Light-emitting device, preparation method thereof and display device

Abstract

The embodiment of the invention belongs to the technical field of display, and relates to a light-emitting device, a preparation method thereof and a display device. The light-emitting device comprises a first substrate and a second substrate, the first substrate is provided with a first pixel opening, a first electrode opening and a second electrode opening, a first light-emitting unit is arranged in the first pixel opening, a first electric conductor and a second electric conductor are arranged in the first electrode opening and the second electrode opening, and the first light-emitting unit is connected with the first electric conductor and the second electric conductor; a second pixel opening, a third electrode opening and a fourth electrode opening are formed in the second substrate, a second light-emitting unit is arranged in the second pixel opening, a third electric conductor and a fourth electric conductor are arranged in the third electrode opening and the fourth electrode opening, and the second light-emitting unit is connected with the third electric conductor and the fourth electric conductor; the orthographic projection of the second light-emitting unit on the first substrate covers the first light-emitting unit; the first conductor and the second conductor are connected with the third conductor and the fourth conductor respectively, and the first light-emitting unit and the second light-emitting unit are connected in parallel.

Description

Technical Field

[0001] The present application relates to the field of display technology, and more specifically, to a light-emitting device, a preparation method thereof, and a display apparatus. Background Art

[0002] Traditional stacked light-emitting devices connect two light-emitting units in series in the vertical direction of the substrate, thereby achieving the effect of doubling the efficiency and brightness under the same current; currently, this structure is suitable for evaporation preparation process, but not for solution preparation process, because the solvent of the solution method will cause interface mutual dissolution and destroy the lower light-emitting unit in the stack. Therefore, a new structure is urgently needed to make it possible to use the solution method to prepare stacked light-emitting devices and display devices. Summary of the invention

[0003] Based on this, the embodiments of the present application provide a light emitting device, a method for preparing the same, and a display device.

[0004] In order to solve the above technical problems, the embodiment of the present application provides a light emitting device, which adopts the following technical solution:

[0005] A light emitting device comprises a first substrate and a second substrate which are stacked;

[0006] The first substrate is provided with a first pixel opening, a first electrode opening and a second electrode opening, the first pixel opening is provided with a first light-emitting unit, the first electrode opening is provided with a first conductor, the second electrode opening is provided with a second conductor, and the first light-emitting unit is connected to the first conductor and the second conductor;

[0007] The second substrate is provided with a second pixel opening, a third electrode opening and a fourth electrode opening, the second pixel opening is provided with a second light-emitting unit, the third electrode opening is provided with a third conductor, the fourth electrode opening is provided with a fourth conductor, and the second light-emitting unit is connected to the third conductor and the fourth conductor;

[0008] The orthographic projection of the second light emitting unit on the first substrate at least partially covers the first light emitting unit; the first conductor is connected to the third conductor; the second conductor is connected to the fourth conductor, so that the first light emitting unit and the second light emitting unit are connected in parallel.

[0009] Furthermore, the second substrate includes a light-transmitting layer and a second pixel defining layer which are stacked, and the light-transmitting layer is arranged close to the first substrate; the second pixel opening, the third electrode opening and the fourth electrode opening are arranged on the second pixel defining layer;

[0010] The light-transmitting layer is provided with a first through hole and a second through hole penetrating through the upper and lower ends, the first through hole is located at the bottom of the third electrode opening, the second through hole is located at the bottom of the fourth electrode opening, the first through hole is provided with the first conductor and the third conductor, the second through hole is provided with the second conductor and the fourth conductor; and / or

[0011] The material of the light-transmitting layer is polyimide; and / or

[0012] The light transmittance of the light-transmitting layer is 30% to 100%; and / or

[0013] The first substrate includes a circuit layer and a first pixel defining layer which are stacked. The first pixel defining layer is arranged close to the second substrate. The first pixel opening, the first electrode opening and the second electrode opening are arranged on the first pixel defining layer.

[0014] Furthermore, a packaging layer is provided on a side of the second substrate away from the first substrate; and / or

[0015] A side of the second substrate close to the first substrate contacts with a surface of the first substrate.

[0016] Further, the first light-emitting unit includes a first electrode, a first functional layer, and a second electrode stacked in sequence from bottom to top; one end of the first electrode extends into the first electrode opening and is connected to the first conductor; one end of the second electrode extends into the second electrode opening and is connected to the second conductor; and / or

[0017] The second light-emitting unit includes a third electrode, a second functional layer and a fourth electrode stacked in sequence from bottom to top; one end of the third electrode extends into the third electrode opening and is connected to the third conductor; one end of the fourth electrode extends into the fourth electrode opening and is connected to the fourth conductor.

[0018] Further, at least one first electrode opening and at least one second electrode opening are respectively provided on both sides of each first pixel opening; and / or

[0019] At least one third electrode opening and at least one fourth electrode opening are respectively disposed on two sides of each second pixel opening; and / or

[0020] The orthographic projection of the third electrode opening on the first substrate at least partially covers the first electrode opening; and / or

[0021] The orthographic projection of the fourth electrode opening on the first substrate at least partially covers the second electrode opening.

[0022] Furthermore, the first electrode is a reflective electrode; and / or

[0023] The second electrode is a transparent electrode; and / or

[0024] The third electrode is a transparent electrode; and / or

[0025] The fourth electrode is a transparent electrode.

[0026] In order to solve the above technical problems, the present application also provides a method for preparing a light-emitting device, which adopts the following technical solution:

[0027] A method for preparing a light emitting device comprises the following steps:

[0028] A first substrate preform and a second substrate preform are provided; wherein the first substrate preform is provided with a first pixel opening, a first electrode opening, and a second electrode opening, and a first light-emitting unit is provided in the first pixel opening; and the second substrate preform is provided with a second pixel opening, a third electrode opening, and a fourth electrode opening, and a second light-emitting unit is provided in the second pixel opening;

[0029] Disposing a first conductor and a second conductor in the first electrode opening and the second electrode opening respectively, so that the first conductor and the second conductor are connected to the first light-emitting unit;

[0030] Disposing the second substrate preform on the first substrate preform so that the orthographic projection of the second light-emitting unit on the first substrate at least partially covers the first light-emitting unit;

[0031] A third conductor and a fourth conductor are respectively disposed in the third electrode opening and the fourth electrode opening, so that the first conductor is connected to the third conductor and the second conductor is connected to the fourth conductor, so that the first light-emitting unit is connected in parallel with the second light-emitting unit.

[0032] Further, the second substrate preform comprises a first through hole and a second through hole, the first through hole is located at the bottom of the third electrode opening, and the second through hole is located at the bottom of the fourth electrode opening;

[0033] The first conductor, the second conductor, the third conductor and the fourth conductor are liquid conductive materials;

[0034] In the step of respectively arranging a first conductor and a second conductor in the first electrode opening and the second electrode opening, the volume of the first conductor is larger than the volume of the first electrode opening, and the volume of the second conductor is larger than the volume of the second electrode opening;

[0035] In the step of disposing the second substrate preform on the first substrate preform, the first conductor at least partially enters and fills the first through hole, and the second conductor at least partially enters and fills the second through hole.

