CN104238249B - A kind of light-emitting device and relevant projecting system - Google Patents
A kind of light-emitting device and relevant projecting system Download PDFInfo
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- CN104238249B CN104238249B CN201310248486.6A CN201310248486A CN104238249B CN 104238249 B CN104238249 B CN 104238249B CN 201310248486 A CN201310248486 A CN 201310248486A CN 104238249 B CN104238249 B CN 104238249B
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Abstract
The embodiment of the invention discloses a kind of light-emitting device, comprising: excitation source, this excitation source is used for outgoing exciting light, and the optical power density of exciting light is more than or equal to 35W/mm
2; Wavelength converter, this Wavelength converter comprises a kind of fluorescent powder, this fluorescent powder is positioned in the light path of the exciting light of excitation source outgoing, for absorbing exciting light with outgoing Stimulated Light, the average excited state of fluorescent powder is less than or equal to 0.1 microsecond after time, and the predominant wavelength of Stimulated Light is more than or equal to 580nm.Embodiments provide a kind of luminescence efficiency higher and light-emitting device and the relevant projecting system thereof of ruddiness can be substituted.
Description
Technical field
The present invention relates to illumination and display technique field, particularly relate to a kind of light-emitting device and relevant projecting system thereof.
Background technology
Fluorescent powder is that one can absorb exciting light, and exciting light is converted to the material of the Stimulated Light of different wave length, and exciting light can be ultraviolet and visible ray etc.Relative to laser and LED emergent light, fluorescent powder emergent light has higher colour rendering index.Wherein, the most frequently used fluorescent powder is yellow fluorescent powder, green light fluorescent powder and red light fluorescent powder etc.
In prior art, the most frequently used red light fluorescent powder material is (Sr, Ca) AlSiN
3: Eu
2+, this red light fluorescent powder can absorb blue light equal excitation light, and the red Stimulated Light of outgoing.But, along with the power of excitation source is more and more higher, when with LASER Light Source being particularly excitation source, the luminous power of this red light fluorescent powder is not improve linearly along with the power raising of exciting light, but present the phenomenon of luminescent saturation, therefore under the effect of the higher exciting light of power, (Sr, Ca) AlSiN
3: Eu
2+the luminescence efficiency of red light fluorescent powder is not high.
Summary of the invention
It is higher and can substitute light-emitting device and the relevant projecting system thereof of ruddiness that the technical matters that the embodiment of the present invention mainly solves is to provide a kind of luminescence efficiency.
Embodiments provide a kind of light-emitting device, comprising:
Excitation source, this excitation source is used for outgoing exciting light, and the optical power density of exciting light is more than or equal to 35W/mm
2;
Wavelength converter, this Wavelength converter comprises a kind of fluorescent powder, this fluorescent powder is positioned in the light path of the exciting light of excitation source outgoing, for absorbing exciting light with outgoing Stimulated Light, the average excited state of fluorescent powder is less than or equal to 0.1 microsecond after time, and the predominant wavelength of Stimulated Light is more than or equal to 580nm.
Preferably, the luminescent center of fluorescent powder comprises Ce
3+.
Preferably, fluorescent powder comprises:
Ca
1-x-y-2zsr
xba
yalSiN
3: Ce
3+ zr
z, wherein R=Li, Na, K, 0≤x<1,0≤y<1,0<z≤0.2, x+y+z<1; And/or
(La
1-x-yr
x)
3si
6n
11: Ce
3+ 3y, wherein R=Y, Gd, Lu, Ca, Sr, Ba, 0≤x < 1,0 < y≤0.2, x+y<1.
Preferably, fluorescent powder is Ce
3+and Eu
2+the fluorescent powder mixed altogether.
Preferably, fluorescent powder comprises Ca
1-x-y-2zsr
xba
yalSiN
3: (Ce
3+ 1-seu
2+ s)
zr
z, wherein R=Li, Na, K, 0≤x<1,0≤y<1,0<z≤0.2, x+y+z<1,0<s<1.
