Laser light source system

Abstract

The invention discloses a laser light source system which comprises a laser light source emitting laser beams, a collecting lens, a wavelength conversion device and a light receiving lens, the collecting lens, the wavelength conversion device and the light receiving lens are sequentially arranged on the path of the laser beams, the collecting lens converges the laser beams to the wavelength conversion device, and the wavelength conversion device converts at least part of the laser beams into excited light. The light receiving mirror collects excited light and unconverted laser, and the wavelength conversion device comprises a substrate and a wavelength conversion layer which are arranged in sequence; the wavelength conversion layer comprises a fluorescent layer and a scattering layer, the scattering layer is located on the side away from the substrate, and the fluorescent layer is formed by packaging first fluorescent powder particles and first white scattering particles through a first packaging body; and the scattering layer is formed by packaging second white scattering particles by a second packaging body or packaging second fluorescent powder particles and the second white scattering particles by the second packaging body. The laser light source system is compact in structure, good in uniformity of emitted light spots and high in illumination.

Description

Technical Field

[0001] The present invention relates to the field of laser technology, and more specifically, to a laser light source system. Background Art

[0002] The development of lighting technology has experienced a transformation from early kerosene lamps and candles to modern light bulbs and LED lighting. Light bulbs have the advantages of high brightness and low one-time investment cost, so the mainstream technology in the current lighting field is still dominated by light bulbs. However, as time goes by, the brightness of the light bulb will decay, and the decay is large, the life is short, and it needs to be replaced regularly, resulting in high maintenance costs in the later stage. Especially in some high-altitude use scenarios such as high-rise buildings and high bridges, it is difficult to replace lighting devices, and the maintenance cost is too high if they are replaced frequently. Based on these shortcomings of light bulbs, LED lighting technology has been gradually developed. LED light sources have the advantages of long life and low maintenance costs, so in many lighting fields, LED light sources have gradually replaced light bulb lighting. However, in some fields that require long light source irradiation distance and high irradiation brightness, the problem of low illumination of LED light sources has gradually emerged. People are looking forward to a lighting source with long life, higher brightness and longer irradiation distance. Laser (LD) lighting source technology has emerged. Since laser is a point light source, its beam divergence angle is small, and it has the advantages of high illumination, long irradiation distance, long life and low maintenance cost. At present, light bulbs, LEDs, and lasers have become the three major mainstream lighting technologies, and laser lighting technology has the greatest development prospects. The working principle of the most commonly used illumination laser is: the incident laser (the most common is blue laser) excites the wavelength conversion material to generate yellow light, and the yellow light is combined with the remaining blue light that has not been converted after the excitation to obtain the illumination white light. The lighting device using the LD laser light source can be divided into a reflective laser light source and a transmissive laser light source according to the light emission direction of the wavelength conversion device and the incident direction of the laser incident on its surface. The light emission direction of the wavelength conversion device in the reflective laser light source is opposite to the incident direction of the excitation light. Its light source has high brightness, but the structure is complex, and it contains many components such as lenses. The light source is large in size and has a high production cost. It is usually used in high laser power, high brightness, and lighting occasions that are not very sensitive to cost. Since the light emission direction of the wavelength conversion device of the transmissive laser light source is the same as the incident direction of the excitation light, the number of lenses required to process the light path is small, the structure is simple, the volume is small and convenient, and the production cost is low. In some light source lighting scenes that do not require high lighting brightness and are more sensitive to cost, the transmissive laser light source has great advantages. However, the light spot emitted by laser lighting usually has the problem of "yellow edge and blue center", also known as the yellow aperture phenomenon, which greatly affects the uniformity of the light spot and the lighting effect. Summary of the invention

[0003] The present invention aims to overcome at least one defect of the above-mentioned prior art and provide a laser light source system, which has a compact structure and has good uniformity of emitted light spot and high illumination.

[0004] The technical solution adopted by the present invention is as follows:

[0005] A laser light source system, comprising: a laser light source emitting a laser beam, a condenser, a wavelength conversion device and a light collecting mirror arranged in sequence on the path of the laser beam, the condenser converges the laser beam to the wavelength conversion device, the wavelength conversion device converts at least part of the laser beam into converted light, the light collecting mirror collects the converted light and unconverted laser light, and the wavelength conversion device comprises a substrate and a wavelength conversion layer arranged in sequence;

[0006] The wavelength conversion layer includes a fluorescent layer and a scattering layer, and the scattering layer is located on a side away from the substrate. The fluorescent layer is composed of a first package body encapsulating first fluorescent powder particles and first white scattering particles, the mass ratio of the first fluorescent powder particles to the first package body is 2:1 to 20:1, and the mass ratio of the first fluorescent powder particles to the first white scattering particles is 100:1 to 4:1; the scattering layer is composed of a second package body encapsulating second white scattering particles or the second package body encapsulating second fluorescent powder particles and second white scattering particles, the mass ratio of the second white scattering particles to the second package body is 0.1:1 to 2:1, and the mass ratio of the second fluorescent powder particles to the second white scattering particles is (0 to 0.5):1.

