Light emitting device and light emitting apparatus

Abstract

The utility model discloses a kind of light emitting devices, including at least one first light emitting element, at least one second light emitting element and light guide plate;The light guide plate is arranged in the light-exit surface of the second light emitting element, and the first light emitting element is arranged in the side of the light guide plate and the side of the light guide plate is the light-exit surface of the first light emitting element;The wavelength of the first light emitting element is different from the wavelength of the second light emitting element.The utility model embodiment is through the light guide plate and can make the complementary of the light emitting efficiency of different wavelength first light emitting element and second light emitting element, fully combines the light emitting efficiency advantage of first light emitting element and second light emitting element under different wavelength, and then improves the light emitting efficiency of light emitting device under specific wavelength.

Description

Technical Field

[0001] This utility model relates to the field of light sources, and in particular to a light-emitting device and a light-emitting apparatus. Background Technology

[0002] Light sources are mainly divided into point light sources and surface light sources. Organic light-emitting devices (OLEDs) are the most representative surface light source devices. Due to their surface light source, thinness, and flexibility, they have shown great advantages in the fields of lighting, phototherapy, and photomedicine. However, due to limitations in materials and manufacturing processes, some surface light sources have low luminous efficiency in specific wavelengths. How to improve the luminous efficiency of surface light sources in specific wavelengths has become a technical problem that the industry urgently needs to solve. Utility Model Content

[0003] This utility model provides a light-emitting device and a light-emitting apparatus to solve the problem of low luminous efficiency of existing surface light sources in specific wavelength bands.

[0004] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0005] This utility model embodiment provides a light-emitting device including: at least one first light-emitting element, at least one second light-emitting element, and a light guide plate; the light guide plate is disposed on the light-emitting surface of the second light-emitting element, the first light-emitting element is disposed on the side of the light guide plate, and the side of the first light-emitting element close to the light guide plate is the light-emitting surface of the first light-emitting element; the wavelength of the first light-emitting element is different from the wavelength of the second light-emitting element.

[0006] Optionally, the first light-emitting element is an inorganic light-emitting diode, the second light-emitting element is an organic light-emitting diode, and the wavelength of the first light-emitting element is greater than the wavelength of the second light-emitting element.

[0007] Optionally, the wavelength of the first light-emitting element is greater than or equal to 760 nm.

[0008] Optionally, a plurality of the first light-emitting elements are evenly arranged on the side of the light guide plate, and the light-emitting surfaces of the plurality of the first light-emitting elements are disposed close to the side of the light guide plate.

[0009] Optionally, the light-emitting device includes n first light-emitting elements. When n=2, the projections of the light-emitting directions of two first light-emitting elements onto the light-emitting surface of the light guide plate do not coincide.

[0010] When n≥3, the projections of the light-emitting directions of the n first light-emitting elements onto the light-emitting surface of the light guide plate intersect each other, and the light-emitting directions of the first light-emitting elements form a closed n-sided polygon inside the light guide plate, wherein the light-emitting surface of the light guide plate is the side of the light guide plate away from the second light-emitting element.

[0011] Optionally, the shape of the light guide plate includes a circle or a polygon, and the projected area of ​​the light guide plate on the second light-emitting element is smaller than that of the second light-emitting element; the light guide plate also includes a receiving groove disposed on the side edge of the light guide plate, and the first light-emitting element is disposed in the receiving groove.

[0012] Optionally, the area of ​​the light guide plate on the side closer to the second light-emitting element is larger than the area of ​​the light guide plate on the side farther from the second light-emitting element, and the angle between the side of the light guide plate and the light-emitting surface of the second light-emitting element is greater than or equal to 10 degrees and less than or equal to 90 degrees.

[0013] Optionally, the angle between the side of the light guide plate and the light-emitting surface of the second light-emitting element is greater than or equal to 15 degrees and less than or equal to 75 degrees.

[0014] Optionally, the light guide plate further includes at least one groove disposed near the side of the second light-emitting element, and / or the light-emitting device further includes a light-scattering layer disposed near the side of the second light-emitting element near the light guide plate.

[0015] Optionally, the groove in the cross section perpendicular to the second light-emitting element can be at least one of a polygon, a semicircle, and a semi-ellipse; the groove in the cross section parallel to the second light-emitting element can be at least one of a polygon, a circle, and an ellipse.

