Light source device and lighting device

Abstract

The embodiment of the utility model provides a light source device which comprises a light-emitting chip, a first wavelength conversion piece, a second wavelength conversion piece and a light guide piece, the light-emitting chip is provided with a light-emitting surface, the light-emitting surface is used for emitting first exciting light and second exciting light, the second wavelength conversion piece can receive the second exciting light emitted by a second area and convert the second exciting light into second excited light, and the light guide piece is used for guiding light emitted by the second area. The second wavelength conversion piece can further receive part of the first excited light emitted by the first wavelength conversion piece and convert the part of the first excited light into second excited light. The two conversion paths of the second excited light can ensure that sufficient second excited light is generated, and deviation of color temperature or color and the like of combined light due to the fact that excessive exciting light is absorbed by the first wavelength conversion piece is avoided. The first excited light, the second excited light and the unconverted exciting light in a proper proportion are beneficial to improving the quality of emergent light of the light source device so as to meet the use requirements of users. The embodiment of the utility model further provides a lighting device.

Description

Technical Field

[0001] The present application relates to the technical field of light source equipment, and in particular to a light source device and a lighting device. Background Art

[0002] The light source device is powered by supplying power to both ends of the light emitting diode (LED) chip, which will project light when powered. With the continuous iteration of light source device technology, white LED light sources are recognized as the fourth generation of lighting, with advantages such as energy saving, environmental protection, long life, and high light efficiency.

[0003] However, the current method of achieving white LED light sources is to encapsulate yellow YAG:Ce phosphors through blue LED chips. With the development of white light technology, the light produced in this way lacks the red light part, and thus the color rendering index of the light is Ra<80. This light source cannot achieve healthy warm white light generation and cannot meet the existing user needs. Utility Model Content

[0004] The embodiments of the present application provide a light source device and a lighting device to at least partially improve the above technical problems.

[0005] In a first aspect, an embodiment of the present application provides a light source device, comprising a light-emitting chip, a first wavelength conversion element, a second wavelength conversion element and a light guide element, wherein the light-emitting chip has a light-emitting surface, the light-emitting surface is used to emit excitation light, the light-emitting surface comprises a first area and a second area, the excitation light emitted from the first area and the second area are respectively the first excitation light and the second excitation light, the first wavelength conversion element is arranged corresponding to the first area, the first wavelength conversion element is used to receive part of the first excitation light emitted from the first area, and convert part of the first excitation light into a first converted light, the second wavelength conversion element is used to receive part of the first converted light and part of the second excitation light emitted from the second area, and convert them into a second converted light, and the light guide element is located on the optical path between the first wavelength conversion element and the second wavelength conversion element, and is used to guide at least part of the first converted light to the second wavelength conversion element.

[0006] In one embodiment, the first area is arranged around the second area.

[0007] In one embodiment, the light guide includes a shell and a reflective layer, the shell includes a first part and a second part, the reflective layer is disposed in the first part and is used to guide the first converted light to the second wavelength conversion element, and the second part is transparent to the first converted light.

[0008] In one embodiment, the second portion is provided with one or more light-transmitting holes.

[0009] In one embodiment, the second wavelength conversion component is disposed on a side of the second portion away from the first portion, and the inner diameter of the second portion gradually decreases from a direction close to the first portion to a direction away from the first portion.

[0010] In one embodiment, the orthographic projection of the second wavelength conversion element on the light-emitting chip covers the second region and a portion of the first region.

[0011] In one embodiment, the light guide is disposed on at least one side of the light emitting chip.

[0012] In one embodiment, the light guide is disposed around the light emitting chip.

[0013] In one embodiment, the first wavelength conversion element is disposed on the surface of the first region.

[0014] In one embodiment, the light source device further includes a light collecting element, which is located in the light path of the output light of the second wavelength converter, and is used to receive the second converted light, the first converted light and the unconverted excitation light and combine them.

[0015] In one embodiment, the first wavelength conversion element includes at least one phosphor layer, which is attached to the light-emitting surface. Each phosphor layer is used to receive the excitation light and emit the first stimulated light of at least one wavelength band.

[0016] In a second aspect, an embodiment of the present application provides a lighting device, comprising the light source device of the first aspect.

