Light source module and lighting device

Abstract

The utility model relates to a light source module and a lighting device. The light source module comprises a light source, a first wavelength conversion device and a second wavelength conversion device. The light source is used for emitting exciting light, and the first wavelength conversion device is arranged on a light path of the exciting light and used for generating first fluorescent light under excitation of part of the exciting light. The second wavelength conversion device is arranged on a light path of the first fluorescence and used for generating second fluorescence under excitation of part of the first fluorescence, the wavelength of the first fluorescence is smaller than that of the second fluorescence, the second fluorescence and part of the first fluorescence are mixed to form emergent light, and the second wavelength conversion device at least comprises a red fluorescence layer; the second fluorescence at least comprises red fluorescence. The red fluorescent light of the light source module is generated by exciting the red fluorescent layer by the first fluorescent light, so that the problem of thermal attenuation of the red fluorescent layer caused by direct excitation of exciting light is avoided, and the application stability of the red fluorescent layer is improved.

Description

Technical Field

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

[0002] White light laser lighting device is a lighting device that uses laser as a light source and generates white light by converting or mixing lasers of different wavelengths through a fluorescent layer.

[0003] Traditional laser lighting devices usually use blue light to excite yellow fluorescent materials to obtain yellow fluorescence, which together with the unabsorbed blue light constitutes white light. In the actual application of laser lighting sources, it is necessary to add a red fluorescent layer with high stability to improve the color rendering index of the lighting device. However, the red fluorescent layer has stability problems during long-term use, and the red fluorescent layer is prone to thermal quenching under high-power laser irradiation. Utility Model Content

[0004] Embodiments of the present application provide a light source module and a lighting device.

[0005] In a first aspect, an embodiment of the present application provides a light source module, including a light source, a first wavelength conversion device, and a second wavelength conversion device. The light source is used to emit excitation light, the first wavelength conversion device is arranged on the optical path of the excitation light, and is used to generate a first fluorescence under the excitation of part of the excitation light. The second wavelength conversion device is arranged on the optical path of the first fluorescence, and is used to generate a second fluorescence under the excitation of part of the first fluorescence, the wavelength of the first fluorescence is smaller than the wavelength of the second fluorescence, and the second fluorescence and part of the first fluorescence are mixed to form an outgoing light, wherein the second wavelength conversion device at least includes a red fluorescent layer, and the second fluorescent includes at least red fluorescent.

[0006] In some optional embodiments, the first wavelength conversion device includes a first fluorescent layer, the first fluorescent layer includes a first sub-fluorescent layer and a second sub-fluorescent layer, the first sub-fluorescent layer and the second sub-fluorescent layer are excited to generate a first sub-fluorescence and a second sub-fluorescence respectively, the wavelength of the first sub-fluorescence and the wavelength of the second sub-fluorescence are different, and the wavelength of the first sub-fluorescence and the wavelength of the second sub-fluorescence are both smaller than the wavelength of the red fluorescence.

[0007] In some optional embodiments, the light source includes a first light source and a second light source, the first light source excites the first sub-fluorescent layer, and the second light source excites the second sub-fluorescent layer; wherein the first light source is an ultraviolet light source, and the first sub-fluorescent layer is a blue fluorescent layer; the second light source is an ultraviolet light source or a blue light source, and the second sub-fluorescent layer is a yellow fluorescent layer and / or a green fluorescent layer.

[0008] In some optional embodiments, the light source module also includes a shell and a selection membrane, the shell includes a first cavity and a second cavity that are connected, the first wavelength conversion device is arranged in the first cavity, and the second wavelength conversion device is arranged in the second cavity; the selection membrane is arranged in the shell and separates the first cavity and the second cavity, and the selection membrane is used to reflect the excitation light and transmit the first fluorescence.

[0009] In some optional embodiments, the first cavity includes a first sub-cavity and a second sub-cavity, the first sub-fluorescent layer is disposed on a side wall of the first sub-cavity, and the second sub-fluorescent layer is disposed on a side wall of the second sub-cavity.

