Light-emitting modules and light-emitting devices

Abstract

This disclosure provides a light-emitting module and a light-emitting device, belonging to the field of lighting technology. The light-emitting module includes a first substrate, a functional layer disposed on the first substrate, and at least one light-emitting element. The light-emitting element has a first electrode, a light-emitting layer, and a second electrode sequentially disposed on the functional layer in a direction away from the first substrate. The functional layer is located on the side of the first electrode near the first substrate and is configured to convert the light emitted by the light-emitting element into light of a specific color. The functional layer includes N sub-functional layers sequentially disposed in a direction away from the first substrate, where N ≥ 3. Each sub-functional layer includes at least one first sub-functional layer and at least one second sub-functional layer. The first and second sub-functional layers are arranged alternately. The refractive index of the first sub-functional layer is greater than that of the second sub-functional layer.

Description

Technical Field

[0001] This disclosure belongs to the field of lighting technology, specifically relating to a light-emitting module and a light-emitting device. Background Technology

[0002] Traditional automotive taillights typically use light-emitting diodes (LEDs). However, with the development of organic light-emitting diodes (OLEDs), OLEDs offer advantages such as self-illumination, wide viewing angles, near-infinite contrast ratios, low power consumption, and extremely fast response times, gradually gaining increasing attention in the lighting technology field. OLED taillight products are becoming increasingly popular in the market and are becoming more diversified.

[0003] With the development of lighting and automotive technologies, taillights have become available in a wide variety of colors. Therefore, designing taillights with multiple colors to meet diverse market demands without increasing costs, such as the cost of photomasks, has become a pressing issue. Summary of the Invention

[0004] The present invention aims to solve at least one of the technical problems existing in the prior art, and to provide a light-emitting module and light-emitting device that can emit light in multiple colors without increasing the cost of the photomask.

[0005] In a first aspect, embodiments of this disclosure provide a light-emitting module, which includes a first substrate, a functional layer disposed on the first substrate, and at least one light-emitting element;

[0006] The light-emitting element is provided with a first electrode, a light-emitting layer and a second electrode in sequence on the functional layer in a direction away from the first substrate.

[0007] The functional layer is located on the side of the first electrode close to the first substrate and is configured to convert the light emitted by the light-emitting element into light of a specific color; wherein, the functional layer includes N sub-functional layers arranged sequentially away from the first substrate, where N≥3;

[0008] The sub-functional layer includes at least one first sub-functional layer and at least one second sub-functional layer; the first sub-functional layer and the second sub-functional layer are arranged alternately; the refractive index of the first sub-functional layer is greater than the refractive index of the second sub-functional layer.

[0009] The material of the first sub-functional layer is silicon nitride or silicon oxynitride.

[0010] The refractive index of the material in the first sub-functional layer is 1.6-2.0.

[0011] The material of the second sub-functional layer is silicon oxide.

[0012] The refractive index of the material in the second sub-functional layer is 1.2-1.6.

[0013] The functional layer comprises N sub-functional layers, where N≥3; the sub-functional layer closest to the light-emitting element is the first sub-functional layer.

[0014] The functional layer comprises N sub-functional layers, where N≥3; the sub-functional layer closest to the light-emitting element is the second sub-functional layer.

[0015] When the emitted light color of the light-emitting module is orange-red, the functional layer includes two first sub-functional layers and a second sub-functional layer sandwiched between the two first sub-functional layers; the thickness of the first sub-functional layer is 66nm; and the thickness of the second sub-functional layer is 50nm.

[0016] When the emitted light color of the light-emitting module is red, the functional layer includes two first sub-functional layers and a second sub-functional layer sandwiched between the two first sub-functional layers; the thickness of the first sub-functional layer is 66nm; and the thickness of the second sub-functional layer is 70nm.

[0017] The first electrode is a transparent electrode; the second electrode is a reflective electrode.

[0018] The light-emitting module further includes a second substrate disposed opposite to the first substrate, and a reflective layer disposed on the side of the second substrate away from the light-emitting element;

[0019] The orthographic projection of the reflective layer onto the first substrate covers the orthographic projection of the reflective electrodes of each of the light-emitting elements onto the first substrate.

