Infrared light source with laminated structure

Abstract

The invention relates to the field of infrared light sources, in particular to an infrared light source of a laminated structure. The invention provides an infrared light source with a laminated structure. The infrared light source of the laminated structure comprises a plurality of infrared light-emitting assemblies, the infrared light-emitting assemblies are arranged in a laminated mode, and the infrared light-emitting assemblies are of an infrared-transmitting structure. According to the infrared light source of the laminated structure, the infrared light-emitting assemblies are stacked together for use, the infrared light power density of unit area is increased by means of the characteristic that all the infrared light-emitting assemblies transmit infrared rays, and the infrared light source is simple, reliable, low in price and capable of being used and popularized in a large area.

Description

Technical Field

[0001] The invention relates to the field of infrared light sources, and in particular to an infrared light source with a laminated structure. Background Art

[0002] Infrared light sources can be used in photoacoustic spectrometers and Fourier infrared spectrometers. According to the characteristics of the spectrometer, the stronger the infrared light source, the higher the detection accuracy. The efficiency of infrared light sources currently on the market is generally very low, and the power density within a specific spectral range is not high. If the infrared laser has a very high power density within a specific spectrum, it will be expensive and its electro-optical conversion efficiency will not be high. Therefore, an infrared light source with a particularly high power density is particularly needed.

[0003] Traditional infrared light sources include tungsten lamps, silicon carbon rods, high-pressure sodium lamps, and xenon lamps. Due to their own limitations, silicon carbon rods are limited by temperature regulation according to the blackbody radiation theory, because the temperature of blackbody radiation corresponding to the peak wavelength of general infrared light is very low, so its total radiation power is limited, and it is difficult to obtain a high light power density light source. Other traditional infrared light sources, such as carbon nanotubes or black graphene (which is relatively thick and opaque), are generally huge in area, and optical design is difficult. In addition, the light source they emit also includes part of the visible spectrum, and the infrared spectrum is only a part of it. It is currently difficult to obtain a light source with a high light power density.

[0004] At present, the spectrum of tungsten lamps, high-pressure sodium lamps, and xenon lamps is difficult to adjust, and the traditional variable-power light sources are also relatively expensive and difficult to achieve good adjustment.

[0005] At present, silicon carbon rods waste a lot of energy, making it difficult to achieve efficient electrical-infrared conversion efficiency. They have high energy consumption and are difficult to achieve as a light source for a large area.

[0006] Since traditional infrared light sources such as silicon carbon rods and graphite are generally isotropic, the infrared rays emitted by them are also isotropic. Most of the time when we use infrared rays, we hope that our infrared light source will irradiate in a specific direction. Infrared rays generally use aluminum reflectors, which leads to a relatively large area of ​​later optical design components and the effect is not particularly good. Therefore, how to make a directional infrared light source is a difficult problem. In addition, silicon carbon rods and graphite are generally three-dimensional. After heating, a lot of infrared light is emitted from the inside. Then, due to the high refractive index of the crystal itself, infrared rays are emitted from the inside. Because the infrared rays enter the sparse material from the dense material and undergo total reflection, the refractive index of the dense material is greater than 3, and the refractive index of the sparse material is 1 (such as air). The refractive index of both is too large, the light output angle is very small, and the total reflection angle is very large, resulting in most of the infrared rays emitted from the inside cannot be emitted due to the total reflection factor. Therefore, the infrared efficiency of silicon carbon rods is very low, and the emitted infrared power is very low. Therefore, how to reduce total reflection, reduce electrothermal efficiency, and improve electro-infrared efficiency is an urgent problem to be solved.

[0007] In view of the above situation, an infrared light source with a laminated structure is proposed in the prior art. Summary of the invention

[0008] In order to solve the above problems, the present invention proposes an infrared light source with a laminated structure, which includes a plurality of infrared light-emitting components, which are laminated and have an infrared-transmitting structure.

[0009] Furthermore, the infrared light-emitting component includes an infrared-transmitting substrate and a graphene light-emitting layer;

[0010] The graphene light-emitting layer is arranged on the upper side of the infrared-transmitting substrate.

[0011] Furthermore, the infrared-transmitting substrate is made of non-conductive material.

[0012] Furthermore, the infrared-transmitting substrate is made of ZnS or / and Si or / and GaAs or / and Ge or / and ZnSe or / and chalcogenide glass or / and sulfide halide glass.

[0013] Furthermore, the graphene light-emitting layer is matched with the infrared-transmitting substrate, and the graphene light-emitting layer and the infrared-transmitting substrate are arranged in a one-to-one correspondence.