[0017] In the light source device and lighting device provided by the embodiments of the present application, the first wavelength conversion element receives the first excitation light emitted from the first area of ​​the light-emitting chip and emits the first stimulated light. The second wavelength conversion element can receive the second excitation light emitted from the second area and convert it into the second stimulated light. The first stimulated light, the second stimulated light and the unconverted excitation light of different wavelength bands are combined to form the emitted light. At the same time, the second wavelength conversion element can also receive part of the first stimulated light emitted by the first wavelength conversion element and convert it into the second stimulated light. The two conversion paths of the second stimulated light can ensure the generation of a sufficient amount of the second stimulated light, avoiding deviations in the color temperature or color of the combined light caused by excessive excitation light being absorbed by the first wavelength conversion element. The first stimulated light, the second stimulated light and the unconverted excitation light with appropriate proportions are conducive to improving the quality of the emitted light of the light source device, so that the display index Ra of the emitted light of the light source device is greater than 80, and the quality of the emitted light is improved to meet the user's usage requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the implementation modes of the present application, the drawings required for use in the description of the implementation modes will be briefly introduced below. Obviously, the drawings described below are only some implementation modes of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0019] Figure 1 A schematic diagram of the structure of a lighting device proposed in an embodiment of the present application;

[0020] Figure 2 A schematic diagram of the structure of a light source device proposed in an embodiment of the present application;

[0021] Figure 3 This is a schematic diagram of the structure of another light source device proposed in an embodiment of the present application.

[0022] Figure numerals: lighting device 1, light source device 100, light emitting chip 10, light emitting surface 11, first area 111, second area 112, first wavelength conversion component 20, phosphor layer 21, second wavelength conversion component 30, light guiding component 40, shell 41, first part 411, second part 412, light-transmitting hole 413, reflective layer 42, adhesive layer 50, light collecting component 60, optical device 200. DETAILED DESCRIPTION

[0023] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the implementation mode of the present application will be clearly and completely described below in conjunction with the drawings in the implementation mode of the present application. Obviously, the described implementation mode is only a part of the implementation mode of the present application, not all the implementation modes. Based on the implementation mode in the present application, all other implementation modes obtained by those skilled in the art without making creative work are within the scope of protection of the present application.

[0024] In this application, unless otherwise clearly specified or limited, the terms "installation", "connection", "fixation" and the like 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 an indirect connection through an intermediate medium, or it can be internal communication between two elements, or it can be only surface contact, or surface contact connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0025] In addition, the terms "first", "second", etc. are only used to distinguish descriptions and cannot be understood as specific or special structures. The descriptions of the terms "some embodiments", "other embodiments", etc. mean that the specific features, structures, materials or characteristics described in conjunction with the embodiments or examples are included in at least one embodiment or example of the present application. In the present application, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine the different embodiments or examples described in the present application and the features of the different embodiments or examples without contradiction.

[0026] Example

[0027] The present application embodiment provides a lighting device 1, see Figure 1 The lighting device 1 can be applied to automobile lighting, medical equipment lighting, building lighting, projectors, etc., and this embodiment does not limit this. In order to describe the lighting device 1 more specifically, the following content describes the lighting device 1 applied to automobile lighting.

[0028] The lighting device 1 can be set as a running light of a car (not shown in the figure), which is suitable for driving lighting of the car. The lighting device 1 can be installed in the body of the car, and the body can be a collection of a frame and a cover. More specifically, the lighting device 1 may include a light source device 100 and an optical device 200 including but not limited to a lens, a polarizer, a filter, a diaphragm, etc. The light source device 100 emits illumination light, and the optical device 200 adjusts the illumination light and emits it to the outside. In a dark environment, the lighting device 1 can illuminate the surrounding driving environment and improve the driving safety of the driver and passengers.

[0029] See also Figure 2 The light source device 100 may include a light emitting chip 10, a first wavelength conversion member 20, a second wavelength conversion member 30 and a light guide member 40, wherein the light guide member 40 is connected between the light emitting chip 10 and the second wavelength conversion member 30, and the first wavelength conversion member 20 is disposed between the light emitting chip 10 and the second wavelength conversion member 30.

[0030] It is understandable that the light source device 100 of this embodiment can be applied to household lighting, medical lighting, automotive lighting, etc., and this implementation is not limited thereto.

[0031] Please continue reading Figure 2 The light emitting chip 10 has a light emitting surface 11, and the light emitting surface 11 is used to emit excitation light. The excitation light can be emitted along a first direction (such as Figure 2The light emitting chip 10 may be a light emitting diode (LED) chip or a laser chip, etc., and an LED chip is used as an example for introduction. The LED chip can generate fluorescence when powered on. Based on the difference in the emitted light, the light emitting chip 10 may be a blue light LED chip, a near-ultraviolet LED chip, a purple light LED chip, etc., which are not enumerated in this embodiment. Exemplarily, the light emitting chip 10 may be a blue light LED chip, and its emitted light is the corresponding blue excitation light, and the wavelength range of the excitation light may be 445nm-455nm. Alternatively, the light emitting chip 10 may be a near-ultraviolet LED chip, and its emitted light is the corresponding ultraviolet light, and the wavelength range of the excitation light may be 365nm-370nm.