[0020] The light-emitting module further includes an encapsulation substrate and an encapsulation structure located at the edge of the light-emitting module and disposed between the first substrate and the second substrate;

[0021] The encapsulation substrate is located on the side of the functional layer away from the first substrate; the second electrode portion of the light-emitting element located at the edge of the light-emitting module covers the encapsulation substrate;

[0022] The encapsulation structure is used to seal the edges of the light-emitting module.

[0023] The encapsulation substrate includes a main structure and multiple branch structures; the encapsulation structure is at least partially embedded in the gaps formed between the various branch structures.

[0024] Secondly, embodiments of this disclosure provide a light-emitting device, including any of the light-emitting modules described above. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the structure of a light-emitting element provided in an embodiment of the present disclosure;

[0026] Figure 2 This is a schematic diagram of the structure of the light-emitting layer of the light-emitting element in an embodiment of this disclosure;

[0027] Figure 3 This is a schematic diagram of a light-emitting module structure provided in an embodiment of the present disclosure;

[0028] Figure 4 This is a schematic diagram of the functional layer structure provided in the embodiments of this disclosure;

[0029] The reference numerals in the figures are as follows: 101, first substrate; 102, second substrate; 103, reflective layer; 201, functional layer; 2011, first sub-functional layer; 2012, second sub-functional layer; 202, packaging substrate; 203, first electrode; 204, light-emitting layer; 205, second electrode; 301, packaging structure; HIL, hole injection layer; HTL, hole transport layer; EBL, electron blocking layer; EML, organic light-emitting layer; HBL, hole blocking layer; ETL, electron transport layer. Detailed Implementation

[0030] To enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0031] Unless otherwise defined, the technical or scientific terms used in this disclosure shall have the ordinary meaning understood by one of ordinary skill in the art to which this disclosure pertains. The terms “first,” “second,” and similar terms used in this disclosure do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Similarly, the terms “an,” “a,” or “the,” and similar terms do not indicate a quantity limitation, but rather indicate the presence of at least one. The terms “including,” “comprising,” or “containing,” and similar terms mean that the element or object preceding the word encompasses the elements or objects listed following the word and their equivalents, without excluding other elements or objects. The terms “connected,” “linked,” or similar terms are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. The terms “upper,” “lower,” “left,” and “right,” etc., are used only to indicate relative positional relationships, and these relative positional relationships may change accordingly when the absolute position of the described objects changes.

[0032] The light-emitting elements used in lighting modules are typically light-emitting diodes (LEDs). With the development of organic light-emitting diodes (OLEDs), which offer advantages such as self-illumination, wide viewing angles, near-infinite contrast ratios, low power consumption, and extremely fast response times, they are increasingly being used in the lighting technology field. Meanwhile, in the automotive market, the requirements for taillight lighting quality are becoming increasingly stringent, making OLED taillight products increasingly popular, and taillights with multiple colors are also gaining favor. How to design taillights with multiple colors without increasing costs has become a problem that needs to be solved.

[0033] Therefore, this disclosure provides a taillight product with multiple colors without increasing the cost of photomasks. Improving organic light-emitting diodes (OLEDs) to have multiple colors may increase the number of manufacturing processes and photomasks, which account for a significant portion of the cost in OLED production. The light-emitting module in this disclosure can produce taillights with multiple colors without increasing the number of photomasks or manufacturing processes, thus enabling taillights to have multiple colors.

[0034] The light-emitting module of this disclosure will be described below with reference to the accompanying drawings and specific embodiments.

[0035] In a first aspect, embodiments of this disclosure provide a light-emitting module. Figure 1 This is a schematic diagram of the structure of a light-emitting element provided in an embodiment of the present disclosure. Figure 2 This is a schematic diagram of the structure of the light-emitting layer of the light-emitting element in an embodiment of this disclosure; Figure 3 This is a schematic diagram of a light-emitting module structure provided in an embodiment of the present disclosure, as shown below. Figure 1-3 As shown, the light-emitting module includes a first substrate 101, a functional layer 201 disposed on the first substrate 101, and at least one light-emitting element. The at least one light-emitting element has a first electrode 203, a light-emitting layer 204, and a second electrode 205 sequentially disposed on the functional layer 201. The functional layer 201 is configured to convert the light emitted by the light-emitting element into light of a specific color. At least three sub-functional layers are sequentially disposed on the functional layer 201 away from the first substrate 101.

