CN100508187C - A luminescent device and preparation method thereof - Google Patents

Abstract

The present invention relates to a light-emitting device, comprising: a first organic light-emitting device, the first organic light-emitting device has a substrate and a light-emitting element including first and second electrodes formed on the substrate, wherein the substrate is in contact with the substrate At least one of the adjacent first electrodes has a light reflection function, and the second electrode away from the substrate is a transparent electrode; and at least one second organic light-emitting device superimposed on the light-emitting side of the first organic light-emitting device, the second organic light-emitting device The device has a transparent substrate and a light-emitting element in which the first and second electrodes formed on the transparent substrate are both transparent electrodes, and the light-emitting element of the at least one second organic light-emitting device is close to the light-emitting side of the first organic light-emitting device, and Overlaid with the light-emitting element of the first organic light-emitting device, the substrate of the first organic light-emitting device is used as the packaging sheet of the second organic light-emitting device, and the substrate of the second organic light-emitting device is used as the packaging sheet of the first organic light-emitting device.

Description

A light-emitting device and its preparation method

technical field

The invention relates to a light-emitting device, in particular to a light-emitting device with a laminated structure using an organic electroluminescent element and a preparation method thereof.

Background technique

A general organic electroluminescent display is a self-luminous display device that emits light by electrically exciting an organic compound. When positive and negative voltages are applied to the electrodes, holes move from the electrode to which the positive voltage is applied through the hole transport layer to the emissive layer, and electrons move from the The electrode applied with a negative voltage moves to the emissive layer through the electron transport layer, and in the emissive layer, electrons and holes recombine to generate excitons, and the excitons transition from the excited state to the ground state, and the energy radiation produces luminescence.

Organic light-emitting devices usually have relatively high requirements for luminous intensity as a light source. At present, increasing the luminous intensity of organic light-emitting devices is usually achieved by improving materials and adjusting and optimizing the device structure. However, the development of luminescent materials and improved devices that can emit high-intensity light The structure is relatively difficult, especially the effect of optimizing the structure of the device on increasing the luminous intensity is not obvious. If more than two light-emitting devices are superimposed in a specific way, and their luminance is summed, a relatively simple method can be obtained Organic light-emitting element with high luminous intensity.

Contents of the invention

The purpose of the present invention is to overcome the above-mentioned defects, provide a light-emitting device that can significantly improve the luminous brightness, simplify the manufacturing process, and can control the color of the emitted light by selecting a light-emitting material. An organic electroluminescent device with a laminated structure.

In order to realize the above-mentioned purpose of the invention, the present invention adopts following technical scheme:

A light-emitting device, comprising: a first organic electroluminescent device, the first organic electroluminescent device has a substrate and a light-emitting element comprising first and second electrodes formed on the substrate, wherein the substrate and the substrate At least one of the adjacent first electrodes has a light reflection function, and the second electrode away from the substrate is a transparent electrode; and

At least one second organic electroluminescent device stacked with the first organic electroluminescent device at intervals, the second organic electroluminescent device has a transparent substrate and the first and second electrodes formed on the transparent substrate are both The light-emitting element of the transparent electrode, and the light-emitting element of the at least one second organic electroluminescent device is close to the light-emitting side of the first organic electroluminescent device, and is stacked with the light-emitting element of the first organic electroluminescent device at intervals , the transparent substrate is away from the light-emitting side of the first organic electroluminescence device.

Wherein the substrate of the first organic electroluminescent device is used as a packaging sheet of the second organic electroluminescent device, and the substrate of the second organic electroluminescent device is used as a packaging sheet of the first organic electroluminescent device.

In the above-mentioned light-emitting device, the substrate of the first organic electroluminescent device has a light reflection function, for example, it can be metal or ceramics; or the first electrode adjacent to the substrate has a light reflection function, for example, it can have a thickness between 150 nm and ~300nm metal silver electrode, aluminum electrode or chromium electrode, etc.

In the above-mentioned light-emitting device, the transparent second electrode far away from the substrate in the first organic electroluminescent device can be a metal silver electrode, aluminum electrode or chromium electrode with a thickness of less than 25 nm, preferably less than 15 nm, or a metal stack electrode, or a laminated electrode of metal oxide and metal.

