WO2019000674A1

WO2019000674A1 - Wavelength conversion device and light source system

Info

Publication number: WO2019000674A1
Application number: PCT/CN2017/103441
Authority: WO
Inventors: 戴达炎; 李屹
Original assignee: 深圳市光峰光电技术有限公司
Priority date: 2017-06-29
Filing date: 2017-09-26
Publication date: 2019-01-03
Also published as: CN206946178U

Abstract

A wavelength conversion device (120), comprising a substrate (124) and a wavelength conversion layer (122) used for converting part of excitation light into excited light. The substrate (124) and the wavelength conversion layer (122) are stacked, and the wavelength conversion layer (122) is provided with a light scattering aggregate (121a). The light scattering aggregate (121a) may homogenize the energy of excitation light spots irradiated thereon, thereby improving the conversion efficiency of the wavelength conversion layer (122) and prolonging the service life of the wavelength conversion layer (122).

Description

Wavelength conversion device and light source system

Technical field

The utility model relates to the field of optical technology, in particular to a wavelength conversion device and a light source system.

Background technique

This section is intended to provide a context or context for the specific embodiments of the invention set forth in the claims. The description herein is not admitted to be prior art as it is included in this section.

At present, laser phosphor technology has developed rapidly and has been widely used. Laser phosphor technology, which uses a laser beam to excite phosphors to produce fluorescence, usually using a blue laser as the excitation light. In the visible range, the photon energy will change negatively with the wavelength. The shorter the wavelength, the larger the photon energy. Therefore, when the phosphor is excited by the short-wavelength blue laser, the higher-energy blue laser photon will be phosphor. The material absorbs and releases long-wavelength fluorescent photons with lower energy.

technical problem

Laser fluorescence produces high brightness and can be used as a light source for many applications such as illumination, display or projection. The brightness of the phosphor excited by the laser is related to a number of factors, such as the power of the excitation light, the spot energy distribution of the excitation light, the heat dissipation capability of the phosphor material and the color wheel assembly, and the like. Under the same excitation light power, whether the energy distribution of the imaging surface of the excitation light is uniform will directly affect the light conversion efficiency of the phosphor.

Technical solution

In view of the above, the present invention provides a wavelength conversion device and a light source system capable of homogenizing the energy of an excitation light spot.

A wavelength conversion device includes a substrate and a wavelength conversion layer for converting a portion of the excitation light into a laser light, the substrate and the wavelength conversion layer being stacked, the wavelength conversion layer being provided with light scattering particles.

Further, the light scattering granules comprise particles for scattering and refracting the excitation light having a particle size of less than 100 nm.

Further, the light scattering particles are nano silica particles.

Further, the light scattering particles cover a surface of the wavelength conversion layer and form a scattering layer.

Further, the scattering layer is fixed to an excitation light irradiation region of the light incident surface of the wavelength conversion layer.

Further, the wavelength conversion layer includes a binder, the light scattering pellets, and phosphor particles for converting the excitation light into a laser light.

Further, the wavelength conversion device further includes a reflective layer for reflecting the laser light and a portion of the excitation light that is not converted.

Further, a driving device that drives the rotation of the substrate is fixed to a bottom of the substrate.

A light source system comprising an excitation light source, a light combining and illuminating device, and the wavelength conversion device according to any one of the above

The excitation light source is for generating excitation light;

The light combining and combining device directs the excitation light to the wavelength conversion device;

The wavelength conversion device converts part of the excitation light into a laser light, and the laser light and the unconverted partial excitation light are emitted from the wavelength conversion device and then projected to the light combining and combining device;

The beam splitting device is further configured to combine the laser-receiving and the unconverted partial excitation light into the same optical path.

Further, the light combining and illuminating device includes a light splitting region and a light combining region disposed at an edge of the light splitting region, the light splitting region is configured to reflect the excitation light and transmit the laser light, and the light combining region is used for The excitation light and the received laser light are transmitted.