[0036] Further, the ratio of the volume of the first conductor to the volume of the first electrode opening is (1-1.3):1; and / or the ratio of the volume of the second conductor to the volume of the second electrode opening is (1-1.3):1; and / or

[0037] The ratio of the volume of the third conductor to the volume of the third electrode opening is (0.7-1):1; and / or the ratio of the volume of the fourth conductor to the volume of the fourth electrode opening is (0.7-1):1; and / or

[0038] The liquid conductive material is at least one of liquid gallium metal, liquid gallium indium tin alloy or liquid mercury metal.

[0039] Furthermore, the volume of the liquid conductive material is 10-100 pL; and / or

[0040] The mass ratio of gallium metal, indium metal and tin metal in the liquid gallium-indium-tin alloy is (6-8):(1-3):(0-2).

[0041] Further, the first substrate preform comprises a circuit layer and a first pixel defining layer which are stacked; the first pixel opening, the first electrode opening and the second electrode opening are arranged on the first pixel defining layer; and / or

[0042] The second substrate preform comprises a light-transmitting layer and a second pixel defining layer which are stacked; the second pixel opening, the third electrode opening and the fourth electrode opening are arranged on the second pixel defining layer; and / or

[0043] The first light-emitting unit includes a first electrode, a first functional layer, and a second electrode stacked in sequence from bottom to top; one end of the first electrode extends into the first electrode opening; one end of the second electrode extends into the second electrode opening; and / or

[0044] The second light-emitting unit includes a third electrode, a second functional layer and a fourth electrode stacked in sequence from bottom to top; one end of the third electrode extends into the third electrode opening; one end of the fourth electrode extends into the fourth electrode opening.

[0045] Further, the step of arranging the second substrate preform on the first substrate preform is: arranging the second substrate preform on the surface of the first substrate preform to seal the first electrode opening and the second electrode opening; and / or

[0046] After the step of respectively arranging the third conductor and the fourth conductor in the third electrode opening and the fourth electrode opening, the method further includes: arranging a packaging layer on the surface of the second substrate preform to seal the third electrode opening and the fourth electrode opening.

[0047] In order to solve the above technical problems, the embodiment of the present application further provides a display device, which adopts the following technical solution:

[0048] A display device comprises the light-emitting device as described above, or a light-emitting device prepared by the preparation method as described above.

[0049] Compared with the prior art, the embodiments of the present application have the following main beneficial effects: the first substrate and the second substrate are used to enable the first light-emitting unit and the second light-emitting unit to be independently arranged, thereby preventing the interfaces of the first light-emitting unit and the second light-emitting unit from being mutually dissolved, thereby avoiding the solvent of the solution method from damaging the lower light-emitting unit, thereby meeting the preparation requirements of the light-emitting device. BRIEF DESCRIPTION OF THE DRAWINGS

[0050] In order to more clearly illustrate the scheme of the present application, a brief introduction is given below to the drawings required for use in the description of the embodiments. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0051] Figure 1 is a schematic diagram of an embodiment of a light emitting device of the present application;

[0052] Figure 2 is a schematic diagram of another embodiment of a light emitting device of the present application;

[0053] Figure 3 is a flow chart of an embodiment of a method for preparing a light-emitting device of the present application;

[0054] Figure 4 It is a schematic diagram of the preparation process of a method for preparing a light-emitting device of the present application.

[0055] Reference numerals:

[0056] 1. first substrate; 11. first pixel opening; 12. first electrode opening; 13. second electrode opening; 14. circuit layer; 15. first pixel defining layer;

[0057] 2. second substrate; 21. second pixel opening; 22. third electrode opening; 23. fourth electrode opening; 24. light-transmitting layer; 25. second pixel defining layer; 26. first through hole; 27. second through hole;

[0058] 3. First light-emitting unit; 31. First electrode; 32. First functional layer; 33. Second electrode; 4. First conductor; 5. Second conductor; 6. Second light-emitting unit; 61. Third electrode; 62. Second functional layer; 63. Fourth electrode; 7. Third conductor; 8. Fourth conductor; 9. Encapsulation layer. DETAILED DESCRIPTION

[0059] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by technicians in the technical field of this application; the terms used in the specification of the application herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned drawings are intended to cover non-exclusive inclusions. The terms "first", "second", etc. in the specification and claims of this application or the above-mentioned drawings are used to distinguish different objects, not to describe a specific order.

[0060] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0061] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the accompanying drawings.

[0062] The present application provides a light emitting device, such as Figure 1 and Figure 2As shown, the light-emitting device includes a first substrate 1 and a second substrate 2 which are stacked; a first pixel opening 11, a first electrode opening 12 and a second electrode opening 13 are provided on the first substrate 1, a first light-emitting unit 3 is provided in the first pixel opening, a first conductor 4 is provided in the first electrode opening 12, a second conductor 5 is provided in the second electrode opening 13, and the first light-emitting unit 3 is connected to the first conductor 4 and the second conductor 5; a second pixel opening 21, a third electrode opening 22 and a fourth electrode opening 23 are provided on the second substrate 2, a second light-emitting unit 6 is provided in the second pixel opening, a third conductor 7 is provided in the third electrode opening 22, a fourth conductor 8 is provided in the fourth electrode opening 23, and the second light-emitting unit 6 is connected to the third conductor 7 and the fourth conductor 8; the orthographic projection of the second light-emitting unit 6 on the first substrate 1 at least partially covers the first light-emitting unit 3; the first conductor 4 is connected to the third conductor 7; the second conductor 5 is connected to the fourth conductor 8, so that the first light-emitting unit 3 and the second light-emitting unit 6 are connected in parallel.

[0063] In this embodiment, when preparing the light-emitting device, the first light-emitting unit 3 is firstly arranged in the first pixel opening 11 of the first substrate 1, and the second light-emitting unit 6 is arranged in the second pixel opening 21 of the second substrate 2; then, the first conductor 4 and the second conductor 5 are respectively arranged in the first electrode opening 12 and the second electrode opening 13 of the first substrate 1, so that the two poles of the first light-emitting unit 3 are connected to the first conductor 4 and the second conductor 5 respectively; then, the second substrate 2 is arranged on the first substrate 1, so that the orthographic projection of the second light-emitting unit 6 on the first substrate 1 at least partially covers the first light-emitting unit 3; finally, the third electrode opening 22 and the fourth electrode opening 23 of the second substrate 2 are respectively arranged. A third conductor 7 and a fourth conductor 8 are provided so that the two poles of the second light-emitting unit 6 are connected to the third conductor 7 and the fourth conductor 8 respectively, and the first conductor 4 is connected to the third conductor 7, and the second conductor 5 is connected to the fourth conductor 8; since the two poles of the first light-emitting unit 3 are connected to the first conductor 4 and the third conductor 7, and the two poles of the second light-emitting unit 6 are connected to the third conductor 7 and the fourth conductor 8 respectively, and the first conductor 4 is connected to the third conductor 7, and the second conductor 5 is connected to the fourth conductor 8, the two poles of the first light-emitting unit 3 are electrically connected to the two poles of the second light-emitting unit 6, thereby realizing an electrically parallel structure of the first light-emitting unit 3 and the second light-emitting unit 6.

[0064] In this embodiment, the first substrate 1 and the second substrate 2 are used to independently set the first light-emitting unit 3 and the second light-emitting unit 6, thereby preventing the first light-emitting unit 3 and the second light-emitting unit 6 from dissolving in the interface, thereby avoiding the solvent of the solution method from damaging the lower light-emitting unit, thereby meeting the preparation requirements of the light-emitting device.

