WO2018137312A1

WO2018137312A1 - Fluorescent module and relevant light source

Info

Publication number: WO2018137312A1
Application number: PCT/CN2017/090332
Authority: WO
Inventors: 胡飞
Original assignee: 深圳市绎立锐光科技开发有限公司
Priority date: 2017-01-25
Filing date: 2017-06-27
Publication date: 2018-08-02
Also published as: CN206669352U

Abstract

A fluorescent module (10), comprising: a substrate (120) which comprises a first surface (1201), the first surface (1201) being provided with a groove (1202); and a wavelength conversion layer (110) disposed in the groove (1202) and configured to convert an incident excitation light into an excited light having a wavelength range different from that of the excitation light and then emit same. The wavelength conversion layer (110) comprises a light incident surface (1101); the maximum length of the wavelength conversion layer (110) in a direction parallel to the light incident surface (1101) is greater than the maximum length in the direction perpendicular to the light incident surface (1101); and a light reflective layer is disposed on all surfaces of the wavelength conversion layer (110) except the light incident surface (1101). A reflective cover (130) connected to the substrate (120) covers the first surface (1201) from above and surrounds, together with the first surface (1201), the wavelength conversion layer (110); the reflective cover (130) comprises a second surface (1301) close to one side of the wavelength conversion layer (110), and is capable of reflecting the excited light incident on the second surface (1301) back to the wavelength conversion layer (110); and the reflective cover (130) further comprises a first light through opening ( 131) for transmission of the excited light.

Description

Fluorescent module and related light source

Technical field

The utility model relates to the field of illumination and display, in particular to a fluorescent module and a related light source.

Background technique

In the field of illumination and display, high brightness has always been the goal pursued by those skilled in the art, and at the same time, factors such as energy conversion efficiency, light source life, and light source volume are also taken into consideration.

The brightness of halogen lamps and gas discharge lamps reaches the bottleneck, the energy conversion efficiency is low, the life is short, a large amount of heat is generated during use, and the halogen lamps and gas discharge lamps are large in size, and are increasingly unsuitable for new lighting display application scenarios.

LED light sources have high energy conversion efficiency and long life, which is a cold light source, but the optical power density of a single LED is low. High-brightness LED technology achieves high-power-density light by combining multiple LEDs by combining the illumination of multiple LEDs. However, in this technical solution, the combination of multiple LEDs causes an increase in the volume of the light source, and at the same time brings about a problem of an increase in the volume of the heat dissipating component, resulting in a low power density of the outgoing light per unit volume of the light source.

LD (Laser Diode, laser diode) The light source is the same as the LED light source, but the optical power density of a single LD is much higher than the optical power density of the LED. However, the spectrum of LD has limitations, and the cost of green LD is high, resulting in high cost of RGB LD combination light source, which is not suitable for large-scale applications. Therefore, the prior art generally obtains white light by a laser-excited phosphor technique in which a blue phosphor is excited by a blue LD.

technical problem

However, the light emitted by the phosphor is a Lambertian-distributed light with a large light divergence angle, and the collecting lens can only collect light having a light divergence angle of about 150° (±75°), resulting in partial light being unused. Moreover, the phosphor has a heat dissipation problem, and an excessively high temperature causes a decrease in the luminous efficiency of the fluorescent material. Therefore, it is generally required to combine the LD light source with the rotating fluorescent color wheel structure to improve the heat dissipation of the phosphor, and additionally add a motor and the like, resulting in an increase in the volume of the light source, limiting the laser phosphor light source in a small size, miniature device. Application on. In addition, prior art solutions often do not consider the problem of optical loss when light propagates within the illumination device. In summary, the luminous efficiency of the existing laser-excited phosphor technology is not high enough, which weakens its competitiveness in the field of high-brightness illumination display.

Technical solution

In view of the above-mentioned prior art laser-excited phosphor technology, the luminous efficiency is low, and the present invention provides a fluorescent module with high luminous efficiency, comprising: a substrate comprising a first surface, wherein the first surface is provided with a groove; a wavelength conversion layer disposed in the recess for converting incident excitation light into a laser beam having a wavelength range different from the excitation light, the wavelength conversion layer including a light incident surface, the wavelength conversion a maximum length of the layer in a direction parallel to the light incident surface is greater than a maximum length in a direction perpendicular to the light incident surface, and a surface of the wavelength conversion layer other than the light incident surface is provided with a light reflecting layer; a reflective cover connected to the substrate, covering the first surface, and surrounding the wavelength conversion layer together with the first surface, the reflective cover including a second side adjacent to the wavelength conversion layer The surface is capable of reflecting the laser light incident on the second surface back to the wavelength conversion layer, and the reflection cover further includes a first light passage for transmitting the laser light.