[0036] The light-emitting element in this embodiment is an organic light-emitting diode (OLED). The OLED structure includes an anode, a light-emitting layer 204, and a cathode sequentially disposed on a substrate. The light-emitting layer 204 includes a hole injection layer (HIL), a hole transport layer (HTL), an electron blocking layer (EBL), an organic light-emitting layer (EML), another hole blocking layer (HBL), and an electron transport layer (ETL). After applying a voltage to the anode and cathode, holes and electrons are injected from the anode and cathode, respectively, and enter the HOMO (highest occupied molecular orbital) energy level of the hole transport layer (HTL) and the LUMO (lowest vacant molecular orbital) energy level of the electron transport layer (ETL), respectively. They then transition to the organic light-emitting layer (EML) to meet and form electron-hole pairs, i.e., excitons. The excitons in the excited molecular state are released as photons, emitting visible light.

[0037] Organic light-emitting diodes (OLEDs) include two types: top-emitting OLEDs and bottom-emitting OLEDs. Top-emitting OLEDs emit light in a direction away from the substrate, meaning light is emitted from the cathode side. A top-emitting OLED consists of an anode, a hole injection layer (HIL), a hole transport layer (HTL), an electron blocking layer (EBL), an organic light-emitting layer (EML), another hole blocking layer (HBL), an electron transport layer (ETL), and a cathode, sequentially arranged on the substrate. The anode is a metal electrode with some light reflectivity; the cathode is a semi-transparent or transparent electrode. The first substrate 101 can be a metal, an organic synthetic material, or an inorganic synthetic material. Bottom-emitting organic light-emitting diodes emit light in the opposite direction to top-emitting organic light-emitting diodes, emitting light along the direction close to the substrate, that is, emitting light from one side of the substrate. The bottom-emitting organic light-emitting diode has an anode, a hole injection layer (HIL), a hole transport layer (HTL), an electron blocking layer (EBL), an organic light-emitting layer (EML), a hole blocking layer (HBL), an electron transport layer (ETL), and a cathode sequentially disposed on the first substrate 101. Its anode is a transparent electrode with good light emission properties. Its cathode is a reflective electrode that can reflect most of the light so that it can be emitted from one side of the substrate. The substrate is usually made of a material with excellent light transmission properties, such as glass or a transparent film.

[0038] It should be noted that in the light-emitting process of a bottom-emitting organic light-emitting diode (OLED), a portion of the light emitted from the organic light-emitting layer (EML) directly passes through the transparent electrode used as the anode and exits from the substrate. A portion of the light from the EML also propagates to the reflective electrode used as the cathode, where it is reflected. The reflected light resonates with each other, and simultaneously, the reflected light and the light propagating from the EML to the transparent electrode resonate, creating a microcavity effect that increases the brightness of the OLED. Similarly, in a top-emitting OLED, a portion of the light from the EML directly exits the cathode, while a portion is reflected by the metal anode, also creating a microcavity effect and increasing the brightness. Both top-emitting and bottom-emitting OLEDs can be used; this embodiment will be described using a bottom-emitting OLED as an example.

[0039] like Figure 1 As shown, in this embodiment of the light-emitting element, a first electrode 203, a light-emitting layer 204, and a second electrode 205 are sequentially disposed on the functional layer 201. The orthographic projection of the second electrode 205 onto the functional layer 201 completely covers the orthographic projection of the light-emitting layer 204 onto the functional layer 201, and the orthographic projection of the light-emitting layer 204 onto the functional layer 201 completely covers the orthographic projection of the first electrode 203 onto the functional layer 201. The first electrode 203 is a transparent electrode and serves as the anode of the light-emitting element; the second electrode 205 is a reflective electrode and serves as the cathode of the light-emitting element. It is understood that the second electrode 205 completely covers the light-emitting layer 204, thus reflecting as much light emitted from the light-emitting layer 204 as possible and improving the brightness of the light-emitting element.

[0040] It should be noted that the material of the second electrode 205 can be any one of aluminum (Al), silver (Ag), titanium (Ti), and molybdenum (Mo), or an alloy of any combination thereof, and the material of the first electrode 203 can be indium tin oxide (ITO) or other conductive materials with good light transmittance. In this embodiment, the specific materials of the first electrode 203 and the second electrode 205 are not further limited.