[0016] Optionally, the light guide plate is made of a transparent or semi-transparent material, and the average transmittance of the light guide plate in the visible light band and the non-visible light band is greater than 60%; and / or, a light reflection layer is further provided on the side of the light guide plate, and the light reflection layer includes clearance holes that allow the first light-emitting element to pass through.

[0017] This utility model embodiment also provides a light-emitting device including the above-mentioned light-emitting device and a housing for placing the light-emitting device.

[0018] An embodiment of this utility model provides a light-emitting device comprising at least one first light-emitting element, at least one second light-emitting element, and a light guide plate; the light guide plate is disposed on the light-emitting surface of the second light-emitting element, and the first light-emitting element is disposed on the side of the light guide plate; the wavelength of the first light-emitting element is different from the wavelength of the second light-emitting element. This embodiment of the utility model, by setting a light guide plate, enables the first and second light-emitting elements with different wavelengths to complement each other in terms of luminous efficiency, fully combining the advantages of the luminous efficiency of the first and second light-emitting elements at different wavelengths, thereby improving the luminous efficiency of the light-emitting device at a specific wavelength. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments of this utility model will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the content of the embodiments of this utility model and these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the structure of a light-emitting device provided in an embodiment of the present invention;

[0021] Figures 2A-2B This is a schematic diagram of the structure of another light-emitting device provided in this embodiment of the utility model;

[0022] Figure 3 This is a schematic diagram of the structure of another light-emitting device provided in this embodiment of the utility model;

[0023] Figures 4A-4C This is a schematic diagram of the structure of another light-emitting device provided in this embodiment of the utility model;

[0024] Figure 5 This is a schematic diagram of the structure of another light-emitting device provided in this embodiment of the utility model;

[0025] Figure 6 This is a schematic diagram of another light guide plate provided in this embodiment of the utility model;

[0026] Figure 7 This is a schematic diagram of the structure of another light-emitting device provided in this embodiment of the utility model;

[0027] Figure 8 This is a schematic diagram of another light guide plate provided in this embodiment of the utility model;

[0028] Figure 9 This is a schematic diagram of the structure of another light-emitting device provided in this embodiment of the utility model. Detailed Implementation

[0029] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, not the entire structure.

[0030] Based on the above-mentioned technical problems, this embodiment proposes the following solutions:

[0031] Figure 1 This is a schematic diagram of the structure of a light-emitting device provided in an embodiment of this utility model. See also... Figure 1 The present invention provides a light-emitting device comprising at least one first light-emitting element 1, at least one second light-emitting element 2, and a light guide plate 3; the light guide plate 3 is disposed on the light-emitting surface of the second light-emitting element, the first light-emitting element 1 is disposed on the side of the light guide plate, and the side of the first light-emitting element 1 closest to the light guide plate is the light-emitting surface of the first light-emitting element 1; the wavelength of the first light-emitting element 1 is different from the wavelength of the second light-emitting element.

[0032] Specifically, the wavelength of the first light-emitting element 1 is different from that of the second light-emitting element 2. This can be because the wavelength of the first light-emitting element 1 is greater than that of the second light-emitting element 2, or the wavelength of the first light-emitting element 1 is less than that of the second light-emitting element 2. In addition, due to limitations in materials and structure, a larger wavelength range of the light-emitting element will lead to a decrease in the luminous efficiency of the light-emitting element. However, in this embodiment, the use of two different wavelengths, the first light-emitting element 1 and the second light-emitting element 2, can not only increase the emission wavelength range of the light-emitting device, but also improve the luminous efficiency of the light-emitting device at different wavelengths, thereby improving the luminous efficiency of the light-emitting device.

[0033] The light guide plate 3 is made of transparent or semi-transparent material, such as polymethyl methacrylate (PMMA), polystyrene (PS), polycarbonate (PC) or other transparent resin materials. The light guide plate 3 has an average transmittance of more than 60% in the visible light band and the non-visible light band.

