CN105042517A - Wavelength conversion device and light emitting device - Google Patents
Wavelength conversion device and light emitting device Download PDFInfo
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- CN105042517A CN105042517A CN201510249990.7A CN201510249990A CN105042517A CN 105042517 A CN105042517 A CN 105042517A CN 201510249990 A CN201510249990 A CN 201510249990A CN 105042517 A CN105042517 A CN 105042517A
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- fluorescent material
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- material layer
- exciting light
- wavelength converter
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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
- F21V9/40—Elements for modifying spectral properties, polarisation or intensity of the light emitted, e.g. filters with provision for controlling spectral properties, e.g. colour, or intensity
Abstract
The invention provides a wavelength conversion device and a light emitting device. The wavelength conversion device comprises a drive device fixedly connected with a fluorescent material layer and used for driving the fluorescent material layer and exciting light to periodically move relatively. The molecular formula of the fluorescent material of the fluorescent material layer is (YLLumGdnTb3-L-m-n)Al5O12:Ce, or Y3(AlyGa5-y)O12:Ce, or (YLLumGdnTb3-L-m-n)(AlyGa5-y)O12:Ce, wherein L, m, n and y are all real numbers larger than or equal to 0, the sum of L and m is larger than or equal to 0 and smaller than 3, the sum of L, m and n is larger than or equal to 0 and smaller than or equal to 3, and y is smaller than 5. The dominant wavelength of the emission spectrum of the fluorescent material is larger than the dominant wavelength of the emission spectrum of the fluorescent material with the molecular formula of Y3Al5O12:Ce under the same exciting condition. The proportion of the diameter of light spots, irradiated to the fluorescent material layer, through the exciting light to the length of the track of one period of the relative movement of the exciting light on the fluorescent material layer is smaller than 3%. According to the wavelength conversion device and the light emitting device, the light emitting brightness of red light can be greatly improved through modified YAG fluorescent powder and relative movement of the modified YAG fluorescent powder and the exciting light.
Description
Technical field
The divisional application that the present invention is application number is 201210038232.7, the applying date is on February 20th, 2012, denomination of invention is the patent application of " Wavelength converter and light-emitting device ".The present invention relates to optical technical field, particularly relate to Wavelength converter and light-emitting device.
Background technology
At present, solid state light emitter based on wavelength convert more and more becomes the focus of investigation and application, the white light source such as using blue light-emitting diode (LED, lightemittingdiode) to excite yellow fluorescent powder to make is accepted widely and is used.
With general illumination unlike, in field of projection display, in order to obtain coloured image, general adopt monochromatic time sequence light source as lighting source.One method uses multiple optical filter to filter white light successively to obtain monochromatic light, but the efficiency of filter process is very low; Another kind method directly uses monochromatic material for transformation of wave length to obtain monochromatic light, such as, use green emitting phosphor to be excited to produce green glow.The efficiency of second method increases significantly than first method, but problem is that the efficiency of red fluorescence powder is too low, and service life is too short, and then makes ruddiness become the efficiency of whole light-source system and the bottleneck in life-span.
Produce the problem of ruddiness to solve, someone proposes to use high efficiency and stable yellow fluorescent powder, by optical filter the green color components in its emission spectrum is filtered out and produces ruddiness.Yellow fluorescent powder the most frequently used is at present YAG fluorescent powder, and the molecular formula of YAG fluorescent powder is Y
3al
5o
12: Ce, the part wherein before colon refers to the molecular formula of the host lattice of this fluorescent material, colon below be the element of the centre of luminescence be entrained in this lattice.The emission spectrum of YAG fluorescent powder is as shown in 101 in Fig. 1, and the part generally defining wherein more than 600nm is red-light spectrum composition, is expressed as 101R in FIG.Certain color due to light is continually varying with wavelength, and the boundary line of 600nm is herein only citing for convenience of description.
Because YAG fluorescent powder is proved to be, there is very good stability, this method can well solve the problem of the life-span bottleneck of ruddiness, but as can see from Figure 1, this method can cause the loss of the spectral energy of below 600nm simultaneously, and this part energy is the region that in YAG fluorescent powder emission spectrum 101, energy is the most concentrated.This mainly due to YAG fluorescent powder lower in the Energy distribution of red-light spectrum composition caused by.