Preferably, light-emitting device also comprises a filtering apparatus, and this filtering apparatus for receiving the emergent light of fluorescent powder, and filters out the light of the predetermined wavelength range in this emergent light, to obtain the ruddiness of predetermined color coordinate.
Preferably, excitation source is LASER Light Source, and this light-emitting device also comprises filtering apparatus, and filtering apparatus is for receiving the emergent light of Wavelength converter and filtering this emergent light.
Preferably, Wavelength converter and filtering apparatus are fluorescent powder color wheel and the optical filtering colour wheel of synchronous axial system.
Preferably, Wavelength converter and filtering apparatus comprise two or more region respectively, each region of Wavelength converter is provided with material of different nature, each region of filtering apparatus is provided with blooming piece of different nature, and the emergent light in each region of Wavelength converter is incident to region corresponding to filtering apparatus.
Present invention also offers a kind of optical projection system, it is characterized in that, comprise above-mentioned light-emitting device.
Compared with prior art, the embodiment of the present invention has following beneficial effect:
In the embodiment of the present invention, find through experiment, if the excited state of fluorescent powder is less than or equal to 0.1 microsecond average after time, light saturated phenomenon is less likely to occur the Stimulated Light that fluorescent powder is excited to produce.When the predominant wavelength of the Stimulated Light of fluorescent powder outgoing is more than or equal to 580nm, because the spectrum of fluorescent powder emergent light is wider, can cover the wavelength coverage of ruddiness, therefore the emergent light of fluorescent powder can replace ruddiness to use.When excitation light power density is more than or equal to 35W/mm
2time, the red light portion of this fluorescent powder emergent light is relative to red light fluorescent powder (Sr, Ca) AlSiN
3: Eu
2+, luminescence efficiency can be higher.
Accompanying drawing explanation
Fig. 1 is (Sr, Ca) AlSiN
3: Eu
2+the luminous intensity of red light fluorescent powder and YAG fluorescent powder is with the change curve of excitation source relative power;
Fig. 2 is YAG fluorescent powder and (Sr, Ca) AlSiN
3: Eu
2+the luminous intensity of red light fluorescent powder is along with the change curve of temperature variation;
Fig. 3 is (Sr, Ca) AlSiN
3: Ce
3+fluorescent powder and (Sr, Ca) AlSiN
3: Eu
2+the change curve that the luminous intensity of fluorescent powder outgoing ruddiness changes along with the optical power density of exciting light;
Fig. 4 is the structural representation of an embodiment of light-emitting device of the present invention;
Fig. 5 be embodiment illustrated in fig. 4 in the structural representation of phosphor powder layer 121;
Fig. 6 is the structural representation of the optical filter 141 of the colour wheel of optical filtering shown in Fig. 4 140.
Embodiment
Fluorescent powder a kind ofly can receive exciting light and be excited the material of the outgoing light different from excitation wavelength.Such as, in prior art, (Sr, Ca) AlSiN
3: Eu
2+be a kind of the most frequently used red light fluorescent powder, the part wherein before colon refers to the molecular formula of the host lattice of this fluorescent powder, and colon part below refers to the element of the luminescent center be entrained in this host lattice.As (Sr, Ca) AlSiN
3: Eu
2+in luminescent center Eu
2+electronics be stimulated and absorb energy, this electrons transits to excited state, and is turning back in the process of ground state by excited state, and this electronics releases energy in the form of light, and produces Stimulated Light.
Fig. 1 is (Sr, Ca) AlSiN
3: Eu
2+red light fluorescent powder and YAG(Y
3al
5o
12: Ce
3+) luminous intensity of fluorescent powder with the change curve of excitation source relative power, the raising of the luminous intensity of YAG fluorescent powder along with the luminous power of exciting light can be seen, substantially linearly improve.And the raising of luminous power along with exciting light, (Sr, Ca) AlSiN
3: Eu
2+the luminous intensity of red light fluorescent powder is not linearly improve thereupon, but when excitation light power is higher, the luminous intensity of red light fluorescent powder almost no longer raises, and presents the phenomenon of luminescent saturation.