[0032] For more details, please refer to Figure 2 , the light-emitting surface 11 may include a first area 111 and a second area 112, and the excitation light may be emitted simultaneously from the first area 111 and the second area 112. Among them, the excitation light emitted from the first area 111 and the second area 112 are the first excitation light and the second excitation light, respectively. This embodiment does not limit the area ratio, relative position, shape, etc. between the first area 111 and the second area 112. Exemplarily, the first area 111 may be arranged around the second area 112. Furthermore, the first area 111 is configured as a ring structure, and the second area 112 is located in the first area 111. This embodiment can emit multiple excitation lights through multiple areas of the light-emitting surface 11, and use multiple excitation lights to complete different excitation tasks, which is convenient for precise control of the subsequent optical path.

[0033] In another embodiment, the number of the light emitting chips 10 can be configured as one or more, such as 1, 2, 3, etc., which is not limited in this embodiment. The type or number of the light emitting chips 10 can be selected according to the actual needs of the light source device 100, which is not limited in this embodiment. In addition, multiple light emitting chips 10 can be simultaneously arranged on a light source device 100 and emit light in the same direction. By increasing the number of light emitting chips 10 to increase the intensity of the excitation light, the brightness of the light can be guaranteed and the direction of the light path can be determined.

[0034] In another embodiment, a substrate (not shown in the figure) may be provided on the surface of the light emitting chip 10 away from the second wavelength conversion element 30. The substrate may be a copper plate, an aluminum plate, etc., which has an efficient heat dissipation effect. A metal heat sink may be provided in the light emitting chip 10, and the metal heat sink and the substrate may be mutually heat-conducted to reduce the heat in the light emitting chip 10 and ensure the safety of the light emitting chip 10. At the same time, a circuit may be arranged on the substrate, and the circuit is used to transmit power and / or control signals to the light emitting chip 10, which is not limited in this embodiment.

[0035] In this embodiment, the first wavelength conversion element 20 is arranged corresponding to the first area 111, and the first area 111 emits the first excitation light. The first wavelength conversion element 20 is used to receive part of the first excitation light emitted from the first area 111, and convert part of the first excitation light into the first converted light. The type and structure of the first wavelength conversion element 20 are configured according to the type of the excitation light, thereby changing the type and wavelength band of the first converted light. For example, the first excitation light is blue light, and under the influence of the specific type and structure of the first wavelength conversion element 20, the first converted light can be green light, orange light, yellow light, and a combination thereof. Alternatively, the first excitation light is near-ultraviolet light, and under the influence of the specific type and structure of the first wavelength conversion element 20, the first converted light can be green light, blue light, and a combination thereof.

[0036] The first wavelength conversion element 20 can be disposed on the surface of the first region 111, and the first excitation light is directly emitted from the light-emitting surface 11 of the light-emitting chip 10 to the first wavelength conversion element 20, so as to avoid the first excitation light from being refracted or scattered during the propagation process, reduce the loss of the first excitation light during the propagation process, and improve the energy utilization rate of the first excitation light. This configuration can also reduce the volume of the light source device 100 and improve its scope of application.

[0037] In another embodiment, the light-emitting chip 10 generates a large amount of heat during operation. In order to reduce the impact of high temperature on the conversion efficiency of the first wavelength converter 20, the light-emitting chip 10 in this embodiment can be spaced apart from the first wavelength converter 20. The gap between the light-emitting chip 10 and the first wavelength converter 20 can reduce the heat transfer efficiency, reduce the heat transferred from the light-emitting chip 10 to the first wavelength converter 20, and avoid high temperature affecting the conversion efficiency of the first wavelength converter 20.