[0007] Furthermore, a mass ratio of the second white scattering particles to the second encapsulation body is 0.3:1 to 1:1, and a mass ratio of the second phosphor particles to the second white scattering particles is 0.1:1 to 0.3:1.

[0008] Furthermore, the scattering layer comprises an n-layer structure, and the mass ratio of the second white scattering particles to the second encapsulant in the first layer to the n-th layer gradually decreases, the first layer is located on the side of the scattering layer close to the substrate, and 2≤n≤10. Furthermore, the mass ratio of the second white scattering particles to the second encapsulant in the first layer is 1:1, and the mass ratio of the second white scattering particles to the second encapsulant in the n-th layer is 0.2:1.

[0009] Furthermore, the mass ratio of the first phosphor particles to the first encapsulation body is 3:1 to 15:1.

[0010] Furthermore, the fluorescent layer comprises an m-layer structure, the mass ratio of the first fluorescent powder particles to the first white scattering particles in the first layer to the m-th layer gradually decreases, the first layer is located on a side of the fluorescent layer close to the substrate, and 2≤m≤10.

[0011] Furthermore, the wavelength conversion layer also includes a first film layer for enhancing laser transmittance and a second film layer for transmitting laser and reflecting stimulated light. The first film layer is closely attached to the substrate and located on the side close to the laser light source, and the second film layer is located between the substrate and the wavelength conversion layer.

[0012] Furthermore, the first film layer is a blue light anti-reflection film, and the second film layer is a yellow-reflecting blue-transmitting film.

[0013] Furthermore, the blue light anti-reflection film satisfies: AOI = 0-12°, 450-465nm band Tavg>95% (i.e., the average transmittance of light in the 450-465nm band within the incident angle range of 0-12° is greater than 95%); the laser power damage threshold of the film system is>60w / mm 2 .

[0014] Furthermore, the anti-yellow and blue-transmitting film satisfies: AOI=0-12°, Tavg>95% in the 450-465nm band, Ravg>99% in the 480-700nm band (i.e., the average transmittance of light in the 450-465nm band is greater than 95% and the average reflectivity of light in the 480-700nm band is greater than 99% within the incident angle range of 0-12°); AOI=12-60°, Ravg>96% in the 480-700nm band (i.e., the average reflectivity of light in the 480-700nm band is greater than 96% within the incident angle range of 12-60°); the laser power damage resistance threshold of the film system is>60w / mm 2 .

[0015] Furthermore, the thickness of the fluorescent layer is 20-120 μm, and the thickness of the scattering layer is 5-40 μm.

[0016] Furthermore, the first white scattering particles and the second white scattering particles are one or a mixture of several of silicon oxide, titanium oxide, zinc oxide, aluminum oxide, barium sulfate, lithopone, zirconium oxide, polymethyl methacrylate and hollow glass / ceramic microspheres, and the particle size of the first white scattering particles and the second white scattering particles is 10 to 300 nm.

[0017] Furthermore, the first packaging body and the second packaging body are organic silica gel, inorganic glue, or B / Zn / Si / Al / Na / K / O series glass powder with a visible light transmittance of more than 90%.

[0018] Compared with the prior art, the beneficial effects of the present invention are as follows: the present technical solution adopts a transmission-type laser irradiation method, which has a small volume and a compact structure; the present technical solution sets the wavelength conversion layer to include a fluorescent layer and a scattering layer, and the scattering layer is located on the side away from the substrate; the fluorescent layer is designed to be composed of a first package encapsulated by a first package, first fluorescent powder particles and first white scattering particles, and the ratio of the first package, the first fluorescent powder particles and the first white scattering particles is controlled; the scattering layer is designed to be composed of a second package encapsulated by a second package second white scattering particles or a second package encapsulated by a second package second fluorescent powder particles and second white scattering particles, and the composition of the second package, the second white scattering particles, etc. is controlled, so that when the laser is irradiated to the wavelength conversion layer, the distribution of the laser and the stimulated light in the light beam is significantly improved, and a very uniform illumination light is obtained, thereby solving the "yellow aperture problem" that has always plagued the transmission-type laser irradiation method; the laser light source system also has the advantages of compact structure, good uniformity and high illumination. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a simplified structural diagram of the laser light source system of the present invention.

[0020] Figure 2 It is a schematic diagram of the layered structure of the wavelength conversion device 3.

[0021] Figure 3 This is a physical picture of the light beam of Example 1 of the present invention.

[0022] Figure 4 This is a real picture of the light spot on the wall of the light source of Example 1 of the present invention.

[0023] Figure 5 This is a real picture of the light beam of Comparative Example 4.

[0024] Figure 6 This is a real picture of the light spot on the wall of the light source of comparative example 4. DETAILED DESCRIPTION

[0025] The drawings of the present invention are only for illustrative purposes and should not be construed as limiting the present invention. In order to better illustrate the following embodiments, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of the actual product; it is understandable to those skilled in the art that some well-known structures and their descriptions in the drawings may be omitted.

[0026] For simplicity, only some numerical ranges are explicitly disclosed herein. However, any lower limit can be combined with any upper limit to form an unambiguous range; and any lower limit can be combined with other lower limits to form an unambiguous range, and any upper limit can be combined with any other upper limit to form an unambiguous range. In addition, although not explicitly stated, each point or single value between the range endpoints is included in the range. Thus, each point or single value can be combined with any other point or single value as its own lower limit or upper limit or with other lower limits or upper limits to form an unambiguous range.

