WO2019006979A1 - 波长转换装置和激光荧光转换型光源 - Google Patents

波长转换装置和激光荧光转换型光源 Download PDF

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Publication number
WO2019006979A1
WO2019006979A1 PCT/CN2017/114707 CN2017114707W WO2019006979A1 WO 2019006979 A1 WO2019006979 A1 WO 2019006979A1 CN 2017114707 W CN2017114707 W CN 2017114707W WO 2019006979 A1 WO2019006979 A1 WO 2019006979A1
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Prior art keywords
fluorescent
wavelength conversion
conversion device
light
layer
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Ceased
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PCT/CN2017/114707
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English (en)
French (fr)
Inventor
陈雨叁
李乾
许颜正
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Shenzhen Appotronics Corp Ltd
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Appotronics Corp Ltd
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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
    • F21K9/20—Light sources comprising attachment means
    • 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]

Definitions

  • the present invention relates to a wavelength conversion device and a laser fluorescence conversion type light source using the same.
  • laser light sources have become an important development direction of projection light sources and illumination sources.
  • the mainstream technology is mainly divided into two types, one is RGB three-color laser technology, and the other is laser phosphor technology.
  • the three-color laser technology adopts red, green and blue three-color laser modules, and has the advantages that the three-color components of R, G, and B can be independently adjusted, and the utilization rate of laser light energy reaches 100%.
  • the "speckle" defect is likely to occur in the projected picture, and the human eye can view the picture with speckle defects for a long time, which is likely to damage the eyes and damage the eyesight.
  • the technical solution of the laser phosphor technology concentrates the blue laser on a high-speed rotating fluorescent wheel, and converts the blue laser into other colors such as red-green light through a wavelength conversion material such as a phosphor on the fluorescent wheel. Get color output light.
  • the advantage is that there is no speckle problem, and the high-speed rotating fluorescent wheel is beneficial to the loss of heat.
  • due to the dependence of the technical solution on the fluorescent wheel its application in a frequently vibrating environment (such as in-vehicle equipment) is limited, and product reliability is also reduced.
  • the present invention is intended to provide a novel wavelength conversion device and a laser-excited fluorescent material light source using the package structure.
  • a wavelength conversion device includes a package assembly and a fluorescent component that contains a fluorescent material and is capable of converting incident light into emitted light of different wavelengths.
  • the package assembly includes a housing formed into a U-shape by two oppositely disposed sides and a closed end surface, the inner surface of the housing being a reflective surface, between the two sides of the housing Two opposite openings for the wavelength a light incident end of the changing device, an opening opposite to the closed end surface is a light exit end of the wavelength conversion device, and the two light incident ends are respectively provided with a first optical light that allows a light beam of a specific wavelength and/or an incident angle to pass through membrane.
  • the fluorescent component is disposed inside the housing and connected to the closed end surface, the fluorescent component is formed into a sheet shape, and an upper surface and a lower surface of the fluorescent component respectively face the two light incident ends An optical film.
  • the package assembly further includes a light transmissive heat conductive member, one surface of the light transmissive heat conductive member is coupled to the fluorescent component and located between the fluorescent component and the first optical film, the transparent heat conduction The piece is connected to the closed end face.
  • the light-transmitting heat-conducting member has a groove opening toward the fluorescent component, the groove extending along a length direction of the fluorescent component and having a rectangular shape in a cross section perpendicular to the length direction, the groove and The fluorescent component forms a light tunnel extending along a length of the fluorescent component.
  • a second optical film is disposed on a sidewall surface of the groove or a sidewall surface and a bottom surface of the groove, and the second optical film is capable of reflecting at least the emitted light converted by the fluorescent component.
  • the thickness of the fluorescent component gradually decreases as it approaches the light exit end, and the thickness of the light-transmitting heat-conducting member and the depth of the groove gradually increase as approaching the exit end.
  • the fluorescent component has a multi-layered structure including a first fluorescent layer, a bonding reflective layer and a second fluorescent layer which are sequentially laminated, and the lower surface and the upper surface of the adhesive reflective layer are respectively adhered Connecting to the first fluorescent layer and the second fluorescent layer, and capable of reflecting light beams from the first fluorescent layer and the second fluorescent layer, respectively.
  • the first phosphor layer is capable of wavelength conversion of a light beam in a first wavelength range
  • the second phosphor layer is capable of wavelength conversion of a light beam in a second wavelength range.
  • the first optical film disposed on the first fluorescent layer side of the wavelength conversion device is a first angle selective filter film, and the first angle selective filter film can only transmit through the first wavelength range a light beam incident at an incident angle within a predetermined range;
  • the first optical film disposed on the second fluorescent layer side of the wavelength conversion device is a second angle selective filter film, the second angle selection
  • the filter film is only capable of transmitting a light beam incident at an incident angle within the predetermined range within the second wavelength range.
  • the two first optical films of the wavelength conversion device are disposed obliquely to each other, and the overall thickness of the wavelength conversion device gradually becomes smaller as it approaches the light exit end.
  • the upper surface and the lower surface of the fluorescent component are respectively parallel to the facing first optical film.
  • the fluorescent component has a multi-layered structure including a first fluorescent layer, a bonding reflective layer, and a second fluorescent layer which are sequentially stacked, and the lower surface and the upper surface of the adhesive reflective layer are respectively Bonding to the first fluorescent layer and the second fluorescent layer, and capable of reflecting light beams from the first fluorescent layer and the second fluorescent layer, respectively.
  • the two first optical films of the wavelength conversion device are disposed obliquely to each other such that an overall thickness of the wavelength conversion device gradually decreases as approaching the light exit end, and the multilayer structure is The surface and the lower surface are respectively parallel to the facing first optical film.
  • the fluorescent component is constructed of a multiphase fluorescent ceramic.
  • the multiphase fluorescent ceramic may be, for example, a composite ceramic of YAG:Ce and Al 2 O 3 .
  • the fluorescent component is composed of single crystal or polycrystalline transparent fluorescent ceramic or fluorescent glass, and the surface of the fluorescent component is subjected to surface roughening treatment.
  • the housing is preferably made of a metallic material.
  • the light-transmitting heat conductive member is preferably made of sapphire.
  • the length of the fluorescent component is no more than 3/4 of the length of the housing.
  • the optical film that allows a particular beam of light to pass through is an angle selective filter film that is only capable of transmitting a beam of light incident at an angle of incidence within a predetermined range over a predetermined range of wavelengths.
  • the angle selective filter film is a blue light transmitting film that can only be selected by the angle of the blue light beam incident at an incident angle in the range of -8.5° to +8.5°.
  • the first phosphor layer and the second phosphor layer may be the same phosphor layer.
  • the present invention also provides a laser fluorescence conversion type light source, characterized in that the laser fluorescence conversion type light source comprises a laser device and the above-mentioned wavelength conversion device, and the laser device is used as an incident light source of the wavelength conversion device.
  • the laser beam emitted by the laser device can be irradiated to the upper and lower surfaces of the fluorescent component through the optical film from opposite sides of the housing.
  • the present invention it is possible to realize a fixed package of a fluorescent component, thereby having better vibration resistance during light emission.
  • the fluorescent component is disposed in the cavity in the housing, the two surfaces of the fluorescent component respectively face the first optical film of the two opposite openings between the sides of the housing, and the inner surface of the housing is disposed a reflecting surface that allows incident light to be incident from both surfaces of the fluorescent component to undergo light conversion, and thereafter continuously reflects from the opening of the package assembly
  • the light exit end exits to obtain a high lumen density exit light at the open light exit end.