[0038] In this example, please continue to refer to Figure 2, the first wavelength conversion element 20 may include at least one phosphor layer 21, the phosphor layer 21 may be configured with phosphor particles for fluorescence conversion (not shown in the figure), and the number of phosphor layers 21 may be 1, 2, 3, ..., or even more, and the present embodiment does not limit the number of phosphor layers 21. Multiple phosphor layers 21 may be configured with the same or different phosphor particles, and multiple phosphor layers 21 may be stacked, spliced, etc., and there is no restriction on their specific types and placement methods, which are selected and designed according to subsequent use requirements. The phosphor layer 21 is attached to the light-emitting surface 11, and the connection method between the phosphor layer 21 and the light-emitting surface 11 may be bonding, connection with a fixing member, etc. For example, the light source device 100 may be configured with an adhesive layer 50, and the adhesive layer 50 may be configured as a silicone layer, etc., and the silicone layer has characteristics such as high thermal conductivity efficiency. The adhesive layer 50 may be bonded between the phosphor layer 21 and the light-emitting surface 11, so that the phosphor layer 21 and the light-emitting chip 10 are designed as an integrated whole. The phosphor layer 21 receives part of the first excitation light emitted from the first area 111 of the light-emitting surface 11, and emits the first converted light. The phosphor layer 21 may be configured with a ceramic substrate with high thermal conductivity. While receiving the first excitation light and converting it into the first converted light, the phosphor layer 21 may also transfer the surface heat of the light-emitting chip 10 and transfer it to the environment, thereby reducing the temperature of the light-emitting chip 10 and protecting the normal use of the light-emitting chip 10.

[0039] For more details, please refer to Figure 2 , each phosphor layer 21 is used to receive the first excitation light and emit the first converted light of at least one wavelength band. When the number of phosphor layers 21 is single, the phosphor layer 21 receives the first excitation light and emits the first converted light of one wavelength band, and the first converted light can be green light, orange light, yellow light, blue light, etc. When the number of phosphor layers 21 is multiple, the phosphor layer 21 receives the first excitation light and emits the first converted light of one or more wavelength bands, and the first converted light can be green light, orange light, yellow light, blue light, etc. or a combination thereof. By adjusting the type and structure of the phosphor layer 21, the first converted light of different wavelength bands can be obtained, and then adapted to its subsequent optical path.

[0040] In one embodiment, the first excitation light is blue light, and the phosphor layer 21 can be configured as a yellow phosphor layer, which can be configured as a YAG:Ce phosphor layer or a Sr2S iO4:Eu phosphor layer or a Li2SrS iO4:Eu phosphor layer or a Ca2BO3C l:Eu phosphor layer or a La3S i6N 11 :Ce phosphor layer or Ca2S iO4:Ce phosphor layer or a combination thereof, preferably a YAG:Ce phosphor layer, and the first converted light can be yellow light.

[0041] In another embodiment, the first excitation light is blue light, the first converted light can be configured as green light, and the phosphor layer 21 can be configured as MN2S4:Eu (M=Ba, Sr, Ca; N=Al, Ga, In) sulfate system phosphor layer or MNPO4:Tb (M=Li, Na; N=Sr, Ca) phosphate system phosphor layer or LuAG:Ce aluminate system phosphor layer or β-SiAlON:Eu nitride system phosphor layer or A3La(BO)3:Tb borate system phosphor layer or a combination thereof, preferably LuAG:Ce aluminate system phosphor layer or a combination thereof.

[0042] In another embodiment, the first excitation light is blue light, the first stimulation light can be configured as orange light, and further, the phosphor layer 21 can be configured as α-SiAlON:Eu phosphor layer or YAG:Eu phosphor layer or CaAlSiN3:Eu phosphor layer or (Ca,Sr,Ba)2Si5N8:Eu phosphor layer or K2SiF6:Mn phosphor or a combination thereof.

[0043] In another embodiment, the light emitting chip 10 is configured as a near-ultraviolet LED chip, the first excitation light is ultraviolet light, the first stimulated light can be configured as blue light, and then the phosphor layer 21 can be configured as a SiAl4O2N4:Eu phosphor layer or a Y5Si3O 12 N:Ce phosphor layer or Sr5(PO4)3C l:Eu phosphor layer or BaMgAl 10 O 17 :Eu phosphor layer or RbBaPO4:Eu blue phosphor β-SiAlON:Eu phosphor layer or Ca-α-SiAlON:Ce, Li green phosphor or a combination thereof.

[0044] In another embodiment, the light emitting chip 10 is configured as a near-ultraviolet LED chip, the first excitation light is ultraviolet light, the first converted light can be configured as green light, and further, the phosphor layer 21 can be configured as a β-SiAlON:Eu phosphor layer or a Ca-α-SiAlON:Ce, Li phosphor layer or a combination thereof.