[0010] In some optional embodiments, the first wavelength conversion device also includes a first reflective layer, the first reflective layer includes a first sub-reflective layer and a second sub-reflective layer, the first sub-reflective layer is arranged between the side wall of the first sub-cavity and the first sub-fluorescent layer, and the second sub-reflective layer is arranged between the side wall of the second sub-cavity and the second sub-fluorescent layer.

[0011] In some optional embodiments, the shell is provided with a light incident side, which is arranged on a side of the first cavity away from the second cavity; the light source module also includes a light-transmitting substrate, which is arranged between the light incident side and the light source.

[0012] In some optional embodiments, the shell is provided with a light emitting side, which is arranged on a side of the second cavity away from the first cavity, and the light source module further includes a lens, which is arranged on the light emitting side.

[0013] In some optional embodiments, the second wavelength conversion device further includes a second reflective layer, the second reflective layer is disposed on the inner wall of the second cavity, the red fluorescent layer is disposed on the second reflective layer, and the second reflective layer is used to reflect the second fluorescence to the light output side.

[0014] In some optional embodiments, the light source module further includes a third reflective layer, which is disposed at an edge of the light emitting side, and is used to reflect part of the first fluorescent light to the second wavelength conversion device.

[0015] In some optional embodiments, the light source module further includes a cooling device, the shell further includes a third cavity, the third cavity is adjacent to the second cavity, the cooling device is arranged in the third cavity, and the cooling device is used to cool the second wavelength conversion device.

[0016] In a second aspect, an embodiment of the present application further provides a lighting device, comprising the above-mentioned light source module.

[0017] Compared with the prior art, when the light source module provided in the embodiment of the present application is used, the light source emits an excitation light, the excitation light propagates to the first wavelength conversion device, the first wavelength conversion device is excited to generate a first fluorescence, the first fluorescence propagates to the second wavelength conversion device, and part of the first fluorescence excites the second wavelength conversion device to generate a second fluorescence. The second fluorescence and part of the first fluorescence are mixed to form the output light. The second wavelength conversion device includes at least a red fluorescence layer, and the second fluorescence includes at least red fluorescence. The red fluorescence increases the color rendering index of the output light. The red fluorescence is generated by the first fluorescence exciting the red fluorescence layer, which avoids the problem of thermal attenuation of the red fluorescence layer directly excited by the excitation light, and improves the application stability of the red fluorescence layer. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solution of the present application, the drawings required for use in the implementation manner will be briefly introduced below. Obviously, the drawings described below are only some implementation manners of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0019] Figure 1 This is a module block diagram of a lighting device provided in one embodiment of the present application.

[0020] Figure 2 It is a simplified structural diagram of a light source module provided in one embodiment of the present application.

[0021] Figure 3 yes Figure 2 A simplified structural diagram of an implementation of a first wavelength conversion device of a light source module is shown.

[0022] Figure 4 yes Figure 2 A simplified structural diagram of another embodiment of the first wavelength conversion device of the light source module is shown.

[0023] Figure 5 yes Figure 2 A simplified structural diagram of an implementation of a light source module is shown.

[0024] Explanation of reference numerals: 100, light source module; 10, light source; 20, cooling device; 30, first wavelength conversion device; 32, substrate; 321, first reflection layer; 323, first sub-reflection layer; 325, second sub-reflection layer; 33, first fluorescent layer; 34, first sub-fluorescent layer; 36, second sub-fluorescent layer; 38, third reflection layer; 50, second wavelength conversion device; 52, second reflection layer; 521, reflection surface; 54, third reflection layer; 70, shell; 71, light incident side; 73, light exit side; 72, first cavity; 721, first sub-cavity; 723, second sub-cavity; 74, second cavity; 741, bottom wall; 76, third cavity; 80, selection film; 90, light-transmitting substrate; 110, lens; 200, lighting device; 201, circuit board. DETAILED DESCRIPTION

[0025] In order to enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without making creative work are within the scope of protection of the present application.

[0026] If certain words are used in the specification and claims to refer to specific components, those skilled in the art should understand that hardware manufacturers may use different terms to refer to the same component. The specification and claims do not use differences in names as a way to distinguish components, but use differences in components' functions as the criteria for distinction. For example, "including" mentioned throughout the specification and claims is an open term, so it should be interpreted as "including but not limited to"; "substantially" means that those skilled in the art can solve technical problems within a certain error range and basically achieve technical effects.