  • FIG. 1 is a side view showing a wavelength conversion device according to a first embodiment of the present invention.
  • Fig. 2 is a schematic end view showing the light exit end of the wavelength conversion device shown in Fig. 1.
  • Fig. 3 is a side view showing a wavelength conversion device according to a second embodiment of the present invention.
  • Fig. 4 is a schematic end view showing the light exit end of the wavelength conversion device shown in Fig. 3.
  • Fig. 5 is a schematic end view showing a light exit end of a wavelength conversion device according to a modification of the second embodiment of the present invention.
  • Fig. 6 is a side view showing a wavelength conversion device according to a third embodiment of the present invention.
  • FIG. 7 A and b of Fig. 7 are schematic diagrams showing end faces of the left end portion and the right side light exit end of the wavelength conversion device shown in Fig. 6, respectively.
  • Fig. 8 is a side view illustrating a wavelength conversion device according to a fourth embodiment of the present invention.
  • Figure 9 is a schematic end view of a light exit end of a wavelength conversion device according to a fourth embodiment of the present invention.
  • Fig. 10 is a side view illustrating a wavelength conversion device according to a fifth embodiment of the present invention.
  • FIG. 1 shows a side view of a wavelength conversion device 100 in accordance with a first embodiment of the present invention.
  • 2 is a schematic view showing an end face of a light exit end of a wavelength conversion device 100 according to a first embodiment of the present invention.
  • the wavelength conversion device 100 includes a package assembly including a housing 101 and a fluorescent assembly 102 disposed within the housing 101.
  • the horizontal direction in FIG. 1 is referred to as the longitudinal direction of the casing 101 and the fluorescent member 102
  • the vertical direction in FIG. 1 is referred to as the thickness direction of the casing 101 and the fluorescent member 102
  • the vertical direction is called the housing 101 and the fluorescent The width direction of the light assembly 102.
  • the housing 101 includes two opposite side faces 103 extending in the length direction (to illustrate the internal structure of the package assembly 101, the opposite side 103 of the package assembly 101 is not illustrated in the side view of Fig. 1, on the side of the following embodiments The same is true in the view) and the closed end face 104 connecting the ends of the two opposite sides.
  • the two opposite side faces 103 and the closed end face 104 are formed together in a U shape.
  • the casing 101 is formed of a material having high thermal conductivity.
  • the casing 101 may be made of a metal material such as aluminum or copper, or may be made of a ceramic material having a high thermal conductivity.
  • the inner surface of the casing 101 i.e., the inner surface of the two opposing surfaces 103 in Fig. 2 and the inner surface of the closed end surface 104 in Fig. 1) is a reflecting surface provided with a total reflection dielectric film or a specular reflection film. A silver plated film having a high reflectance of 98% or more is preferable.
  • the U-shaped casing 101 has two opposite openings between the opposite sides and is used as a light incident end of the wavelength conversion device 100 to receive incident light.
  • the opening of the housing 101 opposite the closed end face 104 is used to make the light exit end to be illuminated.
  • the above-mentioned openings on opposite sides of the casing 101, that is, the two light incident ends are respectively provided with a first optical film 105 which allows only a specific light beam to pass therethrough. Therefore, the surface of the first optical film 105 becomes the light incident surface of the wavelength conversion device 100.
  • the first optical film 105 is an angle selective filter film that transmits only light beams incident at a predetermined range of incident angles over a predetermined range of wavelengths.
  • the angle selective filter film may be a blue light transmissive film selected only by the angle of blue light incident at an incident angle in the range of -8.5° to +8.5°. It should be understood that the range of the above incident angles is merely an example, and may be other angle ranges.
  • the incident light is incident through the first optical film 105 to the inside of the package assembly.
  • the fluorescent component 102 is disposed in a cavity in the housing 101 and is coupled to the closed end face 104 for at least partially converting incident incident light in a certain wavelength range into a laser light in other wavelength ranges to achieve wavelength Conversion.
  • the fluorescent component 102 can be constructed of a multiphase fluorescent ceramic.
  • the multiphase ceramic refers to a ceramic matrix composite material, which is a small branch under the broad category of "composite material”.
  • the so-called “complex phase” mainly refers to the presence of two or more substances "phases" in the material composition, so it is also called “multiphase ceramics". There is a large amount of scattering phase inside the fluorescent component 102 composed of such a multiphase fluorescent ceramic material.
  • the “scattering phase” refers to a second phase material different from the main phase material, and its function is to form a scattering effect on the incident excitation light, thereby increasing the absorption rate of the excitation light, thereby improving the light conversion to the excitation light. effectiveness. Therefore, the ceramic main phase and the scattering phase together constitute a multiphase ceramic material, and the scattering phase is dispersed as a second phase material in the ceramic main phase. Since there are a large number of such scattering phases, the light beam is scattered multiple times when propagating inside the fluorescent component 102, and thus the light transmittance is low.
  • the multiphase fluorescent ceramic material may be any suitable complex phase fluorescent ceramic material known, such as a composite ceramic composed of YAG:Ce (or LuAG:Ce) and Al 2 O 3 , wherein Al 2 O 3 is a ceramic main phase, YAG :Ce acts as a scattering center while acting as a luminescent center.
  • the third phase can be added as a separate scattering phase on the basis of the main phase material and the second phase material.
  • YAG: Ce and Al 2 O 3 composite ceramics are preferred, with a blue light absorption of between 85% and 95%, and a light transmission of 1 mm thick YAG:Ce and Al 2 O 3 complex ceramics ( The visible light rate is only 65% to 75%.
  • the fluorescent component 102 can also be formed from a single crystal or polycrystalline transparent fluorescent ceramic, such as a YAG:Ce single crystal or a polycrystalline ceramic.
  • the fluorescent component 102 may also be composed of fluorescent glass.
  • the fluorescent glass 102 may be formed by mixing and sintering a phosphor, a glass frit, and an organic carrier, so that the phosphor is embedded in the glass forming the continuous phase, wherein the glass frit preferably uses a glass having a high refractive index and high thermal stability.
  • borosilicate lead-free glass borosilicate lead-free glass.
  • other known fluorescent glasses can also be selected.
  • the fluorescent member 102 is composed of fluorescent glass or single crystal or polycrystalline ceramic, it is preferable that the upper and lower surfaces of the fluorescent member 102 are subjected to surface roughening treatment, so that the emission rate of the laser light can be improved.
  • the fluorescent member 102 is formed in the shape of a rectangular parallelepiped whose upper and lower surfaces face the first optical film 105, respectively.
  • the thickness may be within 300 ⁇ m; when the fluorescent component 102 is composed of single crystal or polycrystalline transparent fluorescent ceramic or fluorescent glass, the thickness is thick, in the range of 0.3 to 5 mm.
  • the fluorescent member 102 has a length in the longitudinal direction of 8 to 15 mm and a width in the width direction of 1.5 to 4 mm.
  • the length of the fluorescent component 102 is equal to or less than 3/4 of the length of the housing 101 such that light emitted by the fluorescent component 102 can undergo sufficient multiple reflections before exiting from the exit end of the wavelength conversion device 100. Achieve uniform light output.
  • one end face of the fluorescent member 102 of the rectangular parallelepiped is attached to the closed end face 104 of the casing 101.