Beneficial effect

In the wavelength conversion device and the light source system provided by the present invention, the wavelength conversion device includes light scattering particles, and the light scattering particles scatter and refract the excitation light irradiated thereon to make the illumination The excitation light spot on the wavelength conversion layer becomes large, and the energy is uniform, so that the power density of the excitation light spot irradiated on the wavelength conversion layer becomes small, thereby improving the conversion efficiency of the wavelength conversion layer, and attenuating the excitation light. Damage to the wavelength conversion layer extends the lifetime of the wavelength conversion layer.

DRAWINGS

1 is a schematic structural view of a light source system provided in a first embodiment of the present invention.

2 is a schematic top plan view of the optical splitting device shown in FIG. 1.

3 is a schematic structural view of a light source system provided in a second embodiment of the present invention.

4 is a schematic structural view of a light source system provided in a third embodiment of the present invention.

FIG. 5 is a schematic structural view of a light source system according to a fourth embodiment of the present invention.

光源系统 Light source system	100 、 200 、 300 、 400 100, 200, 300, 400
激发光源 Excitation source	101 、 301 、 401 101, 301, 401
会聚透镜 Converging lens	102 、 104 、 302 、 305 102, 104, 302, 305
分光合光装置 Optical splitting device	103 、 303 103, 303
分光区域 Spectroscopic area	103a 103a
合光区域 Blending area	103b 103b
波长转换装置 Wavelength conversion device	120 、 220 、 320 、 420 120, 220, 320, 420
散射层 Scattering layer	121 、 321 121, 321
纳米二氧化硅颗粒 Nano silica particles	121a 、 222b 、 321a 、 422b 121a, 222b, 321a, 422b
波长转换层 Wavelength conversion layer	122 、 222 、 322 、 422 122, 222, 322, 422
荧光粉颗粒 Phosphor particles	122a 、 222a 、 422a 122a, 222a, 422a
反射层 Reflective layer	123 、 223 123, 223
基板 Substrate	124 、 224 、 324 、 424 124, 224, 324, 424
驱动装置 Drive unit	125 、 225 、 325 、 425 125, 225, 325, 425

The present invention will be further described in conjunction with the above drawings in the following detailed description.

BEST MODE FOR CARRYING OUT THE INVENTION

The technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the drawings in the embodiments of the present invention. It is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. example. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative efforts are within the scope of the present invention. The features of the embodiments and examples described below can be combined with each other without conflict.

It should be noted that in the present invention, when one component is considered to be "connected" to another component, it may be directly connected to another component or may be indirectly connected to another component through the centering component.

All technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to the invention. The terminology used in the description of the present invention is for the purpose of describing particular embodiments and is not intended to limit the invention.

Please refer to FIG. 1. FIG. 1 is a schematic structural view of a light source system 100 according to a first embodiment of the present invention. The light source system 100 includes an excitation light source 101, a condenser lens 102, a condenser lens 104, a beam splitting device 103, and a wavelength conversion device 120.

Specifically, the excitation light source 101 is used to generate excitation light. The excitation light source 101 may be disposed at one side of the wavelength conversion device 120. Further, the excitation light source 101 may be a blue light source that emits blue light excitation light. It can be understood that the excitation light source 101 is not limited to the blue light source, and the excitation light source 101 may also be a violet light source, a red light source or a green light source. In this embodiment, the excitation light source 101 includes a blue laser for emitting blue laser light as the excitation light. It can be understood that the excitation light source 101 may include one, two or more blue lasers, and the number of lasers may be Choose according to actual needs.

The condenser lens 102 and the condenser lens 104 are positioned on the optical path of the excitation light and converge the excitation light. It is to be understood that the converging lens 102 and the converging lens 104 may include at least one of a lenticular lens, a plano-convex lens, or a meniscus lens.

In this embodiment, the wavelength conversion device 120 includes a scattering layer 121, a wavelength conversion layer 122, a reflective layer 123, and a substrate 124 which are sequentially disposed from top to bottom. The driving device 125 is disposed at the center of the bottom of the substrate 124 and drives the wavelength conversion device 120 to periodically move. The wavelength conversion device 120 rotates at a high speed with the driving device 125 as an axis.