[0045] In this example, please continue to refer to Figure 2, the second wavelength conversion element 30 may be located in the optical path of at least part of the first converted light and part of the second excitation light emitted from the second area 112. The second wavelength conversion element 30 may be used to receive part of the second excitation light emitted from the second area 112 and part of the first converted light emitted by the first wavelength conversion element 20, and convert them into second converted light. The second converted light may be red light, and its corresponding wavelength range may be 625nm-740nm. The second wavelength conversion element 30 may receive part of the second excitation light emitted from the second area 112 and convert it into the second converted light, while also receiving part of the first converted light and converting it into the second converted light. The second wavelength conversion element 30 may form the second converted light in two ways, namely, ensuring that the second wavelength conversion element 30 may generate enough second converted light. The second converted light and the first converted light are combined to form a full-spectrum output light to ensure the display index of the output light.

[0046] It is understandable that in this embodiment, the proportion of the excitation light obtained by the first wavelength conversion element 20 and the second wavelength conversion element 30 can be changed by adjusting the area proportion of the first area 111 and the second area 112 in the light-emitting surface 11. For example, the larger the area proportion of the first area 111, the smaller the area proportion of the second area 112. Under the premise that the total amount of excitation light emitted by the light-emitting chip 10 remains unchanged, the more first excitation light is received by the first wavelength conversion element 20, and the less second excitation light is received by the second wavelength conversion element 30. Furthermore, the amount of the first excitation light and the second excitation light can be changed by adjusting the area proportion of different areas of the light-emitting surface 11 to adjust the optical parameters such as the color temperature of the emitted light of the light source device 100.

[0047] In one embodiment, please refer to Figure 2 , the orthographic projection of the second wavelength conversion element 30 on the light emitting chip 10 covers the second area 112 and part of the first area 111. The second excitation light emitted from the second area 112 can be directly transmitted to the second wavelength conversion element 30. At the same time, the orthographic projection of the second wavelength conversion element 30 on the light emitting chip 10 covers part of the first area 111, and the first wavelength conversion element 20 disposed in the first area 111 can directly emit the first converted light to the second wavelength conversion element 30. The second wavelength conversion element 30 can directly obtain part of the first converted light and the second excitation light. The arrangement of the second wavelength conversion element 30 on the light emitting chip 10 covering the second area 112 and part of the first area 111 can simplify the optical path of the second excitation light, reduce the loss of the second excitation light, and ensure that the second wavelength conversion element 30 can convert enough second converted light.

[0048] In this embodiment, the second wavelength conversion element 30 may also include at least one phosphor layer. To distinguish it from the phosphor layer 21 of the first wavelength conversion element 20, the phosphor layer of the second wavelength conversion element 30 is referred to as the second phosphor layer in the following description. The second phosphor layer may be configured with phosphor particles for fluorescence conversion (not shown in the figure), and the number of second phosphor layers may be 1, 2, 3, ..., or even more. This embodiment does not limit the number of second phosphor layers. Multiple second phosphor layers may be configured with the same or different phosphor particles, and multiple second phosphor layers may be stacked, spliced, etc. There is no restriction on their specific types and placement methods, and they are selected and designed according to subsequent use requirements. The second wavelength conversion element 30 may also be provided with an adhesive layer for bonding the second phosphor layer. The adhesive layer may be configured as an epoxy resin layer, etc.

[0049] In one embodiment, the second excitation light is blue light, the second stimulation light can be configured as red light, and the second phosphor layer can be configured as a red phosphor layer, such as a CaAl SiN3:Eu phosphor layer,

[0050] (Ca, Sr, Ba)2Si5N8:Eu phosphor layer, K2Si F6:Mn phosphor layer, Sr4Al 14 O 25 :Mn phosphor layer, CaO:Eu phosphor layer or a combination thereof.

[0051] In another embodiment, the second excitation light is near ultraviolet light, the second stimulation light can be configured as red light, and the second phosphor layer can be configured as a red phosphor layer, such as LiSr4B3O (9-3X / 2) N x :Eu phosphor layer, CaAl Si N3:Eu phosphor layer, Sr2Si5N8:Eu phosphor layer or a combination thereof.

[0052] In this embodiment, in order to ensure that the first converted light is fully utilized, the light guide 40 is used to guide at least part of the first converted light to the second wavelength conversion element 30. The light guide 40 can be configured in the shape of a sheet, a cone, a prism, a frustum, etc., which is not limited in this embodiment. The light guide 40 is located on the optical path between the first wavelength conversion element 20 and the second wavelength conversion element 30. Except for the loss caused by the propagation of the first converted light, part of the first converted light can be directly obtained by the second wavelength conversion element 30, and the remaining part can be emitted into the light guide 40 and guided to the second wavelength conversion element 30 through the light guide 40, so that at least part of it can be used by the second wavelength conversion element 30. By guiding the first converted light through the light guide 40, the loss of the first converted light is reduced, and the utilization rate of the first converted light is improved.

