CN117986018A - Photonic crystal light enhanced fluorescent ceramic for laser illumination and preparation method thereof - Google Patents
Photonic crystal light enhanced fluorescent ceramic for laser illumination and preparation method thereof Download PDFInfo
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- CN117986018A CN117986018A CN202211369436.9A CN202211369436A CN117986018A CN 117986018 A CN117986018 A CN 117986018A CN 202211369436 A CN202211369436 A CN 202211369436A CN 117986018 A CN117986018 A CN 117986018A
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- 239000000919 ceramic Substances 0.000 title claims abstract description 74
- 239000004038 photonic crystal Substances 0.000 title claims abstract description 40
- 238000005286 illumination Methods 0.000 title claims abstract description 39
- 238000002360 preparation method Methods 0.000 title abstract description 7
- 239000011159 matrix material Substances 0.000 claims abstract description 27
- 239000002131 composite material Substances 0.000 claims abstract description 18
- 239000002344 surface layer Substances 0.000 claims abstract description 10
- 239000010410 layer Substances 0.000 claims abstract description 3
- 239000000843 powder Substances 0.000 claims description 29
- 239000004005 microsphere Substances 0.000 claims description 22
- 238000000034 method Methods 0.000 claims description 13
- 239000002002 slurry Substances 0.000 claims description 13
- 239000004793 Polystyrene Substances 0.000 claims description 12
- 235000015895 biscuits Nutrition 0.000 claims description 12
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 claims description 10
- 230000000737 periodic effect Effects 0.000 claims description 8
- 229920002223 polystyrene Polymers 0.000 claims description 8
- 239000011248 coating agent Substances 0.000 claims description 7
- 238000000576 coating method Methods 0.000 claims description 7
- 238000001035 drying Methods 0.000 claims description 7
- 238000004528 spin coating Methods 0.000 claims description 7
- 229910010413 TiO 2 Inorganic materials 0.000 claims description 6
- 238000007873 sieving Methods 0.000 claims description 6
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 claims description 5
- 238000009694 cold isostatic pressing Methods 0.000 claims description 5
- 239000002270 dispersing agent Substances 0.000 claims description 5
- 238000010438 heat treatment Methods 0.000 claims description 5
- 238000001027 hydrothermal synthesis Methods 0.000 claims description 5
- 239000000203 mixture Substances 0.000 claims description 5
- 238000003825 pressing Methods 0.000 claims description 5
- 238000001338 self-assembly Methods 0.000 claims description 5
- 238000003756 stirring Methods 0.000 claims description 5
- 229910004298 SiO 2 Inorganic materials 0.000 claims description 4
- 239000006185 dispersion Substances 0.000 claims description 4
- 239000000126 substance Substances 0.000 claims description 4
- 239000008367 deionised water Substances 0.000 claims description 2
- 229910021641 deionized water Inorganic materials 0.000 claims description 2
- 238000007865 diluting Methods 0.000 claims description 2
- 239000011858 nanopowder Substances 0.000 claims description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 2
- 229920003229 poly(methyl methacrylate) Polymers 0.000 claims 2
- 239000004926 polymethyl methacrylate Substances 0.000 claims 2
- 238000004519 manufacturing process Methods 0.000 claims 1
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 238000002156 mixing Methods 0.000 description 9
- 229910002651 NO3 Inorganic materials 0.000 description 6
- NHNBFGGVMKEFGY-UHFFFAOYSA-N Nitrate Chemical compound [O-][N+]([O-])=O NHNBFGGVMKEFGY-UHFFFAOYSA-N 0.000 description 6
- 239000002245 particle Substances 0.000 description 4
- 239000012700 ceramic precursor Substances 0.000 description 3
- CETPSERCERDGAM-UHFFFAOYSA-N ceric oxide Chemical compound O=[Ce]=O CETPSERCERDGAM-UHFFFAOYSA-N 0.000 description 3
- 229910000422 cerium(IV) oxide Inorganic materials 0.000 description 3
- 239000013078 crystal Substances 0.000 description 3
- 230000005284 excitation Effects 0.000 description 3
- 238000001513 hot isostatic pressing Methods 0.000 description 3
- 230000003287 optical effect Effects 0.000 description 3
- 238000005498 polishing Methods 0.000 description 3
- 239000002243 precursor Substances 0.000 description 3
- 238000004321 preservation Methods 0.000 description 3
- 239000002994 raw material Substances 0.000 description 3
- 238000005245 sintering Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
- 238000000605 extraction Methods 0.000 description 2
- 238000003754 machining Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 238000012216 screening Methods 0.000 description 2
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000003475 lamination Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- 238000012795 verification Methods 0.000 description 1
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Abstract
The invention discloses a photonic crystal light enhanced fluorescent ceramic for laser illumination and a preparation method thereof. The fluorescent ceramic includes: the fluorescent ceramic composite matrix comprises a fluorescent ceramic composite matrix and a photonic crystal surface layer, wherein the photonic crystal surface layer covers the light-emitting surface of the fluorescent ceramic composite matrix to realize the adjustment of the directivity of the emergent light beam of the fluorescent ceramic composite matrix layer. The invention has the beneficial effects that: the light intensity and the central brightness of the laser illumination product are obviously improved, and the application field of high-brightness white light laser illumination can be satisfied.