In the above light-emitting device, the first and second transparent electrodes in the second organic electroluminescent device may be metal oxide electrodes, such as one of indium tin oxide, zinc oxide, tin oxide, vanadium oxide or tungsten oxide, It can also be a metal electrode with a thinner thickness, such as a metal silver electrode, an aluminum electrode or a chromium electrode below 25nm, preferably a metal electrode below 15nm, or a stacked electrode of a metal, or a stacked electrode of a metal oxide and a metal .

In the above-mentioned light-emitting device, the first organic electroluminescent device and at least one second organic electroluminescent device are bonded and fixed together through an adhesive on the substrate.

In the above-mentioned light-emitting device, there is no connection between the two light-emitting elements of the relatively stacked first organic electroluminescent device and the adjacent second organic electroluminescent device, and a certain amount of space remains between the two light-emitting devices through an adhesive. interval.

In the above light-emitting device, the wavelength of light emitted by the first organic electroluminescent device and the wavelength of light emitted by at least one second organic electroluminescent device may be the same or different, and the wavelength of light emitted by a plurality of second organic electroluminescent devices The wavelengths can be the same or different.

In the above light-emitting device, there may be two or more second organic electroluminescent devices.

In the above light-emitting device, the substrate of one light-emitting device in any two adjacent light-emitting devices between two or more second organic electroluminescent devices is close to the light-emitting element of the other light-emitting device, and any two adjacent light-emitting devices Adjacent light emitting devices are stacked parallel to each other sequentially.

In the above-mentioned light-emitting device, any two adjacent second organic electroluminescent devices stacked in parallel are not connected, and an adhesive is used to keep a certain distance between the two light-emitting devices.

In the above-mentioned light-emitting device, the wavelength region of light emitted by the first organic electroluminescent device is 400 nm to 500 nm, the wavelength region of light emitted by one second organic electroluminescent device is 500 nm to 550 nm, and the other second organic electroluminescent device The wavelength region of the emitted light is above 600nm, and the combination of the three light emitting devices emits white light. Or the wavelength region of light emitted by the first organic electroluminescent device is 400nm-500nm, the wavelength region of light emitted by the second organic electroluminescent device is 560nm-600nm, and the combination of the two light-emitting devices emits white light.

A method for preparing a light emitting device, comprising the steps of:

1) sequentially vapor-depositing a first electrode, a light-emitting layer, and a transparent second electrode on the substrate to obtain a first organic electroluminescent device, wherein at least one of the substrate or the first electrode has a light reflection function;

2) sequentially vapor-depositing a transparent first electrode, a light-emitting layer, and a transparent second electrode on the transparent substrate to obtain at least one second organic electroluminescent device;

3) bonding and fixing the first organic electroluminescent device and at least one second organic electroluminescent device together with an adhesive, so that the light-emitting element of the at least one second organic electroluminescent device is close to the first organic electroluminescent device The light-emitting side of the organic electroluminescent device is stacked with the light-emitting element of the first organic electroluminescent device at intervals, and the transparent substrate is away from the light-emitting side of the first organic electroluminescent device, wherein the first organic electroluminescent device The substrate of the device and the substrate of the second organic electroluminescent device are mutually encapsulating sheets.

In the manufacturing method of the above-mentioned light-emitting device, the first organic electroluminescent device and at least one second organic electroluminescent device are bonded and fixed together through an adhesive on the substrate.

In the preparation method of the above-mentioned light-emitting device, there is no connection between the two light-emitting elements of the first organic electroluminescent device that is stacked oppositely and the adjacent second organic electroluminescent device, and the two light-emitting devices are connected through an adhesive. Keep a certain interval.

In the above method for preparing a light-emitting device, there are two or more second organic electroluminescent devices.

In the preparation method of the above-mentioned light-emitting device, the substrate of one light-emitting device in any two adjacent light-emitting devices between two or more second organic electroluminescent devices is close to the light-emitting element of the other light-emitting device, and any two light-emitting devices Two adjacent light-emitting devices are stacked parallel to each other.

In the manufacturing method of the above-mentioned light-emitting device, any two adjacent second organic electroluminescent devices stacked in parallel are not connected, and an adhesive is used to keep a certain distance between the two light-emitting devices.