  • the two sides of the fluorescent component 102 can be coupled to the two opposing sides 103 of the housing 101.
  • the manner in which the fluorescent component 102 is coupled to the housing 101 can be any connection of known low thermal resistance, such as soldering, high thermal conductivity adhesive bonding, and the like.
  • the upper and lower surfaces of the fluorescent component 102 are spaced apart from the first optical film 105, i.e., are not in contact.
  • the laser light 110 emitted from the laser light emitting array 120 is irradiated to the upper and lower surfaces of the fluorescent member 102 through the first optical film 105.
  • the incident light 110 forms a center of illumination at the surface spot of the fluorescent component 102.
  • the laser is emitted from the illuminating center at a full angle, wherein a 2 ⁇ azimuth laser is emitted toward the outside of the fluorescent component 102 to enter the internal cavity of the package assembly 101; and another 2 ⁇ azimuth laser is directed toward the interior of the fluorescent component 102.
  • the thickness of the fluorescent component 102 is very thin, this portion is emitted by the laser from the opposite side surface of the fluorescent component 102 and also enters the internal cavity of the housing 101. All of the outgoing light entering the cavity cannot pass through the first optical film 105 due to changes in angle and wavelength range, and is thus reflected multiple times by the highly reflective inner surface of the casing 101 in the cavity, after sufficient light combination and uniformity After the light, it is finally emitted from the light exit end (the right end in FIG. 1) of the wavelength conversion device 100.
  • the fluorescent component 102 is fixedly coupled to the housing 101, and thus has stability capable of adapting to a vibration environment. Further, the wavelength conversion device 100 of the present embodiment is capable of wavelength-converting incident light from the opposite sides and emitting the emitted light from one end surface having a small area, so that it has a high lumen density light output capability.
  • FIG. 3 shows a side view of a wavelength conversion device 200 in accordance with a second embodiment of the present invention.
  • FIG. 4 shows an end view of a wavelength conversion device 200 in accordance with a second embodiment of the present invention.
  • the wavelength conversion device 200 according to the second embodiment of the present invention is different from the wavelength conversion device 100 of the first embodiment in that the package assembly further includes a light-transmitting heat-conducting member disposed between the fluorescent member 202 and the first optical film 205. 206. Except for this, the wavelength conversion device 200 is almost the same as the configuration of the wavelength conversion device 100 of the first embodiment, and thus the repeated description will be omitted in the following description.
  • the light-transmitting heat conductive member 206 is formed in a rectangular parallelepiped shape extending along the length direction of the fluorescent member 202.
  • the length of the light-transmitting heat-conducting member 206 is the same as the length of the housing 201.
  • the surface of the light-transmitting heat-conducting member 206 facing the fluorescent member 202 is connected to the fluorescent member 202.
  • one end face of the light transmissive heat conducting member 206 is coupled to the closed end face 204 of the housing 201.
  • both sides of the light-transmitting heat-conducting member 206 may be coupled to the two opposite side faces 203 of the housing 201.
  • the light-transmitting heat-conducting member 206 is also in contact with the first optical film 205.
  • the light-transmitting heat-conducting member 206 and the fluorescent component 202 can be glued or bonded.
  • the type of connection can also be bonded by optical glue with high transmittance. Photogels and bonding are preferred.
  • the light transmissive heat conductive member 206 has a recess 207 that opens toward the fluorescent component 202.
  • the groove 207 extends in the longitudinal direction at the surface to which the fluorescent member 202 is attached, and has a rectangular shape in a section perpendicular to the longitudinal direction.
  • the rectangular recess 207, together with the fluorescent component 202 forms an optical channel that is internally filled with an air medium that extends in the length direction.
  • a second optical film 208 is disposed on the side wall surface of the rectangular recess 207.
  • the second optical film 208 is at least capable of reflecting the exiting light converted by the fluorescent component 202.
  • the second optical film 208 can be the same optical film as the first optical film 205.
  • the light-transmitting heat conductive member 206 is formed of a material having high light transmittance and high thermal conductivity such as quartz and sapphire, of which sapphire is preferable.
  • the light-transmissive heat-conducting member 206 connected to both the fluorescent component 202 and the housing 201 can function as a heat sink to improve the heat dissipation performance of the fluorescent component 202.
  • incident light emitted from the incident light source is transmitted to the upper and lower surfaces of the fluorescent component 202 through the first optical film 205 and the light-transmitting heat-transfer member 206.
  • the laser light emitted from the fluorescent element 202 cannot pass through the first optical film 205 and the second optical film 208 but is reflected by them. Therefore, the laser light can only be reflected multiple times in the air medium of the groove 207 and the light-transmitting heat-conducting member 206, and after sufficient light combining and light-shazing, finally exits from the opening of the housing 201 (in FIG. 3). The right end) exits.
  • the sidewall surface and the bottom surface of the recess 207 are each provided with a second optical film 208.
  • the laser light emitted from the fluorescent component 202 cannot pass through the second optical film 208, and the laser light is prevented from entering the inside of the light-transmitting heat-conductive member 206 to the utmost extent.
  • the laser light can only propagate in the air medium of the recess 207 toward the exit end.
  • the second optical film 208 is provided only on the side wall surface of the groove 207, the light loss can be further reduced, and the light extraction efficiency can be improved.
  • FIG. 6 shows a side view of a wavelength conversion device 300 in accordance with a second embodiment of the present invention.
  • 7 is a left side end view of the wavelength conversion device 300 of FIG. 6, and
  • FIG. 7b is a left side end view of the wavelength conversion device 300 of FIG.
  • the wavelength conversion device 300 according to the third embodiment of the present invention is different from the wavelength conversion device 200 of the second embodiment in that the thickness of the fluorescent component 302 gradually decreases as it gradually approaches the light exit end, and the light transmissive heat conductive member 306 Thickness and depth of groove 307 (direction and fluorescence The thickness of the assembly is the same, that is, the vertical direction in Fig. 6) gradually increases as it gradually approaches the light exit end. Except for this, the configuration of the wavelength conversion device 300 and the wavelength conversion device 200 of the second embodiment are almost the same, and thus the overlapping description will be omitted in the following description.
  • the exit end of the wavelength conversion device emits a spot
  • the light of the spot of the exit end mainly comes from two optical channels between the upper and lower surfaces of the fluorescent component and the first optical film, since light rarely occupies from the inside of the fluorescent component.
  • the length direction propagates to the exit end, thus causing the light spot cross-sectional light distribution of the light-emitting end of the wavelength conversion device to be uneven, that is, the middle portion of the spot corresponding to the fluorescent component is dark relative to the upper and lower portions of the spot.
  • the thickness of the fluorescent component 202 of the wavelength conversion device 200 remains unchanged, which may result in a more pronounced dark line in the middle of the spot of the light exit end.
  • the thickness of the fluorescent member 302 is gradually decreased as it gradually approaches the exit end, and the thickness of the light-transmitting heat-conducting member 306 and the depth of the groove 307 are set to gradually approach the exit.
  • the end gradually increases, so that the area ratio of the air medium in the groove 307 in the exit end face of the wavelength conversion device 300 is increased as shown in b of FIG. Therefore, the light uniformity of the device can be improved.
  • a and b of Fig. 7 an example in which the depth of the groove 307 gradually increases from zero toward the exit end from the left end is shown. It should be understood, however, that the depth of the groove 307 at the left end face may also be non-zero.