In prior art, a kind of viewpoint is thought, (Sr, Ca) AlSiN
3: Eu
2+red light fluorescent powder luminescent saturation phenomenon is due to (Sr, Ca) AlSiN
3: Eu
2+the light absorption of red light fluorescent powder reaches capacity and causes, i.e. (Sr, Ca) AlSiN
3: Eu
2+the luminescent center Eu of red light fluorescent powder
2+all be fully used, even if increase the luminous power of exciting light again, also there is no more luminescent center Eu
2+absorb.But, through the theory calculate of the present inventor, at (Sr, Ca) AlSiN
3: Eu
2+the luminous power of red light fluorescent powder close to time saturated, (Sr, Ca) AlSiN
3: Eu
2+the light absorption of red light fluorescent powder is far from reaching capacity.
In prior art, another viewpoint thinks (Sr, Ca) AlSiN
3: Eu
2+the luminescent saturation phenomenon of red light fluorescent powder causes due to thermal effect.Due to (Sr, Ca) AlSiN
3: Eu
2+the conversion efficiency of red light fluorescent powder is lower, and the energy of quite a few exciting light has been converted into heat, therefore (Sr, Ca) AlSiN
3: Eu
2+the temperature of red light fluorescent powder is relatively high, easily occurs hot quenching phenomenon.Hot quenching phenomenon is that a kind of temperature along with fluorescent powder rises, the phenomenon of the luminous intensity decline of fluorescent powder.And the reason that hot quenching phenomenon occurs is due to the rising along with temperature, the vibration aggravation of the host lattice of phosphor material powder, makes the radiationless transition probability of the electronics of luminescent center increase, luminescence efficiency is reduced.
But the present inventor utilizes YAG fluorescent powder and (Sr, Ca) AlSiN
3: Eu
2+red light fluorescent powder remains on same temperature, and utilizes the exciting light of same power to excite, and its result as shown in Figure 2.Fig. 2 is YAG fluorescent powder and (Sr, Ca) AlSiN
3: Eu
2+the luminous intensity of red light fluorescent powder is along with the change curve of temperature variation, and as shown in Figure 2, when temperature is lower than 90 DEG C, the relative luminous intensity of two kinds of fluorescent powder is substantially identical.And when temperature is higher than 90 DEG C, the relative luminous intensity of YAG fluorescent powder on the contrary will lower than (Sr, Ca) AlSiN
3: Eu
2+the relative luminous intensity of red light fluorescent powder, and along with the rising of temperature, it is faster that the relative luminous intensity of YAG fluorescent powder declines, and therefore in fact, the hot saturation effect of YAG fluorescent powder is relative to (Sr, Ca) AlSiN
3: Eu
2+red light fluorescent powder is obvious all the better.In theory, hot quenching phenomenon is relevant with the host lattice structure of phosphor material powder, and the rigidity of the crystal structure of host lattice is higher, is more not easy vibration, is more not easy to produce hot quenching phenomenon.And (Sr, Ca) AlSiN
3: Eu
2+host lattice (Sr, the Ca) AlSiN of red light fluorescent powder
3crystal structure there is extremely strong structural rigidity, the host lattice Y of YAG fluorescent powder
3al
5o
12structural rigidity to be weaker than (Sr, Ca) AlSiN
3structural rigidity, therefore in theory, YAG fluorescent powder should more easily produce hot quenching phenomenon, and its hot saturation effect should be more obvious.Therefore, theoretical and experimental data all proves: (Sr, Ca) AlSiN
3: Eu
2+the luminescent saturation phenomenon of red light fluorescent powder neither cause due to thermal effect.