In one embodiment, a straight line passing through a direction perpendicular to the light incident surface and passing through the center of the wavelength conversion layer passes through the first light passing opening.

In one embodiment, the reflector is a hemispherical reflector, the wavelength conversion layer is disposed at a spherical center position of the reflector, and a solid angle of a cone surrounded by the center and the first light passage It is 0.03π~0.586π.

In one embodiment, the first light passing port is a light incident port of the excitation light.

In one embodiment, the reflector further includes a second light passing port, wherein the second light passing port is a light incident port of the excitation light, and the first light passing port is capable of reflecting the excitation light. The second light passing port is capable of reflecting the received laser light.

In one embodiment, the maximum length of the wavelength conversion layer is less than 1/5 of the maximum length of the substrate on a plane parallel to the light incident surface.

In one embodiment, the thickness of the wavelength conversion layer is greater than the depth of the groove along a direction perpendicular to the light incident surface.

In one embodiment, the first light-passing port is provided with an optical element, which is a dichroic color film or a lens.

In one embodiment, the wavelength conversion layer is a fluorescent ceramic. Fluorescent ceramics have the characteristics of less self-priming, that is, the laser light emitted by the fluorescent ceramic is not easily absorbed by the fluorescent ceramic.

In one embodiment, the substrate is a metal substrate, a silicon substrate, or an aluminum nitride substrate. This type of substrate has good thermal conductivity and is easy to process.

In one embodiment, the first surface is a light reflecting surface. The absorption loss of light in the fluorescent module is further reduced so that light incident at the non-groove position of the first surface can also be collected.

The present invention also provides a light source comprising any of the above fluorescent modules, further comprising an excitation light source for emitting excitation light, the wavelength conversion layer being disposed on the optical path of the excitation light.

In one embodiment, the excitation source is a laser source.

Beneficial effect

Compared with the prior art, the utility model comprises the following beneficial effects: by arranging the wavelength conversion layer in the groove of the substrate, the maximum length of the wavelength conversion layer in a direction parallel to the light incident surface is greater than perpendicular to the light incident surface. The maximum length of the direction, and the light reflecting layer is disposed on a surface other than the light incident surface of the wavelength conversion layer, on the one hand, the optical path of the light in the wavelength conversion layer is short, and the laser beam can be quickly emitted after being formed. The loss caused by the propagation of light in the wavelength conversion layer is reduced, and on the other hand, the wavelength conversion layer is thinner, the heat is mainly dispersed from the bottom of the wavelength conversion layer, the heat conduction distance is shortened, the thickness of the substrate is reduced, and the wavelength conversion layer is also surrounded. The reflector reflects the laser light incident on the second surface of the reflector, so that all the laser light is emitted from the first passage of the reflector, which reduces the range of the laser divergence angle emitted by the fluorescent module, making it easier to be collected by the light. Component collection. Under the synergy of the above components, the fluorescent module reduces light loss, improves heat dissipation, and achieves higher luminous efficiency.

DRAWINGS

1 is a schematic cross-sectional view of one embodiment of a fluorescent module of the present invention.

2 is a schematic cross-sectional view showing another embodiment of the fluorescent module of the present invention.

3 is a schematic cross-sectional view showing another embodiment of the fluorescent module of the present invention.

BEST MODE FOR CARRYING OUT THE INVENTION

In some sources of laser-excited phosphors, by exciting the excitation light back and forth in the wavelength conversion layer, all of them are converted into laser light, and then guided by the laser through an opening. These technical solutions incorrectly assume that "all light can be emitted after several reflections" as a hypothesis, ignoring the loss of light in each reflection. In fact, if the reflectance of each reflection is 99%, then 20 times of reflection will lose about 20% of the light, which does not meet the technical requirements of high brightness and low power consumption in the illumination display.

The main design concept of the fluorescent module provided by the utility model is to reduce unnecessary optical loss, including loss caused by light reflection, light absorption, insufficient light utilization rate and thermal effect. The utility model selects the wavelength conversion layer whose parallel length to the direction of the light incident surface is greater than the maximum length perpendicular to the direction of the light incident surface, so as to reduce the optical path of the light in the wavelength conversion layer and increase the heat dissipation area of the wavelength conversion layer. The reflector surrounding the wavelength conversion layer directly reflects the laser light from the wavelength conversion layer back to the wavelength conversion layer, thereby avoiding the loss caused by multiple reflections.