[0027] In the description of this article, it should be noted that, unless otherwise specified, “above” and “below” are inclusive of the number itself, and the “multiple” in “one or more” means more than two.

[0028] LD laser is the illumination light source of the excitation light source, and the energy of the excitation light is Gaussian distributed: the blue laser energy is high in the center of the light spot, while the blue laser energy is lower in the area away from the center of the light spot, causing the fluorescent light beam generated by the wavelength conversion material to have the following problems: the blue light accounts for a high proportion in the center light irradiated by the laser, while the blue light accounts for a small proportion away from the center, causing the light spot on the wall to appear white / blue in the middle and yellow around it, which is the "yellow aperture" phenomenon, greatly affecting the uniformity of the light spot.

[0029] In response to the problems of "yellow edge and blue center" of the light beam and "yellow aperture" of the light spot on the wall in the laser lighting source, the existing technical solutions include projecting the mixed light beam on the reflective bowl, homogenizing the light in the reflective bowl, and then emitting the light beam. Although this type of solution can greatly improve the problem of "blue center and yellow edge" of the light beam, after the fluorescent light beam is homogenized, the illumination at the center of the light spot is seriously reduced, the irradiation distance of the light source is shortened, and the advantage of the laser light source as a lighting source is lost. In other technical cases, the blue laser in Gaussian form is dispersed into flat-angle light by using light rods, compound eyes and other homogenizing devices, and the excitation blue light is homogenized to achieve uniform distribution of the fluorescent light beam, but at the same time, it also causes serious weakening of the illumination at the center of the light spot and seriously shortens the irradiation distance of the laser light source. There is also a technology that reduces the size of the wavelength conversion material and reduces the wavelength conversion material to a size close to the laser spot size, so that the blue laser is only excited longitudinally, and the lateral excitation is greatly weakened, thereby suppressing the "yellow aperture" phenomenon of the light spot. However, after the size of the wavelength conversion material is reduced, the thermal conductivity and heat dissipation performance of the material deteriorates, which significantly reduces the reliability of the use of the wavelength conversion material. In addition, the coaxiality of the small-sized wavelength conversion material and the laser spot in this light source is difficult to control, and the spot still has color unevenness.

[0030] Based on this, the present application proposes a better technical solution to the "yellow aperture" problem.

[0031] The present application provides a laser light source system, comprising: a laser light source emitting a laser beam, a condenser, a wavelength conversion device and a light collecting mirror sequentially arranged on the path of the laser beam, the condenser converges the laser beam to the wavelength conversion device, the wavelength conversion device converts at least part of the laser beam into converted light, the light collecting mirror collects the converted light and unconverted laser light, and the wavelength conversion device comprises a substrate and a wavelength conversion layer sequentially arranged;

[0032] The wavelength conversion layer includes a fluorescent layer and a scattering layer, and the scattering layer is located on a side away from the substrate. The fluorescent layer is composed of a first package body encapsulating first fluorescent powder particles and first white scattering particles, the mass ratio of the first fluorescent powder particles to the first package body is 2:1 to 20:1, and the mass ratio of the first fluorescent powder particles to the first white scattering particles is 100:1 to 4:1; the scattering layer is composed of a second package body encapsulating second white scattering particles or the second package body encapsulating second fluorescent powder particles and second white scattering particles, the mass ratio of the second white scattering particles to the second package body is 0.1:1 to 2:1, and the mass ratio of the second fluorescent powder particles to the second white scattering particles is (0 to 0.5):1.

[0033] The laser light source system provided by the present application includes a laser light source and a condenser, a wavelength conversion device, and a light collecting mirror which are sequentially arranged on the path of the laser light beam emitted by the laser light source. It is a transmission type laser light source system, so it is very small and has a very compact structure. In order to solve the "yellow aperture" problem, the wavelength conversion layer is specially designed. The wavelength conversion layer includes a fluorescent layer and a scattering layer, and the scattering layer is located on the side away from the substrate. The traditional wavelength conversion device mostly designs the scattering layer between the fluorescent layer and the substrate. The technical solution changes the position of the scattering layer. On the one hand, it will not increase the size of the incident laser spot, thereby ensuring the illumination of the center of the wavelength conversion device spot. On the other hand, such a design is more conducive to breaking up the remaining laser and realizing the beam coupling with the Lambertian laser, thereby improving the problem of the "yellow aperture" of the wall spot on the transmission type laser light source beam. Furthermore, in order to better solve the "yellow aperture" problem, the components of the fluorescent layer and the scattering layer are specially designed. A specific amount of white scattering particles are added to the fluorescent layer, and the ratio of the fluorescent powder particles, the encapsulation body, and the white scattering particles is within a specific range. The ratio of the encapsulation body, the white scattering particles, etc. in the scattering layer is within a specific range, which can completely solve the "yellow aperture" problem.