And in above-mentioned experiment, YAG(Y
3al
5o
12: Ce
3+) fluorescent powder and (Sr, Ca) AlSiN
3: Eu
2+the difference that of red light fluorescent powder is larger is that the luminescent center element of the two is different, and excited state difference after time of the two luminescent center element is larger: Ce
3+excited state after time be nanosecond, and Eu
2+excited state Microsecond grade after time.Therefore by above-mentioned experiment, the present inventor thinks (Sr, Ca) AlSiN
3: Eu
2+the luminescent saturation phenomenon of red light fluorescent powder may be due to (Sr, Ca) AlSiN
3: Eu
2+excited state after time of red light fluorescent powder is long to cause.
Inventor utilizes (Sr, Ca) AlSiN
3: Ce
3+excite under the irradiation of exciting light, and by (Sr, Ca) AlSiN
3: Ce
3+emergent light filtering apparatus filter, the ruddiness of predetermined color coordinate can be obtained, and by this ruddiness and (Sr, Ca) AlSiN
3: Eu
2+the ruddiness of fluorescent powder outgoing compares, and its result as shown in Figure 3.Fig. 3 is (Sr, Ca) AlSiN
3: Ce
3+fluorescent powder and (Sr, Ca) AlSiN
3: Eu
2+the change curve that the luminous intensity of fluorescent powder outgoing ruddiness changes along with the optical power density of exciting light, optical power density is the power of light source emergent light in unit area, as shown in Figure 3, is less than 35W/mm in the optical power density of exciting light
2time, along with the raising of the optical power density of exciting light, the luminous intensity of two kinds of fluorescent powder improves gradually, but (Sr, Ca) AlSiN
3: Ce
3+luminous intensity will lower than (Sr, Ca) AlSiN
3: Eu
2+luminous intensity.35W/mm is more than or equal in the optical power density of exciting light
2time, (Sr, Ca) AlSiN
3: Ce
3+the luminescent saturation effect of fluorescent powder becomes obvious, (Sr, Ca) AlSiN
3: Ce
3+luminous intensity become higher than (Sr, Ca) AlSiN
3: Eu
2+luminous intensity.Due to (Sr, Ca) AlSiN
3: Ce
3+with (Sr, Ca) AlSiN
3: Eu
2+host lattice identical, difference is luminescent center, and Ce
3+excited state far to be shorter than Eu after time
2+excited state after time, therefore, the luminescent saturation phenomenon of fluorescent powder is relevant for after time with the excited state of luminescent center, and the excited state of luminescent center is shorter for after time, is more not easy to occur luminescent saturation.
Because the excited state of luminescent center is shorter for after time, be more not easy to occur luminescent saturation, any luminescent center excited state twilight sunset compares Ce
3+short fluorescent powder is all more difficult there is luminescent saturation phenomenon.Due to Ce
3+excited state after time be 0.1 millisecond to 0.01 millisecond, when the power of exciting light is at 35Wmm
2time above, as long as the excited state of fluorescent powder is less than or equal to 0.1 millisecond after time, this fluorescent powder is all relative to (Sr, Ca) AlSiN
3: Eu
2+red light fluorescent powder can weaken luminescent saturation phenomenon, thus has higher luminous intensity.
In prior art, although be used as ruddiness after the emergent light of YAG fluorescent powder can be filtered, but the predominant wavelength of YAG fluorescent powder is shorter, general at about 560nm, and the wavelength coverage of ruddiness is generally more than 600nm, if therefore the emergent light of YAG fluorescent powder is used as ruddiness, most light can be filtered out, and make the utilization factor of light very low.