[0027] See also Figure 1 The embodiment of the present application provides a light source module 100 and a lighting device 200. The light source module 100 can be applied to the lighting device 200 to provide lighting with a high color rendering index.

[0028] This specification does not limit the specific type of the lighting device 200. For example, the lighting device 200 can be a stage light, a car light, a searchlight, etc. As an example, the lighting device 200 can include the above-mentioned light source module 100 and a circuit board 201. The circuit board 201 is electrically connected to the light source module 100 and is used to supply energy to the light source module 100.

[0029] See also Figure 2In this embodiment, the light source module 100 may include a light source 10, a first wavelength conversion device 30, and a second wavelength conversion device 50. The light source 10 is used to emit excitation light P, and the first wavelength conversion device 30 is arranged on the optical path of the excitation light P, and is used to generate a first fluorescence A under the excitation of part of the excitation light P. The second wavelength conversion device 50 is arranged on the optical path of the first fluorescence A, and is used to generate a second fluorescence B under the excitation of part of the first fluorescence A. The wavelength of the first fluorescence A is smaller than the wavelength of the second fluorescence B, and the second fluorescence B and part of the first fluorescence A are mixed to form the output light. Among them, the second wavelength conversion device 50 includes at least a red fluorescent layer, and the second fluorescence B includes at least red fluorescence.

[0030] When in use, the light source 10 emits an excitation light P, part of which propagates to the first wavelength conversion device 30, and the first wavelength conversion device 30 is excited to generate a first fluorescence A, which propagates to the second wavelength conversion device 50, and part of the first fluorescence A excites the second wavelength conversion device 50 to generate a second fluorescence B. The second fluorescence B and part of the first fluorescence A are mixed to form an outgoing light. The second wavelength conversion device 50 includes at least a red fluorescence layer, and the second fluorescence B includes at least red fluorescence. The red fluorescence increases the color rendering index of the outgoing light. As an example, if the first fluorescence A is a yellow-green mixed fluorescence, the addition of red fluorescence can improve the color rendering index of white light. The red fluorescence is generated by the first fluorescence A exciting the red fluorescence layer, which avoids the problem of thermal attenuation of the red fluorescence layer directly excited by the excitation light P, and improves the application stability of the red fluorescence layer, so as to achieve the effect of increasing the proportion of the red light-emitting component and achieving the output of warm white light while avoiding the photothermal damage of the red fluorescence layer.

[0031] In this embodiment, the light source 10 is used to emit an excitation light P to excite the first wavelength conversion device 30 to generate the first fluorescence A. This specification does not limit the specific type of the light source 10. For example, the light source 10 can be an LED light source or a laser light source. In this embodiment, the light source 10 is a laser light source, the excitation light P can include an ultraviolet laser, and the light source 10 includes an ultraviolet laser emitter.

[0032] See also Figure 3 and Figure 4, the first wavelength conversion device 30 may include a first fluorescent layer 33, and the first fluorescent layer 33 is excited to generate a first fluorescent light A. The first fluorescent layer 33 may include a first sub-fluorescent layer 34 and a second sub-fluorescent layer 36. The first sub-fluorescent layer 34 is excited to generate a first sub-fluorescent light A1, and the second fluorescent layer 334 is excited to generate a second sub-fluorescent light A2. The wavelength of the first sub-fluorescent light A1 is different from the wavelength of the second sub-fluorescent light A2, and the wavelength of the first sub-fluorescent light A1 and the wavelength of the second sub-fluorescent light A2 are both smaller than the wavelength of red fluorescent light. The first wavelength conversion device 30 is arranged on the optical path of the excitation light P, and the excitation light P is used to excite the fluorescent layer to generate fluorescent light. The luminescence mechanism of the fluorescent layer is to excite the molecules or atoms of the substance through high energy, so that they enter an excited state, and when they are de-excited from the excited state to the ground state, they release photons, that is, generate fluorescent light. The wavelength of the first sub-fluorescent light A1 and the wavelength of the second sub-fluorescent light A2 are both smaller than the wavelength of the red fluorescent light, so that the red fluorescent layer of the second wavelength conversion device 50 can be excited by the first fluorescent light A to generate red fluorescent light.

