure 6

[0103] Optionally, h can be 5nm, 10nm, 15nm, 20nm, 25nm, 30nm, 35nm, 40nm, 45nm or 50nm, etc.

[0104] Optionally, the thickness h of each particle transport layer 215 can satisfy: 5nm≤h≤50nm.

[0105] ​In this way, the thickness of the particle transport layer 215 is thin, the concentration of the n-type doped material in the particle transport layer 215 is low, and the holes generated by the common electrode layer 22 will not be largely recombined in the particle transport layer 215 during the process of passing through the particle transport layer 215, and a sufficient number of holes can pass through the particle transport layer 215 to enter the second light-emitting layer 212 and the third light-emitting layer 213, which is conducive to the normal light emission of the second light-emitting layer 212 and the third light-emitting layer 213, and further conducive to the normal light emission of the light-emitting device 20.

[0106] In some embodiments, the common electrode layer 22 is transparent.

[0107] The common electrode layer 22 is transparent, so that the light emitted by the light-emitting device layer 21 can pass through the common electrode layer 22 and be emitted.

[0108] In this way, the light-emitting device layer 21 can emit light from the side close to the common electrode layer 22, which is conducive to improving the light-emitting area of the light-emitting device 20.

[0109] In some embodiments, the material of the common electrode layer 22 includes tin oxide.

[0110] Tin oxide has good conductivity and high light transmittance, which is conducive to improving the light-emitting efficiency of the light-emitting device 20 under the premise of realizing the light emission of the light-emitting device 20. In addition, the common electrode layer 22 can uniformly inject holes into the light-emitting device layer 21, which reduces the risk of uneven distribution of holes in the light-emitting device layer 21, and is conducive to improving the display effect of the light-emitting device 20.

[0111] In some embodiments, the wavelength of the light emitted by the first light-emitting layer 211 is shorter than the wavelength of the light emitted by the second light-emitting layer 212, and the wavelength of the light emitted by the second light-emitting layer 212 is shorter than the wavelength of the light emitted by the third light-emitting layer 213.

[0112] In this way, in the case that the light-emitting device 20 emits light from the side of the light-emitting device layer 21 towards the common electrode layer 22, the risk of the light emitted by the third light-emitting layer 213 with a shorter wavelength exciting the second light-emitting layer 212 and the first light-emitting layer 211 to emit light by the second light-emitting layer 212 or the third light-emitting layer 213 is reduced, and the risk of the light emitted by the second light-emitting layer 212 with a longer wavelength exciting the first light-emitting layer 211 to emit light is reduced, which is conducive to further reducing the risk of mutual interference of the first light-emitting layer 211, the second light-emitting layer 212 and the third light-emitting layer 213, and improving the light-emitting reliability of the light-emitting device 20.

[0113] In some embodiments, the first light-emitting layer 211, the second light-emitting layer 212 and the third light-emitting layer 213 are respectively used to emit one of red light, blue light and green light.

[0114] Thus, the first light-emitting layer 211, the second light-emitting layer 212, and the third light-emitting layer 213 emit one of red light, blue light, and green light respectively, and the three emit different colors.

[0115] Red, blue, and green light are the three primary colors of light. When mixed in different proportions, they can produce a wide variety of colors. Therefore, this arrangement helps to improve the diversity of light emission from the light-emitting device 20.

[0116] In some embodiments, the first light-emitting layer 211 is used to emit blue light, the second light-emitting layer 212 is used to emit green light, and the third light-emitting layer 213 is used to emit red light.

[0117] It is understandable that the wavelength of red light is longer than that of green light, and the wavelength of green light is longer than that of blue light. With this configuration, when the light-emitting device 20 emits light from the side closest to the common electrode layer 22, the risk of the red light emitted by the third light-emitting layer 213 exciting the second light-emitting layer 212 and the first light-emitting layer 211 to emit light can be reduced, as can the risk of the second light-emitting layer 212 emitting green light exciting the first light-emitting layer 211 to emit light can be reduced. This is beneficial to further reduce the risk of mutual interference between the first light-emitting layer 211, the second light-emitting layer 212, and the third light-emitting layer 213.