Specifically, the scattering layer 121 is made of light-scattering pellets. The light-scattering pellets include particles for scattering and refracting the excitation light having a particle diameter of less than 100 nm, the particles being nano-silica particles 121a having light-transmitting properties. The nano-silica particles 121a in the scattering layer 121 scatter, refract, and diffract the excitation light irradiated thereon, so that the excitation light spot irradiated on the wavelength conversion layer 122 becomes large, and the energy is uniform, so that the irradiation is in wavelength conversion. The excitation light spot power density of the layer 122 becomes small, thereby improving the conversion efficiency of the wavelength conversion layer 122, weakening the damage of the excitation light to the wavelength conversion layer 122, and prolonging the lifetime of the wavelength conversion layer 122. In addition, the scattering layer 121 made of the nano silica particles 121a has good high temperature resistance and enhances the adhesion of the scattering layer 121. It will be appreciated that the light scattering granules may also comprise titanium dioxide or aluminum oxide. Among them, titanium dioxide has light scattering properties, is chemically inert, and can withstand the high temperature reached during lamp operation; alumina allows light to be uniformly dispersed in the scattering layer 121 to achieve a soft light effect, while zinc oxide particles are transparent materials, which are increasing The light scattering effect ensures a high light transmission rate.

In this embodiment, the scattering layer 121 covers the surface of the wavelength conversion layer 122. It can be understood that in other embodiments, the scattering layer 121 may be fixed only to the surface of the wavelength conversion layer 122. .

The wavelength conversion layer 122 is provided with a wavelength conversion material. In the embodiment, the wavelength conversion material is phosphor particles 122a, and the wavelength conversion layer 122 can be coated with phosphor particles 122a of different colors in sections, on each segment. The phosphor particles 122a receive a portion of the excitation light and emit a laser light of a corresponding color. Wherein the laser received by the laser comprises at least two different colors of light, each segment corresponding to emitting a color of the laser. In this embodiment, the wavelength conversion layer 122 is provided with a red phosphor and a green phosphor to respectively emit a red laser and a green laser. In another preferred embodiment, the wavelength conversion layer 122 may be provided with only a yellow phosphor to generate a yellow The laser light is filtered by the laser through the filter to obtain a laser of a specific wavelength, for example, a red laser and a green laser are obtained after filtering.

The wavelength conversion device 120 is a reflective wavelength conversion device, such as a reflective color wheel, which includes a reflective layer 123. In this embodiment, the reflective layer 123 is configured to diffusely reflect the laser light and the partially converted excitation light. It is to be understood that the reflective layer 123 may be made of a diffuse reflective material such as silica gel, ceramics or the like containing scattering particles.

The substrate 124 is used to carry other components in the wavelength conversion device 120, and may be made of a specular reflective material such as high reflectivity metal such as high anti-aluminum or silver. The wavelength conversion device 120 is a reflective wavelength conversion device and has the advantage of sufficient heat dissipation space. It can be understood that the substrate 124 can be provided with a heat dissipation component to further improve the heat dissipation effect of the wavelength conversion device 120; the heat dissipation component can be disposed on a surface of the substrate 124 facing away from the wavelength conversion layer 122; the heat dissipation component 126 can be a heat dissipation blade. The shape of the heat dissipating fins may be a circular ring, a columnar protrusion, a sheet-like protrusion or the like distributed along the circumference.

The spot light irradiated onto the wavelength conversion device 120 is Gaussian, and after the scattering layer 121 scatters, refracts and diffracts the excitation light to obtain excitation light having uniform energy distribution, the wavelength conversion layer 122 partially excites the excitation. The light is converted into a laser light, and the laser light and the unconverted partial excitation light are reflected from the reflective layer 123 and then projected to the light combining and combining device 103.

Please refer to FIG. 2 in conjunction with FIG. 1. FIG. 2 is a schematic top plan view of the optical splitting device 103 shown in FIG. The optical splitting device 103 and the excitation light source 101 may be disposed on the same side of the wavelength conversion device 120, and the optical splitting device 103 is positioned on the optical path of the excitation light, and guides the excitation light to the wavelength conversion device 120. The optical splitting device 103 also combines the laser light generated by the wavelength conversion device 120 and the partially converted excitation light that is not converted into the same optical path.