[0034] Furthermore, the mass ratio of the second white scattering particles to the second encapsulation body is 0.3:1 to 1:1, and the mass ratio of the second phosphor particles to the second white scattering particles is 0.1:1 to 0.3:1. Within this ratio range, the central illumination and spot uniformity of the upper wall spot of the laser light source system are both good.

[0035] In particular, the scattering layer may further include an n-layer structure, and the mass ratio of the second white scattering particles to the second encapsulation body in the first layer to the n-th layer gradually decreases, and the first layer is located on the side of the scattering layer close to the substrate, 2≤n≤10. When the scattering layer adopts a multi-layer structure design and the mass ratio of the second white scattering particles to the second encapsulation body in the first layer to the n-th layer gradually decreases, the diffusion effect of the scattering layer close to the substrate side is better, and the scattering layer far from the scattering substrate side will contribute less to the scattering effect. Even if the thickness of the scattering layer is reduced, the loss of the scattering layer far from the substrate side will not affect the scattering effect too much. Furthermore, the mass ratio of the second white scattering particles to the second encapsulation body in the first layer is 1:1, and the mass ratio of the second white scattering particles to the second encapsulation body in the n-th layer is 0.2:1.

[0036] Furthermore, the mass ratio of the first phosphor particles to the first encapsulation body is 3:1 to 15:1, and more preferably 3:1 to 6:1.

[0037] In particular, the fluorescent layer may also include an m-layer structure, and the mass ratio of the first fluorescent powder particles to the first white scattering particles in the first layer to the m-th layer gradually decreases, and the first layer is located on the side of the scattering layer close to the substrate, 2≤m≤10. When the fluorescent layer adopts a multi-layer structure design and the mass ratio of the first fluorescent powder particles to the first white scattering particles in the first layer to the m-th layer gradually decreases, the brightness of the laser light source is higher, and the central illumination of the upper wall spot of the emitted light is higher. The reason is that the content of fluorescent particles close to the substrate side is high, and the fluorescent particles with a high mass ratio can provide most of the central illumination of the light source spot, so that the illumination of the final emitted light spot can be higher. The first white scattering particles with a certain content in this layer can also disperse the remaining blue light to a certain extent, reducing the pressure of the scattering layer to disperse the blue light. At this time, the thickness of the light scattering layer can be appropriately thinned, the longitudinal heat dissipation path is shortened, the heat exchange performance of the wavelength conversion device is better (the heat conduction and heat dissipation capacity of the particles in the scattering layer is relatively poor relative to the fluorescent layer), the light efficiency thermal attenuation is light, and the reliability of the device is also improved accordingly.

[0038] In any embodiment, the wavelength conversion layer further includes a first film layer for enhancing laser transmittance and a second film layer for transmitting laser and reflecting stimulated light, wherein the first film layer is close to the substrate and located on a side close to the laser light source, and the second film layer is located between the substrate and the wavelength conversion layer. The first film layer can enhance the laser transmittance and enhance the brightness of the laser light source system. The second film layer can reflect the stimulated light, reduce the yellow light loss of the laser light source system, and ensure the illumination of the laser light source system.

[0039] Furthermore, the first film layer is a blue light anti-reflection film, and the blue light anti-reflection film satisfies: AOI = 0 ~ 12 °, 450 ~ 465nm band Tavg> 95%; the film system laser power damage threshold> 60w / mm 2 .

[0040] Furthermore, the second film layer is a yellow-transmitting blue film, which satisfies: AOI = 0-12°, Tavg>95% in the 450-465nm band, Ravg>99% in the 480-700nm band; AOI = 12-60°, Ravg>96% in the 480-700nm band; laser power damage threshold of the film system>60w / mm 2 .

[0041] Furthermore, the blue light anti-reflection film and the yellow-transmitting blue film are attached to the two surfaces of the substrate by using an ion source assisted evaporation coating process.

[0042] Furthermore, the thickness of the fluorescent layer is 20-120 μm, and the thickness of the scattering layer is 5-40 μm. More preferably, the thickness of the fluorescent layer is 30-90 μm, and the thickness of the scattering layer is 8-30 μm.

[0043] In any embodiment, the first white scattering particles and the second white scattering particles are one or a mixture of several of silicon oxide, titanium oxide, zinc oxide, aluminum oxide, barium sulfate, lithopone, zirconium oxide, polymethyl methacrylate and hollow glass / ceramic microspheres, and the particle size of the first white scattering particles and the second white scattering particles is 10 to 300 nm.

[0044] In any embodiment, the first encapsulation body and the second encapsulation body are organic silica gel, inorganic glue, or B / Zn / Si / Al / Na / K / O series glass powder with a visible light transmittance of more than 90%.

[0045] In any embodiment, the substrate is made of a material with a transmittance of more than 80% in the 440-460 nm band, such as sapphire, quartz, and transparent glass with a temperature resistance of more than 500° C., and the thickness of the substrate is 0.5-3 mm.

[0046] In any embodiment, the fluorescent layer and the scattering layer of the wavelength conversion layer are firmly bonded to the second film layer by high-temperature baking and curing or high-temperature sintering, and the overall thickness of the wavelength conversion layer is 25 to 160 um.