[0033] In this embodiment, the first wavelength conversion device 30 may further include a substrate 32, and a first sub-fluorescent layer 34 and a second sub-fluorescent layer 36 are disposed on the substrate 32. The present specification does not limit the specific types of the first sub-fluorescent layer 34 and the second sub-fluorescent layer 36, and the first sub-fluorescent layer 34 and the second sub-fluorescent layer 36 are adapted to the type of the excitation light P. For example, the light source 10 may include a first light source 12 and a second light source 14, wherein the first light source 12 is used to excite the first sub-fluorescent layer 34, and the second light source 14 is used to excite the second sub-fluorescent layer 36. As an example, the first light source 12 is an ultraviolet light source, and the excitation light P emitted by the first light source 12 is an ultraviolet laser. The first sub-fluorescent layer 34 excited by the excitation light P emitted by the first light source 12 may be a blue fluorescent layer, and the first sub-fluorescent layer A1 is a blue fluorescent layer. The second light source 14 may be an ultraviolet light source or a blue light source, and the excitation light P emitted by the second light source 14 may be an ultraviolet laser or a blue laser. The second sub-fluorescent layer 36 excited by the excitation light P emitted by the second light source 14 may be a yellow fluorescent layer and / or a green fluorescent layer, and the second sub-fluorescent layer A2 is green fluorescent layer and / or yellow fluorescent layer.

[0034] As an example, the first sub-fluorescent layer 34 is a blue fluorescent layer, the second sub-fluorescent layer 36 is a green fluorescent layer, the first sub-fluorescent layer A1 is blue fluorescent, and the second sub-fluorescent layer A2 is green fluorescent. When in use, the light source 10 emits an ultraviolet laser (excitation light P), and the ultraviolet laser propagates to the first sub-fluorescent layer 34 and the second sub-fluorescent layer 36, the first sub-fluorescent layer 34 is excited to produce blue fluorescence, and the second sub-fluorescent layer 36 is excited to produce green fluorescence. The blue fluorescence and the green fluorescence propagate to the red fluorescent layer of the second wavelength conversion device 50, and part of the blue fluorescence and part of the green fluorescence excite the red fluorescent layer to produce red fluorescence. The red fluorescence, part of the blue fluorescence and part of the green fluorescence are mixed to form white light emission light. The addition of red fluorescence greatly improves the color rendering index of the white light emission light, and increases the scope of application of the light source module 100 provided in the embodiment of the present application.

[0035] Please also see Figure 3 and Figure 4 The present specification does not limit the arrangement of the first sub-fluorescent layer 34 and the second sub-fluorescent layer 36 on the substrate 32. For example, the first sub-fluorescent layer 34 and the second sub-fluorescent layer 36 can be mixed and arranged on the substrate 32. In this embodiment, the first sub-fluorescent layer 34 and the second sub-fluorescent layer 36 are mixed to form a mixed fluorescent layer, such as a yellow-green mixed fluorescent layer, a blue-green mixed fluorescent layer, etc. In other embodiments, the first sub-fluorescent layer 34 and the second sub-fluorescent layer 36 can be respectively arranged at different positions of the substrate 32.

[0036] See also Figure 5 In this embodiment, the light source module 100 may further include a housing 70 and a selection film 80. The housing 70 may include a first cavity 72 and a second cavity 74 that are connected. The first wavelength conversion device 30 is disposed in the first cavity 72, and the second wavelength conversion device 50 is disposed in the second cavity 74. The selection film 80 is disposed in the housing 70 and separates the first cavity 72 and the second cavity 74. The selection film 80 is used to reflect the excitation light P and transmit the first fluorescence A. The first wavelength conversion device 30 and the second wavelength conversion device 50 are placed in the first cavity 72 and the second cavity 74, respectively. The separation of the two reduces the possibility that the excitation light P excites the second wavelength conversion device 50, and improves the stability of the red fluorescent layer.