The descriptions of the "first", "second" and the like in the present invention are used for descriptive purposes only, for convenience of description, and are not to be construed as indicating or implying their relative importance or implicitly indicating the indicated technical features. quantity. Thus, features defining "first" or "second" may include at least one of the features, either explicitly or implicitly.

The embodiments of the present invention are described in detail below with reference to the accompanying drawings and embodiments.

Please refer to FIG. 1. FIG. 1 is a schematic cross-sectional view showing an embodiment of a fluorescent module of the present invention. The fluorescent module 10 includes a substrate 120, a wavelength conversion layer 110, and a reflective cover 130.

The substrate 120 includes a first surface 1201, and a groove 1202 is disposed on the first surface 1201.

The wavelength conversion layer 110 is disposed in the recess 1202 for converting the incident excitation light into a laser light having a wavelength range different from the excitation light. The wavelength conversion layer 110 includes a light incident surface 1101. The maximum length of the wavelength conversion layer 110 in a direction parallel to the light incident surface 1101 is greater than a maximum length in a direction perpendicular to the light incident surface 1101, and the wavelength of the wavelength conversion layer is incident on the light. The other faces other than the face 1101 are provided with a light reflecting layer.

The reflector 130 is coupled to the substrate 120 and overlies the first surface 1201 such that the reflector 130 and the first surface 1201 together surround the wavelength conversion layer 110. The reflector 130 includes a second surface 1301 adjacent to one side of the wavelength conversion layer, and is capable of reflecting the laser light incident on the second surface 1301 back to the wavelength conversion layer 110. The reflector 130 further includes a first light passage 131 for transmitting the laser light.

In the present embodiment, the excitation light is incident on the light incident surface 1101 of the wavelength conversion layer 110 through the first light-passing port 131 of the reflection cover 130, and the wavelength conversion layer 110 absorbs the excitation light and emits the laser light, and the laser is approximately Lambertian. The light exits from the wavelength conversion layer 110. Since the light reflecting layer is provided on the surface other than the light incident surface 1101 of the wavelength conversion layer 110, the laser light can be emitted only from the light incident surface 1101, and the angle of the emitted light is 180° (±90°). The laser light incident on the first light-passing port 131 of the reflection cover 130 is directly emitted, and the light incident on the second surface 1301 of the reflection cover 130 is reflected back to the wavelength conversion layer 110, and the portion returns to the light of the wavelength conversion layer 110. After being scattered by the wavelength conversion layer, light having an approximately Lambertian distribution is again emitted from the wavelength conversion layer 110. The above process is repeated, and finally the laser light is emitted from the first light-passing port 131, and the divergence angle of the outgoing light emitted from the first light-passing port 131 is greatly reduced with respect to the light-emitting angle of the light-incident surface 1101, which is favorable for the subsequent optical components. Collect and use.

In the present invention, each of the wavelength conversion layers except the light incident surface is provided with a light reflecting layer to prevent light from exiting from the side of the wavelength conversion layer. If there is no light reflection layer on the side, the light emitted from the side surface is reflected by the reflector and is difficult to directly return to the wavelength conversion layer, which is difficult to collect and utilize, resulting in light loss.

In the present invention, the wavelength conversion layer 110 functions to receive the excitation light and convert the excitation light into laser light of different wavelengths. The excitation light here may be light emitted by a solid-state light source, such as LED light, laser diode light, laser light, or any other source light as disclosed in the present application. The wavelength conversion layer may be a silicone/resin organic package phosphor layer, a glass package phosphor layer, or a fluorescent ceramic. Because the fluorescent ceramic is a ceramic structure, its thermal stability and thermal conductivity are far superior to those of glass or silica gel as the package matrix, which can withstand high-power excitation light, and can be applied to high-brightness laser fluorescent illumination/display field. .

The fluorescent ceramics may be pure phase fluorescent ceramics, specifically various oxide ceramics, nitride ceramics or oxynitride ceramics, and formed by incorporating a trace amount of activator elements (such as lanthanides) into the ceramic preparation process. center. Since the doping amount of the general activator element is small (generally less than 1%), the fluorescent ceramic is usually a transparent or translucent luminescent ceramic, and the excitation light is easily emitted directly after passing through the luminescent ceramic layer, so that the luminescent ceramic layer is The luminous efficiency is not high, and it is more suitable for the lower power excitation light application scene. For example, the fluorescent ceramic may be a Ce doped YAG ceramic or a Ce doped LuAG ceramic.

