CN109282169A - Wavelength converter, light source and projection arrangement comprising it - Google Patents
Wavelength converter, light source and projection arrangement comprising it Download PDFInfo
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- CN109282169A CN109282169A CN201710600503.6A CN201710600503A CN109282169A CN 109282169 A CN109282169 A CN 109282169A CN 201710600503 A CN201710600503 A CN 201710600503A CN 109282169 A CN109282169 A CN 109282169A
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- wavelength converter
- powder
- substrate
- partial size
- luminescent layer
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21K—NON-ELECTRIC LIGHT SOURCES USING LUMINESCENCE; LIGHT SOURCES USING ELECTROCHEMILUMINESCENCE; LIGHT SOURCES USING CHARGES OF COMBUSTIBLE MATERIAL; LIGHT SOURCES USING SEMICONDUCTOR DEVICES AS LIGHT-GENERATING ELEMENTS; LIGHT SOURCES NOT OTHERWISE PROVIDED FOR
- F21K9/00—Light sources using semiconductor devices as light-generating elements, e.g. using light-emitting diodes [LED] or lasers
- F21K9/60—Optical arrangements integrated in the light source, e.g. for improving the colour rendering index or the light extraction
- F21K9/64—Optical arrangements integrated in the light source, e.g. for improving the colour rendering index or the light extraction using wavelength conversion means distinct or spaced from the light-generating element, e.g. a remote phosphor layer
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED
- F21Y2115/00—Light-generating elements of semiconductor light sources
- F21Y2115/10—Light-emitting diodes [LED]
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Optics & Photonics (AREA)
- General Engineering & Computer Science (AREA)
- Projection Apparatus (AREA)
- Non-Portable Lighting Devices Or Systems Thereof (AREA)
Abstract
The present invention relates to a kind of Wavelength converter, include its light source and projection arrangement, the Wavelength converter includes luminescent layer, reflecting layer and the substrate stacked gradually, it is characterized in that, the luminescent layer includes the first glass powder and phosphor material powder, wherein the phosphor material powder encapsulates stratification by first glass powder, wherein the partial size D50 of the phosphor material powder is 5-20 μm.The present invention controls reflective particle by control phosphor material powder, preferably and the particle size of encapsulant makes the Wavelength converter in the case where ensure that high bonding yield, the accumulation filling rate of the reflective particle in phosphor particles and reflecting layer in luminescent layer is higher, and then make luminescent layer with higher light conversion efficiency and make reflecting layer that there is higher average reflectance, so that the Wavelength converter can still keep higher efficiency and reliability under high excitation light power density.
Description
Technical field
The present invention relates to a kind of Wavelength converter, include its light source and projection arrangement.
Background technique
Currently, the main application form of semiconductor light source is traditional LED light source and emerging laser light source, there is height
The display field of brightness requirement, traditional LED light source technology can no longer meet high brightness, high-power demand.Using emerging
The method of laser light source excitation wavelength transition material can obtain the visible light of various colors, the technology is more and more
Applied to illumination and display field, it is existing white light that this technology, which has high-efficient, less energy consumption, advantage at low cost, the service life is long,
Or monochromatic ideal alternative solution.
In laser light source, the technology of laser remote excitation rotation fluorescence colour wheel is generallyd use.For example, excitation light source is sent out
The turntable that a surface is phosphor sheet is collected and focused on to blue laser out, and excitated fluorescent powder material emission, turntable is in motor
Driving under high speed rotation, phosphor sheet is constantly changed by the region excited but facula position is constant, and can be with turntable
Rotation generates the color sequence of light of periodic timing.Mode of excitation is divided into reflective excitation and transmission-type excites two kinds.Actually answering
In, for the exciting light for obtaining highest light efficiency, more high usage, reflective excitation is often used.The wavelength convert of laser light source
Device often utilizes the silica gel packaging technology developed from LED light source technology, that is, uses silica gel mixed fluorescent powder, then brushes
It is applied on disc shape metal substrate, obtains the fluorescent powder packaging luminescent layer that can be used for rotating.However, when using more than LED function
When the higher laser irradiation of rate density, the amount of heat generated in laser irradiation process can be to the property of Wavelength converter luminescent layer
It can bring and significantly affect.
Therefore, for the above-mentioned critical issue that occurs in high power laser sources application, it is desirable to provide a kind of reliability is more
Good, the higher Wavelength converter of transfer efficiency.
Summary of the invention
In view of the foregoing, the object of the present invention is to provide a kind of better reliabilities, the higher wavelength convert of transfer efficiency
Device, light source and projection arrangement comprising it.