[0053] In this embodiment, please continue to refer to Figure 2, the light guide 40 is disposed on at least one side of the light emitting chip 10. In other words, the light emitting chip 10 may include a side surface adjacent to the light emitting surface 11, and the light guide 40 is disposed on the side surface of the light emitting chip 10. Further, the light guide 40 is disposed around the light emitting chip 10, that is, the light guide 40 may be disposed on the peripheral side of the light emitting chip 10. When the excitation light emitted by the light emitting chip 10 is dispersed and propagated in all directions, the light guide 40 may guide the excitation light dispersed and propagated in all directions to the first wavelength conversion element 20 or the second wavelength conversion element 30. In this embodiment, by disposing the light guide 40 on at least one side of the light emitting chip 10, the first wavelength conversion element 20 and the second wavelength conversion element 30 can absorb more excitation light, ensure that the excitation light is converted into sufficient first converted light and second converted light, and improve energy utilization.

[0054] In a more specific embodiment, the light guide 40 includes a shell 41 and a reflective layer 42. The reflective layer 42 can receive the first converted light, and the first converted light is reflected to the second wavelength conversion member 30 through the reflective layer 42. The shell 41 can be arranged outside the reflective layer 42, and the shell 41 can ensure the structural strength of the reflective layer 42. Further, the reflective layer 42 can be arranged on the inner wall of the shell 41, and the reflective layer 42 can be integrated with the shell 41 by electroplating or the like. The shell 41 can be set to a metal material, such as copper, steel, etc., which has high strength and other characteristics. The shell 41 also has high thermal conductivity and other characteristics. The shell 41 can transfer the heat of the reflective layer 42 and dissipate the heat to the environment. It can transfer the heat of the first converted light absorbed by the reflective layer 42, effectively reduce the temperature of the reflective layer 42, and ensure its safety in use.

[0055] See also Figure 3 The housing 41 includes a first portion 411 and a second portion 412, which may be connected to each other and may be distributed along the optical path of the excitation light. The reflective layer 42 is disposed on the first portion 411 and is used to guide the first converted light to the second wavelength conversion member 30. The second wavelength conversion member 30 may be disposed on a side of the second portion 412 away from the first portion 411, and the second wavelength conversion member 30 may receive part of the first converted light. The second portion 412 may transmit the first converted light. Further, the second portion 412 may be configured as a light-transmitting structure, including but not limited to a light-transmitting member, a light-transmitting hole, etc. The first converted light may be emitted to the outside of the light guide member 40 through the second portion 412, and combined with the second converted light to form the exit light of the light source device 100. The second portion 412 may prevent the first converted light from being excessively absorbed by the second wavelength conversion member 30, and ensure that sufficient first converted light and second converted light are mixed to form the exit light of the light source device 100, so as to ensure the display index of the exit light.

[0056] In one embodiment, see Figure 3The second part 412 is provided with one or more light-transmitting holes 413, and the number of light-transmitting holes 413 can be 1, 2, 3..., or even more, which is not limited in this embodiment. The axial extension line of the light-transmitting hole 413 intersects with the first region 111, and part of the first converted light emitted from the first wavelength conversion component 20 can be directly emitted to the outside of the light guide 40 through the light-transmitting hole 413, and / or, the light-transmitting hole 413 can be arranged on the peripheral side of the second wavelength conversion component 30, and part of the first converted light guided by the first part 411 can also be emitted to the light-transmitting hole 413. This arrangement can ensure that enough first converted light is emitted to the outside of the light guide 40, thereby ensuring the light-combining effect of the first converted light and the second converted light.

[0057] It is understandable that the number and size of the light-transmitting holes 413 affect the number of first converted light, and thus can change the optical parameters such as the color temperature of the output light of the subsequent light source device 100. Exemplarily, the more the number and the larger the size of the light-transmitting holes 413, the more first converted light is emitted outside the light guide 40. And when the color temperature of the first converted light is higher than the color temperature of the second converted light, more first converted light can increase the color temperature of the output light of the light source device 100.

[0058] Preferably, the excitation light can be configured as blue light, and the blue light is directly emitted from the light-transmitting hole 413 to the outside of the light source device 100, which may cause certain safety hazards. In order to prevent the excitation light from being directly emitted to the outside of the environment, the second part 412 of this embodiment is staggered with the second area 112, that is, the second excitation light emitted from the second area 112 cannot be directly emitted to the outside of the light source device 100 through the second part 412. In addition, the first excitation light emitted from the first area 111 has been absorbed by the first wavelength conversion component 20 or guided by the first part 411 to the second wavelength conversion component 30, and cannot be directly transmitted to the light-transmitting hole 413. This configuration can prevent the excitation light from being directly emitted, thereby improving the safety of the light source device 100.