[0037] The present specification does not limit the specific material of the housing 70. For example, the material of the housing 70 may include aluminum alloy, stainless steel, etc. The first cavity 72 may include a first sub-cavity 721 and a second sub-cavity 723. The first sub-fluorescent layer 34 is disposed on the side wall of the first sub-cavity 721, and the second sub-fluorescent layer 36 is disposed on the side wall of the second sub-cavity 723. The first light source 12 and the second light source 14 correspond to the positions of the first sub-cavity 721 and the second sub-cavity 723, respectively. The excitation light P emitted by the first light source 12 enters the first sub-cavity 721 to excite the first sub-fluorescent layer 34, and the excitation light P emitted by the second light source 14 enters the second sub-cavity 723 to excite the second sub-fluorescent layer 36.

[0038] The first wavelength conversion device 30 may further include a first reflective layer 321, which may include a first sub-reflective layer 323 and a second sub-reflective layer 325. The first sub-reflective layer 323 is disposed between the side wall of the first sub-cavity 721 and the first sub-fluorescent layer 34, and the second sub-reflective layer 325 is disposed between the side wall of the second sub-cavity 723 and the second sub-fluorescent layer 36.

[0039] In this embodiment, the first reflective layer 321 is the substrate 32 mentioned above, and the number of the substrates 32 can be two. The first sub-reflective layer 323 and the second sub-reflective layer 325 are respectively used as the substrates 32 of the first sub-fluorescent layer 34 and the second sub-fluorescent layer 36. The first sub-reflective layer 323 is located on the optical path of the excitation light P emitted by the first light source 12. The excitation light P enters the first sub-cavity 721 and is transmitted to the first sub-fluorescent layer 34 on the first sub-reflective layer 323. The excitation light P excites the first sub-fluorescent layer 34 to generate the first sub-fluorescent light A1. The first sub-fluorescent light A1 is reflected by the first sub-reflective layer 323 and is transmitted to the selection film 80. The first sub-fluorescent light A1 passes through the selection film 80 and enters the second cavity 74. Part of the first sub-fluorescent light A1 excites the second wavelength conversion device 50 to generate the second fluorescent light B. The second sub-reflection layer 325 is located on the optical path of the excitation light P emitted by the second light source 14. The excitation light P enters the second sub-cavity 723 and is transmitted to the second sub-fluorescent layer 36 on the second sub-reflection layer 325. The excitation light P excites the second sub-fluorescent layer 36 to generate the second sub-fluorescent light A2. The second sub-fluorescent light A2 is reflected by the second sub-reflection layer 325 and is transmitted to the selection film 80. The second sub-fluorescent light A2 passes through the selection film 80 and enters the second cavity 74. Part of the second sub-fluorescent light A2 excites the second wavelength conversion device 50 to generate the second fluorescence B.

[0040] The present specification does not limit the specific structure of the first reflective layer 321. For example, the first reflective layer 321 can be a dielectric film, a metal reflective film, a diffuse reflective film, etc. In this embodiment, the first reflective layer 321 is a total reflective film, the first cavity 72 is a closed cavity, and the first reflective layer 321 is disposed on the side wall of the first cavity 72. If the material of the housing 70 is light-transmissive, the first reflective layer 321 can be disposed on the outer wall of the first cavity 72 or on the inner wall of the first cavity 72; when the first reflective layer 321 is disposed on the outer wall of the first cavity 72, the reflective surface of the first reflective layer 321 faces the inside of the first cavity 72. In order to simplify the operation and reduce the oxidation of the first reflective layer 321, in this embodiment, the first reflective layer 321 is coated on the inner wall of the first cavity 72. The first sub-reflective layer 323 is coated on the inner wall of the first sub-cavity 721, and the first sub-fluorescent layer 34 is coated on the first sub-reflective layer 323. The second sub-reflection layer 325 is coated on the inner wall of the second sub-cavity 723 , and the second sub-fluorescent layer 36 is coated on the second sub-reflection layer 325 .