In order to address this problem, people propose to carry out modification by other element that adulterates in the host lattice of YAG fluorescent powder to YAG fluorescent powder, and its emission spectrum is moved to long wavelength, to improve the relative energy distribution of its red-light spectrum composition.Illustrate in Fig. 2 YAG fluorescent powder before modified after emission spectrum compare, emission spectrum is before modified 101, and the molecular formula of modification fluorescent material one is (Y
2tb
1) Al
5o
12: Ce, its emission spectrum is 201, and the molecular formula of modification fluorescent material two is (Y
1tb
2) Al
5o
12: Ce, its emission spectrum is 202.Can know by comparing molecular formula, by Y
3al
5o
12replace with Tb atom Y atomic component in lattice, emission spectrum can be made to drift about to long wavelength, and Y atom by Tb atom replace more, then emission spectrum to long wavelength drift about more.Known by calculating, the dominant wavelength 5nm longer than the spectrum dominant wavelength shown in 101 of the spectrum shown in 201, the dominant wavelength 10nm longer than the spectrum dominant wavelength shown in 101 of the spectrum shown in 202.
Apparent, the red-light spectrum composition of modified fluorescent material has stronger Energy distribution, therefore can produce more ruddiness relative to YAG fluorescent powder before modified.
But, the modification of YAG fluorescent powder make the dominant wavelength of emission spectrum become large while, its temperature stability also can be made to decline, as shown in Figure 3.Wherein 310 is efficiency variation with temperature curves of unmodified YAG fluorescent powder, and 311 and 312 is (Y respectively
2tb
1) Al
5o
12: Ce and (Y
1tb
2) Al
5o
12: the efficiency variation with temperature curve of Ce.As seen from the figure, the dominant wavelength of phosphor emission spectrum moves larger to long wavelength, then the temperature stability of fluorescent material is poorer, and the wavelength conversion efficiency in work is lower.
Other modification also has similar effect, such as use the Y element in Gd element replacement YAG lattice, or use Ga element replaces the Al element in YAG lattice, capital makes the dominant wavelength of the emission spectrum of fluorescent material become large, but also can cause the decline of its temperature stability simultaneously, and dominant wavelength is larger, then temperature stability decline Shaoxing opera is strong.Although use the Lu element Y element replaced in YAG lattice can not cause the decline of temperature stability, this can make the dominant wavelength of the emission spectrum of fluorescent material diminish simultaneously, and the Energy distribution of red-light spectrum composition reduces.
By experiment, we have also been attempted and are used by two or more replacement element simultaneously, such as (Y
1gd
1tb
1) (Al
4ga
1) O
12: Ce, even uses replacement element to be replaced completely by the element in former YAG lattice, such as (Tb
2gd
1) Ga
5o
12: Ce, but the dominant wavelength that still can not solve emission spectrum increases the contradiction between heat endurance.
So need a kind of Wavelength converter, while making red-light spectrum composition obtain larger Energy distribution, wavelength conversion efficiency does not decline.
Summary of the invention
The technical problem underlying that the present invention solves is the contradiction between the Red energies of fluorescent material transmitting and the heat endurance of this fluorescent material.
The present invention proposes a kind of Wavelength converter, comprises fluorescent material layer, and this fluorescent material layer is for receiving exciting light and launching Stimulated Light; Also comprise the drive unit be fixedly connected with fluorescent material layer, for driving fluorescent material layer and exciting light periodic relative motion.
Fluorescent material layer at least comprises the first section, and this first section comprises the first fluorescent material;
The ratio that exciting light is radiated at the diameter of the hot spot on fluorescent material layer and the path length of the relative motion one-period of exciting light on fluorescent material layer is less than 3%;
The time that first fluorescent material of each local is excited in one-period is less than 250 microseconds.
The present invention also proposes a kind of light-emitting device, comprises the excitation source for launching exciting light; Also comprise above-mentioned Wavelength converter, for receiving described exciting light and launching Stimulated Light or Stimulated Light and there is no the mixed light of absorbed residual excitation light.
In Wavelength converter of the present invention and light-emitting device, utilize modification YAG fluorescent powder and and exciting light between relative motion, increase substantially the brightness of red light-emitting.