[0065] In this embodiment, the light emitting device can be a top-emitting light emitting device or a bottom-emitting light emitting device. Preferably, the top-emitting light emitting device is used. Enlarging the top openings of the first pixel opening 11 and the second pixel opening 21 can easily improve the light emitting efficiency of the top-emitting light emitting device.

[0066] In this embodiment, the number of the first substrate 1 is one, and the number of the second substrates 2 is multiple. When preparing a light-emitting device, different numbers of second substrates 2 can be used according to the number of layers. For example, when preparing a double-layer light-emitting device, one first substrate 1 and one second substrate 2 are used, the first substrate 1 is located at the bottom layer, and the second substrate 2 is arranged on the first substrate 1; when preparing a three-layer light-emitting device, one first substrate 1 and two second substrates 2 are used, the first substrate 1 is located at the bottom layer, one second substrate 2 is arranged on the first substrate 1, and the other second substrate 2 is arranged on the aforementioned second substrate 2... and so on; the present application can be used to realize the preparation of light-emitting devices with different numbers of layers.

[0067] like Figure 1 and Figure 2 As shown, further, at least three first pixel openings 11 are provided on the first substrate 1 , and at least three second pixel openings 21 are provided on the second substrate 2 .

[0068] In this embodiment, the three first pixel openings 11 are used to set the first light-emitting units 3 that emit different colors, for example, a first pixel opening 11 is used to set the first light-emitting unit 3 that emits red light, a first pixel opening 11 is used to set the first light-emitting unit 3 that emits blue light, and a first pixel opening 11 is used to set the first light-emitting unit 3 that emits green light; the three second pixel openings 21 are used to set the second light-emitting units 6 that emit different colors, for example, a second pixel opening 21 is used to set the second light-emitting unit 6 that emits red light, a second pixel opening 21 is used to set the second light-emitting unit 6 that emits blue light, and a second pixel opening 21 is used to set the second light-emitting unit 6 that emits green light;

[0069] And the orthographic projection of the first light-emitting unit 3 that emits red light at least partially covers the second light-emitting unit 6 that emits red light, the orthographic projection of the first light-emitting unit 3 that emits blue light at least partially covers the second light-emitting unit 6 that emits blue light, and the orthographic projection of the first light-emitting unit 3 that emits green light at least partially covers the second light-emitting unit 6 that emits green light; the present application can be used to realize the preparation of mixed-light stacked light-emitting devices.

[0070] Furthermore, the second substrate 2 includes a light-transmitting layer 24 and a second pixel defining layer 25 which are stacked, and the light-transmitting layer 24 is arranged close to the first substrate 1; the second pixel opening 21, the third electrode opening 22 and the fourth electrode opening 23 are arranged on the second pixel defining layer 25; the light-transmitting layer 24 is provided with a first through hole 26 and a second through hole 27 which pass through the upper and lower ends, the first through hole 26 is located at the bottom of the third electrode opening 22, and the second through hole 27 is located at the bottom of the fourth electrode opening 23, the first through hole 26 is provided with the first conductor 4 and the third conductor 7 so as to connect the first conductor 4 and the third conductor 7, and the second through hole 27 is provided with the second conductor 5 and the fourth conductor 8 so as to connect the second conductor 5 and the fourth conductor 8.

[0071] In this embodiment, the light-transmitting layer 24 allows the light emitted by the first light-emitting unit 3 to pass through, thereby ensuring the light transmittance of the first light-emitting unit 3 and improving the light-emitting efficiency of the light-emitting device.

[0072] Furthermore, the material of the light-transmitting layer 24 is polyimide. Polyimide has the characteristics of high temperature resistance and high insulation. The use of polyimide can improve the stability of the light-transmitting layer 24.

[0073] Furthermore, the light transmittance of the light-transmitting layer 24 is 30% to 100%. The light enters from one side of the light-transmitting layer and exits from the other side through the light-transmitting layer. The light intensity before the light enters one side of the light-transmitting layer is defined as l0, and the light intensity after the light exits from the other side of the light-transmitting layer is defined as l t , the light transmittance is l t / l0.

[0074] In some optional implementations of this embodiment, the light transmittance of the light-transmitting layer 24 is any one of 30%, 40%, 50%, 60%, 70%, 80%, 90%, 100%, etc., or a range between any two of them.

[0075] Furthermore, the first substrate 1 includes 10 The circuit layer 14 and the first pixel defining layer 15 are stacked, the first pixel defining layer 15 is arranged close to the second substrate 2 , and the first pixel opening 11 , the first electrode opening 12 and the second electrode opening 13 are arranged on the first pixel defining layer 15 .

[0076] In this embodiment, a TFT circuit is disposed on the circuit layer 14 .

[0077] In this embodiment, the first electrode opening 12 is connected to the third electrode opening 22 through the first through hole 26, and the second electrode opening 13 is connected to the fourth electrode opening 23 through the second through hole 27. Under the capillary action of the first through hole 26 and the second through hole 27, when the first conductor 4 and the second conductor 5 are respectively arranged in the first electrode opening 12 and the second electrode opening 13, a part of the first conductor 4 will be adsorbed into the first through hole 26, and a part of the second conductor 5 will be adsorbed into the second through hole 27; when the third conductor 7 and the fourth conductor 8 are respectively arranged in the third electrode opening 22 and the fourth electrode opening 23, a part of the third conductor 7 will flow into the first through hole 26, so that the first conductor 4 is connected to the third conductor 7, and a part of the fourth conductor 8 will flow into the second through hole 27, so that the second conductor 5 is connected to the fourth conductor 8, so that the two poles of the first light-emitting unit 3 are electrically connected to the two poles of the second light-emitting unit 6, so that the first light-emitting unit 3 and the second light-emitting unit 6 are electrically connected in parallel.

[0078] like Figure 2 As shown, further, a packaging layer 9 is provided on a side of the second substrate 2 away from the first substrate 1 .

[0079] Furthermore, an encapsulation layer 9 is disposed on a side of the second pixel defining layer 25 away from the light-transmitting layer 24 .

[0080] In this embodiment, the encapsulation layer 9 is used to prevent the third conductor 7 from being separated from the third electrode opening 22 and the fourth conductor 8 from being separated from the fourth electrode opening 23, thereby increasing the reliability of the light-emitting device.

[0081] Furthermore, a side of the second substrate 2 close to the first substrate 1 is in contact with a surface of the first substrate 1 .

[0082] Furthermore, the light-transmitting layer 24 contacts the surface of the first pixel defining layer 15 .

[0083] In this embodiment, the packaging of the first electrode opening 12 and the second electrode opening 13 implemented by the second substrate 2 does not require additional packaging structures, which reduces the structure of the light-emitting device, thereby reducing production costs and time.

[0084] like Figure 1 and Figure 2 As shown, further, the first light-emitting unit 3 includes a first electrode 31, a first functional layer 32 and a second electrode 33 stacked in sequence from bottom to top; one end of the first electrode 31 extends into the first electrode opening 12 and is connected to the first conductor 4; one end of the second electrode 33 extends into the second electrode opening 13 and is connected to the second conductor 5.