[0059] In one embodiment, the inner diameter of the second portion 412 is from the direction close to the first portion 411 to the direction away from the first portion 411 (the direction is Figure 2 In other words, the second portion 412 can be configured as a conical structure, a truncated cone structure, a hemispherical structure, or other irregular structures. In the direction from the first portion 411 to and away from the first portion 411, the inner diameter of the second portion 412 gradually decreases, which helps to better focus part of the light and guide it to the second wavelength conversion member 30.

[0060] In this example, please refer to Figure 2The light source device 100 further includes a light collecting element 60, which may be a light rod or the like. The light collecting element 60 is located in the optical path of the outgoing light of the second wavelength conversion element 30, and is used to receive the second converted light, the first converted light, and the unconverted excitation light and combine the light. The unconverted excitation light may be part of the first excitation light or part of the second excitation light or a combination of the two. The second converted light, the first converted light, and the unconverted excitation light may be reflected multiple times in the light collecting element 60, thereby enhancing the uniformity of the outgoing light of the light collecting element 60 without losing light intensity, thereby ensuring the light output quality of the light source device 100.

[0061] In one embodiment, the light guide 40 is provided with a second portion 412 for transmitting the first converted light, and the light collecting member 60 may be provided corresponding to the second portion 412. The light collecting member 60 is located in the optical path of the outgoing light of the second wavelength conversion member 30, and it may also be located in the optical path of the outgoing light of the second portion 412. The light collecting member 60 may simultaneously obtain the first converted light emitted from the second portion 412 and the outgoing photosynthetic light emitted from the second wavelength conversion member 30, thereby ensuring that there are sufficient first converted light and second converted light and unconverted excitation photosynthetic light, thereby improving the color rendering index of the outgoing light of the light source device 100.

[0062] For ease of understanding, specific embodiments are provided below.

[0063] First embodiment

[0064] The light-emitting chip 10 uses a ln GaN blue light chip, and the wavelength of its excitation light is 445nm. The phosphor and epoxy resin are mixed in a mass ratio of 10:1, and then ground and coated on the blue chip to form a first wavelength conversion element 20. The thickness of the first wavelength conversion element 20 is 30um. The first wavelength conversion element 20 includes YAG:Ce yellow phosphor and LuAG:Ce green phosphor. The emission spectrum peak wavelength of YAG:Ce yellow phosphor is 560nm-570nm, and the half-peak width is 60nm-80nm. The emission spectrum peak wavelength of LuAG:Ce green phosphor is 520-540nm, and the half-peak width is 40nm-65nm. The second wavelength conversion element 30 is formed by mixing CaAlS iN3:Eu red phosphor with epoxy resin, and its emission spectrum peak wavelength is 650nm-660nm, and the half-peak width is 80nm-100nm. According to the test, the display index Ra of the emitted light of the light source device 100 of the present embodiment is greater than 80, which meets the use requirements of the users.

[0065] Second embodiment

[0066] The light-emitting chip 10 uses a near-ultraviolet chip, and the wavelength of its excitation light is 365nm. The phosphor and epoxy resin are mixed in a mass ratio of 10:1, and then ground and coated on the blue chip to form a first wavelength conversion element 20. The thickness of the first wavelength conversion element 20 is 30um. The first wavelength conversion element 20 includes Sr5(PO4)3C l blue phosphor and β-SiAlON:Eu green phosphor. The emission spectrum peak wavelength of Sr5(PO4)3C l blue phosphor is nm, and the half-peak width is 60nm-80nm. The emission spectrum peak wavelength of β-SiAlON:Eu green phosphor is nm, and the half-peak width is 40nm-65nm. The second wavelength conversion element 30 is formed by mixing CaAl Si N3:Eu red phosphor with epoxy resin, and its emission spectrum peak wavelength is 650-660nm, and the half-peak width is 80nm-100nm. According to the test, the display index Ra of the emitted light of the light source device 100 of the present embodiment is greater than 80, which meets the use requirements of the users.