Accompanying drawing explanation
Fig. 1 is the emission spectrum of YAG fluorescent powder;
Fig. 2 be before modified after YAG fluorescent powder emission spectrum contrast;
Fig. 3 is the efficiency variation with temperature curve of the fluorescent material shown in Fig. 2;
Fig. 4 is the structural representation of the first embodiment of the present invention;
Fig. 5 a, 5b and 5c are the structural representations of the second embodiment of the present invention and distortion thereof;
Fig. 6 is the structural representation of the third embodiment of the present invention;
Fig. 7 is the front view of fluorescent material layer in the third embodiment of the present invention.
Detailed description of the invention
In the following description, Y representative element yttrium, Lu representative element lutetium, Gd representative element gadolinium, Tb representative element terbium, Al representative element aluminium, Ga representative element gallium, O representative element oxygen, Ce representative element cerium, nm represents long measure nanometer.
The structural representation of Wavelength converter of the present invention as shown in Figure 4.Wherein, Wavelength converter 400 comprises fluorescent material layer 431, and this fluorescent material layer 431 is for receiving exciting light 437 and launching Stimulated Light (not shown in FIG.); Also comprise the drive unit 421 be fixedly connected with fluorescent material layer 431, for driving fluorescent material layer 431 and exciting light periodic relative motion.In the present embodiment, this drive unit is motor, and it can drive fluorescent material layer 431 to do uniform circular motion.
In the present embodiment, fluorescent material layer 431 comprises the first fluorescent material, and the molecular formula of this first fluorescent material is (Y
llu
mgd
ntb
3-L-m-n) Al
5o
12: Ce, or Y
3(Al
yga
5-y) O
12: Ce, or (Y
llu
mgd
ntb
3-L-m-n) (Al
yga
5-y) O
12: Ce, wherein L, m, n, y be all be more than or equal to 0 real number, and meet L+m and be more than or equal to 0 and be less than 3, L+m+n and be more than or equal to 0 and be less than or equal to 3, y and be less than 5.
For the first possible molecular formula (Y of the first fluorescent material
llu
mgd
ntb
3-L-m-n) Al
5o
12: Ce, this modification fluorescent material is replaced by Y atom in YAG lattice or partly replaces to Lu, the atoms such as Gd, Tb; Due to L, m, n be all be more than or equal to 0 real number, and L+m+n is more than or equal to 0 and is less than or equal to 3, therefore, all meet in the average atom number of an elementary cell Y, Lu, Gd, Tb and be more than or equal to 0 and be less than or equal to 3, and the average atom number sum of Y, Lu, Gd, Tb equals 3; Meanwhile, be more than or equal to 0 due to L+m and be less than 3, therefore in this fluorescent material, at least there are one of Gd and Tb two kinds of elements.Experiment proves, such atom replacement can make the dominant wavelength of the emission spectrum of fluorescent material become large.
For the molecular formula Y that the second of the first fluorescent material is possible
3(Al
yga
5-y) O
12: Ce, this modification fluorescent material is replaced the position of the Al in YAG lattice or partly replaces to Ga element; Be more than or equal to 0 due to y and be less than 5, therefore necessarily there is Ga element in this fluorescent material, and when y equals 0, the Al atom in YAG lattice completely replace by Ga atom.Experiment proves, such atom replacement can make the dominant wavelength of the emission spectrum of fluorescent material become large.
For the third possible molecular formula (Y of the first fluorescent material
llu
mgd
ntb
3-L-m-n) (Al
yga
5-y) O
12: Ce, understandable, it is the combinationally using of two kinds of method of modifying above, is namely replaced by Y atom in YAG lattice or part replaces to Lu, the atoms such as Gd, Tb simultaneously, is replaced by Al element or part replaces to Ga atom.Experiment proves, such atom replacement can make the dominant wavelength of the emission spectrum of fluorescent material become large.
In sum, the dominant wavelength of the emission spectrum of the first fluorescent material of above method of modifying is used to be greater than molecular formula for Y
3al
5o
12: the dominant wavelength of the emission spectrum of fluorescent material under identical shooting condition of Ce, and then the Energy distribution improving red-light spectrum composition in the first fluorescent material emission spectrum, and the final brightness improving ruddiness.Emphasize it is because the dominant wavelength of fluorescent material stimulated emission spectrum and shooting condition exist certain relation under identical shooting condition herein, such as can there is slight change along with the change of the change of temperature and exciting power in emission spectrum.