And in an experiment, the present inventor finds (Sr, Ca) AlSiN
3: Ce
3+fluorescent powder is not only not easy to occur light saturated phenomenon, and the predominant wavelength of its emergent light just can reach 590nm, therefore (Sr, Ca) AlSiN
3: Ce
3+when fluorescent powder uses as ruddiness, the loss of light can be reduced.This is because the predominant wavelength of the Stimulated Light of fluorescent powder outgoing depends primarily on its luminescent center, also can be subject to the impact of host lattice type simultaneously.Similarly, Ca
1-x-y-2zsr
xba
yalSiN
3: Ce
3+ zr
z(wherein R=Li, Na, K, 0≤x<1,0≤y<1,0<z≤0.2, x+y+z<1), (La
1-x-yr
x)
3si
6n
11: Ce
3+ 3y(at least one in wherein R=Y, Gd, Lu, Ca, Sr, Ba, 0≤x < 1, x+y<1,0 < y≤0.2) etc. are with Ce
3+for the predominant wavelength of the emergent light of the fluorescent powder of luminescent center is all at more than 580nm.
In addition, in order to make fluorescent powder emergent light closer to ruddiness, Ce can also be adopted
3+with Eu
2+the method of mixing altogether, Ce
3+with Eu
2+mix altogether is by Ce
3+with Eu
2+co-doped in the gap of same host lattice, such as, Ca
1-x-y-2zsr
xba
yalSiN
3: (Ce
3+ 1-seu
2+ s)
zr
z(wherein R=Li, Na, K; 0≤x≤1; 0≤y≤1; 0≤z≤0.2, x+y+z<1,0<s<1).Due to Eu
2+existence, the red color light component in fluorescent powder emergent light increases, therefore Ce
3+with Eu
2+send the color of mixed light closer to redness.Further, due to Ce
3+with Eu
2+when mixing altogether, the two is close, and distance is very little, Ce
3+the shorter a part of light of emergent light medium wavelength can by Eu
2+absorb and outgoing ruddiness, make the efficiency of fluorescent powder outgoing ruddiness higher.Although yellow fluorescent powder and red light fluorescent powder carry out mixing also similar effect, relative to the Ce mixed altogether
3+with Eu
2+, the distance between fluorescent powder grain is much bigger, makes Ce
3+with Eu
2+distance relatively far away, therefore the absorption efficiency of red light fluorescent powder to the short wavelength's part in the emergent light of yellow fluorescent powder is very low.Certainly, in order to ensure to be not easy to occur luminescent saturation phenomenon under high power density, average excited state to be less than and to equal 0.1 millisecond after time.Here average excited state after time is Ce
3+with Eu
2+the mean value of excited state after time of all luminescent center elements, in other embodiment of the embodiment of the present invention, a kind of average excited state of fluorescent powder is the mean value of excited state after time of all luminescent center in this fluorescent powder after time.
Fig. 4 is the structural representation of an embodiment of light-emitting device of the present invention, and as shown in Figure 4, light-emitting device comprises excitation source 110, fluorescent powder color wheel 120, lens 130, optical filtering colour wheel 140.
Here excitation source 110 is for outgoing exciting light L1.Particularly, excitation source 110 comprises the LASER Light Source 111 of laser diode arrangement, the laser array of such as blue light laser diode arrangement.Because the optical power density of laser is relatively high, the optical power density of the exciting light L1 of LASER Light Source outgoing also can be higher, and the exciting light of this high optical power density is easy to cause (Sr, Ca) AlSiN
3: Eu
2+the luminescent saturation of red light fluorescent powder.It is easily understood that excitation source 110 also can be other light sources such as LED.
Because the light-emitting area of laser array is larger, be unfavorable for that subsequent optical device processes its emergent light, therefore light-emitting device also comprises lens 112, these lens 112 can be collected the exciting light L1 of laser array light source outgoing and focus to fluorescent powder color wheel 120, reduce the sectional area of light beam.Like this, the optical power density of the light beam after lens 112 focus on can reach 35W/mm
2above.Certainly, in other embodiment of the embodiment of the present invention, when the light receiving area light-emitting area that is larger or light-emitting device of follow up device is less, lens 112 can not be set.