[0047] In any embodiment, the fluorescent particles are YAG:Ce of yttrium aluminum garnet system. 3+ Yellow powder, peak wavelength is 540~555mm.

[0048] The following examples describe the disclosure of the present application in more detail, and these examples are intended for illustrative purposes only, as various modifications and variations within the scope of the disclosure of the present application will be apparent to those skilled in the art. Unless otherwise stated, the ratios reported in the following examples are by weight, and all raw materials used in the examples are commercially available or synthesized according to conventional methods and can be used directly without further treatment, and the instruments used in the examples are commercially available. Example 1

[0049] like Figure 1 As shown, a laser light source system comprises: a laser light source 1 emitting a blue laser beam, a condenser 2, a wavelength conversion device 3 and a light collecting mirror 4 arranged in sequence on the path of the laser beam. The condenser 2 converges the laser beam to the wavelength conversion device 3, the wavelength conversion device 3 converts at least part of the laser beam into converted yellow light, and the light collecting mirror 4 collects the converted yellow light and the unconverted laser blue light. The wavelength conversion device 3 comprises a blue light anti-reflection film 33, a substrate 31, an anti-yellow and blue-transmitting film 34 and a wavelength conversion layer 32 arranged in sequence. The wavelength conversion layer 32 comprises a fluorescent layer 321 and a scattering layer 322, and the scattering layer 322 is located on the side away from the substrate 31. The fluorescent layer 321 is composed of a first package encapsulating first fluorescent powder particles and first white scattering particles, the mass ratio of the first fluorescent powder particles to the first package is 3:1, and the mass ratio of the first fluorescent powder particles to the first white scattering particles is 12.5:1; the scattering layer is composed of a second package encapsulating second fluorescent powder particles and second white scattering particles, the mass ratio of the second white scattering particles to the second package is 0.4:1, and the mass ratio of the second fluorescent powder particles to the second white scattering particles is 0.25:1. The thickness of the fluorescent layer is 70-90 μm, and the thickness of the scattering layer is 20-30 μm.

[0050] More specifically, in this embodiment, the first package and the second package are B / Zn / Si / Al / Na / K / O glass powder, the first white scattering particles and the second white scattering particles have a particle size of 10 to 300 nm, and are composed of silicon oxide, titanium oxide, zinc oxide, aluminum oxide, barium sulfate, lithopone, zirconium oxide, polymethyl methacrylate or hollow glass / ceramic microspheres. The first phosphor and the second phosphor are phosphor particles of yttrium aluminum garnet system YAG: Ce3 + yellow powder, with a peak wavelength of 540 to 555 nm.

[0051] More specifically, the substrate in this embodiment is sapphire and has a thickness of about 2 mm.

[0052] More specifically, the blue light anti-reflection film of this embodiment meets the following requirements: AOI = 0-12°, Tavg>95% in the 450-465nm band; laser power damage threshold of the film system>60w / mm 2 The anti-yellow and blue-transmitting film meets the following requirements: AOI = 0-12°, Tavg>95% in the 450-465nm band, Ravg>99% in the 480-700nm band; AOI = 12-60°, Ravg>96% in the 480-700nm band; laser power damage threshold of the film system>60w / mm 2 .

[0053] The working principle of the technical solution is as follows: the laser light source 1 emits a blue laser beam, the condenser 2 collects the blue laser beam and converges it to the wavelength conversion device 3, the wavelength conversion device 3 converts at least part of the blue laser beam into the converted yellow light, and part of the blue laser beam is not converted into the converted light but is scattered, the converted yellow light and the unconverted blue laser are mixed to form illumination light, which is collected by the light collecting mirror 4 and then emitted, wherein the wavelength conversion device 3 includes a blue light anti-reflection film 33, a substrate 31, an anti-yellow and blue-transmitting film 34 and a wavelength conversion layer 32, and the wavelength conversion layer 32 includes a fluorescent layer 32 1 and scattering layer 322, and scattering layer 322 is located on the side away from substrate 31. The laser passes through blue light anti-reflection film 33, substrate 31, anti-yellow blue film 34 and wavelength conversion layer 32 in sequence. The blue light anti-reflection film can increase the transmittance of blue light and improve the brightness of the laser light source system. The anti-yellow blue film 24 can transmit blue light and reflect yellow light, thereby improving the illumination of the laser light source system. For wavelength conversion layer 32, the laser first undergoes wavelength conversion and scattering through fluorescent layer 321, and then further disperses through scattering layer 322, thereby increasing the emission angle of the remaining Gaussian blue light. In particular, scattering layer 322 is arranged on the upper layer of fluorescent layer 321 instead of between fluorescent layer 321 and substrate 31, which will not increase the size of the incident laser spot, thereby ensuring the illumination of the center of the wavelength conversion device spot, and can disperse the remaining blue light, thereby achieving beam coupling with Lambertian laser light, thereby solving the problem of "yellow edge and blue center" of the beam of the transmission laser light source and "yellow aperture" of the spot on the wall. More particularly, the present technical solution designs the fluorescent layer 321 to be composed of a first package body, first phosphor particles and first white scattering particles, and controls the ratio of the first package body, the first phosphor particles and the first white scattering particles; designs the scattering layer 322 to be composed of a second package body encapsulating second white scattering particles or a second package body encapsulating second phosphor particles and second white scattering particles, and controls the composition of the second package body, the second white scattering particles, etc., so that when the laser irradiates the wavelength conversion layer, the distribution of blue light and yellow light in the light beam can be significantly improved, thereby obtaining a very uniform illumination light. Example 2