But according to Fig. 3, along with the lifting of operating temperature, the decrease speed of the efficiency of the first fluorescent material is far away higher than YAG fluorescent material, therefore in the present embodiment, utilize the drive unit 421 be fixedly connected with fluorescent material layer 431 to drive this fluorescent material layer 431 and exciting light periodic relative motion, and reduce the temperature of the first fluorescent material with this.According to Fig. 3, in the interval of lower temperature, the heat endurance of the fluorescent material of modification differs also few compared with YAG fluorescent material, as long as therefore the operating temperature of fluorescent material is controlled in lower scope, such as less than 100 degrees Celsius, even less than 50 degrees Celsius, just significantly can reduce the impact of temperature on modification fluorescent material, thus the brightness of the red light-emitting of final outgoing is improved.
Concrete operation principle is as follows:
Due to the existence of the specific heat capacity of fluorescent material layer, after fluorescent material is stimulated, temperature can not reach peak at once, but has a process risen; The length T of the time required for this uphill process is relevant with the size of the specific heat capacity of fluorescent material layer.In the present embodiment, drive unit is a motor 421, and the profile of fluorescent material layer 431 is circles, and it is driven the center of circle around this circle to rotate by motor 421; The position of exciting light 437 remains unchanged simultaneously.Like this, the first fluorescent material of each local only just can be excited when turning to the position that exciting light 437 irradiates, once the position leaving exciting light 437 irradiation will begin to cool down.
Simple computation can go out the time t that is excited in one-period of the first fluorescent material of each local.If it is the circle that diameter equals D that exciting light 437 is irradiated to the hot spot that fluorescent material layer 431 surface formed, the distance in the center of circle of the positional distance fluorescent material layer 431 that hot spot irradiates is R, and revolution one circle needs C second, has like this:
From formula (1), the spot diameter D of exciting light 437 is less, and the citing R in the positional distance center of circle that hot spot irradiates is larger, and the rotating speed of motor is higher, and t is less.In real work, the rotating speed of motor is generally 7200 revs/min, therefore C=8.333 millisecond.As long as the ratio of the spot diameter D of exciting light 437 and the path length of this hot spot on fluorescent material layer is less than 3%, t and is just less than 250 microseconds.Such as at D=2 millimeter, when R=30 millimeter, t is only 88 microseconds.In this case, the time t that is excited in one-period of first fluorescent material of each local is far smaller than the time T (being in general a millisecond magnitude) of fluorescent material temperature ramp de, now fluorescent material be stimulated after temperature have little time to rise and just have left the position of excitation.Therefore, utilize fluorescent material layer 431 relative to the relative motion of exciting light 437, make the first fluorescent material work in by pulsed duty, its temperature may well below the duty be excited continuously.
But, the heat that exciting light 437 excitation fluorescent material layer produces still can cause the first fluorescent material temperature to rise, only in Wavelength converter of the present invention, utilize above-mentioned pulsed operation state, this part heat is similar to the track being scattered in the inswept fluorescent material layer of exciting light 437 fifty-fifty, therefore understandable, as long as increase the value of R, just can reduce the heat that local the first fluorescent material is shared, namely reduce the temperature of the first fluorescent material.
In real work, the hot spot formed on fluorescent material layer due to exciting light 437 is determined often, and the rotating speed of motor is also determined constant, therefore the operating temperature of the first fluorescent material can constantly be reduced by the distance R in the center of circle increasing the positional distance fluorescent material layer 431 that exciting light 437 irradiates, until its efficiency reaches requirement.Experimentally, hot spot is excited for diameter 1.88 millimeters, general instructions for use can be met when R approximates 10 millimeters, now excite the ratio of the diameter of hot spot and the path length of this hot spot on fluorescent material layer to approximate 3%; And R can obtain higher efficiency when approximating 20 millimeters, now excites the ratio of the diameter of hot spot and the path length of this hot spot on fluorescent material layer to approximate 1.5%.
More generally, drive unit can also be the motor of other form, such as straight reciprocating motion.Now, as long as the ratio of the exciting light diameter and the path length of this hot spot on fluorescent material layer that are radiated at the hot spot on fluorescent material layer is less than 3%, just can thinks to meet and actually use needs; When the ratio of diameter and the path length of this hot spot on fluorescent material layer that exciting light is radiated at the hot spot on fluorescent material layer is less than 1.5%, fluorescent material layer can realize higher efficiency.