[0034] Specifically, the first light-emitting element 1 includes a light-emitting surface from which light is emitted and a non-light-emitting surface from which light cannot be emitted. The second light-emitting element 2 also includes a light-emitting surface from which light is emitted and a non-light-emitting surface from which light cannot be emitted. A light guide plate 3 is disposed on the light-emitting surface of the second light-emitting element 2, and the light-emitting surface of the first light-emitting element 1 is disposed near the side of the light guide plate 3. This arrangement allows light emitted from the second light-emitting element 2 to enter the light guide plate 3 through one side, or light emitted from the first light-emitting element 1 to enter the light guide plate 3 through the side. The light is emitted from the light guide plate 3 away from the second light-emitting element 2. The first light-emitting element 1 and the second light-emitting element 2 can emit light simultaneously or individually. When both emit light simultaneously, the light guide plate 3 mixes the light emitted by the first light-emitting element 1 and the second light-emitting element 2 before emitting it. When both emit light individually, the light guide plate 3 mixes the light emitted by the first light-emitting element 1 and the second light-emitting element 2 before emitting it. In this embodiment, the luminous efficiency and luminous wavelength range of the light-emitting device can be improved by setting the light guide plate 3.

[0035] This utility model provides a light-emitting device comprising at least one first light-emitting element 1, at least one second light-emitting element 2, and a light guide plate 3. The light guide plate 3 is disposed on the light-emitting surface of the second light-emitting element 2, and the first light-emitting element 1 is disposed on the side of the light guide plate 3. The wavelength of the first light-emitting element 1 is different from the wavelength of the second light-emitting element 2. By setting the light guide plate 3, the luminous efficiency of the first light-emitting element 1 and the second light-emitting element 2 at different wavelengths can be complementary, fully combining the luminous efficiency advantages of the first light-emitting element 1 and the second light-emitting element 2 at different wavelengths, thereby improving the luminous efficiency of the light-emitting device at a specific wavelength.

[0036] Optionally, the first light-emitting element 1 is an inorganic light-emitting diode, and the second light-emitting element 2 is an organic light-emitting diode, wherein the wavelength of the first light-emitting element is greater than the wavelength of the second light-emitting element.

[0037] Specifically, OLED (Organic Light Emitting Diode) refers to the phenomenon of light emission caused by carrier injection and recombination in organic semiconductor materials and light-emitting materials under the drive of an electric field. The principle involves using transparent / semi-transparent metal / metal oxide electrodes as the anode and cathode of the device, respectively. Under the drive of an external electric field, carriers (electrons and holes) are injected from the cathode and anode into the electron and hole transport functional layers, respectively. The electrons and holes are then transferred through the electron and hole transport functional layers to the light-emitting layer, forming excitons in the light-emitting material. The confined electron-hole recombination within the excitons disappears, and the energy is radiated as visible light (the emission wavelength is limited by the characteristics of the light-emitting material; different light-emitting materials result in different visible light emission wavelengths). OLEDs have shown significant advantages in lighting, phototherapy, and photomedicine due to their surface light source, thinness, and flexibility. However, currently, due to limitations in OLED materials, their luminous efficiency is relatively low in specific wavelengths such as blue light, near-ultraviolet, and near-infrared. On the other hand, LED (Light Emitting Diode) refers to an inorganic semiconductor light-emitting device, which also emits light through carrier injection and recombination. LEDs have higher luminous efficiency than OLEDs in specific wavelength bands such as blue light, near ultraviolet light, and near infrared light.

[0038] In this embodiment, an LED is used as the first light-emitting element 1, and an OLED is used as the second light-emitting element 2. The light emitted by the OLED is emitted directly through the light guide plate 3. Part of the light emitted by the LED enters the interior of the light guide plate 3 and is emitted directly to its outer surface, while part of the light is reflected by the OLED and emitted to the outer surface of the light guide plate 3. Furthermore, this embodiment also sets the wavelength of the LED to be greater than that of the OLED, thereby compensating for the low luminous efficiency of the OLED in a specific wavelength band and improving the luminous efficiency of the light-emitting device.

[0039] Furthermore, the wavelength of the first light-emitting element 1 is greater than or equal to 760 nm.

[0040] In this embodiment, the wavelength of the first light-emitting element 1 is set to be greater than or equal to 760nm, so that the light emitted by the first light-emitting element 1 is invisible infrared light. When the light emitted by the second light-emitting element 2 is visible light, the first light-emitting element 1 emits invisible infrared light, thereby improving the luminous efficiency of the light-emitting device in the invisible light band.

[0041] Optional, Figures 2A-2B This is a schematic diagram of the structure of another light-emitting device provided in an embodiment of this utility model; see reference. Figures 2A-2B Multiple first light-emitting elements 1 are evenly arranged on the side of the light guide plate 3, and the light-emitting surfaces of the multiple first light-emitting elements 1 are arranged close to the side of the light guide plate 3.