Specifically, the optical splitting device 103 includes a light splitting region 103a for reflecting the excitation light and transmitting the laser light, and a light combining region 103b for transmitting the excitation light and the laser light. In this embodiment, the excitation light is blue excitation light, the received laser light includes a red received laser light and a green received laser light, and the light splitting region 103a is disposed at an intermediate position of the light splitting and combining device 103, and reflects the blue excitation light to transmit red light. The laser light and the green light receiving light are combined, and the light combining region 103b is disposed at an edge position of the light combining and combining device 103, and transmits a red light receiving laser, a green light receiving laser, and an unconverted blue excitation light.

Referring to FIG. 1 again in conjunction with FIG. 2, it can be understood that the light source system 100 can further include a light homogenizing device to homogenize the laser light and the unconverted partial excitation light to be emitted to the subsequent optical system. The light-shaping device may include a fly-eye lens, a light-dancing rod or a diffusing film, and the like, and is not limited thereto.

In this embodiment, the excitation light source 101 generates blue excitation light, and the optical splitting device 103 reflects the blue excitation light to the wavelength conversion device 120. The scattering layer 121 scatters, refracts, and diffracts the excitation light to obtain energy. After distributing the uniform excitation light, the wavelength conversion layer 122 converts part of the blue excitation light into the red laser and the green laser, the red laser and the green laser and the unconverted blue The excitation light is reflected from the reflection layer 123 and then emitted from the light incident side of the wavelength conversion device 120. The optical splitting device 103 combines the red-receiving laser light with the green-receiving laser light and the unconverted partial blue excitation light into the same optical path.

The nano-silica particles 121a in the scattering layer 121 in the wavelength conversion device 120 scatter, refract, and diffract the excitation light irradiated thereon, so that the excitation light spot irradiated on the wavelength conversion layer 122 becomes large, and the energy is uniform. Thus, the excitation light spot power density of the wavelength conversion layer 122 is reduced, thereby improving the conversion efficiency of the wavelength conversion layer 122, weakening the damage of the excitation light to the wavelength conversion layer 122, and prolonging the lifetime of the wavelength conversion layer 122. In addition, the scattering layer 121 made of the nano silica particles 121a has good high temperature resistance and enhances the adhesion of the scattering layer 121.

Please refer to FIG. 3. FIG. 3 is a schematic structural diagram of a wavelength conversion device 200 according to a second embodiment of the present invention. The main difference between the light source system 200 and the light source system 100 in the first embodiment is that the structure of the wavelength conversion device 220 is changed from that of the wavelength conversion device 120.

Specifically, the wavelength conversion device 220 includes a wavelength conversion layer 222, a reflective layer 223, and a substrate 224 that are sequentially disposed from top to bottom. The driving device 225 is disposed at the center of the bottom of the substrate 224 and drives the wavelength conversion device 220 to periodically move. The wavelength conversion device 220 rotates at a high speed with the driving device 125 as an axis.

The wavelength conversion layer 222 includes a sheet formed by bonding together an adhesive, light-scattering pellets, and phosphor particles 222a for converting the excitation light into a laser. The light-scattering pellets are the same as the light-scattering pellets in the first embodiment, and are nano-silica particles 222b. In this embodiment, the nano-silica particles 222b are densely distributed in the excitation light irradiation region in the wavelength conversion layer 222, and the farther away from the excitation light irradiation region in the wavelength conversion layer 222, the thinner the distribution of the nano-silica particles 222b is. In order to achieve scattering, refracting and diffractive effects on the incident excitation light, the purpose of homogenizing the spot energy of the excitation light is achieved. It can be understood that in other embodiments, the light scattering particles may also be uniformly distributed in the wavelength conversion layer 222.

The structure and function of the reflective layer 223, the substrate 224, and the driving device 225 are the same as those of the reflective layer 123, the substrate 124, and the driving device 125 in the first embodiment, and will not be described again.

The nano-silica particles 222b in the wavelength conversion device 220 scatter, refract, and diffract the excitation light irradiated thereon, so that the excitation light energy irradiated on the wavelength conversion layer 222 is uniform, thereby improving the conversion of the wavelength conversion layer 222. The efficiency is reduced, the damage of the excitation light to the wavelength conversion layer 222 is weakened, and the lifetime of the wavelength conversion layer 222 is prolonged. In addition, the wavelength conversion layer 222 made of the nano silica particles 222b has good high temperature resistance and enhances the adhesion of the wavelength conversion layer 222. The wavelength conversion device 220 has a simpler structure, takes up less space, and saves cost, and improves the market competitiveness of the light source system 200 and the projection device using the light source system 200.