What deserves to be explained is, when the hot spot that exciting light is radiated on fluorescent material layer is not circle, can represent the size of this hot spot with the external diameter of a circle of this hot spot, therefore the diameter of hot spot refers to diameter (when hot spot is circle) or its external diameter of a circle of himself in the present invention.
Worth explanation, the centre of luminescence be entrained in the present invention in fluorescent material lattice is all rare earth element ce, and the doping content of Ce also can affect the dominant wavelength of the emission spectrum of this fluorescent material.Therefore the dominant wavelength of the emission spectrum of said first fluorescent material is greater than the dominant wavelength that molecular formula is the emission spectrum of fluorescent material under identical shooting condition of Y3Al5O12:Ce in the present invention, carries out the doping content of such comparison to be Ce doping content in the first fluorescent material with molecular formula be Ce in the fluorescent material of Y3Al5O12:Ce is identical.
Fluorescent material layer has multiple production method, such as, is evenly coated in a substrate surface after being mixed with organic transparent colloid by the first fluorescent material, and then heating makes this organic colloid solidify to form fluorescent material layer.This fluorescent material layer can strip down use from base material, also can not peel off and directly use.Organic transparent colloid includes but not limited to the material such as silica gel, epoxy resin.Be sprayed on substrate surface after such as being mixed with inorganic binder by the first fluorescent material again, the solvent volatilization after heating or standing and drying in inorganic binder forms the lamella of fluorescent material.Conventional inorganic binder comprises waterglass etc.Heating and melting after first fluorescent material can also being mixed with glass material, carries out after shaping cooling and forming fluorescence lamella; In order to reduce manufacture difficulty, this glass material can be low melting point glass material.
In the present embodiment, the periodic relative motion of fluorescent material layer and exciting light is utilized to make fluorescent material layer remain on lower operating temperature, make the first fluorescent material work in the duty of greater efficiency like this, drift from the spectrum further utilizing the first fluorescent material to be formed due to modification to long wavelength and improve the lifting finally obtaining red light-emitting brightness.In real work, possible this comprises refrigerating plant for this Wavelength converter dispels the heat, and such as fan or semiconductor cooler, this belongs to prior art, does not repeat herein.
As the second embodiment, the present invention also proposes a kind of light-emitting device, as shown in Figure 5 a.Wherein, light-emitting device 510 comprises the excitation source 532 for launching exciting light 537, with the Wavelength converter 531 comprising fluorescent material layer 531a, this Wavelength converter 531 is for receiving exciting light 537 and launching Stimulated Light or Stimulated Light and do not have the mixed light 539 of absorbed residual excitation light.
In Wavelength converter 531 in the present embodiment, also comprise light splitting optical filter 533, its transmission exciting light 537 is the Stimulated Light that sends of reflected fluorescent light material layer simultaneously, and such fluorescent material layer 531a will to be reflected by it and from another surperficial outgoing towards the Stimulated Light that light splitting optical filter 533 sends.Light splitting optical filter 533 is made by transparent substrates (such as glass) upper plating optical thin film, and preferably, the coated surface of light splitting optical filter 533 is towards fluorescent material layer 531a.
Also comprise the optical filter 534 being positioned over fluorescent material layer light path rear end in the Wavelength converter 531 of the light-emitting device of the present embodiment, this optical filter 534 is for the green spectrum composition in the Stimulated Light that sent by fluorescent material layer and red-light spectrum component separation.In the present embodiment, optical filter 534 is absorption-type optical filters, its transmit red light spectral component 539, and absorbs green spectrum composition.In fact, optical filter 534 can also be interferometric filter, for transmit red light spectral component 539, and reflect green light spectral component.
When optical filter 534 be designed to can not through exciting light time, light beam 539 only includes the red-light spectrum composition in Stimulated Light, and when optical filter 534 be designed to can through exciting light time, light beam 539 is red-light spectrum composition in Stimulated Light and the mixed light not having absorbed residual excitation light.