[0042] Specifically, the number of the first light-emitting elements 1 can be three, four, six, or eight, see reference. Figure 2A Four first light-emitting elements 1 are evenly arranged on the side of the light guide plate 3. Figure 2B Eight first light-emitting elements 1 are arranged sequentially on the side of the light guide plate 3, with the light-emitting surface of each first light-emitting element 1 positioned close to the side of the light guide plate 3. This results in all the light-emitting surfaces of the first light-emitting elements 1 facing the geometric center of the light guide plate 3. For example, see [continued]. Figure 2A and Figure 2B When the light guide plate 3 is circular, the emitting surfaces of all the first light-emitting elements 1 arranged around the light guide plate 3 face the center of the circular light guide plate 3. When the light guide plate 3 is rectangular (not shown in the figure), the emitting surfaces of all the first light-emitting elements 1 arranged around the light guide plate 3 face the center of the rectangular light guide plate 3. Through the above arrangement, on the one hand, the light emitted by the first light-emitting device through the light guide plate 3 can be made uniform, and on the other hand, the light emission intensity of the light-emitting device in a specific wavelength band can be improved.

[0043] Optional, Figure 3 This is a schematic diagram of another light-emitting device provided by an embodiment of the present utility model. In order to improve the light uniformity of the light-emitting device, the light-emitting device includes n first light-emitting elements. When n=2, the projections of the light-emitting directions of the two first light-emitting elements on the light-emitting surface of the light guide plate do not coincide. When n≥3, the projections of the light-emitting directions of the n first light-emitting elements on the light-emitting surface of the light guide plate intersect each other. The light-emitting directions of the first light-emitting elements form a closed n-sided polygon inside the light guide plate. The light-emitting surface of the light guide plate is the side of the light guide plate away from the second light-emitting element.

[0044] When n=2, to improve the light uniformity of the light-emitting device, the projections of the light-emitting directions of the two first light-emitting elements onto the light-emitting surface of the light guide plate should not coincide. To ensure the light-emitting intensity of the light-emitting device, the number of first light-emitting elements should be greater than or equal to 3. (Refer to...) Figure 3 , Figure 3The diagram shows the staggered arrangement of the light-emitting elements 1 on opposite sides of the light guide plate 3. Four first light-emitting elements 1 are evenly arranged along the side of the light guide plate 3. The first light-emitting elements are symmetrical about each other along either the horizontal or vertical axis of the light guide plate 3. The light rays emitted perpendicularly from the light-emitting surfaces of the two first light-emitting elements 1 on one opposite side are designated as first ray 11 and second ray 12. The light rays emitted perpendicularly from the light-emitting surfaces of the two first light-emitting elements 1 on the other opposite side are designated as third ray 13 and fourth ray 14. First ray 11, second ray 12, third ray 13, and fourth ray 14 represent the light-emitting directions of their respective first light-emitting elements 1. The projections of line 13 and the fourth ray 14 onto the light-emitting surface of the light guide plate form a closed quadrilateral. The projections of the first ray 11 and the second ray 12 onto the light guide plate are parallel and do not overlap, as are the projections of the third ray 13 and the fourth ray 14. If the first ray 11 and the second ray 12 overlap, the brightness at the overlapping position will be higher, resulting in poor light uniformity of the light-emitting device. In this embodiment, by limiting the projections of the light-emitting directions of n first light-emitting elements onto the light-emitting surface of the light guide plate to intersect each other, the light-emitting directions of the first light-emitting elements form a closed n-sided quadrilateral inside the light guide plate, thereby improving the light uniformity of the light-emitting device.

[0045] Optional, Figures 4A-4C This is a schematic diagram of another light-emitting device provided in an embodiment of the present invention. Based on the above embodiments, see... Figures 4A-4C The shape of the light guide plate 3 includes a circle or a polygon, and the projected area of ​​the light guide plate 3 on the second light-emitting element 2 is smaller than that of the second light-emitting element 2.

[0046] Specifically, the light guide plate 3 is disposed on the light-emitting surface of the second light-emitting element 2. To improve the compatibility between the second light-emitting element 2 and the light guide plate 3, the light guide plate 3 can be configured as a circle or a polygon, see [reference]. Figure 4A and Figure 4B When the second light-emitting element 2 is rectangular, the light guide plate 3 can be either circular or rectangular, as shown in the reference. Figure 4C When the second light-emitting element 2 is circular, the light guide plate 3 is also circular.