In the manufacturing method of the above-mentioned light-emitting device, two or more second organic electroluminescent devices are bonded and fixed together through an adhesive on the substrate.

In the preparation method of the above-mentioned light-emitting device, the binder is an ultraviolet curable resin, preferably a cationic epoxy resin.

In the present invention, by adopting the above technical scheme, the first organic electroluminescent device and at least one second organic electroluminescent device are stacked in a specific way, and the electrode material and the material of the light-emitting layer are selected, thus obtaining the present invention Light emitting devices have the following advantages:

1. Increase the light output of the light-emitting device and improve the luminous intensity to prolong the service life of the light-emitting device

The luminous intensity of a light-emitting device is limited. In order to generate high-intensity light, it is necessary to increase the voltage or current applied to the light-emitting device. Due to the large voltage and current loads on the device, it is very easy to cause annihilation of the device, and the accelerator The attenuation of components, the present invention adopts the above technical scheme to realize the luminous intensity that cannot be achieved by a single device, increases the light output, and each luminous device works within the voltage and current range that does not affect their respective lifespan, which is also conducive to improving the overall luminous device. service life.

2. It can make it easier for the light-emitting device to display multiple colors, with chromaticity adjustable

Each light-emitting device can set light of different wavelengths to display multiple colors, which is not easy to achieve with a single light-emitting device. By selecting the material of the light-emitting layer and the structure of the light-emitting device, a single device can emit light of different colors, and the light intensity of light of different colors can be adjusted by adjusting the voltage. By superimposing and combining various light-emitting devices, the light of the required color can be obtained.

3. Simplify the process and make the preparation process simple

Usually, the preparation of a single light-emitting element needs to be packaged at the end of the preparation. In the light-emitting device with a laminated structure of the present invention, it is not necessary to separately package a single light-emitting device, but the substrate of one light-emitting device is used as the substrate of another light-emitting device. Encapsulating sheet, the substrate of another light-emitting device is used as the encapsulating sheet of the first light-emitting device, and each other is an encapsulating sheet, so as to complete the packaging of the entire light-emitting device. In actual operation, it is only necessary to bond the substrates of each light-emitting device The preparation process can be completed by bonding and fixing the agents together, so not only the process is saved, the cost is reduced, but also the operation process is greatly simplified.

Description of drawings

Fig. 1 is a structural schematic diagram of the first embodiment of the light-emitting device with a stacked structure in the present invention

11 the first organic electroluminescent device, 111 the substrate of the first organic electroluminescent device, 112 the first electrode of the first organic electroluminescent device, 113 the light emitting layer of the first organic electroluminescent device, 114 the first organic electroluminescent device The second electrode of the electroluminescent device, 115 the light-emitting element of the first organic electroluminescent device, 12 the second organic electroluminescent device, 121 the substrate of the second organic electroluminescent device, 122 the second organic electroluminescent device 123 The light-emitting layer of the second organic electroluminescent device, 124 The second electrode of the second organic electroluminescent device, 125 The light-emitting element of the second organic electroluminescent device, 000 Adhesive

Fig. 2 is a structural schematic diagram of another embodiment of a light-emitting device with a stacked structure in the present invention

21 the first organic electroluminescent device, 211 the substrate of the first organic electroluminescent device, 212 the first electrode of the first organic electroluminescent device, 213 the light emitting layer of the first organic electroluminescent device, 214 the first organic electroluminescent device The second electrode of the electroluminescent device, 215 the light-emitting element of the first organic electroluminescent device, 22 a second organic electroluminescent device, 221 the substrate of a second organic electroluminescent device, 222 a second organic electroluminescent device A first electrode of a luminescent device, 223 a light-emitting layer of a second organic electroluminescent device, 224 a second electrode of a second organic electroluminescent device, 225 a light-emitting element of a second organic electroluminescent device, 23 another An organic electroluminescent device, 231 a substrate of another second organic electroluminescent device, 232 a first electrode of another second organic electroluminescent device, 233 a light-emitting layer of another second organic electroluminescent device, 234 the second electrode of another second organic electroluminescent device, 235 the light-emitting element of another second organic electroluminescent device, 001 binder

