CN106969305B - Adjustable light source device and lighting device - Google Patents
Adjustable light source device and lighting device Download PDFInfo
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- CN106969305B CN106969305B CN201610023770.7A CN201610023770A CN106969305B CN 106969305 B CN106969305 B CN 106969305B CN 201610023770 A CN201610023770 A CN 201610023770A CN 106969305 B CN106969305 B CN 106969305B
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- light
- light source
- scattering particles
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- wavelength conversion
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
- F21V9/00—Elements for modifying spectral properties, polarisation or intensity of the light emitted, e.g. filters
- F21V9/30—Elements containing photoluminescent material distinct from or spaced from the light source
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
- F21S43/00—Signalling devices specially adapted for vehicle exteriors, e.g. brake lamps, direction indicator lights or reversing lights
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
- F21V14/00—Controlling the distribution of the light emitted by adjustment of elements
- F21V14/02—Controlling the distribution of the light emitted by adjustment of elements by movement of light sources
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21W—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO USES OR APPLICATIONS OF LIGHTING DEVICES OR SYSTEMS
- F21W2107/00—Use or application of lighting devices on or in particular types of vehicles
- F21W2107/10—Use or application of lighting devices on or in particular types of vehicles for land vehicles
Abstract
The invention protects an adjustable light source device, which comprises a blue light source and a wavelength conversion device, wherein light emitted by the blue light source is incident on the wavelength conversion device, the wavelength conversion device comprises a light emitting layer and a reflecting layer, the light emitting layer comprises fluorescent powder, high-refraction scattering particles, low-refraction scattering particles and a bonding material, the light emitting layer comprises a first area and a second area, the volume ratio of the high-refraction scattering particles and the low-refraction scattering particles in the first area is larger than that of the high-refraction scattering particles in the second area, the adjustable light source device also comprises an adjusting device for adjusting to enable the light emitted by the blue light source to be incident on the first area or the second area, the wavelength conversion device emits first emergent light when the light emitted by the blue light source irradiates the first area, the wavelength conversion device emits second emergent light when the light emitted by the blue light source irradiates the second area, and the color temperature of the first emergent light, thereby changing the color temperature of the outgoing light without affecting the brightness of the outgoing light.
Description
Technical Field
The invention relates to the field of illumination, in particular to an adjustable light source device and an illumination device.
Background
At present, in the fields of illumination, projection and the like, the requirement of high brightness and the like is difficult to meet by obtaining white light through a bulb, and the technical scheme of obtaining white light by utilizing a semiconductor light source is increasingly popularized. Since white light is a broad spectrum light, it cannot be obtained by directly using semiconductor light emission, so there are two main ways of generating white light by using semiconductors. One is to cover fluorescent powder on the light-emitting surface of a blue light semiconductor, utilize a blue light semiconductor light-emitting device to excite the fluorescent powder, and utilize the combination of yellow light generated by excitation and blue light which is not absorbed to generate white light; the other mode is that the blue light is divided into two light paths, yellow light generated by the blue light excited fluorescent powder and blue light emitted by the blue light semiconductor are respectively obtained, and the light paths are utilized for light combination. The former needs to adjust the color temperature of the emergent light white light by adjusting the content of the fluorescent powder, and although the color temperature can be adjusted in a wide range, the brightness difference between the two is too large; the latter needs to combine light by means of light path, and the optical system is large and complex.
Disclosure of Invention
Aiming at the defect that the color temperature of white light in the prior art is difficult to adjust, the invention provides an adjustable light source device under the condition of not influencing the brightness of emergent light, which comprises the following steps:
the LED light source comprises a blue light source and a wavelength conversion device, wherein light emitted by the blue light source is incident on the wavelength conversion device, the wavelength conversion device comprises a light emitting layer and a reflecting layer, the reflecting layer is positioned on the surface of the light emitting layer far away from the light incident side, and the light emitting layer comprises fluorescent powder, high-refraction scattering particles, low-refraction scattering particles and a bonding material; the light-emitting layer comprises a first area and a second area, and the volume ratio of the high-refraction scattering particles to the low-refraction scattering particles in the first area is larger than that of the high-refraction scattering particles to the low-refraction scattering particles in the second area; the adjusting device is used for adjusting the incidence of the light emitted by the blue light source to the first area or the second area; the wavelength conversion device emits first emergent light when the light emitted by the blue light source irradiates the first area, the wavelength conversion device emits second emergent light when the light emitted by the blue light source irradiates the second area, and the color temperature of the first emergent light is higher than that of the second emergent light.