[0085] Furthermore, the second light-emitting unit 6 includes a third electrode 61, a second functional layer 62 and a fourth electrode 63 which are stacked in sequence from bottom to top; one end of the third electrode 61 extends into the third electrode opening 22 and is connected to the third conductor 7; one end of the fourth electrode 63 extends into the fourth electrode opening 23 and is connected to the fourth conductor 8.

[0086] In this embodiment, the first electrode 31 and the third electrode 61 have the same polarity, and the second electrode 33 and the fourth electrode 63 have the same polarity.

[0087] In this embodiment, the first electrode 31 can be pre-set in the first pixel opening 11 and the first electrode opening 12 of the first substrate 1, and the third electrode 61 can be pre-set in the second pixel opening 21 and the third electrode opening 22 of the second substrate 2, reducing the preparation steps and difficulty of the light-emitting device.

[0088] Specifically, when setting the first light-emitting unit 3, a first functional layer 32 is set in the first pixel opening 11, and then a second electrode 33 is set on the first functional layer 32 and in the second electrode opening 13; when setting the second light-emitting unit 6, a second functional layer 62 is set in the second pixel opening 21, and then a fourth electrode 63 is set on the second functional layer 62 and in the fourth electrode opening 23; so that the first light-emitting unit 3 and the second light-emitting unit 6 both have two corresponding electrodes.

[0089] Furthermore, the first through hole 26 passes through the first electrode 31 .

[0090] In this embodiment, since the first through hole 26 penetrates the third electrode 61, when the third conductor 7 is arranged in the third electrode opening 22, the first electrode 31 can be connected to the third electrode 61; 12 13, and a fourth electrode 63 is set on the second functional layer 62 and in the fourth electrode opening 23, so that when the second conductor 5 and the fourth conductor 8 are respectively set in the second electrode opening 13 and the fourth electrode opening 23, the second electrode 33 can be connected to the fourth electrode 63.

[0091] Furthermore, the first functional layer 32 and the second functional layer 62 include an electronic functional layer, a light emitting layer and a hole functional layer which are sequentially stacked from bottom to top.

[0092] Furthermore, the electronic functional layer includes an electron injection layer and / or an electron transport layer. When the electronic functional layer includes two layers, the electron injection layer and the electron transport layer; the electron transport layer is arranged close to the side of the light-emitting layer, and the electron injection layer is arranged on the side of the electron transport layer away from the light-emitting layer; wherein the material of the electron transport layer is selected from at least one of doped inorganic nanocrystals, undoped inorganic nanocrystals, and organic electron transport materials, and the undoped inorganic nanocrystals are selected from ZnO, TiO2, SnO2, Al2O3, GaO, Ga2O3, ZrO2, Fe2O3, CrO3, WO3, CdO, CuO, MoO2 , ZnS, ZnSe, CdS, InP, GaP, LiF, LiF / Yb, MgP, MgF2, Ga2O3, Cs2CO3, Rb2CO3, RbBr; the doped inorganic nanocrystals include a second non-doped inorganic nanocrystal and a doping element, and the second non-doped inorganic nanocrystals are selected from ZnO, TiO2, SnO2, Al2O3, GaO, Ga2O3, ZrO2, Fe2O3, CrO3, WO3, CdO, CuO, MoO2, ZnS, ZnSe, CdS, InP, GaP, LiF, LiF / Yb, MgP, MgF2, Ga2O3 , Cs2CO3, Rb2CO3, RbBr, the doping element is selected from one or more of Mg, Ca, Li, Ga, Al, Co, Mn; the organic electron transport material is selected from [6,6]-phenyl C71 butyric acid methyl ester, [6,6]-phenyl C61 butyric acid methyl ester, organic fullerene materials, 2-ethyl-1-(4-(10-(2-naphthyl)-9-anthracenyl)phenyl)-1H-benzimidazole, 1,3,5-tris(1-phenyl-1H-benzimidazol-2-yl)benzene (TPBi), 3,3'-[5'-[3-(3-pyridyl)phenyl](TmPyPb), 4,6-bis( 3,5-Bis(3-pyridylphenyl)-2-methylpyrimidine (B3PYMPM), phenylpyridinium beryllium (Bepp2), 1,3,5-tris(1-phenyl-1H-benzimidazol-2-yl)benzene (TPBi), 3-(biphenyl-4-yl)-5-(4-tert-butylphenyl)-4-phenyl-4H-1,2,4-triazole (TAZ), 1,3,5-tris[(3-pyridyl)-3-phenyl]benzene (TmPyPb), tris-(8-hydroxyquinoline)aluminum (Alq3), 2,9-dimethyl-4,7-biphenyl-1,10-phenanthroline (BCP), 4,7-diphenyl-1,10-phenanthroline (Bphen);

[0093] The material of the electron injection layer is selected from at least one of LiF, Yb, LiF / Yb, MgP, MgF2, Al2O3, Ga2O3, ZnO, Cs2CO3, Rb2CO3, and RbBr.

[0094] Further, the hole functional layer includes a hole injection layer and / or a hole transport layer. When the hole functional layer includes two layers, the hole injection layer and the hole transport layer; the hole transport layer is arranged close to the side of the light-emitting layer, and the hole injection layer is arranged on the side of the hole transport layer away from the light-emitting layer; wherein the material of the hole transport layer is selected from poly (9,9-dioctylfluorene-CO-N-(4-butylphenyl) diphenylamine), polyethylene carbazole, poly (N,N'-bis (4-butylphenyl) -N,N'-bis (phenyl) benzidine), poly (9,9-dioctylfluorene-co-bis-N,N-phenyl-1,4-phenylenediamine), 4,4',4"-tri ( One or more of carbazole-9-yl) triphenylamine, 4,4'-bis(9-carbazole) biphenyl, N,N'-diphenyl-N,N'-bis(3-methylphenyl)-1,1'-biphenyl-4,4'-diamine, N,N'-diphenyl-N,N'-(1-naphthyl)-1,1'-biphenyl-4,4'-diamine, poly(3,4-ethylenedioxythiophene)-poly(styrenesulfonic acid), Spiro-NPB, Spiro-TPD, doped or undoped NiO, MoO3, WO3, V2O5, P-type gallium nitride, CrO3, CuO, MoS2, MoSe2, WS3, WSe3, CuS, CuSCN;

[0095] The material of the hole injection layer is selected from one or more of poly(3,4-ethylenedioxythiophene)-polystyrene sulfonic acid, 2,3,5,6-tetrafluoro-7,7',8,8'-tetracyanoquinone-dimethane, 2,3,6,7,10,11-hexacyano-1,4,5,8,9,12-hexaazatriphenylene, copper phthalocyanine, transition metal oxides, and transition metal sulfur compounds; wherein the transition metal oxides include one or more of NiO, MoO2, WO3, and CuO; the metal sulfur compounds include one or more of MoS2, MoSe2, WS3, WSe3, and CuS.