Description
Technical Field
The invention relates to fluorescent ceramics, in particular to fluorescent ceramics for laser illumination enhanced by photonic crystal light and a preparation method thereof.
Background
The main stream technique of laser illumination is to use a semiconductor laser as a core light source, adopt laser excited fluorophor to convert into light with other wavelengths, and mix the light to form high-brightness white light illumination, and has the technical advantages of good directivity, strong monochromaticity and the like. Aiming at the high-brightness illumination requirements in special fields, such as laser search lamps for helicopters, laser search lamps for ships and the like, the input power and the number of optical elements are increased on the basis of laser illumination in the industry so as to obtain higher central light intensity and brightness. However, with the development demands of miniaturized and light-weight armed equipment, the increase of working power and optical elements not only leads to the increase of the volume and weight of laser illumination products and the increase of cost, but also easily causes the increase of the convergence difficulty of emergent light so that part of emergent light cannot be reasonably utilized, and the overall efficiency is reduced.
When laser light is incident into the fluorescent ceramic, the luminescent center in the ceramic is converted to generate yellow light. Since the fluorescent ceramic has a high refractive index, when the exit angle of the exiting light is greater than the critical angle θ, the light is totally reflected inside the ceramic, thereby causing the expansion of the spot of the exiting light and the reduction of the light extraction efficiency, resulting in lower central light intensity.
The photon crystal is used as a new type optical material, which arranges the medium with different refractive index according to the period, uses the refraction and reflection principle to make the light spread in it and be emitted from the inside smoothly, thus solving the light emitting problem. Therefore, the photonic crystal is compounded on the surface of the fluorescent ceramic for laser illumination, the directivity of the emergent light of the fluorescent ceramic matrix is regulated and controlled by utilizing the band gap structure and the periodic refractive index change of the photonic crystal, the light extraction efficiency of the fluorescent ceramic is enhanced, the light spot expansion of the emergent light is reduced, and the technology for obtaining the fluorescent body with high luminous brightness has great application potential. At present, research on a phosphor for photon crystal light enhancement laser illumination is not discussed in detail, a key technology is not mature, and a large amount of experimental verification research work is required to be carried out so as to meet the large-scale application of the laser illumination field.
Disclosure of Invention
The invention aims to solve the problems in the prior art and provides novel photonic crystal light-enhanced fluorescent ceramic for laser illumination and a preparation method thereof.
In order to achieve the purpose, the technical scheme of the invention is as follows: a photonic crystal light-enhanced fluorescent ceramic for laser illumination comprising: the fluorescent ceramic composite matrix comprises a fluorescent ceramic composite matrix and a photonic crystal surface layer, wherein the photonic crystal surface layer covers the light-emitting surface of the fluorescent ceramic composite matrix to realize the adjustment of the directivity of the emergent light beam of the fluorescent ceramic composite matrix layer.
As a preferable scheme of the fluorescent ceramic for laser illumination with photon crystal light enhancement, the fluorescent ceramic complex phase matrix is a complex phase structure composed of a YAG phase and an Al 2O3 phase; further, the weight percentage of the YAG phase is more than or equal to 40wt percent, and the weight percentage of the Al 2O3 phase is less than or equal to 60wt percent.
As a preferable scheme of the photonic crystal light enhanced fluorescent ceramic for laser illumination, the chemical composition of the YAG phase is (Ce xReyY1-x-y)3Al5O12, wherein Re is one or more of Lu, tb, gd, ga, and the values of x and y are in the range of 0.005-0.05 and 0-0.25.