[0067] Third embodiment

[0068] The light-emitting chip 10 uses a ln GaN blue light chip, and the wavelength of its excitation light is 445nm. A transparent resin is applied on the blue light chip, and the first wavelength conversion component 20 is glued to the blue chip. The thickness of the first wavelength conversion component 20 is 100um. The first wavelength conversion component 20 includes LuAG:Ce green fluorescent ceramics, and its emission spectrum peak wavelength is 520nm-530nm. The second wavelength conversion component 30 is formed by mixing CaAl SiN3:Eu red phosphor and epoxy resin, and its emission spectrum peak wavelength is 650-660nm. After testing, the display index Ra of the output light of the light source device 100 of this embodiment is greater than 80, which meets the user's usage requirements.

[0069] In this embodiment, the first wavelength conversion element 20 and the second phosphor layer 21 are LuAG:Ce green fluorescent ceramics, which can achieve high current excitation and improve the lighting power of the light source device 100 .

[0070] In the light source device 100 and the lighting device 1 provided in this embodiment, the first wavelength conversion element 20 receives the first excitation light emitted from the first area 111 of the light-emitting chip 10 and emits the first converted light. The second wavelength conversion element 30 can receive the second excitation light emitted from the second area 112 and convert it into the second converted light. The first converted light, the second converted light and the unconverted excitation light of different wavelength bands are combined to form the output light. At the same time, the second wavelength conversion element 30 can also receive part of the first converted light emitted by the first wavelength conversion element 20 and convert it into the second converted light. The two conversion paths of the second converted light can ensure the generation of a sufficient amount of the second converted light, and avoid the deviation of the color temperature or color of the combined light caused by excessive excitation light being absorbed by the first wavelength conversion element 20. The first converted light, the second converted light and the unconverted excitation light with appropriate proportions are conducive to improving the quality of the output light of the light source device 100, so that the display index Ra of the output light of the light source device 100 is greater than 80, and the quality of the output light is improved to meet the user's use requirements.

[0071] The above implementation modes are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned implementation modes, a person skilled in the art should understand that the technical solutions described in the aforementioned implementation modes can still be modified, or some of the technical features can be replaced by equivalents. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various implementation modes of the present application, and should all be included in the protection scope of the present application.

Claims

1. A light source device, characterized in that: include: A light-emitting chip, wherein the light-emitting chip has a light-emitting surface, the light-emitting surface is used to emit excitation light, the light-emitting surface includes a first area and a second area, and the excitation light emitted from the first area and the second area are respectively first excitation light and second excitation light; a first wavelength conversion element, the first wavelength conversion element being disposed corresponding to the first region, and being used for receiving a portion of the first excitation light emitted from the first region and converting the portion of the first excitation light into a first converted light; a second wavelength conversion element, the second wavelength conversion element being used to receive part of the first converted light and part of the second excitation light emitted from the second region, and convert the received light into a second converted light; as well as A light guide is located on an optical path between the first wavelength conversion element and the second wavelength conversion element, and is used to guide at least a portion of the first converted light to the second wavelength conversion element.

2. The light source device according to claim 1, characterized in that: The first area is arranged around the second area.

3. The light source device according to claim 2, characterized in that: The light guide includes a housing and a reflective layer. The housing includes a first portion and a second portion. The reflective layer is disposed on the first portion and is used to guide the first converted light to the second wavelength conversion element. The second portion is transparent to the first converted light.

4. The light source device according to claim 3, characterized in that: The second part is provided with one or more light-transmitting holes.

5. The light source device according to claim 3, characterized in that: The second wavelength conversion component is disposed on a side of the second portion away from the first portion, and an inner diameter of the second portion gradually decreases from a direction close to the first portion to a direction away from the first portion.

6. The light source device according to claim 1, characterized in that: The second wavelength conversion element covers the second area and a portion of the first area on the orthographic projection of the light emitting chip.

7. The light source device according to claim 1, characterized in that: The light guide is disposed on at least one side of the light emitting chip.

8. The light source device according to claim 7, characterized in that: The light guiding member is arranged around the light emitting chip.

9. The light source device according to claim 1, characterized in that: The first wavelength conversion element is disposed on a surface of the first region.

10. The light source device according to claim 1, characterized in that: The light source device further includes a light collecting element, which is located in the optical path of the outgoing light of the second wavelength conversion element, and is used for receiving the second converted light, the first converted light and the unconverted excitation light and combining them.

11. The light source device according to any one of claims 1 to 10, characterized in that: The first wavelength conversion element includes at least one phosphor layer, and the phosphor layer is attached to the light-emitting surface. Each of the phosphor layers is used to receive the excitation light and emit the first stimulated light of at least one wavelength band.

12. A lighting device, characterized in that: include: A light source device as claimed in any one of claims 1 to 11.

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