Preferably, the phosphor in the first region is the same as the phosphor in the second region.
Preferably, the volume fraction of the phosphor in the first region is the same as the volume fraction of the phosphor in the second region.
Preferably, the phosphor is a yellow phosphor.
Preferably, the refractive index of the high refractive scattering particles is greater than 1.8, and the refractive index of the low refractive scattering particles is less than 1.8 and greater than 1.6.
Preferably, the high-refraction scattering particles comprise at least one of titanium oxide, zirconium oxide and zinc oxide, and the low-refraction scattering particles comprise at least one of aluminum oxide, yttrium oxide and barium sulfate.
Preferably, the refractive index of the bonding material is less than 1.6, and the bonding material comprises one of organic silica gel, epoxy resin and glass powder.
Preferably, the LED lamp further comprises a heat conducting substrate, wherein the heat conducting substrate is positioned on the surface of the reflecting layer far away from the light emitting layer.
The invention also provides a lighting device which comprises the light source device.
Preferably, the lighting device is an automotive lamp.
Compared with the prior art, the invention has the following beneficial effects:
the first area and the second area with different volume ratios of high-low refraction scattering particles are arranged on the light emitting layer of the wavelength conversion device, the wavelength conversion device is irradiated by the blue light source and is adjusted by the adjusting device, first emergent light with high color temperature is emitted when the first area is irradiated, second emergent light with low color temperature is emitted when the second area is irradiated, the color temperature of the emergent light changes along with the volume ratio of the high-low refraction scattering particles in the wavelength conversion device, the volume fraction of fluorescent powder is not changed, and the defect that the brightness of the emergent light changes due to the fact that the color temperature is adjusted in the prior art is overcome.
Drawings
Fig. 1 is a schematic structural diagram of a light source device according to a first embodiment of the invention.
Detailed Description
The light emitting layer of the wavelength conversion device simultaneously contains fluorescent powder, high-refraction scattering particles, low-refraction scattering particles and a bonding material, and the color temperature of emergent light is adjusted by using the volume ratio of the high-refraction scattering particles to the low-refraction scattering particles.
Generally, the larger the difference between the refractive indexes of the scattering particles and the surrounding medium, the stronger the refraction effect on the light, and thus the shallower the depth of the light entering the light emitting layer after the light is incident on the light emitting layer, that is, the shallower the excitation depth of the excitation light in the light emitting layer. Compared with the invention, the more high-refraction scattering particles in the light-emitting layer, the shallower the depth of the blue light entering the light-emitting layer of the wavelength conversion layer, the less the light-emitting layer absorbs the blue light, and more blue light is reflected out of the light-emitting layer, so that the proportion of the blue light in the final emergent light is larger, and the color temperature of the obtained white light is larger.
Since the medium is more refractive to short wavelength light, the volume ratio of the high and low refractive scattering particles is significantly more influential than the blue light than the yellow light. In the outgoing white light, the influence of blue light on the color temperature is large, and the influence of yellow light on the brightness is large. Therefore, by adjusting the volume ratio of the high-low refraction scattering particles, the color temperature of the emergent light can be adjusted under the condition of not obviously changing the brightness of the emergent light, and the defect of brightness change caused by adjusting fluorescent powder in the prior art is avoided.
The embodiments of the present invention will be described in detail below with reference to the drawings and the embodiments.
Referring to fig. 1, fig. 1 is a schematic structural diagram of a light source device according to a first embodiment of the invention. As shown in the figure, the light source device includes a blue light source 200 and a wavelength conversion device 100, light emitted from the blue light source 200 is incident on the wavelength conversion device 100, and the wavelength conversion device 100 includes a light emitting layer 110 and a reflective layer 120, wherein the reflective layer 120 is located on a surface of the light emitting layer 110 away from a light incident side.