[0041] like Figure 2As shown, the light-emitting layer 204 in this embodiment includes a hole injection layer HIL, a hole transport layer HTL, an electron blocking layer EBL, an organic light-emitting layer EML, a hole blocking layer HBL, and an electron transport layer ETL, sequentially disposed along the first electrode 203 away from the functional layer 201. The first electrode 203 is a transparent electrode and serves as the anode, and the second electrode 205 is a reflective electrode and serves as the cathode. By applying voltages to the anode and cathode, holes and electrons are injected from the anode and cathode respectively, and enter the HOMO (highest occupied molecular orbital) energy level of the hole transport layer HTL and the LUMO (lowest vacant molecular orbital) energy level of the electron transport layer ETL, respectively. They then transition to the organic light-emitting layer EML to meet and form electron-hole pairs, i.e., excitons. The excitons in the excited molecular state are released in the form of photons, causing the organic light-emitting layer EML to emit visible light. Part of the visible light emitted by the organic light-emitting layer (EML) is emitted from the first electrode 203, which serves as the anode, and the other part is emitted from the second electrode 205, which serves as the cathode, and reflected by the second electrode 205. In this process, the light emitted by the second electrode 205 resonates with each other, and the reflected light also resonates with the light that propagates directly from the organic light-emitting layer (EML) to the first electrode 203, thereby forming a microcavity effect and improving the luminous brightness of the light-emitting element.

[0042] It should be noted that, in order to improve the light emission quality, the thickness or number of layers of the light emission layer 204 can be changed, and the material of each layer can also be changed. In this disclosure, no further limitations are made on the thickness, number of layers, and material of the light emission layer 204.

[0043] like Figure 3 As shown, the light-emitting module in this embodiment includes a first substrate 101, a functional layer 201 and at least one light-emitting element sequentially disposed on the first substrate 101. The functional layer 201 is configured to convert the light emitted by the light-emitting element into light of a specific color. At least three sub-functional layers are sequentially disposed on the functional layer 201 away from the first substrate 101. Each sub-functional layer includes a first sub-functional layer 2011 and a second sub-functional layer 2012, which are arranged alternately. The refractive index of the first sub-functional layer 2011 is greater than that of the second sub-functional layer 2012. The different refractive indices of the first sub-functional layer 2011 and the second sub-functional layer 2012 allow the light emitted by the light-emitting element to change color when passing through the functional layer 201, thus achieving multi-color display in the light-emitting module. It is understood that the light-emitting module can have one light-emitting element or multiple light-emitting elements, and the number of light-emitting elements can be adjusted according to actual usage.

[0044] In some examples, the first sub-functional layer 2011 is made of silicon nitride or silicon oxynitride with a refractive index between 1.6 and 2.0. The second sub-functional layer 2012 is made of silicon oxide with a refractive index between 1.2 and 1.6. To achieve multiple refractions of light through functional layer 201 and filter out the desired specific color of light, the first sub-functional layer 2011 and the second sub-functional layer 2012 need to be arranged alternately.

[0045] Furthermore, the functional layer 201 may include at least three sub-functional layers 201, which include alternating first sub-functional layers 2011 and second sub-functional layers 2012. It is understood that the functional layer 201 may have more than three sub-functional layers, for example: four sub-functional layers, two first sub-functional layers 2011 and two second sub-functional layers 2012, or five or six sub-functional layers. The first sub-functional layer 2011 is made of silicon nitride or silicon oxynitride, therefore the material of the first sub-functional layer 2011 can be SiNx. The second sub-functional layer 2012 is made of silicon oxide, therefore the material of the second sub-functional layer 2012 can also be SiO2. This embodiment of the present disclosure uses an example where the functional layer 201 has three sub-functional layers, the first sub-functional layer 2011 is made of SiNx, and the second sub-functional layer 2012 is made of SiO2.