On the one hand, the present invention provides a kind of Wavelength converter, the Wavelength converter includes stacking gradually
Luminescent layer, reflecting layer and substrate, wherein luminescent layer includes the first glass powder and phosphor material powder, wherein the phosphor material powder quilt
First glass powder encapsulation stratification, the partial size D50 of the phosphor material powder are 5-20 μm.
Preferably, the Wavelength converter above-mentioned for the present invention, wherein the substrate is ceramic substrate, the substrate
(103) it is made of ceramic material or monocrystalline class inorganic material；The shape of the substrate (103) is selected from disc or circular ring shape.
Preferably, the Wavelength converter above-mentioned for the present invention, wherein the phosphor material powder is selected from yellow fluorescent powder
And/or green emitting phosphor and/or red fluorescence powder；Wherein, the partial size D50 of the yellow fluorescent powder is 8-17 μm；Wherein, described
The partial size D50 of green emitting phosphor is 15-16 μm；Wherein, the partial size D50 of the red fluorescence powder is 10-17 μm.
Preferably, in the above-mentioned Wavelength converter of the present invention, reflecting layer includes the second glass powder and reflective particle,
In the reflective particle stratification encapsulated by second glass powder, the partial size D50 of the reflective particle is 0.02-3 μm.
Preferably, the Wavelength converter above-mentioned for the present invention, wherein the shape in the reflecting layer and the luminescent layer
It is each independently a part of circular ring shape or circular ring shape；Wherein the reflecting layer is identical as the shape of the luminescent layer.
Preferably, the Wavelength converter above-mentioned for the present invention, first glass powder and the second glass powder class
Type is identical；The partial size D50 of first glass powder is 3.1-3.5 μm；The partial size D50 of second glass powder is 0.5-1 μm.
It is further preferred that the Wavelength converter above-mentioned for the present invention, the Wavelength converter further include
The second substrate below the substrate is set；The second substrate is selected from copper base, aluminum substrate, ceramic substrate, aluminium nitride list
Brilliant substrate.
On the other hand, the present invention provides a kind of light source, the light source includes Wavelength converter of the present invention.
Another aspect, the present invention provides a kind of projection arrangement, the projection arrangement turns comprising wavelength of the present invention
Changing device.
The present invention passes through phosphor material powder, preferably control reflective particle and the grain of encapsulant in control Wavelength converter
Diameter size makes the Wavelength converter in the case where ensure that high bonding yield, phosphor particles and reflection in luminescent layer
The accumulation filling rate of reflective particle in layer is higher, so that luminescent layer has higher light conversion efficiency and makes reflecting layer
With higher average reflectance, so that the Wavelength converter still can be kept under high excitation light power density
Higher efficiency and reliability.
Detailed description of the invention
Fig. 1 is the side view and top view of the construction of the Wavelength converter of embodiment according to the present invention.
Fig. 2 is the side view of the first modification of the Wavelength converter of embodiment according to the present invention.
Fig. 3 is the side view of the second modification of the Wavelength converter of embodiment according to the present invention.
Specific embodiment
Embodiments of the present invention are explained in detail next, with reference to attached drawing, but protection scope of the present invention and are not only limited
In this.
In this application, unless otherwise indicated, when term " D50 " indicates that the partial size cumulative distribution of particulate samples reaches 50%
Partial size size.
Firstly, illustrating the construction of the Wavelength converter of embodiment according to the present invention referring to Fig.1.As shown in Figure 1, wavelength
Conversion equipment includes the luminescent layer 101 stacked gradually, reflecting layer 102 and substrate 103.The material for preparing substrate 103 can be pottery
Ceramic material or monocrystalline class inorganic material.The substrate 103 can be arbitrary shape, and the shape of the preferably described substrate 103 can be circle
A part (such as semi-circular shape) of dish type, circular ring shape or circular ring shape.Reflecting layer 102 is adhered on a substrate 103, by reflecting layer
102 stimulated lights converted for the remaining exciting light of reflectance-transmittance luminescent layer 101 and luminescent layer 101, and the reflecting layer
Shape can be a part (such as semi-circular shape) of circular ring shape or circular ring shape.In addition, luminescent layer 101 is attached to reflecting layer 102
On, for issuing the visible light with the wavelength different from exciting light, the wherein shape of the luminescent layer under the excitation of exciting light
Shape is a part (such as semi-circular shape) of circular ring shape or circular ring shape.Above-mentioned three-decker can by 750 DEG C -950 DEG C, preferably
Sintering obtains at a temperature of 850 DEG C.