As a preferable scheme of the fluorescent ceramic for laser illumination with the light enhancement of the photonic crystal, the surface layer of the photonic crystal is formed by arranging monodisperse microspheres in a periodic structure, and the materials of the microspheres are one or more of Polystyrene (PS) and SiO 2、TiO2; further, the diameter of the microsphere ranges from 40nm to 100nm.
The invention also provides a preparation method of the photonic crystal light enhanced fluorescent ceramic for laser illumination, which is used for preparing the fluorescent body for laser illumination and comprises the following steps:
step S1, preparing a fluorescent ceramic complex phase matrix; and
Step S2, preparing a photonic crystal surface layer to obtain the phosphor for laser illumination: providing a solution with monodisperse microspheres, and coating the solution on the light-emitting surface of the fluorescent ceramic complex-phase matrix by adopting a spin-coating self-assembly method to form photonic crystals with periodic structural arrangement.
As a preferred embodiment of the method for preparing a photonic crystal light-enhanced fluorescent ceramic for laser illumination, step S1 includes:
Step S11, preparing YAG phase powder and Al 2O3 phase powder;
Step S12, preparing a ceramic biscuit: stirring and dispersing powder of a YAG phase, powder of an Al 2O3 phase and a dispersing agent to obtain uniform aqueous slurry, wherein the weight percentage of the powder of the YAG phase is more than or equal to 40wt% and the weight percentage of the powder of the Al 2O3 phase is less than or equal to 60wt%, drying the aqueous slurry, sieving, dry-pressing to obtain a block, and performing cold isostatic pressing on the block to obtain a ceramic biscuit; and
And S13, finishing the ceramic biscuit to obtain the fluorescent ceramic complex phase matrix.
As a preferable scheme of the preparation method of the photonic crystal light enhanced fluorescent ceramic for laser illumination, in the step S11, the powder of YAG phase is prepared by adopting a hydrothermal method according to the chemical composition (Ce xReyY1-x-y)3Al5O12 metering ratio), wherein Re is one or more of Lu, tb, gd, ga, and the range of x and y is that x is more than or equal to 0.005 and less than or equal to 0.05, and y is more than or equal to 0 and less than or equal to 0.25.
As a preferred embodiment of the method for preparing a photonic crystal light-enhanced fluorescent ceramic for laser illumination, step S2 includes:
Step S21, preparing a solution with monodisperse microspheres: diluting one or more of Polystyrene (PS), siO 2、TiO2 nano powder or hydrosol with deionized water solution respectively to obtain a dispersion solution containing PS, siO 2 or TiO 2 nano microspheres;
Step S22, preparing a photonic crystal: and (3) respectively coating one or more of the dispersion solutions containing the PS and SiO 2、TiO2 nano-microspheres on the light-emitting surface of the cleaned fluorescent ceramic by adopting a spin coating method, and then carrying out heat treatment to obtain the fluorescent ceramic with the surface photonic crystal.
Compared with the prior art, the invention has the beneficial effects that: the light intensity and the central brightness of the laser illumination product are obviously improved, and the application field of high-brightness white light laser illumination can be satisfied.
Drawings
Fig. 1 is a schematic structural diagram of an embodiment of the present invention.
Fig. 2 is an enlarged schematic view of the a position of fig. 1.
Detailed Description
The invention will be described in further detail below with reference to the drawings by means of specific embodiments. The description of these embodiments is provided to assist understanding of the present invention, but is not to be construed as limiting the present invention. In addition, the technical features of the embodiments of the present invention described below may be combined with each other as long as they do not collide with each other.
Example 1:
Mixing Y 2O3、Tb7O4、CeO2 and Al (NO 3)3•9H2 O) as raw materials to prepare nitrate solution, mixing the corresponding nitrate solution according to the stoichiometric ratio of Ce 0.01Tb0.20Y0.79)3Al5O12, adopting a hydrothermal method to synthesize YAG phase fluorescent powder with the particle size of 50-200nm through heat preservation for 10 hours at 120 ℃, mixing the fluorescent powder, the Al 2O3 powder and a certain amount of dispersing agent, stirring and dispersing to obtain uniform aqueous slurry, then placing the aqueous slurry into an oven for drying at 65 ℃, placing the dried block into an automatic sieving machine for sieving after the slurry is dried to obtain uniformly dispersed powder, drying and pressing the sieved powder to obtain a preformed block, carrying out cold isostatic pressing on the preformed block to obtain a ceramic biscuit, carrying out hot isostatic pressing sintering on the ceramic biscuit to obtain the fluorescent ceramic composite precursor, carrying out precise machining on the ceramic precursor, wherein the thickness of the sample is 0.1-1 mm, the radius is less than or equal to 10mm, and carrying out double-sided polishing to obtain the fluorescent ceramic composite matrix.