In this embodiment, the light emitting layer 110 is composed of materials such as phosphor, high-refraction scattering particles, low-refraction scattering particles, and bonding material, and the light emitting layer 110 includes two regions: a first region 111 and a second region 112. Wherein the volume ratio of the high-refraction scattering particles to the low-refraction scattering particles of the first region 111 is greater than the volume ratio of the high-refraction scattering particles to the low-refraction scattering particles of the second region 112.
In this embodiment, the light source device further includes a regulating device (not shown in the figure) for regulating the light emitted from the blue light source 200 to be incident on the first region 111 or the second region 112. When the light emitted by the blue light source irradiates the first area, the wavelength conversion device emits first emergent light, and when the light emitted by the blue light source irradiates the second area, the wavelength conversion device emits second emergent light, wherein the color temperature of the first emergent light is higher than that of the second emergent light. The adjusting means may be means for driving and moving the wavelength conversion device 100 and/or the blue light source 200; or may be an adjustable optical device (e.g., an adjustable mirror) positioned between the blue light source 200 and the wavelength conversion device 100.
In the present embodiment, the phosphors in the first region 111 and the second region 112 are the same phosphor, so when the blue light source irradiates the first region 111 and the second region 112 respectively, there is not much difference in the color of the emitted light. In this embodiment, the phosphors in the first region 111 and the second region 112 are yellow phosphors, such as YAG phosphors, and yellow light emitted by the phosphors may be combined with blue light emitted by a blue light source to form white light.
In the present embodiment, the volume fractions of the phosphors in the first region 111 and the second region 112 are the same. The luminance of the light emitted from the light emitting layer 110 mainly depends on the volume fraction of the phosphor, and the luminance of the light emitted from the first region 111 and the second region 112 are closer to each other under the condition that the volume fractions of the phosphors are the same.
In this embodiment, the refractive index of the high refractive scattering particles is greater than 1.8, and the refractive index of the low refractive scattering particles is less than 1.8 and greater than 1.6. The larger the refractive index is, the larger the angle change of the blue light after the refraction at the interface of the high-refraction scattering particles is, and the shallower the excitation depth of the blue light in the light emitting layer 110 is. The low refractive scattering particles have a refractive index less than that of the high refractive scattering particles, but the low refractive scattering particles have a refractive index higher than that of the bonding material, otherwise their scattering reflection effect will not be significant. In the embodiment of the present invention, both the high-refractive-index scattering particles and the low-refractive-index scattering particles rely on the scattering effect generated by the difference in refractive index from the binder material, in addition to the reflection effect of the particles themselves.
In this embodiment, the high-refraction scattering particles include at least one of titanium oxide, zirconium oxide, and zinc oxide, and the low-refraction scattering particles include at least one of aluminum oxide, yttrium oxide, and barium sulfate. The particle size of the high-low refraction scattering particles is close to the wavelength of visible light, and the particles are white when observed by naked eyes and can scatter and reflect the visible light.
In this embodiment, the refractive index of the bonding material is less than 1.6, and the bonding material may be an inorganic bonding material or an organic bonding material. Optionally, the adhesive material includes one of silicone, epoxy resin, and glass frit.
In this embodiment, the light source device further includes a heat conducting substrate located on a surface of the reflective layer away from the light emitting layer, that is, the light emitting layer, the reflective layer, and the heat conducting substrate are sequentially stacked. The heat conduction substrate has the heat conductivity higher than 80W/mK and can be a ceramic substrate or a metal substrate.
In another embodiment of the present invention, the wavelength conversion device is a rotatable fluorescent color wheel, and the first region and the second region are distributed along a circumferential direction (or a radial direction in another embodiment) of the fluorescent color wheel. The fluorescent color wheel is driven to rotate by a motor, so that the blue light source irradiates the first area and the second area of the fluorescent color wheel at different time, and emergent light with different color temperatures is emitted.
Another embodiment of the present invention provides an illumination device, which includes the light source device described in the above embodiments, and the light source device can be used for white light illumination and can also be used as a white light source for image display.