[0041] In some embodiments, the first cavity 72 is a whole cavity without partitions, and the first sub-fluorescent layer 34 and the second sub-fluorescent layer 36 can be mixed and coated on the first reflective layer 321. For example, the first fluorescent layer 33 is a blue-green mixed fluorescent layer, and the blue-green mixed fluorescent layer is coated on the first reflective layer 321. In other embodiments, the first sub-fluorescent layer 34 and the second sub-fluorescent layer 36 can be coated on different positions of the first reflective layer 321. For example, the first sub-fluorescent layer 34 and the second sub-fluorescent layer 36 are coated on opposite sides of the first reflective layer 321, or the two are arranged along the circumference of the first cavity 72.

[0042] In this embodiment, the selection film 80 can reflect the excitation light P and transmit the first fluorescence A. If part of the excitation light P is not absorbed by the first wavelength conversion device 30, it is reflected by the first reflection layer 321 to the selection film 80. Under the reflection effect of the selection film 80, the excitation light P will continue to be reflected and conducted in the first cavity 72, and will not enter the second cavity 74. On the one hand, it avoids the second wavelength conversion device 50 in the second cavity 74 from being excited by the excitation light P and being thermally quenched, thereby improving the stability of the light source module 100; on the other hand, the selection film 80 increases the number of reflections of the excitation light P in the first cavity 72, improves the excitation efficiency of the excitation light P, thereby increasing the number of times the first wavelength conversion device 30 is excited, and improves the utilization rate of the first wavelength conversion device 30. This specification does not limit the specific type of the selection film 80. The selection film 80 can be a transflective lens. In this embodiment, the selection film 80 is a band-pass light-transmitting lens.

[0043] The housing 70 may have a light incident side 71 and a light emitting side 73, and the light incident side 71 and the light emitting side 73 are arranged opposite to each other. The light incident side 71 is arranged on the side of the first cavity 72 away from the second cavity 74, and the light emitting side 73 is arranged on the side of the second cavity 74 away from the first cavity 72. This specification does not limit the specific shape of the housing 70. In this embodiment, the inner diameter of the light emitting side 73 of the housing 70 is smaller than the inner diameter of the light incident side 71, and the inner diameter of the housing 70 gradually decreases from the light incident side 71 to the light emitting side 73. The light source 10 is arranged on one side of the light incident side 71 of the housing 70, and the light incident side 71 is located on the optical path of the excitation light P. The light source 10 emits an excitation light P, and the excitation light P enters the housing 70 from the light incident side 71. The inner diameter of the housing 70 gradually decreases from the light incident side 71 to the light exit side 73. The first reflective layer 321 is arranged on the inner wall of the housing 70 in an inclined manner and faces the light incident side 71, which is conducive to light reflection, increases the number of light beam reflections in the housing 70, and improves the excitation efficiency of the excitation light P, thereby increasing the number of times the first wavelength conversion device 30 is excited and improving the utilization rate of the first wavelength conversion device 30. In order to further improve the light output quality, in this embodiment, the housing 70 at the light exit side 73 can be made of glass or sapphire.

[0044] In this embodiment, the light source module 100 may further include a light-transmitting substrate 90, which is disposed between the light incident side 71 and the light source 10, and the light source 10 is disposed opposite to the light-transmitting substrate 90. The light-transmitting substrate 90 may be a transparent material substrate, such as a sapphire transparent substrate, a glass substrate, or a transparent ceramic substrate. The heat dissipation performance of the light-transmitting substrate 90 is better than that of the housing 70, and the light-transmitting substrate 90 may also be an aluminum alloy substrate, and holes for light transmission may be provided on the aluminum alloy substrate.

[0045] The light source module 100 may further include a lens 110, which is disposed on the light-emitting side 73. The first sub-fluorescent light A1, the second sub-fluorescent light A2 and the red fluorescent light merge in the second cavity 74 and are emitted through the lens 110, which improves the uniformity of the emitted light.