The fluorescent ceramic may also be a composite ceramic layer having a transparent/translucent ceramic as a matrix in which luminescent ceramic particles (such as phosphor particles) are distributed. The transparent/translucent ceramic substrate may be various oxide ceramics (such as alumina ceramics, Y3Al5O12 ceramics), nitride ceramics (such as aluminum nitride ceramics) or oxynitride ceramics, and the ceramic matrix functions to conduct light and heat. The excitation light can be incident on the luminescent ceramic particles and the laser light can be emitted from the luminescent ceramic layer; the luminescent ceramic particles bear the main illuminating function of the luminescent ceramic layer for absorbing the excitation light and converting it into a laser. The granules of the luminescent ceramic particles have a large grain size, and the doping amount of the activator element is large (for example, 1 to 5%), so that the luminescence efficiency is high; and the luminescent ceramic particles are dispersed in the ceramic matrix, thereby avoiding the presence of the fluorescent ceramics. The luminescent ceramic particles in the deep position cannot be irradiated by the excitation light, and the poisoning of the activator element concentration caused by the large doping amount of the pure phase fluorescent ceramic is avoided, thereby improving the luminous efficiency of the luminescent ceramic layer. Further, in the above fluorescent ceramic, scattering particles may be added to distribute the scattering particles in the ceramic matrix. The scattering particles may be scattering particles such as alumina, cerium oxide, zirconium oxide, cerium oxide, titanium oxide, zinc oxide, barium sulfate, etc., either as scattering particles of a single material or as a combination of two or more kinds. It is characterized by an apparent white color, which is capable of scattering visible light, and is stable in material and capable of withstanding high temperatures. The particle size is of the same order of magnitude or an order of magnitude lower than the wavelength of the excitation light.

The fluorescent ceramic may also be another composite ceramic layer which differs from the composite ceramic layer described above only in the ceramic matrix. In the present embodiment, the ceramic substrate is a pure phase fluorescent ceramic, that is, the ceramic substrate itself has an activator capable of emitting a laser light under irradiation of excitation light. The technical scheme combines the advantages of the luminescent ceramic particles of the above composite ceramic layer with high luminous efficiency and the above-mentioned pure phase fluorescent ceramics having the luminescent property, and simultaneously illuminating by using the luminescent ceramic particles and the ceramic matrix, thereby further improving the luminescent ceramic layer. The luminous efficiency, and the ceramic matrix has a certain amount of activator doping, but the doping amount is low, and the ceramic substrate can ensure sufficient light transmittance. In the luminescent ceramic layer, it is also possible to increase the internal scattering of the luminescent ceramic layer by the scattering particles.

In the present invention, the light reflecting layer of the wavelength conversion layer other than the light incident surface can be realized by plating a reflective film on the surface of the wavelength conversion layer, and then the wavelength conversion layer and the substrate are welded or bonded. The way is connected. In one embodiment, the reflective film layer may also be plated/coated on the first surface of the substrate or only at the surface location of the recess, and then the wavelength converting layer is disposed within the recess.

In the present invention, the main function of the substrate 120 is to carry the wavelength conversion layer 110 and serve as a heat dissipation conductor of the wavelength conversion layer 110. The substrate 120 may be a metal substrate, a silicon substrate or an aluminum nitride substrate, and these substrates are characterized by good thermal conductivity and easy processing.

In an embodiment of the embodiment, the first surface 1201 of the substrate 120 is a light reflecting surface capable of reflecting light incident on the first surface 1201. When the laser light is emitted from the wavelength conversion layer 110 and reflected between the reflection cover 130 and the wavelength conversion layer 110, there is a possibility that a small portion of the light fails to return from the reflection cover 130 to the wavelength conversion layer 110, and the first surface is The 1201 is set as a light reflecting surface to reduce the light loss caused thereby. This function can be achieved by plating a reflective film on the first surface 1201.

In one embodiment of the present embodiment, as shown, a straight line passing through a direction perpendicular to the light incident surface 1101 and passing through the center of the wavelength conversion layer 110 passes through the first light passing opening. Specifically, light that is perpendicularly emitted from the light incident surface 1101 of the wavelength conversion layer 110 can be directly emitted through the first light passing opening 131. Setting the first light passing port 131 at this position is advantageous for improving light emission efficiency. It can be understood that in other embodiments, the first light-passing port can also be disposed at other positions, so that the light obliquely emitted from the wavelength conversion layer can be directly emitted through the first light-passing port.