[0047] Since the light guide plate 3 is set on the light-emitting surface of the second light-emitting element 2, the projected area of ​​the light guide plate 3 on the second light-emitting element 2 is smaller than that of the second light-emitting element 2. This allows all the light emitted from the light-emitting surface of the second light-emitting element 2 to pass through the light guide plate 3 and enter the interior of the light guide plate 3 on the side close to the second light-emitting element 2. Then, the light is emitted through the side of the light guide plate 3 away from the second light-emitting element 2, thereby improving the luminous efficiency of the light-emitting device.

[0048] Optional, Figure 5 This is a schematic diagram of the structure of another light-emitting device provided in this embodiment of the utility model; Figure 6 This is a schematic diagram of another light guide plate provided in an embodiment of this utility model. (Reference) Figure 5 and Figure 6 The light guide plate 3 further includes a receiving groove 31 disposed on the side edge of the light guide plate 3, and the first light-emitting element 1 is disposed in the receiving groove 31.

[0049] Specifically, in order to better achieve the combination of the light guide plate 3 and the first light-emitting element 1 and improve the firmness of the combination, a receiving groove 31 adapted to the installation of the first light-emitting element 1 is opened on the side plane of the light guide plate 3. The receiving groove 31 can be rectangular or circular, and its specific shape can be determined according to the shape of the first light-emitting element 1 and the connection method between the first light-emitting element 1 and the light guide plate 3. For example, if the first light-emitting element 1 and the light guide plate 3 are connected by adhesive, the shape of the receiving groove 31 is preferably the same as the shape of the first light-emitting element 1. For example, if the first light-emitting element 1 and the light guide plate 3 are connected by snap-fit, the shape of the receiving groove 31 is preferably snap-fit ​​adapted to the shape of the first light-emitting element 1. In this embodiment, by setting a receiving groove 31 for placing the first light-emitting element 1 on the side edge of the light guide plate 3, the firmness of the combination between the first light-emitting element 1 and the light guide plate 3 is improved.

[0050] Optional, continue to refer to Figure 1 The area of ​​the light guide plate 3 on the side closer to the second light-emitting element 2 is larger than the area of ​​the light guide plate 3 on the side farther from the second light-emitting element 2. The angle between the side of the light guide plate 3 and the light-emitting surface of the second light-emitting element 2 is greater than or equal to 10 degrees and less than or equal to 90 degrees. Preferably, the angle between the side of the light guide plate and the light-emitting surface of the second light-emitting element is greater than or equal to 15 degrees and less than or equal to 75 degrees.

[0051] Specifically, the side of the light guide plate 3 is an inclined surface that slopes towards the geometric center of the light guide plate 3. The side of the light guide plate 3 closer to the second light-emitting element 2 is the lower surface, and the side farther away from the second light-emitting element 2 is the upper surface. (Reference) Figure 1The area of ​​the light guide plate 3 on the side closer to the second light-emitting element 2 is greater than the area of ​​the light guide plate 3 on the side farther away from the second light-emitting element 2. That is, the side view of the light guide plate 3 is trapezoidal, and the length of the upper side of the light guide plate 3 is less than the length of the lower side. The side that the light-emitting surface of the second light-emitting element 2 contacts is the lower side of the light guide plate 3. In other words, the angle between the side side of the light guide plate 3 and the lower side of the light guide plate 3 is greater than or equal to 10 degrees and less than or equal to 90 degrees. It can be 10 degrees, 15 degrees, 30 degrees, 45 degrees, 60 degrees, 75 degrees, or 90 degrees. In this embodiment, the side of the light guide plate 3 is inclined, so that the light emitting surface of the first light-emitting element 1 is set on the side of the light guide plate 3, and the light emitting direction of the first light-emitting element 1 is at a certain angle to the light guide plate 3. This allows the light emitted by the first light-emitting element 1 to directly reach the upper or lower surface of the light guide plate 3 after it is incident on the light guide plate 3. When the light reaches the upper surface of the light guide plate 3, it is directly emitted through the upper surface of the light guide plate 3. When the light reaches the lower surface of the light guide plate 3, it is reflected by the second light-emitting element 2 and emitted from the upper surface of the light guide plate 3, thereby improving the luminous efficiency of the light-emitting device.