[0046] In this embodiment, the second wavelength conversion device 50 may further include a second reflective layer 52, the second reflective layer 52 is disposed on the inner wall of the second cavity 74, the red fluorescent layer is disposed on the second reflective layer 52, and the second reflective layer 52 is used to reflect the second fluorescent light B to the light-exiting side 73. Further, the second cavity 74 has a bottom wall 741, the bottom wall 741 is disposed opposite to the light-exiting side 73, the second reflective layer 52 is coated on the bottom wall 741, and the second wavelength conversion device 50 is disposed on the second reflective layer 52. This specification does not limit the specific type of the second reflective layer 52, and the second reflective layer 52 may include at least one of a dielectric film, a metal reflective film, a diffuse reflective film, and the like.

[0047] In this embodiment, the second wavelength conversion device 50 may further include a third reflection layer 54, which is disposed at the edge of the light-exiting side 73 and is used to reflect part of the first fluorescence A to the second wavelength conversion device 50. The third reflection layer 54 may be coated on the periphery of the inner wall of the light-incoming side 71 of the housing 70. When the first sub-fluorescence A1 and the second sub-fluorescence A2 emitted from the first sub-cavity 721 and the second sub-cavity 723 to the second cavity 74 propagate to the edge of the light-exiting side 73, they will be reflected to the second wavelength conversion device 50 by the third reflection layer 54 disposed at the edge of the light-exiting side 73, so as to excite the second wavelength conversion device 50 to generate the second fluorescence B. The third reflection layer 54 increases the number of times the second wavelength conversion device 50 is excited, thereby improving the utilization rate of the second wavelength conversion device 50. This specification does not limit the specific type of the third reflection layer 54, and the third reflection layer 54 may include at least one of a dielectric film, a metal reflection film, a diffuse reflection film, and the like.

[0048] The second reflective layer 52 may have a reflective surface 521 for reflecting the second fluorescent light B, and the second wavelength conversion device 50 is disposed on the reflective surface 521. In this embodiment, the light source module 100 may further include a cooling device 20, which is disposed on a side of the second reflective layer 52 away from the reflective surface 521 for cooling the second wavelength conversion device 50. The cooling device 20 reduces the operating temperature of the red fluorescent layer under high power use, which not only avoids the red fluorescent layer from decreasing efficiency due to heat accumulation, but also improves the stability of the red fluorescent layer, thereby improving the color light stability of the light source module 100 and extending the operating life of the light source module 100.

[0049] In order to facilitate the installation of the cooling device 20, in this embodiment, the housing 70 further includes a third cavity 76, the third cavity 76 is adjacent to the second cavity 74, and the cooling device 20 is disposed in the third cavity 76. As an example, the third cavity 76 is disposed in the middle of the housing 70 and is located between the light incident side 71 and the second cavity 74. The first cavity 72 is disposed around the outside of the third cavity 76. If the number of the first cavity 72 is one, the first cavity 72 is a whole annular cavity; if the number of the first cavity 72 is two, the two first cavities 72 can be connected end to end and surround the outside of the third cavity 76 together, and the two first cavities 72 can be symmetrically disposed.

[0050] This specification does not limit the specific type of the cooling device 20. For example, the cooling device 20 may be an air cooling device, a liquid cooling device, or a mixed air cooling and liquid cooling device. The cooling device 20 may include at least one of cooling structures such as a liquid cooling plate and a fan.

[0051] When the light source module 100 provided in the embodiment of the present application is used, the light source 10 emits an excitation light P, and the excitation light P propagates to the first wavelength conversion device 30, the first wavelength conversion device 30 is excited to generate the first fluorescence A, and the first fluorescence A propagates to the second wavelength conversion device 50, and part of the first fluorescence A excites the second wavelength conversion device 50 to generate the second fluorescence B. The second fluorescence B and part of the first fluorescence A are mixed to form the output light. The second wavelength conversion device 50 includes at least a red fluorescent layer, and the second fluorescence B includes at least red fluorescence. The red fluorescence increases the color rendering index of the output light. The red fluorescence is generated by the first fluorescence A exciting the red fluorescent layer, avoiding the problem of thermal attenuation of the red fluorescent layer directly excited by the excitation light P, and improving the application stability of the red fluorescent layer, so as to achieve the effect of increasing the proportion of the red light-emitting component and achieving the output of warm white light while avoiding the photothermal damage of the red fluorescent layer.