Then, it will be described in detail above-mentioned three-decker, that is, luminescent layer 101, reflecting layer 102 and substrate 103.
Luminescent layer 101
Luminescent layer 101 includes the first glass powder and phosphor material powder, and wherein the phosphor material powder is by being somebody's turn to do as encapsulant
First glass powder encapsulation stratification, forms the luminescent layer 101.The effect of luminescent layer 101 is to receive exciting light (for example, blue laser)
Irradiation and excite the phosphor material powder in the luminescent layer to generate the visible lights of other wavelength.Luminescent layer 101 is generally in the shape of
A part (such as semi-circular shape) of circular ring shape or circular ring shape.In general, the width one of the width of luminescent layer 101 and reflecting layer 102
It causes or slightly wide.
Phosphor material powder mainly uses yellow fluorescent powder, such as YAG:Ce3+Fluorescent powder；And green emitting phosphor, such as LuAG:
Ce3+Fluorescent powder.In addition it is also possible to using red fluorescence powder, such as the orange powder of Sialon class and CaAlSiN3:Eu2+Type of red powder etc.
Commercialized fluorescent powder.The partial size D50 of the fluorescent powder can be 5-20 μm, preferably 8-17 μm.For example, when using yellow fluorescent powder
When, the partial size D50 of the fluorescent powder is 8-17 μm, preferably 8 μm, 15 μm and 17 μm；It is described glimmering when using green emitting phosphor
The partial size D50 of light powder is 15-16 μm, preferably 15 μm and 16 μm；When using red fluorescence powder, the partial size of the fluorescent powder
D50 is 10-17 μm, preferably 10 μm, 15 μm and 17 μm.
The shape of phosphor material powder can choose the mellow and full spherical shape in edge, elliposoidal or polygon；Phosphor material powder can also
With the polygon or irregular shape for selecting edge sharp.When making luminescent layer, a kind of phosphor material powder can be selected, it can also
Select two different phosphor material powders that luminescent layer is made by mixing, for example, (1) is excited light color or drop in order to adjust luminescent layer
The content of low golf calorific value phosphor material powder mixes the phosphor material powder of different colours, such as short wavelength's yellow fluorescent powder+long wave
Long yellow fluorescent powder, fluorescent powder partial size D50 are determined by the selection of above-mentioned particle size range；Or (2) are in order to improve filling rate, shine effect
Rate and thermal stability, by the different fluorescent powder of particle size, (yellow fluorescent powder that such as partial size D50 is 17 μm, partial size D50 are 8 μm
Yellow fluorescent powder) mix, increase luminescent layer in fluorescent powder grain content.
For encapsulating the first glass (also referred to as " bond medium " of phosphor material powder；Hereinafter referred to as the first glass powder) it is optional
With silicate glass powder SiO2-B2O3- RO, wherein R is selected from one of Al, Mg, Ca, Sr, Ba, Na, K or a variety of.It is preferred that
The partial size D50 of first glass powder is 3.1-3.5 μm.In addition, as the first glass powder, may be used also in addition to above-mentioned silicate glass powder
To select other lead silicate glass powder, aluminium borosilicate glass powder, aluminate glass powder, sodium calcium with different softening point
One of glass powder and fused silica powder are a variety of.
The thickness of luminescent layer 101 may generally be 120-200 μm.
Reflecting layer 102
Reflecting layer 102 is between luminescent layer 101 and substrate 103.The effect in reflecting layer 102 is to through luminescent layer 101
Remaining exciting light (as excitation blue light) carry out reflection and to luminescent layer 101 convert stimulated light reflect.Wherein, instead
Penetrating layer 102 includes the second glass powder and reflective particle, and wherein the reflective particle is encapsulated by second glass powder as encapsulant
Stratification, the partial size D50 of the reflective particle is 0.02-3 μm, preferably 0.02-2 μm, 0.05-0.5 μm more preferable.Reflecting layer 102
Bond medium is used as using the second glass (hereinafter referred to as the second glass powder), the reflective particle of small particle is encapsulated into sheet,
The shape in reflecting layer 102 is usually consistent with the shape of luminescent layer 101, width of the width in reflecting layer 102 usually with luminescent layer 101
Consistent or slightly narrow, reflecting layer 102 is attached to the outer side surface of substrate 103.