[0052] On the other hand, in this embodiment, the angle between the side of the light guide plate 3 and the light-emitting surface of the second light-emitting element 2 is greater than or equal to 15 degrees and less than or equal to 75 degrees. This is to ensure that the light emitted by the first light-emitting element 1 exits through the upper surface of the light guide plate 3, or exits through the light guide plate 3 after being reflected by the second light-emitting element 2. If the angle is too large, more light will be incident parallel to the surface of the light guide plate 3 and exit from the side of the light guide plate 3, resulting in low luminous efficiency of the light-emitting device. If the angle is too small, the light will be concentrated at the edge of the light guide plate 3, resulting in poor light uniformity of the light-emitting device.

[0053] Optional, Figure 7 This is a schematic diagram of the structure of another light-emitting device provided in this embodiment of the utility model. Figure 8 This is a schematic diagram of another light guide plate provided in an embodiment of the present invention; see reference. Figure 7 In order to further improve the light uniformity of the light-emitting device, the light guide plate 3 also includes at least one groove 4 disposed on the side near the second light-emitting element 2, and / or the light-emitting device also includes a light scattering layer disposed on the side of the second light-emitting element 2 near the light guide plate 3.

[0054] Specifically, the light guide plate 3 is disposed in the groove 4 on the side close to the second light-emitting element 2. There can be one or more grooves, see reference. Figure 8 Multiple grooves 4 are evenly arranged on the side of the light guide plate 3 near the second light-emitting element 2. In this embodiment, by setting one side of the light guide plate 3 to be an uneven surface, the incident angle distribution of light can be changed, so that the incident light in the original single direction produces a randomly distributed incident angle on different micro-surfaces, thereby destroying the conditions required for total internal reflection, reducing the probability of total internal reflection, and improving the luminous efficiency of the light-emitting device.

[0055] Optionally, the cross-section of the groove 4 perpendicular to the second light-emitting element can be at least one of polygon, semi-circle, and semi-ellipse; the cross-section of the groove 4 parallel to the second light-emitting element can be at least one of polygon, circle, and ellipse.

[0056] On the other hand, the light-emitting device also includes a light-scattering layer disposed on the side of the second light-emitting element 2 near the light guide plate 3. The light-scattering layer can be disposed between the light guide plate 3 and the second light-emitting element 2, or it can be disposed on the side of the light guide plate 3 away from the second light-emitting element 2. It can be achieved by doping with scattering particles. In this embodiment, the specific structure and implementation of the light-scattering layer are not limited, as long as the purpose of scattering the light emitted by the second light-emitting element 2 is achieved, thereby improving the light uniformity of the light-emitting device.

[0057] Optional, Figure 9 This is a schematic diagram of another light-emitting device provided in an embodiment of the present invention, for reference. Figure 9 The light guide plate 3 is also provided with a light reflection layer 5 on its side, and the light reflection layer 5 includes a clearance hole that allows the first light-emitting element 1 to pass through.

[0058] Specifically, the light-reflecting layer 5 may include one or more of chromium, silver, or aluminum. The light-reflecting layer 5 is disposed on the side of the light guide plate 3. To ensure that the light-emitting surface of the first light-emitting element 1 is tightly fitted to the side of the light guide plate 3, the light-reflecting layer 5 also has clearance holes that allow the first light-emitting element 1 to pass through. The light emitted from the light-emitting surface of the first light-emitting element 1 enters the light guide plate 3 through the clearance holes, is reflected by the second light-emitting element 2, and reaches the side of the light guide plate 3. Because the light-reflecting layer 5 is disposed on the side of the light guide plate 3, the light is reflected back into the light guide plate 3 by the light-reflecting layer 5 and finally emitted through the upper surface of the light guide plate 3. In this embodiment, by providing the light-reflecting layer 5 on the side of the light guide plate 3, the luminous efficiency of the light-emitting device is improved.

[0059] This utility model embodiment also provides a light-emitting device, including the light-emitting device in the above embodiment and a housing for placing the light-emitting device.