[0052] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, 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 may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0053] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application 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 make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A light source module, characterized in that: The light source module comprises: A light source, for emitting excitation light; a first wavelength conversion device, disposed on the optical path of the excitation light, and used to generate a first fluorescence under the excitation of a part of the excitation light; and A second wavelength conversion device is arranged in the optical path of the first fluorescence, and is used to generate a second fluorescence under the excitation of part of the first fluorescence, the wavelength of the first fluorescence is smaller than the wavelength of the second fluorescence, and the second fluorescence and part of the first fluorescence are mixed to form an output light, wherein the second wavelength conversion device at least includes a red fluorescent layer, and the second fluorescent includes at least red fluorescence.

2. The light source module according to claim 1, characterized in that: The first wavelength conversion device includes a first fluorescent layer, the first fluorescent layer includes a first sub-fluorescent layer and a second sub-fluorescent layer, the first sub-fluorescent layer and the second sub-fluorescent layer are excited to generate a first sub-fluorescent light and a second sub-fluorescent light respectively, the wavelength of the first sub-fluorescent light and the wavelength of the second sub-fluorescent light are different, and the wavelength of the first sub-fluorescent light and the wavelength of the second sub-fluorescent light are both smaller than the wavelength of the red fluorescence.

3. The light source module according to claim 2, characterized in that: The light source comprises a first light source and a second light source, the first light source excites the first sub-fluorescent layer, and the second light source excites the second sub-fluorescent layer; Wherein, the first light source is an ultraviolet light source, and the first sub-fluorescent layer is a blue fluorescent layer; The second light source is an ultraviolet light source or a blue light source, and the second sub-fluorescent layer is a yellow fluorescent layer and / or a green fluorescent layer.

4. The light source module according to claim 3, characterized in that: The light source module also includes a shell and a selection membrane, the shell includes a first cavity and a second cavity that are connected, the first wavelength conversion device is arranged in the first cavity, and the second wavelength conversion device is arranged in the second cavity; the selection membrane is arranged in the shell and separates the first cavity and the second cavity, and the selection membrane is used to reflect the excitation light and transmit the first fluorescence.

5. The light source module according to claim 4, characterized in that: The first cavity includes a first sub-cavity and a second sub-cavity. The first sub-luminescent layer is disposed on a side wall of the first sub-cavity; and the second sub-luminescent layer is disposed on a side wall of the second sub-cavity.

6. The light source module according to claim 5, characterized in that: The first wavelength conversion device also includes a first reflective layer, which includes a first sub-reflective layer and a second sub-reflective layer. The first sub-reflective layer is arranged between the side wall of the first sub-cavity and the first sub-fluorescent layer, and the second sub-reflective layer is arranged between the side wall of the second sub-cavity and the second sub-fluorescent layer.

7. The light source module according to claim 4, characterized in that: The housing is provided with a light incident side, and the light incident side is arranged on a side of the first cavity away from the second cavity; the light source module further comprises a light-transmitting substrate, and the light-transmitting substrate is arranged between the light incident side and the light source.

8. The light source module according to claim 4, characterized in that: The housing is provided with a light emitting side, and the light emitting side is arranged on a side of the second cavity away from the first cavity. The light source module further includes a lens, and the lens is arranged on the light emitting side.

9. The light source module according to claim 8, characterized in that: The second wavelength conversion device further includes a second reflective layer, which is disposed on the inner wall of the second cavity, and the red fluorescent layer is disposed on the second reflective layer, and the second reflective layer is used to reflect the second fluorescent light to the light output side.

10. The light source module according to claim 8, characterized in that: The second wavelength conversion device further includes a third reflection layer, which is disposed at an edge of the light-emitting side and is used to reflect a portion of the first fluorescence to the second wavelength conversion device.

11. The light source module according to claim 9, characterized in that: The light source module further includes a cooling device, the housing further includes a third cavity, the third cavity is adjacent to the second cavity, the cooling device is disposed in the third cavity, and the cooling device is used to cool the second wavelength conversion device.

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

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