Detailed ways

The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

Example 1

As shown in Fig. 1, it is a structural schematic diagram of the first embodiment of the present invention. The light-emitting device shown in the figure is formed by stacking a first organic electroluminescent device 11 and a second organic electroluminescent device 12, wherein the first The organic electroluminescent device 11 is top-emitting, and the second organic electroluminescent device 12 is arranged under the light-emitting side of the first organic electroluminescent device 11, and the light-emitting element 115 of the first organic electroluminescent device 11 is formed by the first pole 112, a light-emitting layer 113 and a second electrode 114, the light-emitting element 125 of the second organic electroluminescent device 12 is composed of the first electrode 122, the light-emitting layer 123 and the second electrode 124, and the light-emitting device shown in FIG. The light-emitting element 125 of the second organic electroluminescent device 12 is close to the light-emitting side of the first organic electroluminescent device 11 and overlapped with the light-emitting element 115 of the first organic electroluminescent device 11, and the transparent substrate 121 is away from the light-emitting side.

The opaque substrate 111 of the first organic electroluminescent device 11 and the transparent substrate 121 of the second organic electroluminescent device 12 are bonded and fixed together by an adhesive 000 . The substrate 111 of the first organic light-emitting device 11 is an opaque substrate with a light reflection function. Metal aluminum with a thickness of 200 nm is selected, and an indium tin oxide (ITO) film is sputtered on the aluminum substrate as the first electrode, and the thickness of ITO is 100 nm. , place the substrate with ITO in a vacuum chamber and evacuate to 5.0×10 ^-3 Pa, and evaporate the hole transport layer material NPB(N,N′-di-(1-naphthyl)-N , N'-diphenyl-1,1-biphenyl-4,4-diamine), the thickness of the evaporated film is 20nm, and its structure is shown in the following formula.

Tris(8-hydroxyquinolinic acid)aluminum (Alq ₃ for short) was vapor-deposited on the hole transport layer with a thickness of 30 nm as the light-emitting layer of the first organic electroluminescent device 11, and its structure is shown in the following formula. Then continue to vapor-deposit 20nm of Alq ₃ as the electron transport layer, and continue to vapor-deposit metallic silver on the above-mentioned electron transport layer as the second electrode 114 of the first organic light-emitting device 11. The film thickness of metallic silver is 10nm, and metallic silver The electrode 114 is a transparent electrode, thereby completing the preparation of the first organic electroluminescent device 11 in the light emitting device.

Next, the preparation of the second organic electroluminescent device 12 is carried out. First, a layer of ITO electrode is sputtered on a transparent glass substrate with a thickness of 100nm. The substrate with ITO is placed in a vacuum chamber and evacuated to 5.0×10 ^-3 Pa, the hole transport layer material NPB is vapor-deposited on the ITO surface, and the vapor-deposited film thickness is 20nm, and the 30nm-thick _Alq3 material is vapor-deposited on the hole-transport layer as the light-emitting layer of the first organic electroluminescent device, and thereafter Continue to vapor-deposit 20nm of _Alq3 as the electron transport layer, and continue to vapor-deposit one deck of 8-hydroxyquinoline lithium boride (LiBq4) on the above-mentioned electron transport layer as the electron injection layer of the device. The vapor-deposited film thickness is 1.0nm, and finally Evaporate metal silver on the electron injection layer as the second electrode 124 of the second organic light-emitting device 12, the film thickness of the metal silver is 10nm, and the metal silver electrode is a transparent electrode, thus completing the second organic electroluminescence in the light-emitting device Fabrication of Device 12 .

The first organic electroluminescent device 11 and the second organic electroluminescent device 12 are bonded and fixed together by coating the epoxy resin with a spacer on the substrate 111 or the substrate 121 outside the light-emitting elements 115 and 125 , so that the light-emitting device is sealed and becomes a structure isolated from the outside air, wherein the substrate 111 of the first organic electroluminescent device 11 is used as the encapsulation sheet of the second organic electroluminescent device 12, and the substrate of the second organic electroluminescent device The sheet 121 is used as the packaging sheet of the first organic light emitting device 11, and there is no need to package the light emitting device. In the prepared light emitting device, the light emitting element 115 of the first organic light emitting device 11 is close to the second organic light emitting device 12 The light-emitting elements 125 are superimposed on each other, and a certain distance is kept between them through a spacer with a certain height in the epoxy resin.