  • the second optical film 308 may be disposed only on the side wall of the recess 307, or may be disposed on the side wall and the bottom surface of the recess 307.
  • the second optical film 308 is disposed on both the side wall and the bottom surface of the recess 307, the light uniformity of the device can be better improved.
  • FIG. 8 shows a side view of a wavelength conversion device 400 in accordance with a fourth embodiment of the present invention.
  • Fig. 9 shows an end view of a wavelength conversion device 400 in accordance with a fourth embodiment of the present invention.
  • the wavelength conversion device 400 according to the fourth embodiment of the present invention is different from the wavelength conversion device 200 of the second embodiment in that the fluorescent component 402 provided in the casing 401 has a multilayer structure.
  • the fluorescent component 402 includes a first fluorescent layer 4021, a bonded reflective layer 4023, and a second fluorescent layer 4022 which are sequentially stacked.
  • the materials constituting the first fluorescent layer 4021 and the second fluorescent layer 4022 are the same as those constituting the fluorescent member in the above-described first to third embodiments.
  • the adhesive reflective layer 4023 is formed of a reflective adhesive dielectric material.
  • the adhesive reflective layer 4023 is formed by bonding together a glue, a sintered silver paste or a metal film layer mixed with high refractive particles.
  • the thickness of the adhesive reflective layer 4023 is equal to or smaller than 10 ⁇ m.
  • the lower surface and the upper surface of the adhesive reflective layer 4023 are respectively
  • the first fluorescent layer 4021 and the second fluorescent layer 4022 are bonded to each other to bond the first fluorescent layer 4021 and the second fluorescent layer 4022 together. Since the adhesive reflection layer 4023 is provided, the laser light emitted to the inside of the fluorescent layer generated in the first fluorescent layer 4021 and the second fluorescent layer 4022 is reflected by the adhesive reflection layer 4023, and then emitted from the incident side of the excitation light.
  • the wavelength conversion device 400 can be used for the case where the two-color laser light is incident, in addition to the various effects of the wavelength conversion device 100 described in the first embodiment.
  • the wavelength conversion device 400 can achieve the same effect as the wavelength conversion device 100 in the first embodiment.
  • the first fluorescent layer 4021 and the second fluorescent layer 4022 are different fluorescent ceramic layers or fluorescent glass layers capable of wavelength-converting excitation light in different wavelength ranges, lasers of different colors can be made (ie, having the first wavelength respectively)
  • the wavelength in the range and the wavelength in the second wavelength range are respectively incident from the upper and lower sides of the wavelength conversion device 400.
  • first optical films 405 and second optical films 408 may be respectively disposed on the upper and lower sides of the wavelength conversion device 400 according to the incident light of different colors, so that the first fluorescent film 4021 is disposed on the side of the first fluorescent layer 4021.
  • An optical film 405 is a first angle selection filter that is capable of transmitting only a light beam incident at an incident angle within a predetermined range in a first wavelength range, such that the first optical film 405 disposed on the second fluorescent layer 4022 side is The filter film can only be selected through a second angle of the light beam incident at an incident angle within a predetermined range in the second wavelength range, the first angle selection filter film and the second angle selection filter film having different light transmissions characteristic. For example, in FIG.
  • the first fluorescent layer 4021 may be a yellow fluorescent ceramic layer, and the light beam 410a incident from below may be a blue laser; meanwhile, the second fluorescent layer 4022 may be an orange fluorescent ceramic layer and incident from above.
  • the beam 410b can be a green laser.
  • the first optical film 405 and the second optical film 408 disposed on the lower side of the wavelength conversion device 400 are the above-described angle selection blue light transmission film, and the first optical film 405 disposed on the upper side of the wavelength conversion device 400.
  • the second optical film 408 is selected to be a green light transmissive film only through an angle of green light incident at, for example, an incident angle in the range of -8.5° to +8.5°.
  • the wavelength conversion device 500 of the present embodiment is provided as a side cross section having a trapezoidal shape as a whole.
  • the first optical films 505 of the wavelength conversion device 500 covering the U-shaped opening of the housing are not disposed in parallel but are obliquely disposed to each other such that the overall thickness of the wavelength conversion device 500 is close to the light exit end. Gradually become smaller.
  • the thickness of the fluorescent member 502 also becomes smaller as it approaches the light exit end, so that the upper surface of the fluorescent member 502 (the upper surface of the second fluorescent layer 5022) and the first optical film located on the upper side of the wavelength conversion device 500 505 is parallel, and the lower surface of the fluorescent component 502 (the lower surface of the first fluorescent layer 5021) is parallel to the first optical film 505 located on the lower side of the wavelength conversion device 500.
  • the fluorescent component 502 shown in FIG. 10 has a multi-layered structure, but the fluorescent component 502 can obviously also adopt a single-layer structure as in the first to third embodiments.
  • the light-transmitting heat-conducting member may not be provided in the wavelength conversion device 500.
  • the present invention can also provide a laser fluorescence conversion type light source.
  • the laser fluorescence conversion type light source according to the present invention includes at least a laser light source and a wavelength conversion device.
  • the wavelength conversion device can be any wavelength conversion device as described above.
  • the laser light source may be, for example, a laser light emitting array uniformly arranged as shown in FIGS. 1, 3, 6, 8, and 10.
  • the laser light-emitting array can be realized by a plurality of laser diode arrays, or by directing light from a plurality of blue laser diodes into the optical fibers, and then respectively guiding them to the respective incident light windows, or by using light shaping means to light the light from the light source. Directed to the incident light window with a specific light distribution.
  • the laser light emitted from the laser light source is incident into the wavelength conversion device toward the light incident surface of the wavelength conversion device so as to be incident through the first optical film.