[0118] like Figure 7 and Figure 8 As shown, the display panel 100 provided according to the embodiments of this application includes an array substrate 110 and a plurality of light-emitting devices 20 as provided in any of the above embodiments. The plurality of light-emitting devices 20 are spaced apart on the array substrate 110. The array substrate 110 is electrically connected to the first electrode 23 to drive the light-emitting devices 20 to emit light.

[0119] Alternatively, the display panel 100 may be an OLED display panel, or the display panel 100 may be a Micro-LED display panel.

[0120] The array substrate 110 may contain a pixel driving circuit, which may include thin film transistors. Different thin film transistors are electrically connected to the first sub-electrode 231, the second sub-electrode 232 and the third sub-electrode 233 of the first electrode 23 of the light-emitting device 20, respectively, so as to drive the light-emitting device 20 to emit light.

[0121] Since the light emitting device 20 can emit light through any one or more of the first light emitting layer 211, the second light emitting layer 212 and the third light emitting layer 213, the color of the light emitted by the light emitting device 20 can be adjusted by adjusting the proportion of different color light, so as to realize multi-color light emission of a single light emitting device 20. That is, a single light emitting device 20 can realize multi-color light emission without arranging monochromatic sub-pixels in the display panel 100, which is conducive to improving the pixel density of the display panel 100, and by arranging the semi-permeable layer 214 between the first light emitting layer 211 and the second light emitting layer 212 and between the second light emitting layer 212 and the third light emitting layer 213, the risk of mutual interference of the first light emitting layer 211, the second light emitting layer 212 and the third light emitting layer 213 can be reduced, and the risk of display distortion of the display panel 100 can be reduced.

[0122] Optionally, one common electrode layer 22 can be arranged for each light emitting device 20 in the display panel 100. Of course, at least two of the plurality of light emitting devices 20 can share one common electrode layer 22.

[0123] In some embodiments, at least two light emitting devices 20 share one common electrode layer 22.

[0124] In this way, the first particles generated by the same common electrode layer 22 in the conductive state can migrate into the plurality of light emitting devices 20.

[0125] Optionally, all light emitting devices 20 of one display panel 100 can share the same common electrode layer 22. The common electrode layer 22 needs to be electrically connected to the driving components inside the display panel 100. Arranging at least two light emitting devices 20 to share one common electrode layer 22 is conducive to reducing the lines for electrically connecting the common electrode layer 22 to the driving components inside the display panel 100, and thus is conducive to simplifying the line arrangement inside the display panel 100.

[0126] As shown in FIG. 1, the display device 10 provided by the embodiment of the present application includes the display panel 100 provided by any one of the above embodiments. Figure 9

[0127] The display device 10 in the embodiment of the present application includes, but is not limited to, a mobile phone, a personal digital assistant (PDA), a tablet computer, an electronic book, a television, a door access control, a smart fixed telephone, a console and other devices with display functions.

[0128] The display device 10 provided by the embodiment of the present application has the same technical effects as the display panel 100 provided by any one of the above embodiments, and thus will not be described here.