Reflective particle uses the higher white inorganic powder of refractive index, mainly includes powdered aluminium oxide and titanium oxide grain
Son.It is preferred that the refractive index of aluminium oxide particles is 1.65-1.76, partial size D50 can be 0.1-0.5 μm, and shape is mainly spherical shape, can also
Think polyhedron or laminated structure；The refractive index of Titanium particles is 2.1-2.56, and partial size D50 can be 0.1-3 μm, preferably 0.5-
2μm。
Second glass powder equally can be selected from above-mentioned silicate glass powder SiO2-B2O3- RO is other with different soft
Change in lead silicate glass powder, aluminium borosilicate glass powder, aluminate glass powder, soda-lime glass powder and the fused silica powder of point
It is one or more.Second glass powder can select glass powder identical with the type of the first glass powder and/or partial size D50, alternatively,
Second glass powder can select but partial size D50 smaller glass powder identical as the type of the first glass powder, wherein smaller glass
It is bonding between reflecting layer and luminescent layer when powder may consequently contribute to be sintered, increase the reliability of Wavelength converter.It is preferred that the second glass
The partial size D50 of glass powder is 0.5-1 μm.Furthermore it is also possible to using other types of glass powder, as long as meeting thermal expansion coefficient and base
The conditions such as plate is close, light transmittance is high, sintering character is good.
Substrate 103
The thickness of substrate 103 can be 1-1.5mm, and thermal conductivity is 150 or more, and the shape of substrate can be disc, annulus
Shape or a part of circular ring shape etc..Aluminium nitride substrate, aluminum oxide substrate, alumina single crystal (sapphire) substrate, carbon can be used
SiClx substrate, silicon nitride board etc., as long as meeting the requirement of high-temperature process and high heat conductance.
Although hereinbefore being shown with reference to construction of the Fig. 1 to the Wavelength converter of embodiment according to the present invention
Example property explanation, but the construction of Wavelength converter of the invention is without being limited thereto, it is possible to have other constructions.
For example, as shown in Figures 2 and 3, another substrate 104 can be introduced, and the substrate 104 is connect with substrate 103.Example
Such as, after the completion of being prepared by above-mentioned three-decker (reflecting layer luminescent layer 101- 102- substrate 103) sintering, by being bonded, welding
Etc. low temperature process mode, be placed on substrate 104.Wherein, substrate 104 can be copper base, aluminum substrate, ceramic substrate or its
The substrate of its included heat dissipation effect, to provide some additional performances for light emitting device；Can also be aluminium oxide (sapphire),
The monocrystalline class substrate such as aluminium nitride, penetrates or some additional effects of plated film etc. in order to provide light beam.In this case, substrate
103 shape can be disc as shown in Figure 2 or circular ring shape as shown in Figure 3.
Moreover, it relates to a kind of light source, the light source includes Wavelength converter of the present invention.
In addition, the projection arrangement is filled comprising wavelength convert of the present invention the invention further relates to a kind of projection arrangement
It sets.
Moreover, it relates to a kind of lighting device, the lighting device is filled comprising wavelength convert of the present invention
It sets.
The light source for example can be applied to laser education projector, laser television, laser engineering projector, cinema projection
Machine, laser DLP combination etc..
Embodiment
Then, the Nomenclature Composition and Structure of Complexes of illustrative Wavelength converter of the invention is illustrated example is prepared by the following procedure.
The present inventor has found under study for action, for Wavelength converter, the partial size of the phosphor material powder in luminescent layer
Affect luminous efficiency and yield (reliability).When the partial size of phosphor material powder is within a certain range (5-20 μm),
For the phosphor material powder with smaller particle (< 5 μm), while ensuring preferable yield, it can be realized preferably
Luminous efficiency；For the phosphor material powder with bigger partial size (> 20 μm), better yield is not only realized, but also
Better luminous efficiency is realized, yield herein refers to that in the Wavelength converter sample of preparation, reliability meets the requirements
Sample account for the ratio of sample total amount.
In addition, the present inventors have additionally discovered that, for Wavelength converter, the partial size of the reflective particle in reflecting layer can be into
One step influences average reflectance.When the partial size of reflective particle is within a certain range (0.02-3 μm), compared with more
The reflective particle of big partial size (> 3 μm), can show that higher average reflectance (91% or more).Go out as shown in Table 2 below
, when the partial size for emitting particle is greater than 3 μm, the inventors discovered that since same filling rate in order to obtain needs to increase bonding
This defect of agent, reflectivity will appear biggish decline.
Shown in following Tables 1 and 2, using different phosphor material powder partial sizes and the prepared wave of reflective particle partial size
Long conversion equipment shows different yields, luminous efficiency and reflectivity.The present inventor has found phosphor material powder partial size for the first time
Relationship between reflective particle partial size and yield, luminous efficiency and reflectivity.