  • the incident laser light is wavelength-converted and multi-reflected in the wavelength conversion device, combined to form a desired outgoing light, and then emitted from the end face of the wavelength conversion device.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Optics & Photonics (AREA)
  • General Engineering & Computer Science (AREA)
  • Semiconductor Lasers (AREA)
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Abstract

一种波长转换装置（100）和含有波长转换装置（100）的激光荧光转换型光源。波长转换装置（100）包括封装组件和荧光组件（102）。封装组件包括壳体（101），壳体（101）由两个相对设置的侧面（103）和一个封闭端面（104）形成为U形形状，壳体（101）的内表面为反射表面，壳体（101）的两个侧面（103）之间的两个相对的开口为波长转换装置（100）的光入射端，与封闭端面（104）相对的开口为波长转换装置（100）的光出射端，两个光入射端分别设置有允许特定波长和/或入射角的光束透过的第一光学膜（105）。荧光组件（102）设置在壳体（101）内部并且与封闭端面（104）连接，荧光组件（102）被形成为薄片状，荧光组件（102）的上表面和下表面分别面对光入射端的第一光学膜（105）。该波长转换装置具有高可靠性和高流明密度光输出。

Description

波长转换装置和激光荧光转换型光源 技术领域
本发明涉及波长转换装置以及使用该波长转换装置的激光荧光转换型光源。
背景技术
近年来，激光光源已经成为投影光源和照明光源的重要发展方向。目前，在众多的激光光源的产品中，主流的技术主要分为两种，一种是RGB三色激光技术，另一种是激光荧光粉技术。
三色激光技术采用红绿蓝三种颜色激光模组，其优点是可以独立进行R、G、B的三色分量的调节，其激光光能的利用率达到100％。但是，该技术方案中，投射出来的画面中容易出现“散斑”缺陷，人眼长时间观看有散斑缺陷的画面，很容易伤害眼睛，损伤视力。
而激光荧光粉技术的技术方案将蓝色激光会聚到一个高速旋转的荧光轮上，通过荧光轮上的波长转换材料如荧光粉等，将蓝色激光转换为其他颜色的光如红绿光，以获得彩色输出光。其优点是没有散斑问题，而且高速旋转的荧光轮有利于热量的散失。但是，由于该技术方案对荧光轮的依赖，限制了其在频繁振动的环境下的应用(如车载设备)，也降低了产品可靠性。
因此，亟待开发一种可靠性高(例如，能够适应振动环境)、具有高流明密度光输出能力的发光装置的技术方案。
发明内容
为了解决上述问题，本发明期望提供一种全新的波长转换装置以及采用该封装结构的激光激发荧光材料光源。
根据本发明的实施例，公开了一种波长转换装置。所述波长转换装置包括封装组件和荧光组件，所述荧光组件含有荧光材料并且能够将入射光转换成不同波长的出射光。所述封装组件包括壳体，所述壳体由两个相对设置的侧面和一个封闭端面形成为U形形状，所述壳体的内表面为反射表面，所述壳体的两个侧面之间的两个相对的开口为所述波长转 换装置的光入射端，与所述封闭端面相对的开口为所述波长转换装置的光出射端，两个光入射端分别设置有允许特定波长和/或入射角的光束透过的第一光学膜。所述荧光组件设置在所述壳体内部并且与所述封闭端面连接，所述荧光组件被形成为薄片状，所述荧光组件的上表面和下表面分别面对所述两个光入射端的第一光学膜。
优选地，所述封装组件还包括透光导热件，所述透光导热件的一个表面连接至所述荧光组件并且位于所述荧光组件与所述第一光学膜之间，所述透光导热件与所述封闭端面相连接。所述透光导热件具有朝着所述荧光组件开口的凹槽，所述凹槽沿着所述荧光组件的长度方向延伸且在垂直于该长度方向的截面上呈矩形，所述凹槽与所述荧光组件形成沿所述荧光组件的长度方向延伸的光通道。
优选地，在所述凹槽的侧壁表面或者所述凹槽的侧壁表面和底面设置有第二光学膜，所述第二光学膜至少能够反射经所述荧光组件转换后的出射光。
优选地，所述荧光组件的厚度随着靠近所述光出射端而逐渐减小，所述透光导热件的厚度和所述凹槽的深度随着靠近所述出射端而逐渐增大。
优选地，所述荧光组件具有多层结构，所述多层结构包括依次层叠的第一荧光层、粘接反射层和第二荧光层，所述粘接反射层的下表面和上表面分别粘接至所述第一荧光层和所述第二荧光层，并且能够分别反射来自所述第一荧光层和所述第二荧光层的光束。在此情况下，所述第一荧光层能够对第一波长范围内的光束进行波长转换，所述第二荧光层能够对第二波长范围内的光束进行波长转换。设置于所述波长转换装置的所述第一荧光层侧的所述第一光学膜是第一角度选择滤光膜，所述第一角度选择滤光膜仅能够透过所述第一波长范围内的以预定范围内的入射角入射的光束；设置于所述波长转换装置的所述第二荧光层侧的所述第一光学膜是第二角度选择滤光膜，所述第二角度选择滤光膜仅能够透过所述第二波长范围内的以所述预定范围内的入射角入射的光束。
优选地，所述波长转换装置的两个所述第一光学膜是相互倾斜设置的，所述波长转换装置的整体厚度随着靠近所述光出射端而逐渐变小， 并且所述荧光组件的上表面和下表面分别与面对的所述第一光学膜平行。
可替代地，所述荧光组件具有多层结构，所述多层结构包括依次层叠的第一荧光层、粘接反射层和第二荧光层，所述粘接反射层的下表面和上表面分别粘接至所述第一荧光层和所述第二荧光层，并且能够分别反射来自所述第一荧光层和所述第二荧光层的光束。所述波长转换装置的两个所述第一光学膜是相互倾斜设置的，使得所述波长转换装置的整体厚度随着靠近所述光出射端而逐渐减小，并且所述多层结构的上表面和下表面分别与面对的所述第一光学膜平行。
优选地，所述荧光组件是由复相荧光陶瓷构成的。所述复相荧光陶瓷例如可以是YAG:Ce和Al2O3的复相陶瓷。可替代地，所述荧光组件是由单晶或多晶透明荧光陶瓷或者荧光玻璃构成的，并且所述荧光组件的表面经过表面粗化处理。此外，所述壳体优选是由由金属材料制成的。此外，所述透光导热件优选是由蓝宝石制成的。
优选地，所述荧光组件的长度不大于所述壳体长度的3/4。
优选地，允许特定光束透过的所述光学膜是角度选择滤光膜，所述角度选择滤光膜仅能够透过预定波长范围内的以预定范围内的入射角入射的光束。例如，所述角度选择滤光膜是只能透过以-8.5°至+8.5°范围内的入射角入射的蓝色光束的角度选择蓝光透射膜。
根据需要，在一些实施例中，所述第一荧光层和所述第二荧光层可以是相同的荧光层。
本发明还提供了一种激光荧光转换型光源，其特征在于，所述激光荧光转换型光源包括激光装置和上述的波长转换装置，所述激光装置用作所述波长转换装置的入射光源，所述激光装置发出的激光光束能够从所述壳体的相对两侧透过所述光学膜照射至所述荧光组件的上下表面。