[0054] like Figure 1As shown, a laser light source system comprises: a laser light source 1 emitting a blue laser beam, a condenser 2, a wavelength conversion device 3 and a light collecting mirror 4 arranged in sequence on the path of the laser beam. The condenser 2 converges the laser beam to the wavelength conversion device 3, the wavelength conversion device 3 converts at least part of the laser beam into converted yellow light, and the light collecting mirror 4 collects the converted yellow light and the unconverted laser blue light. The wavelength conversion device 3 comprises a blue light anti-reflection film 33, a substrate 31, an anti-yellow and blue-transmitting film 34 and a wavelength conversion layer 32 arranged in sequence. The wavelength conversion layer 32 comprises a fluorescent layer 321 and a scattering layer 322, and the scattering layer 322 is located on the side away from the substrate 31. The fluorescent layer 321 is composed of a first package body encapsulating first fluorescent powder particles and first white scattering particles, the mass ratio of the first fluorescent powder particles to the first package body is 6:1, and the mass ratio of the first fluorescent powder particles to the first white scattering particles is 25:1; the scattering layer is composed of a second package body encapsulating second fluorescent powder particles and second white scattering particles, the mass ratio of the second white scattering particles to the second package body is 0.3:1, and the mass ratio of the second fluorescent powder particles to the second white scattering particles is 0.3:1. The thickness of the fluorescent layer is 50-70 μm, and the thickness of the scattering layer is 15-20 μm.

[0055] Except for the wavelength conversion layer, the rest of the structure and materials used in this embodiment 2 are the same as those in embodiment 1, and will not be described again here. Example 3

[0056] like Figure 1 As shown, a laser light source system comprises: a laser light source 1 emitting a blue laser beam, a condenser 2, a wavelength conversion device 3 and a light collecting mirror 4 arranged in sequence on the path of the laser beam. The condenser 2 converges the laser beam to the wavelength conversion device 3, the wavelength conversion device 3 converts at least part of the laser beam into converted yellow light, and the light collecting mirror 4 collects the converted yellow light and the unconverted laser blue light. The wavelength conversion device 3 comprises a blue light anti-reflection film 33, a substrate 31, an anti-yellow and blue-transmitting film 34 and a wavelength conversion layer 32 arranged in sequence. The wavelength conversion layer 32 comprises a fluorescent layer 321 and a scattering layer 322, and the scattering layer 322 is located on the side away from the substrate 31. The fluorescent layer 321 is composed of a first package encapsulating first fluorescent powder particles and first white scattering particles, the mass ratio of the first fluorescent powder particles to the first package is 15:1, and the mass ratio of the first fluorescent powder particles to the first white scattering particles is 50:1; the scattering layer is composed of a second package encapsulating second fluorescent powder particles and second white scattering particles, the mass ratio of the second white scattering particles to the second package is 1:1, and the mass ratio of the second fluorescent powder particles to the second white scattering particles is 0.1:1. The thickness of the fluorescent layer is 30-50 μm, and the thickness of the scattering layer is 8-15 μm.

[0057] Except for the wavelength conversion layer, the rest of the structure and materials used in this embodiment 3 are the same as those in embodiment 1, and will not be described again here. Example 4

[0058] like Figure 1 As shown, a laser light source system comprises: a laser light source 1 emitting a blue laser beam, a condenser 2, a wavelength conversion device 3 and a light collecting mirror 4 arranged in sequence on the path of the laser beam. The condenser 2 converges the laser beam to the wavelength conversion device 3, the wavelength conversion device 3 converts at least part of the laser beam into converted yellow light, and the light collecting mirror 4 collects the converted yellow light and the unconverted laser blue light. The wavelength conversion device 3 comprises a blue light anti-reflection film 33, a substrate 31, an anti-yellow and blue-transmitting film 34 and a wavelength conversion layer 32 arranged in sequence. The wavelength conversion layer 32 comprises a fluorescent layer 321 and a scattering layer 322, and the scattering layer 322 is located on the side away from the substrate 31. The fluorescent layer 321 is composed of a first package body encapsulating first fluorescent powder particles and first white scattering particles, the mass ratio of the first fluorescent powder particles to the first package body is 2:1, and the mass ratio of the first fluorescent powder particles to the first white scattering particles is 4:1; the scattering layer is composed of a second package body encapsulating second fluorescent powder particles and second white scattering particles, the mass ratio of the second white scattering particles to the second package body is 0.1:1, and the mass ratio of the second fluorescent powder particles to the second white scattering particles is 0.5:1. The thickness of the fluorescent layer is 90-120 μm, and the thickness of the scattering layer is 30-40 μm.