In the art, red-light spectrum composition generally refers to the visible light composition that wavelength is greater than 600nm, but can need according to different the accurate location choosing red-light spectrum composition in actual applications, such as also can choose the visible light composition that wavelength is greater than 590nm, compared with the visible light composition being greater than 600nm with wavelength, such ruddiness is more partially orange, but brightness is obviously higher; Therefore can decide the scope of red-light spectrum composition according to the compromise consideration of color and brightness in real work, and then determine the choosing and processing of light-filtering characteristic of optical filter 534.This belongs to known technology, does not repeat herein.
Light-emitting device 520 is as shown in Figure 5 b first distortion of second embodiment of the invention, with the embodiment shown in Fig. 5 a unlike, light splitting optical filter 533 is fixedly connected with drive unit 521 respectively with optical filter 534, and driven device 521 drives and moves together with fluorescent material layer 531.Be appreciated that light-emitting device 520 and the illumination effect of light-emitting device 510 are substantially identical.
There is horizontal transmission in the inside of light splitting optical filter 533 and optical filter 534 in the light sent to prevent fluorescent material layer 531, preferably, there is air-gap respectively between fluorescent material layer 531 and light splitting optical filter 533 and optical filter 534.
Light-emitting device 530 is as shown in Figure 5 c second distortion of second embodiment of the invention, with the embodiment shown in Fig. 5 b unlike, optical filter 535 is not fixedly connected with drive unit.In the present embodiment, optical filter 535 is light splitting optical filter, and its transmit red light spectral component is reflect green light spectral component simultaneously.The light 538 that fluorescent material layer 531 sends is with the incident angles of about 45 degree in optical filter 535 surface, and red-light spectrum composition 539a transmission, green spectrum composition 539b reflects.Certainly, understandable, only need change optical filter 535 through spectral line, just can realize red-light spectrum and become sub reflector, the transmission of green spectrum composition.
This light-emitting device 530 is with the difference of the light-emitting device 510 shown in Fig. 5 a, and light-emitting device 530 is while obtaining ruddiness emergent light 539a, and can also utilize green glow emergent light 539b in another light path, this effectively raises the efficiency of system.
The third embodiment of the present invention as shown in Figure 6, with the second embodiment unlike, the Wavelength converter 631 of the light-emitting device 600 of the present embodiment comprises the speculum 633 of the surperficial side of its reception exciting light being dorsad positioned over fluorescent material layer 631a, and this speculum 633 surface is coated with reflecting layer.Speculum 633 is fixedly connected with fluorescent material layer 631a, and driven device drive is moved together with fluorescent material layer 631a.Difference with reference to the embodiment shown in figure 5a with Fig. 5 b is appreciated that speculum 633 also can not move with fluorescent material layer 631a in the present embodiment.
In the present embodiment, fluorescent material layer 631a to be reflected by speculum 633 at the light sent towards speculum 633 direction and from the direction outgoing of back-reflection mirror 633, forms emergent light 638.The present embodiment also comprises the optical filter 634 being positioned over fluorescent material layer 631a light path rear end, green spectrum composition in this optical filter 634 transmission exciting light and Stimulated Light reflects the red-light spectrum composition in Stimulated Light simultaneously, emergent light 638 is incident in red-light spectrum composition 639 after optical filter 634 and is able to outgoing by reflection, and green spectrum composition (not shown in FIG.) is then through optical filter 634.
Preferably, speculum 633 is coated with the one side in reflecting layer towards fluorescent material layer 631a.
In the Wavelength converter 631 of the light-emitting device of the present embodiment, fluorescent material layer 631a also comprises the second section and the 3rd section, and its front view as shown in Figure 7.Wherein the first section 731a comprises the first fluorescent material, and the second section 731b comprises the second fluorescent material, and the glow color of the second fluorescent material is different from the glow color of the first fluorescent material.In the present embodiment, the second fluorescent material stimulated emission green glow.3rd section 731c does not comprise fluorescent material.
In the present embodiment, as shown in Figure 7, three sections are placed side by side, change the periodic relative motion of layer 631a and blue excitation light along with fluorescence dress and irradiated by blue excitation light successively, and produce red light-emitting at the first section, produce green luminescence at the second section, in the 3rd section outgoing blue excitation light itself, and then the periodicity timesharing achieving red, green, blue three primary colours exports.This light-emitting device can use as the light source of Projection Display.
Be understandable that, fluorescence in the present embodiment dress changes layer and comprises more than one section, and this situation is equally applicable in the first embodiment of the present invention and the second embodiment and distortion thereof.