根据本发明，能够实现荧光组件的固定式封装，从而在发光过程中具有较好的抗振性。另外，由于荧光组件被设置在壳体内的空腔中，使荧光组件的两个表面分别面对位于壳体侧面之间的两个相对开口的第一光学膜，并将壳体的内表面设置为反射面，使得入射光能够从荧光组件的两个表面入射而发生光转换，并且此后经不断反射从封装组件的开口 的光出射端出射，从而在开口的光出射端获得高流明密度的出射光。应当理解，本发明的有益效果不限于上述效果，而可以是本文中说明的任何有益效果。
附图说明
图1是示出了根据本发明第一实施例的的波长转换装置的侧视图。
图2是示出了在图1所示的波长转换装置的光出射端的端面示意图。
图3是示出了根据本发明的第二实施例的波长转换装置的侧视图。
图4是示出了在图3所示的波长转换装置的光出射端的端面示意图。
图5是示出了根据本发明的第二实施例的变形例的波长转换装置的光出射端的端面示意图。
图6是示出了根据本发明的第三实施例的波长转换装置的侧视图。
图7的a和b是分别示出了图6中所示的波长转换装置的左侧端部和右侧光出射端的端面示意图。
图8是图示了根据本发明的第四实施例的波长转换装置的侧视图。
图9是根据本发明的第四实施例的波长转换装置的光出射端的端面示意图。
图10是图示了根据本发明的第五实施例的波长转换装置的侧视图。
具体实施方式
下面，将参照附图详细说明根据本发明的各具体实施例。需要强调的是，附图中的所有尺寸仅是示意性的并且不一定是按照真实比例图示的，因而不具有限定性。例如，应当理解，荧光组件和各种光学膜的实际厚度以及比例要比图示的尺寸小很多。
第一实施例
图1示出了根据本发明第一实施例的波长转换装置100的侧视图。图2示出了根据本发明第一实施例的波长转换装置100的光出射端的端面示意图。波长转换装置100包括：封装组件，其包括壳体101；和设置在壳体101内的荧光组件102。这里，将图1中的水平方向称为壳体101和荧光组件102的长度方向，将图1中的垂直方向称为壳体101和荧光组件102的厚度方向，将图1中的与纸面垂直的方向称为壳体101和荧 光组件102的宽度方向。壳体101包括沿长度方向延伸的两个相对侧面103(为了示出封装组件101的内部结构，图1的侧视图中未图示出封装组件101的相对侧面103，在以下各实施例的侧视图中也是如此)和连接这两个相对侧面的端部的封闭端面104。两个相对侧面103和封闭端面104一起被形成为呈U形形状。壳体101是由具有高热导率的材料形成的。例如，壳体101可以是由铝或铜等金属材料制成的，也可以是高热导率的陶瓷材料制成。此外，壳体101的内表面(即，图2中两个相对表面103的内表面和图1中封闭端面104的内表面)为反射表面，设置有全反射介质膜或镜面反射膜。具有98％以上的高反射率的镀银膜是优选的。
U形形状的壳体101的两个相对侧面之间具有两个相对的开口，并且被用作波长转换装置100接收入射光的光入射端。壳体101的与封闭端面104相对的开口被用作出射光的光出射端。位于壳体101的相对两侧的上述开口，即两个光入射端分别各设置有仅允许特定的光束透过的第一光学膜105。因而，第一光学膜105的表面成为波长转换装置100的光入射面。在本发明的一个实施方式中，第一光学膜105是角度选择滤光膜，其只能透过预定波长范围内的以预定范围的入射角入射的光束。例如，所述角度选择滤光膜可以是只能透过以-8.5°至+8.5°范围内的入射角入射的蓝光的角度选择蓝光透射膜。应当理解，上述入射角度的范围仅仅是示例，也可以是其它的角度范围。入射光透过第一光学膜105入射至封装组件内部。
荧光组件102设置在壳体101内的空腔中并且与封闭端面104连接，用于将入射的处于某波长范围内的激发光至少部分地转换成处于其它波长范围内的受激光，从而实现波长转换。荧光组件102可以由复相荧光陶瓷构成。这里，复相陶瓷是指陶瓷基复合材料，其是“复合材料”大范畴下的一个小分支。所谓“复相”主要是指材料组分中存在两种或两种以上的物质“相”，故又称“多相陶瓷”。在由这样的复相荧光陶瓷材料构成的荧光组件102的内部具有较多的散射相。这里，“散射相”是指有别于主相材料的第二相材料，其功能是对入射的激发光形成一种散射效果，从而提升激发光的吸收率，进而提升对激发光的光转换效率。因此，陶瓷主相和散射相共同组成复相陶瓷材料，并且散射相作为第二相 物质弥散在陶瓷主相中。由于存在大量的这样的散射相，所以光束在荧光组件102内部传播时会被多次散射，因此光透过率较低。复相荧光陶瓷材料可以是已知的任何合适的复相荧光陶瓷材料，例如YAG:Ce(或LuAG:Ce)和Al2O3构成的复合陶瓷，其中Al2O3为陶瓷主相，YAG:Ce作为发光中心的同时作为散射相。当然，可以理解，可以在主相材料和第二相材料的基础上增加第三相作为独立的散射相。YAG:Ce和Al2O3的复相陶瓷是优选的，其蓝光吸收率在85％～95％之间，并且1毫米厚的YAG:Ce和Al2O3的复相陶瓷的透光(可见光)率只有65％～75％。在另一个实施方式中，也可以令YAG:Ce作为陶瓷主相，而将Al2O3作为第二相，两种技术方案各有侧重。
在本发明其它实施方式中，荧光组件102也可以由单晶或多晶透明荧光陶瓷形成，例如YAG:Ce单晶或多晶陶瓷。此外，荧光组件102也可以由荧光玻璃构成。例如，荧光玻璃102可以是由荧光粉、玻璃粉和有机载体混合烧结形成的，使得荧光粉嵌入在形成连续相的玻璃中，其中，玻璃粉优选采用具有高折射率和高热稳定性的玻璃，例如硼硅酸盐无铅玻璃。当然，也可以选择已知的其它荧光玻璃。当荧光组件102由荧光玻璃或者单晶或多晶陶瓷构成时，荧光组件102的上下表面经过表面粗化处理是优选的，这样能够提高受激光的出射率。
如图1中所示，荧光组件102被形成为长方体的薄片状，其上下表面分别面对着第一光学膜105。当荧光组件102由复相荧光陶瓷构成时，厚度可以为300μm以内；当荧光组件102由单晶或多晶透明荧光陶瓷或荧光玻璃构成时，厚度较厚，在0.3～5mm范围内。荧光组件102在长度方向上的长度范围为8～15mm，在宽度方向上的宽度范围为1.5～4mm。在一个实施方式中，荧光组件102的长度等于或小于壳体101长度的3/4，以使得荧光组件102发出的光能够在从波长转换装置100的出射端出射前经历足够多次的反射而达到出射光均匀的效果。
如图1和图2所示，长方体薄片的荧光组件102的一个端面连接至壳体101的封闭端面104。另外，荧光组件102的两个侧面可以连接至壳体101的两个相对侧面103。荧光组件102与壳体101的连接方式可以是已知的低热阻的任何连接方式，例如焊接、高热导率粘接剂粘接等。荧光组件102的上下表面与第一光学膜105间隔设置，即不接触。
在根据本发明第一实施例的波长转换装置100工作时，如图1所示，从激光发光阵列120出射的激光110透过第一光学膜105照射至荧光组件102的上下表面。入射光110在荧光组件102的表面光斑处形成一个发光中心。受激光以全角度从发光中心出射，其中一个2π方位角的受激光朝着荧光组件102外部出射，进入封装组件101的内部空腔；另外一个2π方位角的受激光朝着荧光组件102的内部出射。由于荧光组件102的厚度非常薄，这部分受激光从荧光组件102的对侧表面出射，也进入壳体101的内部空腔。所有进入空腔的出射光由于角度和波长范围的变化均无法透过第一光学膜105，因而在空腔内被壳体101的高反射内表面多次反射，在经过充分的合光和匀光之后，最终从波长转换装置100的光出射端(图1中的右端)出射。