In one embodiment of the embodiment, the reflector 130 is a hemispherical reflector, and the wavelength conversion layer 110 is disposed at a center of the reflector 130 such that the laser-received path reflected by the second surface 1301 returns to the wavelength. The conversion layer 110 avoids the optical path offset and cannot directly return to the wavelength conversion layer 110.

The first light passing port 131 cannot be too large, otherwise the divergence angle of the emitted laser light is too large, and some light may not be utilized when entering the subsequent optical element. The first light-passing port 131 is also not too small, otherwise the light reflected by the second surface 1301 is much more than the light emitted through the first light-passing port 131, resulting in the number of times the laser light is increased by the wavelength conversion layer 110 and is The number of times the second surface 1301 is reflected, which will result in a large amount of light scattering loss and light reflection loss, which is disadvantageous for the improvement of luminous efficiency. In the schematic cross-sectional view shown in FIG. 1, the divergence angle of the laser light emitted from the first light-passing port 131 (ie, the angle between the leftmost light and the rightmost light) should be controlled between 20° and 90°. . When the first light-passing port 131 is circular, the solid angle of the cone surrounded by the center of the reflector and the first light-passing opening can be calculated to be about 0.03π to 0.586π. When the first light-passing port has other shapes, such as a rectangle or the like, as long as the solid angle of the cone surrounded by the center of the ball and the first light-passing opening is in the range of 0.03π to 0.586π, the laser light to be emitted can be made. Neither the divergence angle is too large nor the excessive scattering and reflected light loss.

In one embodiment, the first light-passing port 131 is positioned with a lens optical element capable of changing the angular distribution of the outgoing light. Further, the lens can be easily disassembled and replaced to meet the needs of different exit angle distributions.

In one embodiment, the first light-passing port 131 is further provided with a dichroic color optical element, and the dichroic color piece may be an angle selective filter having different transmission/reflection properties for light of different incident angles. , thereby controlling the angular distribution of the exiting light of the fluorescent module.

In the present invention, each point in the wavelength conversion layer may be a light-emitting point. If the size of the wavelength conversion layer is too large, it may cause more positional shift after multiple reflections by the laser, resulting in failure of the laser. The reflector is directly reflected back to the wavelength conversion layer to cause optical loss, so the size of the wavelength conversion layer needs to be limited. In one embodiment, the maximum length of the wavelength conversion layer is less than 1/5 of the maximum length of the substrate on a plane parallel to the light incident surface 1101. Taking a disk-type wavelength conversion layer and a substrate as an example, the diameters of the two are at least 5 times different. In addition to reducing optical loss, the present technical solution is also capable of improving the luminous efficiency per unit volume of the wavelength conversion layer.

Please refer to FIG. 2. FIG. 2 is a schematic cross-sectional view showing another embodiment of the fluorescent module of the present invention. The fluorescent module 20 includes a wavelength conversion layer 210, a substrate 220, and a reflective cover 230.

The difference from the embodiment shown in FIG. 1 is that the first light-passing port of the fluorescent module shown in FIG. 1 serves both as a light-emitting port for receiving the laser light and as a light incident port for exciting light, and in this embodiment, the excitation is performed. The light entrance of the light is different from the light exit of the laser. In this embodiment, the reflective cover 230 includes a first light passing opening 231 and a second light passing opening 232. The second light-passing port 232 is a light incident port for exciting light, and the first light-passing port 231 is a light-emitting port for receiving laser light. The first light passing port 231 can reflect the excitation light, and the second light passing port 232 can reflect the laser light. Under this technical solution, the optical path can be designed more flexibly.

In one embodiment, the transmission or reflection function of the excitation light and/or the laser light can be achieved by providing optical elements in the light-passing opening. Since the excitation light and the laser are different in wavelength range, the dichroic film can be selected as an optical element disposed at the light passage.

Please refer to FIG. 3. FIG. 3 is a schematic cross-sectional view showing another embodiment of the fluorescent module of the present invention. The fluorescent module 30 includes a wavelength conversion layer 310, a substrate 320, and a reflective cover 330.