Of the present invention second and the 3rd employs different optical textures to realize the output of final Stimulated Light in embodiment; In fact other optical texture can also be used.It should be noted that the citing of the optical texture used in the present invention is not construed as limiting the invention, as long as there is key feature of the present invention and the embodiment obtaining corresponding beneficial effect all belongs to scope of patent protection of the present invention.
The foregoing is only embodiments of the invention; not thereby the scope of the claims of the present invention is limited; every utilize description of the present invention and accompanying drawing content to do equivalent structure or equivalent flow process conversion; or be directly or indirectly used in other relevant technical fields, be all in like manner included in scope of patent protection of the present invention.
Claims (13)
1. a Wavelength converter, is characterized in that, comprising:
Fluorescent material layer, this fluorescent material layer is for receiving exciting light and launching Stimulated Light;
The drive unit be fixedly connected with described fluorescent material layer, for driving fluorescent material layer and described exciting light periodic relative motion;
Be further characterized in that:
Described fluorescent material layer at least comprises the first section, and this first section comprises the first fluorescent material;
The ratio that described exciting light is radiated at the diameter of the hot spot on described fluorescent material layer and the path length of the relative motion one-period of exciting light on described fluorescent material layer is less than 3%;
The time that first fluorescent material of each local is excited in one-period is less than 250 microseconds.
2. Wavelength converter according to claim 1, is characterized in that, the ratio of diameter and the relative movement orbit length of exciting light on described fluorescent material layer that described exciting light is radiated at the hot spot on described fluorescent material layer is less than 1.5%.
3. Wavelength converter according to claim 1, is characterized in that, also comprise the speculum of the surperficial side of its reception exciting light being dorsad positioned over described fluorescent material layer, this mirror surface is coated with reflecting layer.
4. Wavelength converter according to claim 3, is characterized in that, described speculum is coated with the surface in described reflecting layer towards described fluorescent material layer.
5. Wavelength converter according to claim 3, is characterized in that, described speculum is fixedly connected with described fluorescent material layer.
6. Wavelength converter according to claim 1, it is characterized in that, also comprise and be positioned over the light splitting optical filter that described fluorescent material layer receives the side of exciting light, this light splitting optical filter surface is coated with optical thin film, and exciting light described in this optical thin film transmission also reflexes to Stimulated Light described in small part.
7. Wavelength converter according to claim 6, is characterized in that, described light splitting optical filter is coated with the surface of optical thin film towards described fluorescent material layer.
8. Wavelength converter according to claim 6, is characterized in that, there is air-gap between described fluorescent material layer and described light splitting optical filter.
9. Wavelength converter according to claim 6, is characterized in that, described light splitting optical filter is fixedly connected with described drive unit.
10. Wavelength converter according to claim 1, is characterized in that, described fluorescent material layer is for shaping and obtain by described first fluorescent material to be mixed heating and melting afterwards with glass material.
11. Wavelength converters according to any one in claim 1 to 10, it is characterized in that, also comprise the optical filter being positioned over described fluorescent material layer light path rear end, this optical filter is used for the green spectrum composition in Stimulated Light and red-light spectrum component separation.
12. Wavelength converters according to any one in claim 1 to 10, it is characterized in that, described fluorescent material layer also comprises the second section, and this second section comprises the second fluorescent material or do not comprise fluorescent material; This second section and the first section are placed side by side, and both are irradiated by this exciting light successively along with the periodic relative motion of fluorescent material layer and described exciting light.
13. 1 kinds of light-emitting devices, is characterized in that, comprising:
For launching the excitation source of exciting light;
According to the Wavelength converter in claim 1 to 12 described in any one, for receiving described exciting light and launching Stimulated Light or Stimulated Light and there is no the mixed light of absorbed residual excitation light.
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|---|---|---|---|
| CN201210038232.7A CN102723422B (en) | 2011-12-31 | 2012-02-20 | Wavelength conversion apparatus and luminous apparatus |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2017121233A1 (en) * | 2016-01-14 | 2017-07-20 | 深圳市光峰光电技术有限公司 | Wavelength conversion device, light source system and projection device |
| CN108535943A (en) * | 2017-03-03 | 2018-09-14 | 深圳市光峰光电技术有限公司 | A kind of light supply apparatus and its projection display system |
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