[0096] Furthermore, the light-emitting layer is a quantum dot light-emitting layer or an organic light-emitting layer, and the material of the quantum dot light-emitting layer includes at least one of single-structure quantum dots and core-shell structure quantum dots;

[0097] The material of the single structure quantum dot is selected from at least one of II-VI group compounds, IV-VI group compounds, III-V group compounds and I-III-VI group compounds, wherein the II-VI group compound is selected from CdS, CdSe, CdTe, ZnS, ZnSe, ZnTe, ZnO, HgS, HgSe, HgTe, CdSeS, CdSeTe, CdSTe, ZnSeS, ZnSeTe, ZnSTe, HgSeS, HgSeTe, HgSTe, CdZnS, CdZnS e, CdZnTe, CdHgS, CdHgSe, CdHgTe, HgZnS, HgZnSe, HgZnTe, CdZnSeS, CdZnSeTe, CdZnSTe, CdHgSeS, CdHgSeTe, CdHgSTe, HgZnSeS, HgZnSeTe and HgZnSTe, and the IV-VI group compound is selected from SnS, SnSe, SnTe, PbS, PbSe, PbTe, SnSeS, SnSeTe, SnSTe, PbSe At least one of SnPbS, SnPbSe, SnPbTe, SnPbSSe, SnPbSeTe and SnPbSTe, wherein the III-V compound is selected from GaN, GaP, GaAs, GaSb, AlN, AlP, AlAs, AlSb, InN, InP, InAs, InSb, GaNP, GaNAs, GaNSb, GaPAs, GaPSb, AlNP, AlNAs, AlNSb, AlPAs, AlPSb, In At least one of GaNP, InNAs, InNSb, InPAs, InPSb, GaAlNP, GaAlNAs, GaAlNSb, GaAlPAs, GaAlPSb, GaInNP, GaInNAs, GaInNSb, GaInPAs, GaInPSb, InAlNP, InAlNAs, InAlNSb, InAlPAs or InAlPSb, and the I-III-VI group compound is selected from at least one of CuInS2, CuInSe2 and AgInS2;

[0098] And / or, the core of the core-shell structure quantum dot includes any one of the above-mentioned single structure quantum dots, and the shell material of the core-shell structure quantum dot includes at least one of CdS, CdTe, CdSeTe, CdZnSe, CdZnS, CdSeS, ZnSe, ZnSeS, ZnS and the above-mentioned single structure quantum dots;

[0099] And / or, the material of the organic light emitting layer includes 4,4'-bis(N-carbazole)-1,1'-biphenyl:triphenyl

[0100] [2-(p-Tolyl)pyridine-C2,N)iridium(III), 4,4',4"-tri(carbazole-9-yl)triphenylamine: tri[2-(p-tolyl)pyridine-C2,N)iridium, diaromatic anthracene derivatives, distilbene aromatic derivatives, pyrene derivatives, fluorene derivatives, TBPe fluorescent materials, TTPX fluorescent materials, TBRb fluorescent materials and DBP fluorescent materials, polyacetylene and its derivatives, polyparaphenylene and its derivatives, polythiophene and its derivatives, polyfluorene and its derivatives, at least one of them.

[0101] like Figure 1 and Figure 2 As shown, further, at least one first electrode opening 12 and at least one second electrode opening 13 are respectively provided on both sides of each first pixel opening 11. A first light-emitting unit 3 is provided in each first pixel opening 11, and a first electrode opening 12 and a second electrode opening 13 are respectively provided on both sides of each first pixel opening 11 to meet the connection requirements of the first light-emitting unit 3.

[0102] Furthermore, at least one third electrode opening 22 and at least one fourth electrode opening 23 are respectively provided on both sides of each second pixel opening 21. A second light-emitting unit 6 is provided in each second pixel opening 21, and a third electrode opening 22 and a fourth electrode opening 23 are respectively provided on both sides of each second pixel opening 21 to meet the connection requirements of the second light-emitting unit 6.

[0103] Furthermore, the orthographic projection of the third electrode opening 22 on the first substrate 1 at least partially covers the first electrode opening 12, so as to ensure that the first conductor 4 in the first electrode opening 12 is connected with the third conductor 7 in the third electrode opening 22, so that the first light-emitting unit 3 and the second light-emitting unit 6 are connected in parallel.

[0104] Furthermore, the orthographic projection of the fourth electrode opening 23 on the first substrate 1 at least partially covers the second electrode opening 13, so as to ensure that the second conductor 5 in the second electrode opening 13 is connected with the fourth conductor 8 in the fourth electrode opening 23, so that the first light-emitting unit 3 and the second light-emitting unit 6 are connected in parallel.

[0105] Furthermore, the first electrode 31 is a reflective electrode.

[0106] Furthermore, the second electrode 33 is a transparent electrode.

[0107] Furthermore, the third electrode 61 is a transparent electrode.

[0108] Furthermore, the fourth electrode 63 is a transparent electrode.

[0109] In this embodiment, the second electrode 33, the third electrode 61 and the fourth electrode 63 are transparent electrodes, so that the present application can be used in a top-emitting light-emitting device. The transparent electrode can be a conventional transparent electrode with high light transmittance (eg, above 80%), which is not limited in this embodiment.

[0110] Furthermore, the first electrode 31 and the third electrode 61 are anodes, and the second electrode 33 and the fourth electrode 63 are cathodes.

[0111] In this embodiment, the anode of the first light emitting unit 3 is electrically connected to the anode of the second light emitting unit 6, and the cathode of the first light emitting unit 3 is electrically connected to the cathode of the second light emitting unit 6, so that the first light emitting unit 3 and the second light emitting unit 6 are electrically connected in parallel.

[0112] The materials of the anode and the cathode independently include at least one of a metal material, a carbon material and a metal oxide, the metal material includes at least one of Al, Ag, Cu, Mo, Au, Ba, Ca, Yb and Mg; the carbon material includes at least one of graphite, carbon nanotubes, graphene and carbon fiber; the metal oxide includes a doped or undoped metal oxide, the doped metal oxide includes at least one of ITO, FTO, ATO, AZO, GZO, IZO, MZO and AMO, or includes a composite electrode in which a metal is sandwiched between doped or undoped transparent metal oxides, and the composite electrode includes at least one of AZO / Ag / AZO, AZO / Al / AZO, ITO / Ag / ITO, ITO / Al / ITO, ZnO / Ag / ZnO, ZnO / Al / ZnO, ZnS / Ag / ZnS, ZnS / Al / ZnS, TiO2 / Ag / TiO2 and TiO2 / Al / TiO2.

[0113] The present application also provides a method for preparing a light emitting device, such as Figure 3 and Figure 4 As shown, the preparation method comprises the following steps:

[0114] S10, providing a first substrate preform and a second substrate preform; wherein the first substrate preform is provided with a first pixel opening, a first electrode opening, and a second electrode opening, and a first light-emitting unit is provided in the first pixel opening; and the second substrate preform is provided with a second pixel opening, a third electrode opening, and a fourth electrode opening, and a second light-emitting unit is provided in the second pixel opening;

[0115] S20, respectively arranging a first conductor and a second conductor in the first electrode opening and the second electrode opening, so that the first conductor and the second conductor are connected to the first light-emitting unit;

[0116] S30, disposing the second substrate preform on the first substrate preform so that the orthographic projection of the second light-emitting unit on the first substrate at least partially covers the first light-emitting unit;

[0117] S40, respectively setting a third conductor and a fourth conductor in the third electrode opening and the fourth electrode opening, connecting the first conductor to the third conductor and connecting the second conductor to the fourth conductor, so that the first light-emitting unit and the second light-emitting unit are connected in parallel.