And (3) coating a solution with monodisperse polystyrene microspheres and 50nm of microsphere diameter on the upper surface of a fluorescent ceramic matrix by adopting a spin coating self-assembly method to form a polystyrene microsphere film with periodic structure arrangement, and obtaining the photonic crystal light-enhanced fluorescent body after heat treatment. The blue laser is used as a blue excitation light source, the blue light excites the fluorescent body to realize high-brightness white light emission, the central light intensity can reach 620 ten thousand cd, and the high-brightness white light laser illumination application is satisfied.
Example 2:
Mixing Y 2O3、Tb7O4、CeO2 and Al (NO 3)3•9H2 O) as raw materials to prepare nitrate solution, mixing the corresponding nitrate solution according to the stoichiometric ratio of Ce 0.01Tb0.20Y0.79)3Al5O12, adopting a hydrothermal method to synthesize YAG phase fluorescent powder with the particle size of 50-200nm through heat preservation for 10 hours at 120 ℃, mixing the fluorescent powder, the Al 2O3 powder and a certain amount of dispersing agent, stirring and dispersing to obtain uniform aqueous slurry, then placing the aqueous slurry into an oven for drying at 65 ℃, placing the dried block into an automatic sieving machine for sieving after the slurry is dried to obtain uniformly dispersed powder, drying and pressing the sieved powder to obtain a preformed block, carrying out cold isostatic pressing on the preformed block to obtain a ceramic biscuit, carrying out hot isostatic pressing sintering on the ceramic biscuit to obtain the fluorescent ceramic composite precursor, carrying out precise machining on the ceramic precursor, wherein the thickness of the sample is 0.1-1 mm, the radius is less than or equal to 10mm, and carrying out double-sided polishing to obtain the fluorescent ceramic composite matrix.
And (3) coating a solution with monodisperse TiO 2 microspheres and a particle diameter of 50nm on the upper surface of a fluorescent ceramic matrix by adopting a spin coating self-assembly method to form a TiO 2 microsphere film with periodic structure arrangement, and obtaining the photonic crystal light-enhanced fluorescent body after heat treatment. The blue laser is used as a blue excitation light source, the blue light excites the fluorescent body to realize high-brightness white light emission, the central light intensity can reach 700 ten thousand cd, and the high-brightness white light laser illumination application is satisfied.
Example 3:
Mixing Y 2O3、Tb7O4、CeO2 and Al (NO 3)3•9H2 O) as raw materials to prepare nitrate solution, mixing the corresponding nitrate solution according to the stoichiometric ratio of Ce 0.01Tb0.20Y0.79)3Al5O12, adopting a hydrothermal method to synthesize fluorescent powder with the particle size ranging from 50nm to 200nm through heat preservation for 10 hours at 120 ℃, mixing the fluorescent powder, the Al 2O3 powder and a certain amount of dispersing agent, stirring and dispersing to obtain uniform aqueous slurry, then placing the aqueous slurry into an oven for drying at 65 ℃, placing the dried block into an automatic screening machine for screening after the slurry is dried to obtain uniformly dispersed powder, carrying out dry pressing on the powder to obtain a preformed block, carrying out cold isostatic pressing on the preformed block to obtain a ceramic biscuit, carrying out hot isostatic pressing sintering on the ceramic biscuit to obtain the fluorescent ceramic composite precursor, carrying out precise processing on the ceramic precursor, wherein the thickness of the sample is 0.1-1 mm, the radius is less than or equal to 10mm, and carrying out double-sided polishing to obtain the fluorescent ceramic composite matrix.
And (3) coating a TiO 2 microsphere solution with a monodispersed diameter of 30nm and a polystyrene microsphere solution with a diameter of 50nm on the upper surface of a fluorescent ceramic matrix in a lamination manner by adopting a spin coating self-assembly method to form a PS/TiO 2 laminated film with a periodic structure arrangement, and obtaining the photonic crystal light-enhanced phosphor with the microspheres with the laminated structure after heat treatment. The blue laser is used as a blue excitation light source, the blue light excites the fluorescent body to realize high-brightness white light emission, the central light intensity can reach 780 ten thousand cd, and the high-brightness white light laser illumination application is satisfied.