Fluorescent powder color wheel 120 comprises phosphor powder layer 121, and this phosphor powder layer 121 is positioned in the light path of excitation source 110 emergent light, can absorb exciting light L1 and outgoing Stimulated Light L2.Particularly, Fig. 5 be embodiment illustrated in fig. 4 in the structural representation of phosphor powder layer 121, as shown in Figure 5, phosphor powder layer 121 comprises R, G, B tri-regions, and Zone R territory is provided with (Sr, Ca) AlSiN
3: Ce
3+fluorescent powder, therefore the exciting light of higher optical power density can be born in this region, and is not easy to produce light saturated phenomenon; G region is provided with green light fluorescent powder, can absorb the green Stimulated Light of exciting light L1 and outgoing; B region is provided with transparent region, can transmit blue laser.Certainly, (Sr, Ca) AlSiN here
3: Ce
3+fluorescent powder can also replace to the fluorescent powder of other kind or the potpourri of two or more fluorescent powder, as long as ensure that the average excited state of the fluorescent powder replaced is less than or equal to 0.1 millisecond after time, and the predominant wavelength of Stimulated Light is more than or equal to 580nm.
Can be positioned at successively in the light path of excitation source 110 emergent light in order to R, G, B tri-regions can be made, fluorescent powder color wheel 120 also comprises a drive unit 122, such as motor, this drive unit 122 can drive phosphor powder layer 121 to rotate, act on this three regions with the hot spot making exciting light be formed on above-mentioned R, G, B tri-regions along predetermined circular trace, the problem that exciting light L1 long duration of action causes the temperature of this position to raise in the same position of fluorescent powder color wheel can be avoided simultaneously.In other embodiment of the embodiment of the present invention, fluorescent powder color wheel can replace with other Wavelength converter, such as Wavelength converter can not be the wheel shape in the present embodiment, such as Wavelength converter is rectangle, its R, G, B tri-regions are successively in linear array, and now drive unit also can drive Wavelength converter to move with the form of horizontal reciprocating movement; Wavelength converter can also only include a region or two or more region, as long as have at least a region to comprise above-mentioned (Sr, Ca) AlSiN
3: Ce
3+fluorescent powder.When Wavelength converter only includes a region, Wavelength converter also can not arrange drive unit.
The emergent light of fluorescent powder is lambertian distribution, and dispersion angle is comparatively large, and in communication process, the sectional area of light beam can become large, and easily cause damage, therefore light-emitting device further comprises lens 130, and these lens 130 are for collimating the emergent light L2 of fluorescent powder color wheel 120.Certainly, light utilization efficiency is required it is not very high light-emitting device, also lens 130 can not be set.
The chromaticity coordinates of the emergent light of fluorescent powder color wheel 120 might not be suitable for the application such as Projection Display, and therefore light-emitting device further comprises optical filtering colour wheel 140, can filter the emergent light of fluorescent powder color wheel 120.This optical filtering colour wheel 140 comprises optical filter 141 and drive unit 142.Fig. 6 is the structural representation of the optical filter of the colour wheel of optical filtering shown in Fig. 4 140, as shown in Figure 4, optical filter 141 comprises R, G, B tri-regions, this R, G, B tri-regions are corresponding with R, G, B tri-regions of fluorescent powder color wheel 120, and the emergent light in each region of fluorescent powder color wheel 120 can be incident to the corresponding region of optical filter colour wheel 140.R, G, B region of optical filter 141 is respectively arranged with Red lightscreening plate, green color filter and diffusion sheet, can filter or scattering red Stimulated Light, green Stimulated Light, blue laser respectively, to obtain the ruddiness of predetermined color coordinate, green glow and blue light.Similarly, can be positioned at successively in the light path of the emergent light of fluorescent powder color wheel 120 to make three regions of the optical filter 141 of optical filter colour wheel 140, optical filtering colour wheel 140 is also provided with drive unit 142 and rotates to drive optical filter 141, and drive unit 122 synchronous axial system of drive unit here 142 and fluorescent powder color wheel 120, to make R, G, B region of two colour wheels can one_to_one corresponding.