[0046] Table 1:

[0047]

[0048] Figure 4 This is a schematic diagram of the functional layer structure provided in the embodiments of this disclosure, such as... Figure 4 As shown in Table 1, in this embodiment of the present disclosure, functional layer 201 includes three sub-functional layers: two first sub-functional layers 2011 and one second sub-functional layer 2012. The two first sub-functional layers 2011 are sandwiched within each other. As shown in Table 1, the two first sub-functional layers 2011 have the same thickness and refractive index, both being 66 nm thick and SiNx thin films. In the experiment, a 330 nm thick molybdenum (Mo) film was used as the second electrode 205. By changing the thickness of the second sub-functional layer 2012, the color of the light after passing through functional layer 201 was altered. Ultimately, the CIE coordinates of the specific colors of light produced by the light reflected from the second electrode 205 when the same color light is incident on the second electrode 205 and passes through functional layers 201 corresponding to different thicknesses of the second sub-functional layer 2012 were obtained.

[0049] Furthermore, as shown in Table 1, during the experiment, the thickness of both first sub-functional layers 2011 of the sample was maintained at 66 nm, and the thickness of the molybdenum (Mo) layer used for reflection was 330 nm. By changing the thickness of the second sub-functional layer 2012 sandwiched between the two first sub-functional layers 2011, the color of the light was changed. As shown in Table 1, in sample 1, the thickness of the second sub-functional layer 2012 was 50 nm. Under this condition, the CIE coordinates of the color of the light reflected from the molybdenum (Mo) layer and refracted through the three sub-functional layers were (0.4592, 0.4517), and the color corresponding to this coordinate was red. The thickness of sample 2, when used in the light-emitting module, could make the light-emitting module emit orange-red light. In sample 2, the thickness of the second sub-functional layer 2012 is 70 nm. Under this condition, the CIE coordinates of the color of light reflected from the molybdenum (Mo) layer and refracted through the three sub-functional layers are (0.4244, 0.3227), corresponding to a red color. The thickness of sample 2, when used in a light-emitting module, allows the module to emit red light. In sample 5, the thickness of the second sub-functional layer 2012 is 130 nm. Under this condition, the CIE coordinates of the color of light reflected from the molybdenum (Mo) layer and refracted through the three sub-functional layers are (0.1766, 0.2477), corresponding to a blue color. The thickness of sample 5, when used in a light-emitting module, allows the module to emit blue light. In sample 7, the thickness of the second sub-functional layer 2012 is 170 nm. Under this condition, the CIE coordinates of the color of light reflected from the molybdenum (Mo) layer and refracted through the three sub-functional layers are (0.3131, 0.4256), corresponding to a green color. The thickness of sample 7, when used in a light-emitting module, allows the module to emit green light. In sample 3, the thickness of the second sub-functional layer 2012 is 90 nm, reflecting and emitting purple light. In samples 4 and 6, the thicknesses of the second sub-functional layer 2012 are 110 nm and 150 nm, respectively, both reflecting and emitting blue light. In sample 8, the thickness of the second sub-functional layer 2012 is 190 nm, reflecting and emitting yellow light. Taking a three-layer sub-functional structure, with a second sub-functional layer 2012 sandwiched between two first sub-functional layers 2011, as an example, the CIE coordinates of the color of light refracted through the three sub-functional layers can be changed by altering the thickness of the middle second sub-functional layer 2012. When these functional layers are used in a light-emitting module, the module can emit light of a specific color. The samples in Table 1 are only some examples of embodiments of this disclosure. By changing the thickness of the second sub-functional layer 2012, or by changing the thickness of the first sub-functional layer and the molybdenum (Mo) layer, the CIE coordinates of light other than those of the eight samples in Table 1 can be obtained and used in a display module to emit more types of specific colors of light.

[0050] It should be noted that the thickness and material of the first sub-functional layer 2011, the material of the second sub-functional layer 2012, and the material of the second electrode 205 in this disclosure can be changed or adjusted according to specific products. For example, the silicon nitride material used in the first sub-functional layer 2011 may be SiNx, and the silicon nitride material used in the second sub-functional layer 2012 may be SiO2. The above examples are only used to better illustrate the technical solutions in this disclosure and do not further limit the thickness of the first sub-functional layer 2011, the second sub-functional layer 2012, and the second electrode 205.

[0051] Understandably, the light-emitting module in this disclosure adds a functional layer 201 to achieve multi-color display, eliminating the need to modify the organic light-emitting diode (OLED) used as the light-emitting element, thus avoiding increased mask costs. Furthermore, since OLEDs can be manufactured to emit monochromatic light, using the functional layer 201 to change the color of the light-emitting module can also simplify some aspects of the OLED manufacturing process.