In one embodiment of the invention, the illumination device is a vehicle lamp that can be adjusted to change the color temperature of the emerging light.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes performed by the present specification and drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (10)
1. An adjustable light source device, comprising a blue light source and a wavelength conversion device, wherein light emitted by the blue light source is incident on the wavelength conversion device, the wavelength conversion device comprises a light emitting layer and a reflecting layer, and the reflecting layer is positioned on the surface of the light emitting layer far away from the light incident side,
the light-emitting layer comprises fluorescent powder, high-refraction scattering particles, low-refraction scattering particles and a bonding material, and is formed by mixing the fluorescent powder, the high-refraction scattering particles, the low-refraction scattering particles and the bonding material;
the light-emitting layer comprises a first area and a second area, and the volume ratio of the high-refraction scattering particles to the low-refraction scattering particles in the first area is larger than that of the high-refraction scattering particles to the low-refraction scattering particles in the second area;
the adjusting device is used for adjusting the incidence of the light emitted by the blue light source to the first area or the second area;
the wavelength conversion device emits first emergent light when the light emitted by the blue light source irradiates the first area, the wavelength conversion device emits second emergent light when the light emitted by the blue light source irradiates the second area, and the color temperature of the first emergent light is higher than that of the second emergent light.
2. The light source device according to claim 1, wherein the phosphors in the first region and the second region are the same and are YAG phosphors.
3. The light source device according to claim 2, wherein the volume fractions of the phosphors in the first region and the second region are the same.
4. The light source device according to claim 1, wherein the phosphor is a yellow phosphor.
5. The light source device according to claim 1, wherein the refractive index of the high-refractive scattering particles is greater than 1.8, and the refractive index of the low-refractive scattering particles is less than 1.8 and greater than 1.6.
6. The light source device according to claim 5, wherein the high-refraction scattering particles include at least one of titanium oxide, zirconium oxide, and zinc oxide, and the low-refraction scattering particles include at least one of aluminum oxide, yttrium oxide, and barium sulfate.
7. The light source device according to claim 1, wherein the adhesive material has a refractive index of less than 1.6, and the adhesive material comprises one of silicone, epoxy, and glass frit.
8. The light source device according to claim 1, further comprising a heat conductive substrate on a surface of the reflective layer remote from the light emitting layer.
9. An illumination device comprising the light source device according to any one of claims 1 to 8.
10. The lighting device of claim 9, which is an automotive lamp.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610023770.7A CN106969305B (en) | 2016-01-14 | 2016-01-14 | Adjustable light source device and lighting device |
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| CN201610023770.7A CN106969305B (en) | 2016-01-14 | 2016-01-14 | Adjustable light source device and lighting device |
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| CN106969305A CN106969305A (en) | 2017-07-21 |
| CN106969305B true CN106969305B (en) | 2020-08-25 |
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| CN109751546A (en) * | 2017-11-02 | 2019-05-14 | 深圳市绎立锐光科技开发有限公司 | lighting device |
| CN110906272B (en) * | 2018-09-14 | 2021-11-16 | 深圳市绎立锐光科技开发有限公司 | Light source device and car light |
| CN111123629A (en) * | 2018-11-01 | 2020-05-08 | 深圳光峰科技股份有限公司 | Wavelength conversion device, manufacturing method thereof, light emitting device and projection device |
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Address after: 518000 20-22, 20-22 headquarters building, 63 high tech Zone, Xuefu Road, Nanshan District, Guangdong Province, Guangdong. Applicant after: APPOTRONICS Corp.,Ltd. Address before: 518000 20-22, 20-22 headquarters building, 63 high tech Zone, Xuefu Road, Nanshan District, Guangdong Province, Guangdong. Applicant before: SHENZHEN GUANGFENG TECHNOLOGY Co.,Ltd. Address after: 518000 20-22, 20-22 headquarters building, 63 high tech Zone, Xuefu Road, Nanshan District, Guangdong Province, Guangdong. Applicant after: SHENZHEN GUANGFENG TECHNOLOGY Co.,Ltd. Address before: 518055 Shenzhen Integrated Circuit Design and Application Industrial Park 401, No. 1089 Chaguang Road, Xili Town, Nanshan District, Shenzhen City, Guangdong Province Applicant before: APPOTRONICS Corp.,Ltd. |
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