In the present embodiment, because the Zone R territory of fluorescent powder color wheel 120 is set to (Sr, Ca) AlSiN
3: Ce
3+fluorescent powder, the exciting light of higher-wattage can be tolerated and not produce light saturated, therefore light-emitting device can adopt powerful laser array light source as excitation source, and the ruddiness of final outgoing higher brightness, overcome the problem of the ruddiness luminance shortage of traditional three primary light source.
The embodiment of the present invention additionally provides a kind of optical projection system, and this optical projection system comprises excitation source in above-described embodiment and Wavelength converter.
The foregoing is only embodiments of the present invention; not thereby the scope of the claims of the present invention is limited; every utilize instructions 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 (10)
1. a light-emitting device, is characterized in that, comprising:
Excitation source, this excitation source is used for outgoing exciting light, and the optical power density of described exciting light is more than or equal to 35W/mm
2;
Wavelength converter, this Wavelength converter comprises a kind of fluorescent powder, this fluorescent powder is positioned in the light path of the exciting light of described excitation source outgoing, for absorbing described exciting light with outgoing Stimulated Light, the average excited state of described fluorescent powder is less than or equal to 0.1 microsecond after time, and the predominant wavelength of described Stimulated Light is more than or equal to 580nm.
2. light-emitting device according to claim 1, is characterized in that: the luminescent center of described fluorescent powder comprises Ce
3+.
3. light-emitting device according to claim 2, is characterized in that, described fluorescent powder comprises:
Ca
1-x-y-2zsr
xba
yalSiN
3: Ce
3+ zr
z, wherein R=Li, Na, K, 0≤x<1,0≤y<1,0<z≤0.2, x+y+z<1; And/or
(La
1-x-yr
x)
3si
6n
11: Ce
3+ 3y, wherein R=Y, Gd, Lu, Ca, Sr, Ba, 0≤x < 1,0 < y≤0.2, x+y<1.
4. light-emitting device according to claim 2, is characterized in that, described fluorescent powder is Ce
3+and Eu
2+the fluorescent powder mixed altogether.
5. light-emitting device according to claim 4, is characterized in that, described fluorescent powder comprises Ca
1-x-y-2zsr
xba
yalSiN
3: (Ce
3+ 1-seu
2+ s)
zr
z, wherein R=Li, Na, K, 0≤x<1,0≤y<1,0<z≤0.2, x+y+z<1,0<s<1.
6. light-emitting device according to claim 1, it is characterized in that, described light-emitting device also comprises a filtering apparatus, and this filtering apparatus is for receiving the emergent light of described fluorescent powder, and filter out the light of the predetermined wavelength range in this emergent light, to obtain the ruddiness of predetermined color coordinate.
7. light-emitting device according to any one of claim 1 to 5, it is characterized in that: described excitation source is LASER Light Source, this light-emitting device also comprises filtering apparatus, and described filtering apparatus is for receiving the emergent light of described Wavelength converter and filtering this emergent light.
8. light-emitting device according to claim 7, is characterized in that: described Wavelength converter and filtering apparatus are fluorescent powder color wheel and the optical filtering colour wheel of synchronous axial system.
9. light-emitting device according to claim 8, it is characterized in that, described Wavelength converter and filtering apparatus comprise two or more region respectively, each region of Wavelength converter is provided with material of different nature, each region of filtering apparatus is provided with blooming piece of different nature, and the emergent light in each region of described Wavelength converter is incident to region corresponding to described filtering apparatus.
10. an optical projection system, is characterized in that, comprises the light-emitting device as described in any one of claim 1 to 9.
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