[0118] In this embodiment, a first substrate preform and a second substrate preform are first provided, wherein the first substrate preform is provided with a first pixel opening, a first electrode opening, and a second electrode opening, and a first light-emitting unit is provided in the first pixel opening, and the second substrate preform is provided with a second pixel opening, a third electrode opening, and a fourth electrode opening, and a second light-emitting unit is provided in the second pixel opening; then, a first conductor is provided in the first electrode opening, and a second conductor is provided in the second electrode opening, so that two poles of the first light-emitting unit are connected to the first conductor and the second conductor respectively; then, the second substrate preform is provided on the first substrate preform, so that the orthographic projection of the second light-emitting unit on the first substrate at least partially covers the first light-emitting unit; finally, a third conductor is provided in the third electrode opening, and a fourth conductor is provided in the fourth electrode opening, so that two poles of the second light-emitting unit are connected to the third conductor and the fourth conductor respectively, and the first conductor is connected to the third conductor, and the second conductor is connected to the fourth conductor, so that two poles of the first light-emitting unit are electrically connected to two poles of the second light-emitting unit, thereby realizing an electrically parallel structure of the first light-emitting unit and the second light-emitting unit.

[0119] In this embodiment, the first substrate preform and the second substrate preform are used to independently set the first light-emitting unit and the second light-emitting unit, thereby preventing the first light-emitting unit and the second light-emitting unit from dissolving in the interface, thereby avoiding the solvent of the solution method from damaging the lower light-emitting unit, thereby meeting the preparation requirements of the light-emitting device.

[0120] In this embodiment, the light emitting device may be a top-emitting light emitting device or a bottom-emitting light emitting device, preferably a top-emitting light emitting device, and enlarging the top openings of the first pixel opening and the second pixel opening can easily improve the light emitting efficiency of the top-emitting light emitting device.

[0121] In this embodiment, the number of the first substrate preforms is one, and the number of the second substrate preforms is multiple. When preparing a light-emitting device, different numbers of second substrate preforms can be used according to the number of layers. For example, when preparing a double-layer light-emitting device, one first substrate preform and one second substrate preform are used, the first substrate preform is located at the bottom layer, and the second substrate preform is arranged on the first substrate preform; when preparing a three-layer light-emitting device, one first substrate preform and two second substrate preforms are used, the first substrate preform is located at the bottom layer, one second substrate preform is arranged on the first substrate preform, and the other second substrate preform is arranged on the aforementioned second substrate preform... and so on; the present application can be used to realize the preparation of light-emitting devices with different numbers of layers.

[0122] Further, the second substrate preform comprises a first through hole and a second through hole, the first through hole is located at the bottom of the third electrode opening, and the second through hole is located at the bottom of the fourth electrode opening;

[0123] The first conductor, the second conductor, the third conductor and the fourth conductor are liquid conductive materials;

[0124] In the step S20, in respectively arranging a first conductor and a second conductor in the first electrode opening and the second electrode opening, the volume of the first conductor is set to be larger than the volume of the first electrode opening, and the volume of the second conductor is set to be larger than the volume of the second electrode opening;

[0125] In the step S30, the second substrate preform is disposed on the first substrate preform, the first conductor at least partially enters and fills the first through hole, and the second conductor at least partially enters and fills the second through hole.

[0126] In this embodiment, the first electrode opening is connected to the third electrode opening through the first through hole, and the second electrode opening is connected to the fourth electrode opening through the second through hole. When the first conductor and the second conductor are respectively arranged in the first electrode opening and the second electrode opening, the volume of the first conductor is set to be larger than the volume of the first electrode opening, and the volume of the second conductor is set to be larger than the volume of the second electrode opening; so that under the capillary action of the first through hole and the second through hole, a part of the first conductor is adsorbed into the first through hole, and a part of the second conductor is adsorbed into the second through hole; when the third conductor and the fourth conductor are respectively arranged in the third electrode opening and the fourth electrode opening, a part of the third conductor flows into the first through hole, so that the first conductor is connected to the third conductor, and a part of the fourth conductor flows into the second through hole, so that the second conductor is connected to the fourth conductor, so that the two poles of the first light-emitting unit are electrically connected to the two poles of the second light-emitting unit, so that the first light-emitting unit and the second light-emitting unit are electrically connected in parallel.

[0127] Further, the ratio of the volume of the first conductor to the volume of the first electrode opening is (1-1.3):1; and / or the ratio of the volume of the second conductor to the volume of the second electrode opening is (1-1.3):1. This ensures that the first conductor can be connected to the third conductor through the first through hole, and the second conductor can be connected to the fourth conductor through the second through hole.

[0128] Furthermore, the ratio of the volume of the third conductor to the volume of the third electrode opening is (0.7-1):1; and / or the ratio of the volume of the fourth conductor to the volume of the fourth electrode opening is (0.7-1):1. When preparing a double-layer light-emitting device, since there is no further stacking on the second substrate preform, the third conductor and the fourth conductor do not need to exceed the solvent of the third electrode opening and the fourth electrode opening, and the third conductor and the fourth conductor can be prevented from overflowing the third electrode opening and the fourth electrode opening.

[0129] Furthermore, when preparing a three-layer light-emitting device, a first substrate preform and a plurality of second substrate preforms are used, the first substrate preform is located at the bottom layer, one second substrate preform is arranged on the first substrate preform, another second substrate preform is arranged on the aforementioned second substrate preform... and so on; the present application can be used to realize the preparation of light-emitting devices with different numbers of layers. When preparing a light-emitting device with three or more layers, on the topmost second substrate preform (i.e., the second substrate preform farthest from the first substrate preform), the ratio of the volume of the third conductor to the volume of the third electrode opening is (0.7-1):1, and the ratio of the volume of the fourth conductor to the volume of the fourth electrode opening is (0.7-1):1; on the remaining second substrate preforms located between the first substrate preform and the topmost second substrate preform, the ratio of the volume of the third conductor to the volume of the third electrode opening is (1-1.3):1, and the ratio of the volume of the fourth conductor to the volume of the fourth electrode opening is (1-1.3):1.

[0130] Furthermore, the liquid conductive material is at least one of liquid gallium metal, liquid gallium indium tin alloy or liquid mercury metal.

[0131] In this embodiment, gallium metal, gallium indium tin alloy and mercury metal have the characteristics of low melting points and remain liquid at room temperature. There is no need to perform specific treatment on the liquid conductive material to meet the preparation requirements, thereby reducing the difficulty of preparation.

[0132] Specifically, the melting point of gallium metal is 29.76° C.; the melting point of mercury metal is −38.86° C.; the melting point of gallium indium tin alloy decreases with increasing indium content and increases with increasing tin content. In the present application, the liquid gallium indium tin alloy should remain liquid at room temperature.

[0133] Preferably, the liquid conductive material is liquid gallium metal or liquid gallium-indium-tin alloy; liquid gallium metal and liquid gallium-indium-tin alloy are non-toxic and can improve the safety of preparing light-emitting devices.

[0134] Furthermore, the mass ratio of gallium metal, indium metal and tin metal in the liquid gallium-indium-tin alloy is (6-8):(1-3):(0-2).

[0135] Preferably, the mass ratio of gallium, indium and tin in the liquid gallium-indium-tin alloy is 75.5:24.5:0 or 68.5:21.5:10.