在本实施例的波长转换装置100中，荧光组件102固定连接至壳体101，因而具有能够适应振动环境的稳定性。另外，本实施例的波长转换装置100能够将来自相对两侧的入射光进行波长转换并使出射光从面积较小的一个端面出射，所以具有高流明密度光输出能力。
第二实施例
图3示出了根据本发明第二实施例的波长转换装置200的侧视图。图4示出了根据本发明第二实施例的波长转换装置200的端面图。
根据本发明第二实施例的波长转换装置200与第一实施例的波长转换装置100的区别之处在于：封装组件还包括设置在荧光组件202与第一光学膜205之间的透光导热件206。除此之外，波长转换装置200与第一实施例的波长转换装置100的构造几乎相同，因此在下面的说明中将省略重复的说明。
透光导热件206被形成为沿着荧光组件202的长度方向延伸的长方体形状。优选地，透光导热件206的长度与壳体201的长度相同。透光导热件206的面对着荧光组件202的表面与荧光组件202连接。与荧光组件202类似地，透光导热件206的一个端面连接至壳体201的封闭端面204。此外，透光导热件206的两个侧面可以连接至壳体201的两个相对侧面203。优选地，如图3和图4所示，透光导热件206也与第一光学膜205接触。透光导热件206与荧光组件202可以采用光胶或键合的方 式连接，也可以采用具有高透过率的光学胶水粘接。光胶和键合是优选的。透光导热件206具有朝着荧光组件202开口的凹槽207。凹槽207在与荧光组件202连接的表面处沿长度方向延伸，并且在垂直于该长度方向的截面上呈矩形。矩形凹槽207与所述荧光组件202一起形成了沿长度方向延伸的内部充满空气介质的光通道。在矩形凹槽207的侧壁表面，设置有第二光学膜208。第二光学膜208至少能够反射经荧光组件202转换后的出射光。例如，第二光学膜208可以是与第一光学膜205相同的光学膜。透光导热件206是由例如石英和蓝宝石等具有高透光率和高热导率的材料形成的，其中，蓝宝石是优选的。与荧光组件202和壳体201均连接的透光导热件206能够起到热沉的作用，提高荧光组件202的散热性能。
在根据本发明第二实施例的波长转换装置200工作时，从入射光源出射的入射光透过第一光学膜205以及透光导热件206照射至荧光组件202的上下表面。另外，从荧光组件202出射的受激光无法透过第一光学膜205和第二光学膜208而是被它们反射。因而，受激光只能在凹槽207的空气介质以及透光导热件206内被多次反射，在经过充分的合光和匀光之后，最终从壳体201的开口的出射端(图3中的右端)出射。
可替代地，如图5所示，凹槽207的侧壁表面和底面均设置有第二光学膜208。在此情况下，从荧光组件202出射的受激光无法透过第二光学膜208，最大程度上避免了受激光进入透光导热件206的内部。受激光只能在凹槽207的空气介质中向着出射端传播。相比于第二光学膜208仅设置在凹槽207的侧壁表面的情况，能够进一步减少光损失，提高出光效率。
第三实施例
图6示出了根据本发明第二实施例的波长转换装置300的侧视图。图7的a示出了图6中的波长转换装置300的左侧端面图，图7的b示出了图6中的波长转换装置300的左侧端面图。
根据本发明第三实施例的波长转换装置300与第二施例的波长转换装置200的区别之处在于：荧光组件302的厚度随着逐渐接近光出射端而逐渐减小，透光导热件306的厚度和凹槽307的深度(方向均与荧光 组件的厚度相同，即，图6中的垂直方向)随着逐渐接近光出射端而逐渐增大。除此之外，波长转换装置300与第二实施例的波长转换装置200的构造几乎相同，因此在下面的说明中将省略重复的说明。
在本发明中，波长转换装置出射端出射一个光斑，该出射端的光斑的光主要来自荧光组件的上下两表面与第一光学膜之间的两个光通道，由于光很少从荧光组件内部沿长度方向传播至出射端，因此导致波长转换装置的光出射端的光斑截面光分布不均匀，即对应于荧光组件的光斑中部相对于光斑上下两部分较暗。在上述的第二实施例中，波长转换装置200的荧光组件202厚度保持不变，将可能导致光出射端的光斑中部有较明显的暗线。因此，在本实施例中，通过将荧光组件302的厚度设置为随着逐渐接近出射端而逐渐减小，并且将透光导热件306的厚度和凹槽307的深度设置为随着逐渐接近出射端而逐渐增大，使得如图7的b所示，提高了凹槽307中的空气介质在波长转换装置300出射端面中所占的面积比。因此，能够改善装置的出光均匀性。图7的a和b中，示出了凹槽307的深度从左端面向着出射端从零开始逐渐增大的示例。但应当理解，凹槽307在左端面的深度也可以不为零。
此外，应当理解，与第二实施例中类似地，在本实施例中，第二光学膜308可以仅设置在凹槽307的侧壁，也可以设置在凹槽307的侧壁和底面。当凹槽307的侧壁和底面均设置有第二光学膜308时，能够更好地改善装置的出光均匀性。
第四实施例
图8示出了根据本发明第四实施例的波长转换装置400的侧视图。图9示出了根据本发明第四实施例的波长转换装置400的端面图。根据本发明第四实施例的波长转换装置400与第二施例的波长转换装置200的区别之处在于：设置于壳体401内的荧光组件402具有多层结构。具体地，荧光组件402包括依次层叠的第一荧光层4021、粘接反射层4023和第二荧光层4022。构成第一荧光层4021和第二荧光层4022的材料与上述第一至第三实施例中构成荧光组件的材料相同。粘接反射层4023是由反射粘接介质材料形成的。例如，通过将包括混有高折射粒子的胶水、烧结银浆或者金属膜层粘结在一起而形成粘接反射层4023。粘接反射层4023的厚度等于或小于10μm。粘接反射层4023的下表面和上表面分别 粘接至第一荧光层4021和第二荧光层4022，将第一荧光层4021和第二荧光层4022粘接在一起。由于设置了粘接反射层4023，在第一荧光层4021和第二荧光层4022中产生的向荧光层的内部出射的受激光被粘接反射层4023反射，然后从激发光入射侧出射。
因而，通过设置粘接反射层4023，根据本实施例的波长转换装置400除了获得第一实施例中所述的波长转换装置100的各种效果之外，还能够用于双色激光入射的情况。例如，当第一荧光层4021和第二荧光层4022是相同的荧光层时，波长转换装置400能够实现与与第一实施例中的波长转换装置100相同的效果。当第一荧光层4021和第二荧光层4022是能够对不同波长范围内的激发光进行波长转换的不同荧光陶瓷层或荧光玻璃层时，能够使不同颜色的激光(即，分别具有第一波长范围内的波长和第二波长范围内的波长)从波长转换装置400的上下两侧分别入射。在此情况下，可以根据不同颜色的入射光在波长转换装置400的上下两侧分别相应地设置不同的第一光学膜405和第二光学膜408，使得设置于第一荧光层4021侧的第一光学膜405为仅能够透过第一波长范围内的以预定范围内的入射角入射的光束的第一角度选择滤光膜，使得设置于第二荧光层4022侧的第一光学膜405为仅能够透过第二波长范围内的以预定范围内的入射角入射的光束的第二角度选择滤光膜，第一角度选择滤光膜和第二角度选择滤光膜具有不同的光透过特性。例如，在图8中，第一荧光层4021可以是黄色荧光陶瓷层，且从下方入射的光束410a可以是蓝色激光；同时，第二荧光层4022可以是橙色荧光陶瓷层，且从上方入射的光束410b可以是绿色激光。在此情况下，设置于波长转换装置400的下侧的第一光学膜405和第二光学膜408是上述角度选择蓝光透射膜，而设置于波长转换装置400的上侧的第一光学膜405和第二光学膜408是只能透过例如以-8.5°至+8.5°范围内的入射角入射的绿光的角度选择绿光透射膜。