Please refer to FIG. 4. FIG. 4 is a schematic structural view of a light source system 300 according to a third embodiment of the present invention. The light source system 300 in this embodiment is compared with the light source system 100 in the first embodiment. The main difference is that the wavelength conversion device 320 in the light source system 300 is a transmissive wavelength conversion device, and the wavelength conversion device 120 is a reflective wavelength conversion device. And a reflective layer 123 is provided.

In this embodiment, the wavelength conversion device 320 includes a scattering layer 321 , a wavelength conversion layer 322 , and a substrate 324 that are sequentially disposed from top to bottom. The substrate 324 is transparent and has a high light transmittance in the visible light region and the ultraviolet light region. The driving device 325 is disposed at the center of the bottom of the substrate 324 and drives the wavelength conversion device 320 to periodically move. The wavelength conversion device 320 rotates at a high speed with the driving device 325 as an axis. The scattering layer 321 and the wavelength conversion layer 322 in this embodiment are the same as the scattering layer 121 and the wavelength conversion layer 122 in the first embodiment, and are not described herein.

The light source 301 is used to generate excitation light, which is projected by the convergence lens 302 and then projected to the beam splitting and combining device 303. In this embodiment, the light combining and combining device 303 is a mirror for reflecting the excitation light and the wavelength conversion device. 320 generated by the laser. The excitation light is transmitted to the wavelength conversion device 320 via the condenser lens 304 under the guidance of the spectroscopic unit 303.

The splitting and combining device 303 guides the excitation light to the light incident surface of the wavelength conversion device 320, and the scattering layer 321 provided with the nano silica particles 321a scatters, refracts, and diffracts the excitation light irradiated thereon, thereby The excitation light spot irradiated on the wavelength conversion layer 122 becomes large, and the energy is uniform, so that the power density of the excitation light spot irradiated on the wavelength conversion layer 122 becomes small, thereby improving the conversion efficiency of the wavelength conversion layer 122, and attenuating the excitation light to the wavelength. The damage of the conversion layer 122 extends the lifetime of the wavelength conversion layer 122. In addition, the scattering layer 121 made of the nano silica particles 121a has good high temperature resistance and enhances the adhesion of the scattering layer 121. A wavelength conversion material is disposed in the wavelength conversion layer 322. In the embodiment, the wavelength conversion material is phosphor particles 322a. The excitation light emitted from the scattering layer 321 excites the wavelength conversion material in the wavelength conversion layer 322 to obtain a laser light of at least one color, and the laser light is emitted from the light emitting surface of the wavelength conversion device 320 through the transparent substrate 324, and the light emitting surface is The light incident surfaces are oppositely disposed. The laser light emitted by the wavelength conversion device 320 is concentrated by the converging lens 305 and then projected to a subsequent homogenizing device or optical system.

The nano-silica particles 321a in the scattering layer 321 in the wavelength conversion device 320 scatter, refract, and diffract the excitation light irradiated thereon, so that the excitation light spot irradiated on the wavelength conversion layer 322 becomes large, and the energy is uniform. Thus, the excitation light spot power density of the wavelength conversion layer 322 is reduced, thereby improving the conversion efficiency of the wavelength conversion layer 322, weakening the damage of the excitation light to the wavelength conversion layer 322, and prolonging the lifetime of the wavelength conversion layer 322. In addition, the scattering layer 121 made of the nano silica particles 121a has good high temperature resistance and enhances the adhesion of the scattering layer 121.

Please refer to FIG. 5. FIG. 5 is a schematic structural diagram of a light source system 400 according to a fourth embodiment of the present invention. The light source system 400 in this embodiment is compared with the light source system 200 in the second embodiment. The main difference is that the wavelength conversion device 420 in the light source system 400 is a transmissive wavelength conversion device, and the wavelength conversion device 220 is a reflective wavelength conversion device. And a reflective layer 223 is provided.