[0059] Except for the wavelength conversion layer, the rest of the structure and materials used in this embodiment 4 are the same as those in embodiment 1, and will not be described again here. Example 5

[0060] like Figure 1As shown, a laser light source system comprises: a laser light source 1 emitting a blue laser beam, a condenser 2, a wavelength conversion device 3 and a light collecting mirror 4 arranged in sequence on the path of the laser beam. The condenser 2 converges the laser beam to the wavelength conversion device 3, the wavelength conversion device 3 converts at least part of the laser beam into a converted yellow light, and the light collecting mirror 4 collects the converted yellow light and the unconverted laser blue light. The wavelength conversion device 3 comprises a blue light anti-reflection film 33, a substrate 31, a yellow-transmitting blue film 34 and a wavelength conversion layer 32 arranged in sequence. The wavelength conversion layer 32 comprises a fluorescent layer 321 and a scattering layer 322, and the scattering layer 322 is located on the side away from the substrate 31. The fluorescent layer 321 is composed of a first package encapsulating a first fluorescent powder particle and a first white scattering particle, the mass ratio of the first fluorescent powder particle to the first package is 20:1, and the mass ratio of the first fluorescent powder particle to the first white scattering particle is 100:1; the scattering layer is composed of a second package encapsulating a second white scattering particle, and the mass ratio of the second white scattering particle to the second package is 2:1. The thickness of the fluorescent layer is 20-30 μm, and the thickness of the scattering layer is 5-8 μm.

[0061] Except for the wavelength conversion layer, the rest of the structure and materials used in this embodiment 5 are the same as those in embodiment 1, and will not be described again here. Example 6

[0062] like Figure 1As shown, a laser light source system comprises: a laser light source 1 emitting a blue laser beam, a condenser 2, a wavelength conversion device 3 and a light collecting mirror 4 arranged in sequence on the path of the laser beam. The condenser 2 converges the laser beam to the wavelength conversion device 3, the wavelength conversion device 3 converts at least part of the laser beam into converted yellow light, and the light collecting mirror 4 collects the converted yellow light and the unconverted laser blue light. The wavelength conversion device 3 comprises a blue light anti-reflection film 33, a substrate 31, an anti-yellow and blue-transmitting film 34 and a wavelength conversion layer 32 arranged in sequence. The wavelength conversion layer 32 comprises a fluorescent layer 321 and a scattering layer 322, and the scattering layer 322 is located on the side away from the substrate 31. The fluorescent layer 321 is composed of a first package encapsulating a first fluorescent powder particle and a first white scattering particle. The fluorescent powder includes three layers, which are a first layer, a second layer, and a third layer stacked in sequence. The first layer is located on the side of the fluorescent layer close to the substrate. The mass ratio of the first fluorescent powder particle to the first package in the fluorescent layer is 3:1. In the first layer, the second layer, and the third layer, the mass ratio of the first fluorescent powder particle to the first white scattering particle is 20:1, 12:1, and 8:1, respectively. The total thickness of the fluorescent layer is 70-90 μm. The scattering layer is composed of a second package encapsulating a second fluorescent powder particle and a second white scattering particle. The mass ratio of the second white scattering particle to the second package is 0.4:1, the mass ratio of the second fluorescent powder particle to the second white scattering particle is 0.25:1, and the thickness of the scattering layer is 20-30 μm.

[0063] Except for the wavelength conversion layer, the rest of the structure and materials used in this embodiment 6 are the same as those in embodiment 1, and will not be described again here. Example 7

[0064] like Figure 1As shown, a laser light source system comprises: a laser light source 1 emitting a blue laser beam, a condenser 2, a wavelength conversion device 3 and a light collecting mirror 4 arranged in sequence on the path of the laser beam. The condenser 2 converges the laser beam to the wavelength conversion device 3, the wavelength conversion device 3 converts at least part of the laser beam into converted yellow light, and the light collecting mirror 4 collects the converted yellow light and the unconverted laser blue light. The wavelength conversion device 3 comprises a blue light anti-reflection film 33, a substrate 31, an anti-yellow and blue-transmitting film 34 and a wavelength conversion layer 32 arranged in sequence. The wavelength conversion layer 32 comprises a fluorescent layer 321 and a scattering layer 322, and the scattering layer 322 is located on the side away from the substrate 31. The fluorescent layer 321 is composed of a first package body encapsulating first fluorescent powder particles and first white scattering particles, the mass ratio of the first fluorescent powder particles to the first package body is 3:1, the mass ratio of the first fluorescent powder particles to the first white scattering particles is 12.5:1, and the thickness of the fluorescent layer is 70-90 μm; the scattering layer is composed of a second package body encapsulating second fluorescent powder particles and second white scattering particles, and the scattering layer includes three layers, namely, a first scattering layer, a second scattering layer, and a third scattering layer stacked in sequence, and the first scattering layer is located on the side of the scattering layer close to the substrate. In the first layer, the second layer, and the third layer, the mass ratios of the second white scattering particles to the second package body are 1:1, 0.3:1, and 0.2:1, respectively, the mass ratio of the second fluorescent powder particles to the second white scattering particles is 0.25:1, and the total thickness of the scattering layer is 20-30 μm. Comparative Example 1

[0065] A laser light source system, whose structure is substantially the same as that of Example 1, except that: there are no white scattering particles in the fluorescent layer of this comparative example 1. Comparative Example 2

[0066] A laser light source system has a structure substantially the same as that of Example 1, except that the mass ratio of the first phosphor particles to the first white scattering particles in the fluorescent layer of this comparative example 2 is 2.5:1. Comparative Example 3

[0067] A laser light source system has a structure substantially the same as that of Example 1, except that the mass ratio of the second phosphor particles to the second white scattering particles in the scattering layer of Comparative Example 3 is 0.6:1. Comparative Example 4

[0068] A laser light source system, whose structure is substantially the same as that of Example 1, except that the mass ratio of the second white scattering particles to the second encapsulation body in the scattering layer of this comparative example 4 is 0.05:1.