应当理解，本实施例中所述的具有多层结构的荧光组件显然也可以应用于第一实施例和第三实施例。
第五实施例
为了进一步提高受激光的收集效率和出射光的流明密度，本实施例的波长转换装置500被设置为整体上具有梯形形状的侧截面。换言之， 如图10所示，波长转换装置500的覆盖壳体的U形开口的第一光学膜505不是平行设置的而是相互倾斜设置的，使得波长转换装置500的整体厚度随着靠近光出射端而逐渐变小。此外，荧光组件502的厚度也随着靠近光出射端而逐渐变小，使得荧光组件502的上表面(第二荧光层5022的上表面)与位于波长转换装置500的上侧的第一光学膜505平行，荧光组件502的下表面(第一荧光层5021的下表面)与位于波长转换装置500的下侧的第一光学膜505平行。
应当理解，在图10中示出的荧光组件502具有多层结构，但荧光组件502显然也可以采用如第一实施例至第三实施例中的单层结构。另外，与第一实施例中类似地，波长转换装置500中也可以不设置有透光导热件。
本发明还能够提供一种激光荧光转换型光源。根据本发明的激光荧光转换型光源至少包括激光光源和波长转换装置。波长转换装置可以是如上所述的任意波长转换装置。激光光源例如可以是如图1、3、6、8和10中所示地均匀排布的激光发光阵列。激光发光阵列可以通过多个激光二极管阵列密排实现，也可以通过将多颗蓝光激光二极管发出的光导入光纤，然后分别引导至各个入射光窗口，还可以是通过光整形装置将来自光源的光以特定的光分布引导至入射光窗口。从激光光源发出的激光朝着波长转换装置的光入射表面以能够透过上述第一光学膜的入射角入射至波长转换装置内。入射的激光在波长转换装置内经过波长转换和多次反射，合光成期望的出射光，然后从波长转换装置的端面出射。
尽管在上面已经参照附图说明了根据本发明的波长转换装置和激光荧光转换型光源，但是本发明不限于此，且本领域技术人员应理解，在不偏离本发明随附权利要求书限定的实质或范围的情况下，可以做出各种改变、组合、次组合以及变型。

Claims (17)

  1. 一种波长转换装置，所述波长转换装置包括封装组件和荧光组件，所述荧光组件含有荧光材料并且能够将入射光转换成不同波长的出射光，其特征在于，
    所述封装组件包括壳体，所述壳体由两个相对设置的侧面和一个封闭端面形成为U形形状，所述壳体的内表面为反射表面，所述壳体的两个侧面之间的两个相对的开口为所述波长转换装置的光入射端，与所述封闭端面相对的开口为所述波长转换装置的光出射端，两个所述光入射端分别设置有允许特定波长和/或入射角的光束透过的第一光学膜；
    所述荧光组件设置在所述壳体内部并且与所述封闭端面连接，所述荧光组件被形成为薄片状，所述荧光组件的上表面和下表面分别面对所述光入射端的所述第一光学膜。
  2. 根据权利要求1所述的波长转换装置，其特征在于，所述封装组件还包括透光导热件，所述透光导热件的一个表面连接至所述荧光组件并且位于所述荧光组件与所述第一光学膜之间，所述透光导热件与所述封闭端面相连接，
    所述透光导热件具有朝着所述荧光组件开口的凹槽，所述凹槽沿着所述荧光组件的长度方向延伸且在垂直于该长度方向的截面上呈矩形，所述凹槽与所述荧光组件形成沿所述荧光组件的长度方向延伸的光通道。
  3. 根据权利要求2所述的波长转换装置，其特征在于，所述凹槽的侧壁表面或者所述凹槽的侧壁表面和底面设置有第二光学膜，所述第二光学膜至少能够反射经所述荧光组件转换后的出射光。
  4. 根据权利要求2所述的波长转换装置，其特征在于，所述荧光组件的厚度随着靠近所述光出射端而逐渐减小，所述透光导热件的厚度和所述凹槽的深度随着靠近所述出射端而逐渐增大。
  5. 根据权利要求1至4中任一项所述的波长转换装置，其特征在于，所述荧光组件具有多层结构，所述多层结构包括依次层叠的第一荧光层、粘接反射层和第二荧光层，所述粘接反射层的下表面和上表面分别粘接至所述第一荧光层和所述第二荧光层，并且能够分别反射来自所述第一荧光层和所述第二荧光层的光束。
  6. 根据权利要求5所述的波长转换装置，其特征在于，所述第一荧光层和所述第二荧光层是相同的荧光层。
  7. 根据权利要求5所述的波长转换装置，其特征在于，所述第一荧光层能够对第一波长范围内的光束进行波长转换，所述第二荧光层能够对第二波长范围内的光束进行波长转换，并且
    设置于所述波长转换装置的所述第一荧光层侧的所述第一光学膜是第一角度选择滤光膜，所述第一角度选择滤光膜仅能够透过所述第一波长范围内的以预定范围内的入射角入射的光束；设置于所述波长转换装置的所述第二荧光层侧的所述第一光学膜是第二角度选择滤光膜，所述第二角度选择滤光膜仅能够透过所述第二波长范围内的以所述预定范围内的入射角入射的光束。
  8. 根据权利要求1至3中任一项所述的波长转换装置，其特征在于，所述波长转换装置的两个所述第一光学膜是相互倾斜设置的，所述波长转换装置的整体厚度随着靠近所述光出射端而逐渐变小，并且所述荧光组件的上表面和下表面分别与面对的所述第一光学膜平行。
  9. 根据权利要求1至3中任一项所述的波长转换装置，其特征在于，所述荧光组件具有多层结构，所述多层结构包括依次层叠的第一荧光层、粘接反射层和第二荧光层，所述粘接反射层的下表面和上表面分别粘接至所述第一荧光层和所述第二荧光层，并且能够分别反射来自所述第一荧光层和所述第二荧光层的光束；并且
    所述波长转换装置的两个所述第一光学膜是相互倾斜设置的，所述 波长转换装置的整体厚度随着靠近所述光出射端而逐渐减小，并且所述多层结构的上表面和下表面分别与面对的所述第一光学膜平行。
  10. 根据权利要求1至4中任一项所述的波长转换装置，其特征在于，所述荧光组件是由复相荧光陶瓷构成的。
  11. 根据权利要求8所述的波长转换装置，其特征在于，所述复相荧光陶瓷为YAG:Ce和Al2O3的复相陶瓷。
  12. 根据权利要求1至4中任一项所述的波长转换装置，其特征在于，所述荧光组件是由单晶或多晶透明荧光陶瓷或者荧光玻璃构成的，并且所述荧光组件的表面经过表面粗化处理。
  13. 根据权利要求1至4中任一项所述的波长转换装置，其特征在于，所述荧光组件的长度不大于所述壳体长度的3/4。
  14. 根据权利要求1至4中任一项所述的波长转换装置，其特征在于，所述壳体是由金属材料制成的。
  15. 根据权利要求1至4中任一项所述的波长转换装置，其特征在于，所述第一光学膜是只能透过以-8.5°至+8.5°范围内的入射角入射的蓝色光束的角度选择蓝光透射膜。
  16. 根据权利要求2至4中任一项所述的波长转换装置，其特征在于，所述透光导热件是由蓝宝石制成的。
  17. 一种激光荧光转换型光源，其特征在于，所述激光荧光转换型光源包括激光装置和如权利要求1至16中任一项所述的波长转换装置，所述激光装置用作所述波长转换装置的入射光源，所述激光装置发出的激光光束能够透过所述第一光学膜照射至所述荧光组件的上下表面。
PCT/CN2017/114707 2017-07-05 2017-12-06 波长转换装置和激光荧光转换型光源 Ceased WO2019006979A1 (zh)

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