In the present embodiment, the wavelength conversion device 420 includes a wavelength conversion layer 422 and a substrate 424 which are stacked. The substrate 424 is transparent and has a high light transmittance in the visible light region and the ultraviolet light region. The driving device 425 is disposed at the center of the bottom of the substrate 424 and drives the wavelength conversion device 420 to periodically move. The wavelength conversion device 420 rotates at a high speed with the driving device 425 as an axis. The wavelength conversion layer 422 is the same as the wavelength conversion layer 222 in the second embodiment, and is not described herein.

The light source 401 is for generating excitation light that is projected by the converging lens 402 and then projected to the spectroscopic unit 403. In this embodiment, the optical splitting unit 403 is a mirror for reflecting the excitation light and the received laser light generated by the wavelength conversion device 420. The excitation light is transmitted to the wavelength conversion device 320 via the condenser lens 404 under the guidance of the light combining and combining device 403.

The optical splitting device 403 directs the excitation light to a light incident surface of the wavelength conversion device 320, and the wavelength conversion layer 422 includes an adhesive, light scattering particles, and phosphor particles for converting the excitation light into a laser beam. The 422a is bonded together to form a sheet. The light scattering granules are nano SiO particles 422b. The nano-silica particles 422b scatter, refract, and diffract the incident excitation light to homogenize the spot energy of the excitation light. The excitation light scattered by the nano silica particles 422b excites the phosphor particles 422a to generate a laser light of at least one color. The laser-receiving substrate 424 is emitted from the light-emitting surface of the wavelength conversion device 420, and the light-emitting surface is disposed opposite to the light-incident surface. The laser light emitted by the wavelength conversion device 420 is concentrated by the converging lens 405 and projected to a subsequent homogenizing device or optical system.

The nano-silica particles 422b in the wavelength conversion device 420 scatter, refract, and diffract the excitation light irradiated thereon, so that the excitation light energy irradiated on the wavelength conversion layer 422 is uniform, thereby improving the conversion of the wavelength conversion layer 422. The efficiency, the damage of the excitation light to the wavelength conversion layer 422 is weakened, and the lifetime of the wavelength conversion layer 422 is prolonged. In addition, the wavelength conversion layer 422 made of the nano silica particles 422b has good high temperature resistance and enhances the adhesion of the wavelength conversion layer 422. The wavelength conversion device 420 has a simpler structure, takes up less space, and saves cost, and improves the market competitiveness of the light source system 400 and the projection device using the light source system 200.

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 wavelength conversion device comprising a substrate and a wavelength conversion layer for converting part of the excitation light into a laser light, wherein the substrate is laminated with the wavelength conversion layer, and the wavelength conversion layer is provided with light Scattering pellets.

2. A wavelength conversion device according to claim 1 wherein said light scattering granules comprise particles for scattering and refracting said excitation light having a particle size of less than 100 nanometers.

3. A wavelength conversion device according to claim 1 wherein the light scattering particles are nanosilica particles.

The wavelength conversion device according to claim 2, wherein the light scattering particles cover a surface of the wavelength conversion layer and form a scattering layer.

The wavelength conversion device according to claim 4, wherein the scattering layer is fixed to an excitation light irradiation region of the light incident surface of the wavelength conversion layer.

The wavelength conversion device according to claim 1, wherein the wavelength conversion layer comprises a binder, the light scattering pellets, and phosphor particles for converting the excitation light into a laser light.

7. The wavelength conversion device of claim 1, wherein the wavelength conversion device further comprises a reflective layer for reflecting the laser light and a portion of the excitation light that is not converted.

The wavelength conversion device according to claim 1, wherein a driving device that drives rotation of the substrate is fixed to a bottom portion of the substrate.

A light source system comprising an excitation light source, a spectroscopic unit, and the wavelength conversion device according to any one of claims 1-8,

The excitation light source is for generating excitation light;

The light source system according to claim 9, wherein the spectroscopic unit comprises a light splitting region and a light combining region disposed at an edge of the light splitting region, wherein the light splitting region is configured to reflect the excitation light and The laser light is transmitted, and the light combining region is for transmitting the excitation light and the laser light.