[0052] In some examples, functional layer 201 includes at least three sub-functional layers. The multi-layered sub-functional layers include at least one first sub-functional layer 2011 and at least one second sub-functional layer 2012, with the first sub-functional layer 2011 and the second sub-functional layer 2012 alternately arranged. The sub-functional layer closest to the light-emitting element is the first sub-functional layer. It is understood that the first sub-functional layer 2011, with its higher refractive index, is preferentially positioned near the first electrode 203, and the light reflected from the second electrode 205 first passes through the first sub-functional layer 2011 with its higher refractive index.

[0053] In some examples, functional layer 201 includes at least three sub-functional layers, with at least one first sub-functional layer 2011 and at least one second sub-functional layer 2012, which are alternately arranged. The sub-functional layer closest to the light-emitting element is the second sub-functional layer. It is understood that the second sub-functional layer 2012 with a lower refractive index may also be preferentially positioned near the first electrode 203, and the light reflected from the second electrode 205 first passes through the second sub-functional layer 2012 with the lower refractive index.

[0054] In some examples, the light-emitting module further includes a second substrate 102 disposed opposite to the first substrate 101, and a reflective layer 103 disposed on the side of the second substrate 102 away from the light-emitting element. The second electrode 205 in the light-emitting element is a reflective electrode used to reflect visible light emitted by the light-emitting layer 204 back to the first substrate 101. The reflective layer 103 is disposed in the direction away from the first substrate 101 used for light emission from the second electrode 205 of each light-emitting element. This reflective layer 103 can reflect light that the second electrode 205 in each light-emitting element fails to reflect back to the first substrate 101 used for light emission, reducing light loss caused by some light not being completely reflected back to the first substrate 101 by the second electrode 205, thereby increasing the effective light emission of the light-emitting module and improving the overall brightness of the light-emitting module. To further enhance the effect of the reflective layer 103, the orthographic projection of the reflective layer on the first substrate 101 covers the orthographic projection of the second electrode 205 of each light-emitting element on the first substrate 101. Understandably, the reflective layer 103 covers all the second electrodes 205 of each light-emitting element.

[0055] It should be noted that the material of the reflective layer 103 can be the same as or different from the material of the second electrode 205. The material of the reflective layer 103 can be molybdenum (Mo) or any one of aluminum (Al), silver (Ag), titanium (Ti), or an alloy of any of the above. In this embodiment, the material of the reflective layer 103 is not further limited.

[0056] In some examples, the light-emitting module further includes an encapsulation substrate 202 and an encapsulation structure 301 located at the edge of the light-emitting module and disposed between the first substrate 101 and the second substrate 102. The encapsulation substrate 202 is located on the side of the functional layer away from the first substrate 101; the second electrode 205 of the light-emitting element located at the edge of the light-emitting module partially covers the encapsulation substrate 202. The encapsulation structure 301 is used to seal the edge of the light-emitting module to prevent water, oxygen, etc., from entering the light-emitting module, which could damage the light-emitting element or shorten the lifespan of the light-emitting module.

[0057] In some examples, the encapsulation substrate 202 includes a main structure and multiple branch structures, with the encapsulation structure 301 at least partially embedded in the gaps formed between the branch structures. The branch structures increase the overlap area between the encapsulation structure and the encapsulation substrate, making the encapsulation structure more securely fixed to the light-emitting module and achieving a better encapsulation effect.

[0058] It should be noted that a second substrate 102 may be disposed between the reflective layer 103 and the encapsulation structure 301. The material of the second substrate 102 may be the same as that of the first substrate 101, such as glass or a material with excellent light transmission. No further limitations are made on the materials of the first substrate 101 and the second substrate 102 here.

[0059] Secondly, embodiments of this disclosure provide a light-emitting device, including any of the light-emitting modules described above. The light-emitting device may be a taillight or other light-emitting device using organic light-emitting diodes.

[0060] It is understood that the above embodiments are merely exemplary implementations used to illustrate the principles of the present invention, and the present invention is not limited thereto. For those skilled in the art, various modifications and improvements can be made without departing from the spirit and essence of the present invention, and these modifications and improvements are also considered to be within the scope of protection of the present invention.