[0060] Specifically, the light-emitting device serves as the light source for the light-emitting apparatus, providing uniform light for its specific application. To ensure the normal operation of the light-emitting apparatus, a housing is installed outside the light-emitting device. The housing may include a power supply circuit for supplying power to the light-emitting device, a control module for controlling the light-emitting device to turn on and off, and a circuit board with one end connected to the power supply circuit and the other end electrically connected to the light-emitting device. The control module controls the first light-emitting element 1 and the second light-emitting element 2 to turn on or off through the power supply circuit, thereby enabling the light-emitting apparatus to obtain uniform light with a wide wavelength range.

[0061] On the other hand, light-emitting devices can be used in fields such as lighting, beauty, and medicine.

[0062] Note that the above description is merely a preferred embodiment of the present invention and the technical principles employed. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and various obvious changes, readjustments, and substitutions can be made without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments, and may include many other equivalent embodiments without departing from the concept of the present invention. The scope of the present invention is determined by the scope of the appended claims.

Claims

1. A light-emitting device, characterized in that, include: At least one first light-emitting element, at least one second light-emitting element, and a light guide plate; The light guide plate is disposed on the light-emitting surface of the second light-emitting element, and the first light-emitting element is disposed on the side of the light guide plate, with the side of the first light-emitting element close to the light guide plate being the light-emitting surface of the first light-emitting element. The wavelength of the first light-emitting element is different from the wavelength of the second light-emitting element.

2. The light-emitting device according to claim 1, characterized in that, The first light-emitting element is an inorganic light-emitting diode, and the second light-emitting element is an organic light-emitting diode. The wavelength of the first light-emitting element is greater than the wavelength of the second light-emitting element.

3. The light-emitting device according to claim 2, characterized in that, The wavelength of the first light-emitting element is greater than or equal to 760 nm.

4. The light-emitting device according to claim 1, characterized in that, Multiple first light-emitting elements are evenly arranged on the side of the light guide plate, and the light-emitting surfaces of the multiple first light-emitting elements are arranged close to the side of the light guide plate.

5. The light-emitting device according to claim 4, characterized in that, The light-emitting device includes n first light-emitting elements. When n=2, the projections of the light-emitting directions of the two first light-emitting elements onto the light-emitting surface of the light guide plate do not coincide; When n≥3, the projections of the light-emitting directions of the n first light-emitting elements onto the light-emitting surface of the light guide plate intersect each other, and the light-emitting directions of the first light-emitting elements form a closed n-sided polygon inside the light guide plate, wherein the light-emitting surface of the light guide plate is the side of the light guide plate away from the second light-emitting element.

6. The light-emitting device according to claim 4, characterized in that, The light guide plate has a circular or polygonal shape, and the projected area of ​​the light guide plate on the second light-emitting element is smaller than that of the second light-emitting element; the light guide plate also includes a receiving groove disposed on the side edge of the light guide plate, and the first light-emitting element is disposed in the receiving groove.

7. The light-emitting device according to claim 5 or 6, characterized in that, The area of ​​the light guide plate on the side closer to the second light-emitting element is greater than the area of ​​the light guide plate on the side farther away from the second light-emitting element, and the angle between the side of the light guide plate and the light-emitting surface of the second light-emitting element is greater than or equal to 10 degrees and less than or equal to 90 degrees.

8. The light-emitting device according to claim 7, characterized in that, The angle between the side of the light guide plate and the light-emitting surface of the second light-emitting element is greater than or equal to 15 degrees and less than or equal to 75 degrees.

9. The light-emitting device according to claim 1, characterized in that, The light guide plate further includes at least one groove disposed near the side of the second light-emitting element, and / or the light-emitting device further includes a light-scattering layer disposed near the side of the second light-emitting element near the light guide plate.

10. The light-emitting device according to claim 9, characterized in that, The groove, in a cross-section perpendicular to the second light-emitting element, can be at least one of a polygon, a semi-circle, or a semi-ellipse; the groove, in a cross-section parallel to the second light-emitting element, can be at least one of a polygon, a circle, or an ellipse.

11. The light-emitting device according to claim 1, characterized in that, The light guide plate is made of transparent or semi-transparent material, and the average transmittance of the light guide plate in the visible light band and the non-visible light band is greater than 60%; and / or, a light reflection layer is also provided on the side of the light guide plate, and the light reflection layer includes clearance holes that allow the first light-emitting element to pass through.

12. A light-emitting device, characterized in that, It includes the light-emitting device as described in any one of claims 1-11 and a housing for placing the light-emitting device.

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