[0136] In this embodiment, when the mass ratio of gallium, indium, and tin in the liquid gallium indium tin alloy is 75.5:24.5:0, the melting point is 15.7°C; when the mass ratio of gallium, indium, and tin in the liquid gallium indium tin alloy is 68.5:21.5:10, the melting point is -19°C; the above liquid gallium indium tin alloy remains liquid at room temperature, and the preparation requirements can be met without the need for specific treatment of the liquid gallium indium tin alloy, thereby reducing the difficulty of preparation. Moreover, the above mass ratio of gallium, indium, and tin in the liquid gallium indium tin alloy can easily obtain the corresponding conductor, thereby reducing the difficulty of preparation.

[0137] Furthermore, the volume of the liquid conductive material is 10-100 pL.

[0138] In some optional implementations of this embodiment, the volume of the liquid conductive material is any one of 10pL, 20pL, 30pL, 40pL, 50pL, 60pL, 70pL, 80pL, 90pL, 100pL, etc., or a range between any two of them.

[0139] like Figure 3 and Figure 4 As shown, further, the first substrate preform includes a circuit layer and a first pixel defining layer which are stacked; the first pixel opening, the first electrode opening and the second electrode opening are arranged on the first pixel defining layer.

[0140] In this embodiment, a TFT circuit is provided on the circuit layer.

[0141] Furthermore, the second substrate preform includes a light-transmitting layer and a second pixel defining layer which are stacked; the second pixel opening, the third electrode opening and the fourth electrode opening are arranged on the second pixel defining layer.

[0142] In this embodiment, the light-transmitting layer allows the light emitted by the first light-emitting unit to pass through, thereby ensuring the light transmittance of the first light-emitting unit, so as to improve the light-emitting efficiency of the light-emitting device.

[0143] Furthermore, the first light-emitting unit includes a first electrode, a first functional layer, and a second electrode stacked in sequence from bottom to top; one end of the first electrode extends into the first electrode opening; and one end of the second electrode extends into the second electrode opening.

[0144] Furthermore, the second light-emitting unit includes a third electrode, a second functional layer and a fourth electrode stacked in sequence from bottom to top; one end of the third electrode extends into the third electrode opening; one end of the fourth electrode extends into the fourth electrode opening.

[0145] Furthermore, the second substrate preform further comprises a base, and the light-transmitting layer is disposed on the base;

[0146] Before the step S30 of placing the second substrate preform on the first substrate preform, the method further includes: peeling off the base.

[0147] Furthermore, the step S30 of disposing the second substrate preform on the first substrate preform specifically includes: disposing the light-transmitting layer on the first pixel defining layer.

[0148] In this embodiment, the substrate and the support layer are separated by laser lift-off (LLO) technology.

[0149] In this embodiment, before the second substrate preform is disposed on the first substrate preform, the base and the light-transmitting layer are separated by laser lift-off (LLO) technology, and then the light-transmitting layer is disposed on the first substrate preform; the first electrode opening is connected to the third electrode opening through the first through hole, and the second electrode opening is connected to the fourth electrode opening through the second through hole, and under the capillary action of the first through hole and the second through hole, when the first conductor and the second conductor are respectively disposed in the first electrode opening and the second electrode opening, a part of the first conductor is adsorbed into the first through hole, and a part of the second conductor is adsorbed into the second through hole; when the third conductor and the fourth conductor are respectively disposed in the third electrode opening and the fourth electrode opening, a part of the third conductor flows into the first through hole, so that the first conductor is connected to the third conductor, and a part of the fourth conductor flows into the second through hole, so that the second conductor is connected to the fourth conductor, so that the two poles of the first light-emitting unit are electrically connected to the two poles of the second light-emitting unit, so that the first light-emitting unit and the second light-emitting unit are electrically connected in parallel.

[0150] In this embodiment, peeling off the base can expose the bottoms of the first through hole and the second through hole, and can also reduce the weight that the first substrate preform needs to bear, thereby avoiding damage to the first substrate preform and improving the reliability of the light-emitting device.

[0151] Further, the step S10, providing a first substrate preform and a second substrate preform; wherein the first substrate preform is provided with a first pixel opening, a first electrode opening, and a second electrode opening, and a first light-emitting unit is provided in the first pixel opening; and the second substrate preform is provided with a second pixel opening, a third electrode opening, and a fourth electrode opening, and a second light-emitting unit is provided in the second pixel opening, specifically comprises:

[0152] Obtain a first substrate preform and a second substrate preform;

[0153] Disposing a first electrode in the first electrode opening and the first pixel opening, and disposing a third electrode in the third electrode opening and the second pixel opening;

[0154] Disposing a first functional layer on the first electrode of the first pixel opening, and disposing a second functional layer on the third electrode of the second pixel opening;

[0155] A second electrode is disposed on the first functional layer and in the second electrode opening, and a fourth electrode is disposed on the second functional layer and in the fourth electrode opening.

[0156] In this embodiment, the first light-emitting unit and the second light-emitting unit may be provided simultaneously; or the first light-emitting unit may be prepared first and then the second light-emitting unit may be prepared, which is not limited here.

[0157] like Figure 3 and Figure 4 As shown, further, the step S30, the step of disposing the second substrate preform on the first substrate preform is: disposing the second substrate preform on the surface of the first substrate preform to seal the first electrode opening and the second electrode opening.

[0158] In this embodiment, the second substrate preform is used to achieve the encapsulation of the first electrode opening and the second electrode opening, without the need to provide an additional encapsulation structure, thereby reducing the structure of the light-emitting device and reducing production cost and time.

[0159] Further, after the step S40, respectively arranging the third conductor and the fourth conductor in the third electrode opening and the fourth electrode opening, the step further includes: step S50, arranging a packaging layer on the surface of the second substrate preform to seal the third electrode opening and the fourth electrode opening.

[0160] In this embodiment, the third conductor can be prevented from being separated from the third electrode opening and the fourth conductor can be prevented from being separated from the fourth electrode opening, thereby increasing the reliability of the light-emitting device.

[0161] Specifically, the encapsulation layer is a glass cover plate.

[0162] An embodiment of the present application further provides a display device, which includes the light-emitting device as described above, or a light-emitting device prepared by the preparation method as described above.

[0163] In this embodiment, the first light-emitting unit and the second light-emitting unit are independently arranged to prevent the interfaces of the first light-emitting unit and the second light-emitting unit from being mutually dissolved, thereby avoiding the solvent of the solution method from damaging the lower light-emitting unit, thereby meeting the preparation requirements of the light-emitting device.

[0164] Obviously, the embodiments described above are only some embodiments of the present application, rather than all embodiments. The preferred embodiments of the present application are given in the accompanying drawings, but they do not limit the patent scope of the present application. The present application can be implemented in many different forms. On the contrary, the purpose of providing these embodiments is to make the understanding of the disclosure of the present application more thorough and comprehensive. Although the present application is described in detail with reference to the aforementioned embodiments, for those skilled in the art, it is still possible to modify the technical solutions recorded in the aforementioned specific implementation methods, or to perform equivalent replacement of some of the technical features therein. Any equivalent structure made using the contents of the specification and drawings of this application, directly or indirectly used in other related technical fields, is similarly within the scope of patent protection of this application.