The metal aluminum substrate 111 of the first organic light-emitting device 11 is an opaque substrate and has a light reflection function. As shown in FIG. The first electrode 122 of 12 emits from the side, the substrate 121 of the second organic light emitting device 12 is a transparent glass substrate, and the first electrode 122 and the second electrode 124 are both transparent electrodes, and the emitted light can be emitted from the first electrode 122 respectively. side and the second electrode 124 side, the light emitted from the second electrode 124 side is reflected by the metal aluminum substrate of the first organic electroluminescent device 11, and finally from the first electrode 122 of the second organic electroluminescent device 12 side shot.

Example 2

As shown in Figure 2 is a schematic structural view of the second embodiment of the present invention, the light-emitting device shown in the figure is formed by stacking a first organic electroluminescent device 21 and two second organic electroluminescent devices 22, 23, Wherein the first organic electroluminescent device 21 is top emission, the second organic electroluminescent devices 22, 23 are arranged under the light-emitting side of the first organic electroluminescent device 21, and the light-emitting element of the first organic electroluminescent device 21 215 is composed of the first electrode 212, the light emitting layer 213 and the second electrode 214, the light emitting element 225 of one second organic electroluminescence device 22 is composed of the first electrode 222, the light emitting layer 223 and the second electrode 224, and the other second The light-emitting element 235 of the organic electroluminescent device 23 is made up of the first electrode 232, the light-emitting layer 233 and the second electrode 234, and the light-emitting element 225 of the second organic electroluminescent device 22 in the light-emitting device shown in FIG. 2 is close to the first The light-emitting side of the organic electroluminescent device 21 is superimposed on the light-emitting element 215 of the first organic electroluminescent device 21, the transparent substrate 221 is away from the light-emitting side, and the light-emitting element 235 of the second organic electroluminescent device 23 is close to the first organic electroluminescent device. The transparent substrate 221 of the two organic electroluminescent devices 22, and the two light emitting devices are stacked parallel to each other.

The first organic electroluminescent device 21 and the second organic electroluminescent device 22 and the second organic electroluminescent devices 22 and 23 are bonded and fixed together through the adhesive 001 on the substrate to form a light emitting device. The substrate 211 of the first organic electroluminescent device 21 selects a transparent glass substrate, and metal silver is vapor-deposited on the glass substrate as the first electrode. The thickness of the metal silver electrode is 200nm, which has a good light reflection function and will have The glass substrate of the silver electrode is placed in a vacuum chamber and evacuated to 5.0×10 ^-3 Pa, and the hole transport layer material NPB is evaporated on the surface of the silver electrode with a film thickness of 20nm, and then a 40nm-thick blue light-emitting layer is evaporated. Layer material TMADN (α-TMADN:β-TMADN=9:1).

Then continue to vapor-deposit 20nm of _Alq3 as the electron transport layer, continue to vapor-deposit 3nm metallic calcium on the above-mentioned electron transport layer, and then vapor-deposit 12nm metallic silver to form a Ca/Ag metal stack electrode as the second electrode 214, And the stacked electrode 214 is a transparent electrode, thus completing the preparation of the first organic electroluminescent device 21 in the light emitting device.

Next, the preparation of the second organic electroluminescent device 22 is carried out. First, a layer of ITO electrode is sputtered on a transparent glass substrate with a thickness of 80nm. The substrate with ITO is placed in a vacuum chamber and evacuated to 5.0×10 ^-3 Pa, the hole transport layer material _NPB is vapor-deposited on the surface of ITO, and the thickness of the vapor-deposited film is 20nm. 30nm.

Then continue to vapor-deposit 20nm of _Alq3 as the electron transport layer, continue to vapor-deposit a layer of LiBq4 on the above-mentioned electron transport layer as the electron injection layer of the device, the vapor deposition film thickness is 1.0nm, and finally evaporate 10nm Thick metallic silver serves as the second electrode 224 of the second organic light emitting device 22, and the metallic silver electrode is a transparent electrode, thereby completing the preparation of the second organic electroluminescent device 22 in the light emitting device.