[0129] ​Although the present application has been described with reference to preferred embodiments, various modifications can be made to the application without departing from the scope of the application. In particular, the technical features mentioned in the various embodiments can be combined in any way, provided that there is no structural conflict. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A light emitting device, characterized by, The light-emitting device layer comprises a semi-conductive and semi-resistive layer and first, second and third light-emitting layers which are sequentially stacked, the light-emitting colors of any two adjacent ones of the first, second and third light-emitting layers are different, and the semi-conductive and semi-resistive layer is arranged between the first and second light-emitting layers and between the second and third light-emitting layers; a common electrode layer arranged on a side of the first light-emitting layer away from the second light-emitting layer, the common electrode layer providing first particles to the light-emitting device layer; a first electrode opposite in polarity to the common electrode, the first electrode providing second particles to the light-emitting device layer, the first electrode comprising first, second and third sub-electrodes which are insulated from each other, the first sub-electrode being in conductive connection with the first light-emitting layer, the second sub-electrode being in conductive connection with the second light-emitting layer, and the third sub-electrode being in conductive connection with the third light-emitting layer, the light-emitting device layer comprising first and second through holes, the first through hole penetrating the third and second light-emitting layers, and the second through hole penetrating the third light-emitting layer, the first sub-electrode being arranged in the first through hole and insulated from the third and second light-emitting layers, respectively, and the second sub-electrode being arranged in the second through hole and insulated from the third light-emitting layer; wherein the semi-conductive and semi-resistive layer is configured to allow the first particles to pass through and to block the second particles. The light-emitting device layer further comprises an insulating layer arranged between the first sub-electrode and the inner wall of the first through hole and between the second sub-electrode and the inner wall of the second through hole.

2. The light emitting device of claim 1, wherein, The insulating layer is further arranged on a side of the light-emitting device layer away from the common electrode layer and between any two of the first, second and third sub-electrodes.

3. The light emitting device of claim 2, wherein, The common electrode layer is an anode, and the first electrode is a cathode.

4. The light emitting device of claim 1, wherein, The material of the semi-conductive and semi-resistive layer comprises P-doped aluminum gallium nitride, and / or the material of the semi-conductive and semi-resistive layer comprises undoped gallium nitride.

5. The light emitting device of claim 4, wherein, The light-emitting device further comprises a particle injection layer arranged between the common electrode layer and the first light-emitting layer, the particle injection layer injecting the first particles into the light-emitting device layer.

6. The light emitting device of claim 1, wherein, The common electrode layer is an anode, and the material of the particle injection layer comprises P-doped aluminum gallium nitride.

7. The light emitting device of claim 6, wherein, The light-emitting device layer further comprises a particle transport layer arranged between the semi-conductive and semi-resistive layer and the first light-emitting layer, between the semi-conductive and semi-resistive layer and the second light-emitting layer, and on a side of the third light-emitting layer away from the second light-emitting layer, the first, second and third sub-electrodes being in conductive connection with the particle transport layer, respectively.

8. The light emitting device of claim 1, wherein, The first electrode is a cathode, and the material of the particle transport layer comprises n-type gallium nitride.

9. The light emitting device of claim 8, wherein, The thickness h of the particle transport layer satisfies 5nm≤h≤50nm.

10. The light emitting device of claim 8, wherein, The common electrode layer is transparent.

11. The light emitting device of claim 1, wherein, The material of the common electrode layer comprises tin oxide.

12. The light emitting device of claim 11, wherein, ​ 13. The light-emitting device according to any one of claims 1 to 11, wherein the wavelength of the light emitted by the first light-emitting layer is shorter than the wavelength of the light emitted by the second light-emitting layer, and the wavelength of the light emitted by the second light-emitting layer is shorter than the wavelength of the light emitted by the third light-emitting layer; and / or the first light-emitting layer, the second light-emitting layer, and the third light-emitting layer are respectively configured to emit one of red light, blue light, and green light.

14. The light emitting device of claim 13, wherein, the first light-emitting layer is configured to emit blue light, the second light-emitting layer is configured to emit green light, and the third light-emitting layer is configured to emit red light.

15. A display panel, characterized by comprising: an array substrate; a plurality of light-emitting devices as claimed in any one of claims 1 to 14, arranged at intervals on the array substrate, the array substrate being electrically connected to the first electrode to drive the light-emitting devices to emit light.

16. The display panel of claim 15, wherein, at least two of the light-emitting devices share one of the common electrode layers.

17. A display device comprising: a display panel as claimed in claim 15 or 16.

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