While only embodiments of the invention have been shown and described in detail, it is not intended that the scope of the invention be limited thereby. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the invention, which are all within the scope of the invention. Accordingly, the scope of protection of the present invention is to be determined by the appended claims.
Claims (8)
1. A photonic crystal light-enhanced fluorescent ceramic for laser illumination, comprising: the fluorescent ceramic composite matrix comprises a fluorescent ceramic composite matrix and a photonic crystal surface layer, wherein the photonic crystal surface layer covers the light-emitting surface of the fluorescent ceramic composite matrix to realize the adjustment of the directivity of the emergent light beam of the fluorescent ceramic composite matrix layer.
2. The photonic crystal light-enhanced fluorescent ceramic for laser illumination of claim 1, wherein the fluorescent ceramic complex phase matrix is a complex phase structure composed of YAG phase and Al 2O3 phase; further, the weight percentage of the YAG phase is more than or equal to 40wt percent, and the weight percentage of the Al 2O3 phase is less than or equal to 60wt percent.
3. The photonic crystal light-enhanced fluorescent ceramic for laser illumination of claim 2, wherein the chemical composition of the YAG phase is (Ce xReyY1-x-y)3Al5O12, wherein Re is one or more of Lu, tb, gd, ga, and the values of x and y are in the range of 0.005-0.05 and 0-0.25.
4. The photonic crystal light-enhanced fluorescent ceramic for laser illumination according to claim 1, wherein the photonic crystal surface layer is formed by arranging monodisperse microspheres in a periodic structure, and the microspheres are made of one or more of Polystyrene (PS), polymethyl methacrylate (PMMA) and SiO 2、TiO2; further, the diameter of the microsphere ranges from 40nm to 100nm.
5. A method for producing a photonic crystal light-enhanced fluorescent ceramic for laser illumination, which is used for producing the phosphor for laser illumination according to any one of claims 1 to 4, characterized by comprising:
step S1, preparing a fluorescent ceramic complex phase matrix; and
Step S2, preparing a photonic crystal surface layer to obtain the phosphor for laser illumination: providing a solution with monodisperse microspheres, and coating the solution on the light-emitting surface of the fluorescent ceramic complex-phase matrix by adopting a spin-coating self-assembly method to form photonic crystals with periodic structural arrangement.
6. The method for preparing a photonic crystal light-enhanced fluorescent ceramic for laser illumination of claim 5, wherein step S1 comprises:
Step S11, preparing YAG phase powder and Al 2O3 phase powder;
Step S12, preparing a ceramic biscuit: stirring and dispersing powder of a YAG phase, powder of an Al 2O3 phase and a dispersing agent to obtain uniform aqueous slurry, wherein the weight percentage of the powder of the YAG phase is more than or equal to 40wt% and the weight percentage of the powder of the Al 2O3 phase is less than or equal to 60wt%, drying the aqueous slurry, sieving, dry-pressing to obtain a block, and performing cold isostatic pressing on the block to obtain a ceramic biscuit; and
And S13, finishing the ceramic biscuit to obtain the fluorescent ceramic complex phase matrix.
7. The method of claim 6, wherein in step S11, the YAG phase powder is prepared by a hydrothermal method according to a chemical composition (Ce xReyY1-x-y)3Al5O12 metering ratio), wherein Re is one or more of Lu, tb, gd, ga, x and y are in a value range of 0.005-0.05 and 0-0.25.
8. The method for preparing a photonic crystal light-enhanced fluorescent ceramic for laser illumination according to claim 5, wherein step S2 comprises:
Step S21, preparing a solution with monodisperse microspheres: diluting one or more of Polystyrene (PS), siO2, tiO 2 nano powder or hydrosol with deionized water solution respectively to obtain a dispersion solution containing PS, siO 2 or TiO 2 nano microspheres;
Step S22, preparing a photonic crystal: and (3) respectively coating one or more of the dispersion solutions containing the PS and SiO 2、TiO2 nano-microspheres on the light-emitting surface of the cleaned fluorescent ceramic by adopting a spin coating method, and then carrying out heat treatment to obtain the fluorescent ceramic with the surface photonic crystal.
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| CN202211369436.9A CN117986018A (en) | 2022-11-03 | 2022-11-03 | Photonic crystal light enhanced fluorescent ceramic for laser illumination and preparation method thereof |
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| CN202211369436.9A CN117986018A (en) | 2022-11-03 | 2022-11-03 | Photonic crystal light enhanced fluorescent ceramic for laser illumination and preparation method thereof |
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