The preparation method of the second organic electroluminescent device 23 and the selection of materials for each layer are the same as the second organic electroluminescent device 22, the difference is that the selection of the light-emitting layer material of the second organic electroluminescent device 23 is different, and the material of the light-emitting layer The host material is 5,6,11,12-tetraphenyltetracene (rubrene), the dopant is 1wt% DCJTB red light material, and the thickness of the light emitting layer is 30nm.

The first organic electroluminescent device 21 and the second organic electroluminescent device 22, 23 are bonded and fixed together by coating epoxy resin on the substrate outside the light-emitting element, so that the light-emitting device is sealed and becomes insulated from the outside air. Insulated structure, wherein the substrate 211 of the first organic electroluminescent device 21 is used as the encapsulation sheet of the second organic electroluminescent device 22, 23, and the substrate 231 of the second organic electroluminescent device 23 is used as the first organic electroluminescent device The packaging sheet of the light-emitting device 21 and the second organic electroluminescent device 22 does not need to package the light-emitting device. In the prepared light-emitting device, the second organic electroluminescent devices 22 and 23 are located in the first organic electroluminescent device. Below the light-emitting side of the device 21, and the light-emitting element 225 of the second organic electroluminescent device 22 is close to the light-emitting side of the first organic electroluminescent device 21, and is connected to the light-emitting element 215 of the first organic electroluminescent device 21 Relatively stacked, the substrate 221 of the second organic electroluminescent device 22 is close to the light-emitting element 235 of another second organic electroluminescent device 23, and the two light-emitting devices are arranged in parallel and stacked sequentially, between the light-emitting devices 21, 22 and 22 A spacer with a certain height in the epoxy resin keeps a certain distance between 23 and 23 .

The first electrode 212 of the first organic electroluminescent device 21 is an opaque electrode. As shown in FIG. Emit from the first electrode 232 side of the second organic electroluminescent device 23; the substrate 221 of the second organic electroluminescent device 22 is a transparent glass substrate, and the first electrode 222 and the second electrode 224 are transparent electrodes, The emitted light is respectively emitted from the first electrode 222 side and the second electrode 224 side, and the light emitted from the first electrode 222 side is emitted through the first electrode 232 side of the second organic electroluminescent device 23 whose layers are transparent, The light emitted from the side of the second electrode 224 is reflected by the first electrode 212 having a reflective function of the first organic electroluminescent device 21, and then emitted from the side of the first electrode 232 of the second organic electroluminescent device 23; The substrate 231 of the organic electroluminescent device 23 is a transparent glass substrate, and the first electrode 232 and the second electrode 234 are transparent electrodes, and the light emitted is respectively emitted from the first electrode 232 side and the second electrode 234 side, The light emitted from the side of the second electrode 234 passes through the second organic electroluminescent device 22 whose layers are transparent, is reflected by the first electrode 212 of the first organic electroluminescent device 21 which has a light reflection function, and finally passes through the The first electrode 232 of the second organic electroluminescent device 23 is emitted, and the above five beams of light are superimposed, so that the luminous brightness of the light emitting device is significantly enhanced.

In the above-mentioned embodiments, other light-emitting materials can also be selected in different light-emitting devices, and light of a desired color can be obtained through superposition and combination.

The technical solution of the present invention superimposes a plurality of light-emitting devices, and uses the substrate of one device as the packaging sheet of another device, which saves the packaging process, simplifies the process, and also realizes the improvement of the luminous intensity of the light-emitting device and the light emission. Color conversion.

Claims (18)