[0069] The laser light source systems of the above-mentioned embodiments 1 to 7 and comparative examples 1 to 4 were subjected to performance tests. The laser light source system used a blue laser light source with a laser power of 20W and a laser spot size of Φ1mm. The light collecting mirror of the entire laser light source system was a 130mm collimating lens. During the test, the irradiation distance was selected to be 10m, and the fluorescent spot was projected onto a white wall. The test items included: the central illuminance and color temperature of the upper wall spot of the test light source, and the visual observation of the upper wall spot effect and the color uniformity of the light beam. The test results are shown in Table 1.

[0070] Table 1

[0071] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the technical solution of the present invention, and are not intended to limit the specific implementation methods of the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the claims of the present invention shall be included in the protection scope of the claims of the present invention.

Claims

1. A laser light source system, characterized in that: include: A laser light source emitting a laser beam, a condenser, a wavelength conversion device and a light collecting mirror arranged in sequence on the path of the laser beam, the condenser converges the laser beam to the wavelength conversion device, the wavelength conversion device converts at least part of the laser beam into converted light, the light collecting mirror collects the converted light and unconverted laser light, and the wavelength conversion device comprises a substrate and a wavelength conversion layer arranged in sequence; The wavelength conversion layer includes a fluorescent layer and a scattering layer, and the scattering layer is located on a side away from the substrate. The fluorescent layer is composed of a first package body encapsulating first fluorescent powder particles and first white scattering particles, the mass ratio of the first fluorescent powder particles to the first package body is 2:1 to 20:1, and the mass ratio of the first fluorescent powder particles to the first white scattering particles is 100:1 to 4:1; the scattering layer is composed of a second package body encapsulating second white scattering particles or the second package body encapsulating second fluorescent powder particles and second white scattering particles, the mass ratio of the second white scattering particles to the second package body is 0.1:1 to 2:1, and the mass ratio of the second fluorescent powder particles to the second white scattering particles is (0 to 0.5):

1.

2. The laser light source system according to claim 1, characterized in that: The mass ratio of the second white scattering particles to the second encapsulation body is 0.3:1 to 1:1, and the mass ratio of the second phosphor particles to the second white scattering particles is 0.1:1 to 0.3:

1.

3. The laser light source system according to claim 1, characterized in that: The scattering layer comprises an n-layer structure, the mass ratio of the second white scattering particles to the second encapsulation body gradually decreases from the first layer to the nth layer, the first layer is located on a side of the scattering layer close to the substrate, and 2≤n≤10.

4. The laser light source system according to claim 3, characterized in that: The mass ratio of the second white scattering particles to the second encapsulant in the first layer is 1:1, and the mass ratio of the second white scattering particles to the second encapsulant in the nth layer is 0.2:

1.

5. The laser light source system according to claim 1, characterized in that: The mass ratio of the first phosphor particles to the first encapsulation body is 3:1 to 15:

1.

6. The laser light source system according to claim 1, characterized in that: The fluorescent layer comprises an m-layer structure, the mass ratio of the first fluorescent powder particles to the first white scattering particles gradually decreases from the first layer to the m-th layer, the first layer is located on a side of the fluorescent layer close to the substrate, and 2≤m≤10.

7. The laser light source system according to any one of claims 1 to 6, characterized in that: The wavelength conversion layer also includes a first film layer for enhancing laser transmittance and a second film layer for transmitting laser and reflecting stimulated light. The first film layer is closely attached to the substrate and located on a side close to the laser light source, and the second film layer is located between the substrate and the wavelength conversion layer.

8. The laser light source system according to claim 7, characterized in that: The first film layer is a blue light anti-reflection film, and the second film layer is a yellow-reflecting and blue-transmitting film.

9. The laser light source system according to any one of claims 1 to 6, characterized in that: The thickness of the fluorescent layer is 20-120 μm, and the thickness of the scattering layer is 5-40 μm.

10. The laser light source system according to any one of claims 1 to 6, characterized in that: The first white scattering particles and the second white scattering particles are one or a mixture of several of silicon oxide, titanium oxide, zinc oxide, aluminum oxide, barium sulfate, lithopone, zirconium oxide, polymethyl methacrylate and hollow glass / ceramic microspheres, and the particle size of the first white scattering particles and the second white scattering particles is 10 to 300 nm; and / or the first encapsulation body and the second encapsulation body are organic silica gel, inorganic glue, or B / Zn / Si / Al / Na / K / O glass powder with a visible light transmittance of more than 90%.

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