The corresponding luminous efficiency of phosphor material powder and yield of 1 different-grain diameter of table
As can be seen from the above table, good luminous efficiency (172Lm/W or more) and yield (80% are obtained in order to meet simultaneously
More than) requirement, need to prepare using having the phosphor material powder of partial size (5-20 μm) fallen into range of the present invention
Wavelength converter.And when the partial size of phosphor material powder increases to 20 μm or more, since the accumulation filling rate of fluorescent powder is lower,
So the luminous efficiency for the Wavelength converter being prepared is decreased obviously.
The corresponding average reflectance of reflective particle of 2 different-grain diameter of table
As can be seen from the above table, when using the reflection grain with the partial size (0.02-3 μm) fallen into range of the present invention
When son prepares Wavelength converter, higher average reflectance (91% or more) can be further displayed out.As mentioned previously,
When the partial size for emitting particle is greater than 3 μm, there is biggish decline in average reflectance.
Although hereinbefore illustratively illustrating Wavelength converter according to the present invention referring to attached drawing, this
Invent it is without being limited thereto, and it will be understood by those skilled in the art that in the spirit limited without departing from appended claims of the present invention or
In the case where design, various changes, combination, secondary combination and modification can be made.
Claims (9)
1. a kind of Wavelength converter, the Wavelength converter includes the luminescent layer stacked gradually, reflecting layer and substrate, spy
Sign is that the luminescent layer includes the first glass powder and phosphor material powder, wherein the phosphor material powder is by first glass
Powder encapsulation stratification；
The partial size D50 of the phosphor material powder is 5-20 μm.
2. Wavelength converter as described in claim 1, which is characterized in that the substrate be ceramic substrate, the substrate by
Ceramic material or monocrystalline class inorganic material composition；
The shape of the substrate is selected from disc or circular ring shape.
3. Wavelength converter as described in claim 1, wherein the phosphor material powder is selected from yellow fluorescent powder and/or green
Color fluorescent powder and/or red fluorescence powder；
Wherein, the partial size D50 of the yellow fluorescent powder is 8-17 μm；
Wherein, the partial size D50 of the green emitting phosphor is 15-16 μm；
Wherein, the partial size D50 of the red fluorescence powder is 10-17 μm.
4. Wavelength converter as described in claim 1, wherein the reflecting layer includes the second glass powder and reflective particle,
Wherein the reflective particle encapsulates stratification by second glass powder；The partial size D50 of the reflective particle is 0.2-3 μm.
5. such as Wavelength converter of any of claims 1-4, wherein the shape in the reflecting layer and the luminescent layer
Shape is each independently a part of circular ring shape or circular ring shape；
Wherein the reflecting layer is identical as the shape of the luminescent layer.
6. Wavelength converter as claimed in claim 4, wherein first glass powder and the second glass frit types phase
Together；
Wherein, the partial size D50 of first glass powder is 3.1-3.5 μm；
Wherein, the partial size D50 of second glass powder is 0.5-1 μm.
7. Wavelength converter as described in claim 1, the Wavelength converter, which further includes, to be arranged in the substrate
The second substrate of lower section；
Wherein the second substrate is selected from copper base, aluminum substrate, ceramic substrate, aluminum-nitride single crystal substrate.
8. a kind of light source, the light source includes Wavelength converter of any of claims 1-7.
9. a kind of projection arrangement, the projection arrangement includes Wavelength converter of any of claims 1-7.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710600503.6A CN109282169B (en) | 2017-07-21 | 2017-07-21 | Wavelength conversion device, light source comprising same and projection device |
| PCT/CN2017/114718 WO2019015221A1 (en) | 2017-07-21 | 2017-12-06 | Wavelength conversion device, light source comprising same, and projection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710600503.6A CN109282169B (en) | 2017-07-21 | 2017-07-21 | Wavelength conversion device, light source comprising same and projection device |
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| Publication Number | Publication Date |
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| CN109282169A true CN109282169A (en) | 2019-01-29 |
| CN109282169B CN109282169B (en) | 2021-10-26 |
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| WO (1) | WO2019015221A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113625517A (en) * | 2020-05-07 | 2021-11-09 | 台达电子工业股份有限公司 | Wavelength conversion device |
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| CN105470370A (en) * | 2015-11-25 | 2016-04-06 | 南京大学 | Manufacturing method of fluorescent glass light conversion material and application thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113625517A (en) * | 2020-05-07 | 2021-11-09 | 台达电子工业股份有限公司 | Wavelength conversion device |
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| Publication number | Publication date |
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| WO2019015221A1 (en) | 2019-01-24 |
| CN109282169B (en) | 2021-10-26 |
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