Claims

1. A light-emitting module, comprising a first substrate, a functional layer disposed on the first substrate, and at least one light-emitting element; The light-emitting element is provided with a first electrode, a light-emitting layer and a second electrode in sequence on the functional layer in a direction away from the first substrate. The functional layer is located on the side of the first electrode closest to the first substrate and is configured to convert the light emitted by the light-emitting element into light of a specific color; wherein, The functional layer includes N sub-functional layers arranged sequentially away from the first substrate, where N≥3; The sub-functional layer includes two first sub-functional layers and one second sub-functional layer; the second sub-functional layer is located between the two first sub-functional layers; the refractive index of the first sub-functional layer is greater than the refractive index of the second functional layer; The two first sub-functional layers have the same thickness and refractive index, and the color of light can be changed by changing the thickness of the second sub-functional layer; Both of the first sub-functional layers are 66 nm thick and satisfy at least one of the following conditions: When the thickness of the second sub-functional layer is 50nm or 70nm, the color of the light refracted through the three sub-functional layers is red. When the thickness of the second sub-functional layer is 110nm, 130nm or 150nm, the color of the light refracted through the three sub-functional layers is blue. With the second sub-functional layer having a thickness of 170nm, the color of light refracted through the three sub-functional layers is green. When the thickness of the second sub-functional layer is 190 nm, the color of the light refracted through the three sub-functional layers is yellow. When the thickness of the second sub-functional layer is 90 nm, the color of the light refracted through the three sub-functional layers is purple.

2. The light-emitting module according to claim 1, characterized in that, The material of the first sub-functional layer is silicon nitride or silicon oxynitride.

3. The light-emitting module according to claim 2, characterized in that, The refractive index of the material in the first sub-functional layer is 1.6-2.

0.

4. The light-emitting module according to claim 1, characterized in that, The second sub-functional layer material is silicon oxide.

5. The light-emitting module according to claim 4, characterized in that, The refractive index of the material of the second sub-functional layer is 1.2-1.

6.

6. The light-emitting module according to claim 1, characterized in that, The functional layer includes N sub-functional layers, where N≥3; the sub-functional layer that is closest to the light-emitting element is the first sub-functional layer.

7. The light-emitting module according to claim 1, characterized in that, The functional layer includes N sub-functional layers, where N≥3; the sub-functional layer that is closest to the light-emitting element is the second sub-functional layer.

8. The light-emitting module according to claim 1, characterized in that, When the emitted light color of the light-emitting module is orange-red, the functional layer includes two first sub-functional layers and a second sub-functional layer sandwiched between the two first sub-functional layers; the thickness of the first sub-functional layer is 66nm; and the thickness of the second sub-functional layer is 50nm.

9. The light-emitting module according to claim 1, characterized in that, When the emitted light color of the light-emitting module is red, the functional layer includes two first sub-functional layers and a second sub-functional layer sandwiched between the two first sub-functional layers; the thickness of the first sub-functional layer is 66nm; and the thickness of the second sub-functional layer is 70nm.

10. The light-emitting module according to claim 1, characterized in that, The first electrode is a transparent electrode; the second electrode is a reflective electrode.

11. The light-emitting module according to claim 10, characterized in that, The light-emitting module further includes a second substrate disposed opposite to the first substrate, and a reflective layer disposed on the side of the second substrate away from the light-emitting element; The orthographic projection of the reflective layer onto the first substrate covers the orthographic projection of the reflective electrodes of each of the light-emitting elements onto the first substrate.

12. The light-emitting module according to claim 11, characterized in that, The light-emitting module also includes a packaging substrate and a packaging structure located at the edge of the light-emitting module and disposed between the first substrate and the second substrate; The packaging substrate is located on the side of the functional layer away from the first substrate. The second electrode portion of the light-emitting element located at the edge of the light-emitting module covers the packaging substrate; The encapsulation structure is used to seal the edges of the light-emitting module.

13. The light-emitting module according to claim 12, characterized in that, The encapsulation substrate includes a main structure and multiple branch structures; the encapsulation structure is at least partially embedded in the gaps formed between the various branch structures.

14. A light-emitting device, characterized in that, Includes the light-emitting module described in any one of claims 1-13.

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