The difference from the embodiment shown in FIG. 1 is that the thickness of the wavelength conversion layer 110 of the fluorescent module in FIG. 1 is equal to the depth of the groove 1202. In this embodiment, the thickness of the wavelength conversion layer 310 is greater than that on the substrate 320. The depth of the groove 3202. In the present embodiment, the light reflecting layer is provided on the other surfaces of the wavelength conversion layer 310 except the light incident surface, that is, the laser light can still be emitted only through the light incident surface, which is the same as the principle of the above embodiments.

The present invention also provides a light source, including the fluorescent module described in each of the above embodiments, and an excitation light source for emitting excitation light. The wavelength conversion layer is disposed on the optical path of the excitation light, and the excitation light emitted by the excitation light source is incident on the wavelength conversion layer through the first light passing port in FIG. 1/FIG. 3 or the second light passing port in FIG. 2, thereby performing excitation light emission. . Since the wavelengths of the excitation light and the laser light are different, in each of the embodiments corresponding to FIG. 1 and FIG. 3, a dichroic beam splitter is disposed between the excitation light source and the fluorescent module to provide excitation light and laser light. Different transflective properties to split the excitation and laser.

In one embodiment, the excitation source is a laser source, including a laser diode source, a laser diode array source, a laser source, and the like. The advantage of the laser light source is that the energy density is high, the divergence angle is small, and it is easy to be directly collected and guided onto the wavelength conversion layer, which is suitable for high-intensity illumination display.

The various embodiments in the present specification are described in a progressive manner, and each embodiment focuses on differences from other embodiments, and the same similar parts between the various embodiments may be referred to each other.

The above is only the embodiment of the present invention, and thus does not limit the scope of the patent of the present invention. Any equivalent structure or equivalent process transformation made by using the description of the utility model and the drawings, or directly or indirectly applied to other The related technical fields are all included in the scope of patent protection of the present invention.

Claims

A fluorescent module characterized by comprising

The substrate includes a first surface, and the first surface is provided with a groove;

a wavelength conversion layer disposed in the recess for converting incident excitation light into a laser beam having a wavelength range different from the excitation light, the wavelength conversion layer including a light incident surface, the wavelength conversion a maximum length of the layer in a direction parallel to the light incident surface is greater than a maximum length in a direction perpendicular to the light incident surface, and a surface of the wavelength conversion layer other than the light incident surface is provided with a light reflecting layer;

a reflective cover connected to the substrate, covering the first surface, and surrounding the wavelength conversion layer together with the first surface, the reflective cover including a side close to the wavelength conversion layer The two surfaces are capable of reflecting the laser light incident on the second surface back to the wavelength conversion layer, and the reflector further includes a first light passage for transmitting the laser light.

2. The fluorescent module according to claim 1, wherein a straight line passing through a direction perpendicular to a direction of the light incident surface and passing through a center of the wavelength conversion layer passes through the first light passing opening.

The fluorescent module according to claim 1 or 2, wherein the reflector is a hemispherical reflector, and the wavelength conversion layer is disposed at a center of the reflector, the center of the sphere and the first The solid angle of the cone enclosed by a light passage is 0.03π~0.586π.

The fluorescent module according to claim 1, wherein the first light passing port is a light incident port of the excitation light.

The fluorescent module according to claim 1, wherein the reflective cover further comprises a second light passing port, wherein the second light passing port is a light incident port of the excitation light, the first pass The optical port is capable of reflecting the excitation light, and the second light passing port is capable of reflecting the received laser light.

The fluorescent module according to claim 1, 2, 4 or 5, wherein a maximum length of the wavelength conversion layer is smaller than a maximum length of the substrate on a plane parallel to the light incident surface 1/5.

7. The fluorescent module according to claim 1, wherein a thickness of the wavelength conversion layer is greater than a depth of the groove in a direction perpendicular to the light incident surface.

The fluorescent module according to claim 1, wherein the first light-passing port is provided with an optical element, and the optical element is a dichroic color film or a lens.

9. The fluorescent module of claim 1 wherein the wavelength converting layer is a fluorescent ceramic.

The fluorescent module according to claim 1, wherein the substrate is a metal substrate, a silicon substrate or an aluminum nitride substrate.

The fluorescent module according to claim 1, wherein the first surface is a light reflecting surface.

A light source comprising the fluorescent module according to any one of claims 1 to 11, further comprising an excitation light source for emitting excitation light, the wavelength conversion layer being disposed on an optical path of the excitation light.

13. A light source according to claim 12 wherein the excitation source is a laser source.