Claims

1. A light emitting device, characterized in that: It includes a first substrate and a second substrate which are stacked; The first substrate is provided with a first pixel opening, a first electrode opening and a second electrode opening, the first pixel opening is provided with a first light-emitting unit, the first electrode opening is provided with a first conductor, the second electrode opening is provided with a second conductor, and the first light-emitting unit is connected to the first conductor and the second conductor; The second substrate is provided with a second pixel opening, a third electrode opening and a fourth electrode opening, the second pixel opening is provided with a second light-emitting unit, the third electrode opening is provided with a third conductor, the fourth electrode opening is provided with a fourth conductor, and the second light-emitting unit is connected to the third conductor and the fourth conductor; The orthographic projection of the second light emitting unit on the first substrate at least partially covers the first light emitting unit; the first conductor is connected to the third conductor; the second conductor is connected to the fourth conductor, so that the first light emitting unit and the second light emitting unit are connected in parallel.

2. The light emitting device according to claim 1, characterized in that: The second substrate comprises a light-transmitting layer and a second pixel defining layer which are stacked, and the light-transmitting layer is arranged close to the first substrate; the second pixel opening, the third electrode opening and the fourth electrode opening are arranged on the second pixel defining layer; The light-transmitting layer is provided with a first through hole and a second through hole penetrating through the upper and lower ends, the first through hole is located at the bottom of the third electrode opening, the second through hole is located at the bottom of the fourth electrode opening, the first through hole is provided with the first conductor and the third conductor, the second through hole is provided with the second conductor and the fourth conductor; and / or The material of the light-transmitting layer is polyimide; and / or The light transmittance of the light-transmitting layer is 30% to 100%; and / or The first substrate includes a circuit layer and a first pixel defining layer which are stacked. The first pixel defining layer is arranged close to the second substrate. The first pixel opening, the first electrode opening and the second electrode opening are arranged on the first pixel defining layer.

3. The light emitting device according to claim 1, characterized in that: A packaging layer is provided on a side of the second substrate away from the first substrate; and / or A side of the second substrate close to the first substrate contacts with a surface of the first substrate.

4. The light emitting device according to claim 1, characterized in that: The first light-emitting unit includes a first electrode, a first functional layer, and a second electrode stacked in sequence from bottom to top; one end of the first electrode extends into the first electrode opening and is connected to the first conductor; one end of the second electrode extends into the second electrode opening and is connected to the second conductor; and / or The second light-emitting unit includes a third electrode, a second functional layer and a fourth electrode stacked in sequence from bottom to top; one end of the third electrode extends into the third electrode opening and is connected to the third conductor; one end of the fourth electrode extends into the fourth electrode opening and is connected to the fourth conductor.

5. The light emitting device according to claim 1, characterized in that: At least one first electrode opening and at least one second electrode opening are respectively provided on both sides of each first pixel opening; and / or At least one third electrode opening and at least one fourth electrode opening are respectively disposed on two sides of each second pixel opening; and / or The orthographic projection of the third electrode opening on the first substrate at least partially covers the first electrode opening; and / or The orthographic projection of the fourth electrode opening on the first substrate at least partially covers the second electrode opening.

6. The light emitting device according to claim 4, characterized in that: The first electrode is a reflective electrode; and / or The second electrode is a transparent electrode; and / or The third electrode is a transparent electrode; and / or The fourth electrode is a transparent electrode.

7. A method for preparing a light emitting device, characterized in that: The following steps are involved: A first substrate preform and a second substrate preform are provided; wherein the first substrate preform is provided with a first pixel opening, a first electrode opening, and a second electrode opening, and a first light-emitting unit is provided in the first pixel opening; and the second substrate preform is provided with a second pixel opening, a third electrode opening, and a fourth electrode opening, and a second light-emitting unit is provided in the second pixel opening; Disposing a first conductor and a second conductor in the first electrode opening and the second electrode opening respectively, so that the first conductor and the second conductor are connected to the first light-emitting unit; Disposing the second substrate preform on the first substrate preform so that the orthographic projection of the second light-emitting unit on the first substrate at least partially covers the first light-emitting unit; A third conductor and a fourth conductor are respectively disposed in the third electrode opening and the fourth electrode opening, so that the first conductor is connected to the third conductor and the second conductor is connected to the fourth conductor, so that the first light-emitting unit is connected in parallel with the second light-emitting unit.

8. The method for preparing a light emitting device according to claim 7, characterized in that: The second substrate preform comprises a first through hole and a second through hole, the first through hole is located at the bottom of the third electrode opening, and the second through hole is located at the bottom of the fourth electrode opening; The first conductor, the second conductor, the third conductor and the fourth conductor are liquid conductive materials; In the step of respectively arranging a first conductor and a second conductor in the first electrode opening and the second electrode opening, the volume of the first conductor is larger than the volume of the first electrode opening, and the volume of the second conductor is larger than the volume of the second electrode opening; In the step of disposing the second substrate preform on the first substrate preform, the first conductor at least partially enters and fills the first through hole, and the second conductor at least partially enters and fills the second through hole.

9. The method for preparing a light emitting device according to claim 8, characterized in that: The ratio of the volume of the first conductor to the volume of the first electrode opening is (1-1.3):1; and / or the ratio of the volume of the second conductor to the volume of the second electrode opening is (1-1.3):1; and / or The ratio of the volume of the third conductor to the volume of the third electrode opening is (0.7-1):1; and / or the ratio of the volume of the fourth conductor to the volume of the fourth electrode opening is (0.7-1):1; and / or The liquid conductive material is at least one of liquid gallium metal, liquid gallium indium tin alloy or liquid mercury metal.

10. The method for preparing a light emitting device according to claim 9, characterized in that: The volume of the liquid conductive material is 10-100 pL; and / or The mass ratio of gallium metal, indium metal and tin metal in the liquid gallium-indium-tin alloy is (6-8):(1-3):(0-2).

11. The method for preparing a light emitting device according to any one of claims 7 to 10, characterized in that: The first substrate preform comprises a circuit layer and a first pixel defining layer which are stacked; the first pixel opening, the first electrode opening and the second electrode opening are arranged on the first pixel defining layer; and / or The second substrate preform comprises a light-transmitting layer and a second pixel-defining layer which are stacked; The second pixel opening, the third electrode opening and the fourth electrode opening are disposed on the second pixel defining layer; and / or The first light-emitting unit includes a first electrode, a first functional layer, and a second electrode stacked in sequence from bottom to top; one end of the first electrode extends into the first electrode opening; one end of the second electrode extends into the second electrode opening; and / or The second light-emitting unit includes a third electrode, a second functional layer and a fourth electrode stacked in sequence from bottom to top; one end of the third electrode extends into the third electrode opening; one end of the fourth electrode extends into the fourth electrode opening.

12. The method for preparing a light emitting device according to any one of claims 7 to 10, characterized in that: The step of arranging the second substrate preform on the first substrate preform is: arranging the second substrate preform on the surface of the first substrate preform to seal the first electrode opening and the second electrode opening; and / or After the step of respectively arranging the third conductor and the fourth conductor in the third electrode opening and the fourth electrode opening, the method further includes: arranging a packaging layer on the surface of the second substrate preform to seal the third electrode opening and the fourth electrode opening.

13. A display device, characterized in that: The invention comprises a light-emitting device as claimed in any one of claims 1 to 6, or a light-emitting device prepared by the preparation method as claimed in any one of claims 7 to 12.

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