[0014] Furthermore, the infrared-transmitting substrate and the graphene light-emitting layer are hemispherical or curved.

[0015] Furthermore, the infrared light source of the stacked structure also includes a reflector, which wraps the multiple infrared light-emitting components.

[0016] Furthermore, the infrared light source of the stacked structure also includes electrodes. Electrodes are arranged on both sides of the multiple infrared light-emitting components, and the electrodes are divided into positive and negative electrodes.

[0017] The infrared light source of the laminated structure of the present invention increases the infrared light power density per unit area by stacking multiple infrared light-emitting components together and utilizing the infrared-transmitting property of the infrared light-emitting components. It is simple, reliable, low-cost, and can be promoted and used over a large area. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0019] Figure 1 It is a side view of the infrared light source of the laminated structure of the present invention.

[0020] Description of reference numerals:

[0021] 1: infrared-transmitting substrate; 2: graphene light-emitting layer; 3: electrode; 4: reflector; 31: positive electrode; 32: negative electrode. DETAILED DESCRIPTION

[0022] The technical solution of the present invention will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0023] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0024] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, "multiple" means two or more, unless otherwise clearly and specifically defined. In addition, the terms "installed", "connected" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal connection of two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0025] like Figure 1 The figure shows a side view of the laminated infrared light source of the present invention. In this embodiment, a laminated infrared light source is provided, which includes a plurality of infrared light emitting components, which are laminated and have an infrared-transmitting structure.

[0026] The infrared light emitting component comprises an infrared transparent substrate 1 and a graphene light emitting layer 2 , wherein the graphene light emitting layer 2 is arranged on the upper side of the infrared transparent substrate 1 .

[0027] Furthermore, the number of the plurality of substrates is greater than or equal to 2, and the infrared-transmitting substrate 1 is made of a non-conductive material.

[0028] Furthermore, the infrared-transmitting substrate 1 is made of ZnS or / and Si or / and GaAs or / and Ge or / and ZnSe or / and chalcogenide glass or / and sulfide halide glass.

[0029] Furthermore, the number of the graphene light-emitting layer 2 matched with the substrate and the number of the plurality of infrared-transmitting substrates 1 are in one-to-one correspondence.

[0030] Furthermore, the infrared-transmitting substrate 1 and the graphene light-emitting layer 2 can be made into a hemispherical or curved shape, so that the infrared rays emitted by the graphene layer can be focused to one point, thereby increasing the optical power of the infrared focusing point.

[0031] Furthermore, the infrared light source of the laminated structure further comprises a reflector 4, which wraps a plurality of infrared-transmitting substrates 1 and a graphene light-emitting layer 2 matched with the substrates.

[0032] Since the infrared light source with a laminated structure emits in all directions, the infrared rays from all sides are reflected to the front through a reflector to increase the intensity of the infrared rays.

[0033] Furthermore, the electrodes 3 are located on both sides of the plurality of infrared light-emitting components, and the electrodes are divided into a positive electrode 31 and a negative electrode 32 .

[0034] Furthermore, the infrared-transmitting substrate 1, the graphene light-emitting layer 2, the electrode 3 and the reflector 4 are also provided with supporting materials correspondingly, and the supporting materials enable the positions of the infrared-transmitting substrate 1, the graphene light-emitting layer 2, the electrode 3 and the reflector 4 to be relatively fixed.

[0035] Many people have been studying the ohmic contact between graphene and metal electrodes. By adjusting parameters such as the work function of graphene and combining appropriate processes, ohmic contact with metal can be obtained, contact resistance can be reduced, and electrical-infrared conversion efficiency can be improved. This part belongs to the existing technology and will not be introduced in detail.

[0036] It should be noted that: when in use, a separate control switch is set for each infrared light-emitting component, and the infrared intensity of the front is tested to determine how many layers of infrared emission are turned on.

[0037] Aiming at the problem of the current lack of specific directivity of infrared light sources, the problem of the traditional infrared light sources with too large total reflection angle, high electrothermal efficiency and too low electric infrared efficiency, and the problem of difficulty in realizing the infrared light source of volume light source, this paper proposes a laminated structure infrared light source. This light source has the advantages of reducing the total reflection angle, directivity, low electrothermal efficiency, high electric infrared efficiency, and volume light source.

[0038] The infrared light source of the laminated structure of the present invention increases the infrared light power density per unit area by stacking multiple infrared light-emitting components together and utilizing the infrared-transmitting property of the infrared light-emitting components. It is simple, reliable, low-cost, and can be promoted and used over a large area.