1. A lighting device, comprising: A first organic electroluminescent device, the first organic electroluminescent device has a substrate and a light-emitting element comprising first and second electrodes formed on the substrate, wherein the substrate and the first electrode adjacent to the substrate are at least One of them has a light reflection function, and the second electrode away from the substrate is a transparent electrode; and At least one second organic electroluminescent device stacked on the light-emitting side of the first organic electroluminescent device at intervals, the second organic electroluminescent device has a transparent substrate and first and second organic electroluminescent devices formed on the transparent substrate. The electrodes are all transparent electrodes, and the light-emitting element of the at least one second organic electroluminescent device is close to the light-emitting side of the first organic electroluminescent device, and is opposite to the light-emitting element of the first organic electroluminescent device. Stacked at intervals, the transparent substrate is away from the light-emitting side of the first organic electroluminescent device. Wherein the substrate of the first organic electroluminescent device is used as a packaging sheet of the second organic electroluminescent device, and the substrate of the second organic electroluminescent device is used as a packaging sheet of the first organic electroluminescent device. 2. The light-emitting device according to claim 1, wherein the substrate of the first organic electroluminescent device has a light-reflecting function. 3. The light-emitting device according to claim 1, characterized in that the first electrode of the first organic electroluminescence device adjacent to the substrate has a light reflection function. 4. The light-emitting device according to claim 1, characterized in that the first organic electroluminescent device and the at least one second organic electroluminescent device are fixed together by adhesive on the substrate . 5. The light-emitting device according to claim 1, characterized in that there is no connection between the two light-emitting elements of the first organic electroluminescent device and the adjacent second organic electroluminescent device. 6. The light-emitting device according to any one of claims 1-5, characterized in that the wavelength of light emitted by the first organic electroluminescent device is the same as the wavelength of light emitted by at least one second organic electroluminescent device or different. 7. The light-emitting device according to any one of claims 1-5, characterized in that there are two or more second organic electroluminescent devices. 8. The light-emitting device according to claim 7, characterized in that the substrate of one light-emitting device in any two adjacent light-emitting devices between the two or more second organic electroluminescent devices is close to the other to emit light. The light-emitting element of the device, and any two adjacent light-emitting devices are stacked parallel to each other. 9. The light emitting device according to claim 8, characterized in that any two adjacent second organic electroluminescent devices stacked in parallel are not connected. 10. The light-emitting device according to claim 6, characterized in that the wavelength region of light emitted by the first organic electroluminescent device is 400nm-500nm, and the wavelength region of light emitted by a second organic electroluminescent device is 500nm-500nm. 550nm, another second organic electroluminescent device emits light in a wavelength region above 600nm. 11. The method of manufacturing a light-emitting device according to claim 1, comprising: 1) sequentially vapor-depositing a first electrode, a light-emitting layer, and a transparent second electrode on the substrate to obtain a first organic electroluminescent device, wherein at least one of the substrate or the first electrode has a light reflection function; 2) sequentially vapor-depositing a transparent first electrode, a light-emitting layer, and a transparent second electrode on the transparent substrate to obtain at least one second organic electroluminescent device; 3) bonding and fixing the first organic electroluminescent device and at least one second organic electroluminescent device together with an adhesive, so that the light-emitting element of the at least one second organic electroluminescent device is close to the first organic electroluminescent device The light-emitting side of the organic electroluminescent device is stacked with the light-emitting element of the first organic electroluminescent device at intervals, and the transparent substrate is away from the light-emitting side of the first organic electroluminescent device, wherein the first organic electroluminescent device The substrate of the device and the substrate of the second organic electroluminescent device are mutually encapsulating sheets. 12. The method of manufacturing a light-emitting device according to claim 11, characterized in that the first organic electroluminescent device and at least one second organic electroluminescent device are bonded and fixed on the substrate by an adhesive on the substrate. Together. 13. The manufacturing method of a light-emitting device according to claim 11, characterized in that there is no connection between the two light-emitting elements of the first organic electroluminescent device and the adjacent second organic electroluminescent device. 14. The method for manufacturing a light-emitting device according to claim 11, characterized in that there are two or more second organic electroluminescent devices. 15. The method for manufacturing a light-emitting device according to claim 14, wherein the substrate of one light-emitting device in any two adjacent light-emitting devices between the two or more second organic electroluminescent devices A light-emitting element close to another light-emitting device, and any two adjacent light-emitting devices are stacked parallel to each other. 16. The method for manufacturing a light-emitting device according to claim 15, characterized in that any two adjacent second organic electroluminescent devices stacked in parallel are not connected. 17. The method for producing a light-emitting device according to claim 14, 15 or 16, characterized in that the two or more second organic electroluminescent devices are bonded and fixed together by an adhesive on the substrate . 18. The method for preparing a light-emitting device according to any one of claims 11-16, characterized in that the adhesive is a cationic epoxy resin.

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