[0039] In the prior art, multi-layer emission can also be achieved through graphite. Since the thickness of graphite is difficult to control, when heating, due to the thickness, the infrared emitted by the graphite inside cannot be emitted to the outside due to the reflection and absorption of multiple layers, resulting in energy waste. This is not energy-saving, because each layer cannot be controlled individually, so it will be heated together, and the number of luminous layers cannot be adjusted according to the emission intensity of infrared rays; and the area of ​​each layer of graphite may not be so flat, and sometimes the layers are mixed and inserted, which will cause the generated current to not flow evenly through each layer of graphene, so that some graphene currents are large and some are small, which will cause the temperature generated by graphene to be uneven, so that its infrared distribution is also relatively complex. For controlling infrared radiation with a specific spectrum and intensity, graphite heating is not a good method. However, each layer of stacked graphene can be controlled individually, and then the current control of each layer can achieve high-precision adjustment very well, and the current and the number of heated layers will be adjusted according to the size of the infrared thermal radiation, which can achieve high-precision infrared spectrum and intensity regulation, and can also achieve efficient energy-saving control, and can better achieve carbon neutrality.

[0040] Specifically, because the silicon carbon rod is a crystal, the refractive index of the crystal itself is very high, so the infrared rays are emitted from the inside. Because the infrared rays enter the light-sparse material from the light-dense material and undergo total reflection, the refractive index of the light-dense material is more than 3, and the light-sparse material is air 1. The refractive index of both is too large, the light-emitting angle is very small, and the total reflection angle is very large, resulting in most of the infrared rays emitted from the inside cannot be emitted due to the total reflection factor. Therefore, the infrared efficiency of the silicon carbon rod is very low, and the emitted infrared power is very low. The same reason also happens to the graphite light source. The infrared refractive index of graphite is much larger than that of air, resulting in only a small part of the infrared rays emitted from the inside of the graphite being emitted. Most of the infrared rays are repeatedly absorbed and emitted inside the graphite, resulting in a large amount of heat, and its own electrical infrared conversion efficiency is particularly low.

[0041] The single-layer graphene in the present application can be well emitted into the air, because one side of the graphene is air and the other side is infrared crystal. The thickness of graphite is very thin, much lower than the infrared wavelength. Therefore, according to optical theory, especially the evanescent wave theory, no total reflection will occur from graphene to the air, so the light extraction efficiency is very high. Then the other layer of graphene is infrared crystal. Since the refractive index of infrared crystal is generally high, such as the refractive index of silicon is about 3.4, which is relatively large, strong reflection will occur from graphene to infrared crystal, which will make the infrared light generated by graphene have the directionality of upward emission, increase the infrared power, so that more light is emitted from the front of the light source, and the light extraction efficiency is improved.

[0042] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. An infrared light source with a laminated structure, characterized in that: The infrared light source of the stacked structure includes a plurality of infrared light-emitting components, the plurality of infrared light-emitting components are stacked, and the infrared light-emitting components are infrared-transmitting structures.

2. The infrared light source of the laminated structure according to claim 1, characterized in that: The infrared light-emitting component comprises an infrared-transmitting substrate and a graphene light-emitting layer; The graphene light-emitting layer is arranged on the upper side of the infrared-transmitting substrate.

3. The infrared light source of the laminated structure according to claim 2, characterized in that: The infrared-transmitting substrate is made of non-conductive material.

4. The infrared light source of the laminated structure according to claim 3, characterized in that: The infrared-transmitting substrate is made of ZnS or / and Si or / and GaAs or / and Ge or / and ZnSe or / and chalcogenide glass or / and sulfide halide glass.

5. The infrared light source of the laminated structure according to claim 2, characterized in that: The graphene light-emitting layer is matched with the infrared-transmitting substrate, and the graphene light-emitting layer and the infrared-transmitting substrate are arranged in a one-to-one correspondence.

6. The infrared light source of the laminated structure according to claim 2, characterized in that: The infrared-transmitting substrate and the graphene light-emitting layer are hemispherical or curved.

7. The infrared light source of the laminated structure according to claim 1, characterized in that: The infrared light source of the stacked structure further comprises a reflector, which wraps a plurality of infrared light-emitting components.

8. The infrared light source of the laminated structure according to claim 7, characterized in that: The infrared light source of the stacked structure also includes electrodes. Electrodes are arranged on both sides of the plurality of infrared light-emitting components, and the electrodes are divided into positive and negative electrodes.

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