A wood-based laser scatterer and a preparation method and application thereof

Abstract

The present application relates to a kind of wood-based laser scatterer and its preparation method and application, belong to optical material and wood science and technology field.The wood-based laser scatterer is made of delignified wood or delignified wood chromophore group wood and the transparent resin of refractive index mismatching with wood nanocellulose refractive index immersed in wood internal pore structure;It is made by ultraviolet curing or thermal curing;Or, delignified wood or delignified wood chromophore group wood and the transparent resin of refractive index mismatching with wood nanocellulose refractive index immersed in wood internal pore structure and fluorescent material are made, then it is made by light curing or thermal curing.The preparation method and application of the wood-based laser scatterer are disclosed.The laser scatterer material of the present application, preparation process is simple, reaction condition is mild, with good mechanical properties and water resistance, can be applied in seabed lighting, underwater lighting, indoor lighting, outdoor lighting, long-distance non-contact lighting, controllable light color lighting and other fields.

Description

Technical Field

[0001] This invention relates to a wood-based laser scatterer, its preparation method, and its application, belonging to the fields of optical materials and wood science and technology. Background Technology

[0002] Light-emitting diodes (LEDs) and laser diodes (LDs) solid-state lighting devices feature high power density, high brightness, small size, and low energy consumption. Currently, LEDs are the most efficient lighting devices, but they suffer from low light conversion efficiency. Even at high current densities, they still exhibit low quantum conversion efficiency, severely limiting their application in high-brightness fields such as automotive headlights, projection displays, and floodlight projectors.

[0003] To address this issue, LDs are considered an alternative to LEDs in solid-state lighting because they do not suffer from low luminous efficiency. LD lighting boasts high photoelectric conversion efficiency, and higher brightness can be achieved simply by increasing the input current density. Furthermore, LDs offer advantages such as good directivity, high brightness, long illumination distance, and long lifespan, making them suitable for high-brightness applications in automotive, urban landscapes, smart lighting, laser flashlights, and visible light communication. Therefore, LDs are seen as the next generation of high-brightness solid-state light sources. However, the highly concentrated beam of LDs and their ability to emit only monochromatic light both hinder their ability to provide the 3D uniform light required in lighting applications. To solve this problem, currently, multi-color light effects are mainly achieved by irradiating a phosphor-containing light converter with ultraviolet or blue LDs. The light converter contains numerous scattering centers that scatter the focused laser beam, resulting in a highly scattered light source for lighting. However, the brightness of such devices is strongly limited by the Stokes shift and internal quantum efficiency of the phosphor light converter.

[0004] With the development of the field of optical illumination, more and more people are proposing to use high-scattering bodies to scatter focused laser beams to obtain 3D uniform illumination sources. Patent CN113831837A proposes a laser scatterer with controllable particle size, its preparation method, and its application. This material uses an organosilane solution as a precursor, and then forms a hydrogel through an acid or base catalyst reaction. The scatterer needs to be dried with supercritical carbon dioxide to obtain a material with a three-dimensional porous structure. This material is very beneficial for laser illumination and has a significant driving force for achieving high-power laser illumination. However, this preparation method is complex and costly, and the silicon-based materials used are non-degradable, easily generating a large amount of white pollution after the product is used up. In 2020, researchers used interconnected hollow hexagonal boron nitride (BN) microtubes with nanoscale wall thickness to form a scatterer, which performs Dalang scattering of laser light irradiated onto it, achieving isotropic light distribution and providing an illumination effect. However, BN microtubes need to be manufactured in a high-temperature quartz tube furnace; these manufacturing processes consume a large amount of energy.

[0005] Wood is a natural, biodegradable, and renewable material that has been used in construction and furniture since ancient times. In recent years, with the development of nanotechnology, a large number of functional wood-based composite materials have been prepared by adjusting the porous structure and unique chemical composition of wood. These include transparent wood, high-strength dense wood, and photonic wood. Transparent wood is a novel type of wood-based composite material, produced by removing lignin or modifying lignin chromophores, then impregnating a polymer with a refractive index matching that of cellulose into a lignocellulose skeleton, followed by curing. However, due to the strong light scattering within transparent wood, it exhibits high haze. Current research mainly focuses on reducing haze (minimizing scattering) to improve its transparency. Few researchers have considered how to fully utilize this high haze characteristic to manufacture functional wood-based materials. The higher the haze of a transparent material, the stronger its light scattering effect. This means that when a focused beam of light illuminates a high-haze material, the beam will be scattered into three-dimensional space, thus achieving an illumination effect. Therefore, it can be inferred that if the haze of transparent wood is further increased, its scattering performance will become more significant, effectively scattering the focused beam of light into the surrounding space to achieve illumination.

[0006] Patent CN113664938A proposes methods such as removing lignin or modifying the structure of lignin chromophores to prepare large-format transparent wood. This patent discloses that after removing lignin or lignin chromophores, a resin with a refractive index matching that of cellulose is added to the wood skeleton to increase light transmittance and make the wood transparent. This method is used to prepare transparent wood, but the resulting product cannot be used with scattering lasers.

[0007] To address the aforementioned problems, this invention proposes using natural wood to prepare green, environmentally friendly, biodegradable, and low-carbon-emission scattering materials. Summary of the Invention

[0008] Therefore, based on the various problems in the prior art, the main objective of this invention is to provide wood-based laser scatterer lighting materials and their preparation methods, as well as the applications of wood-based laser scatterers in the field of laser lighting materials. This invention overcomes the shortcomings of the prior art by utilizing the advantages of wood, such as its natural biodegradability, environmental friendliness, low cost, and simple manufacturing process.

[0009] To achieve the above-mentioned objectives, the present invention adopts the following technical solution:

[0010] A wood-based laser scatterer is composed of lignin-free wood or lignin-free chromophore wood and a transparent resin whose refractive index is mismatched with that of wood nanocellulose, which is embedded in the internal pore structure of the wood; it is manufactured by UV curing or thermosetting.

[0011] The refractive index of the transparent resin that does not match the refractive index of wood nanocellulose is <1.53 or >1.53. The resin refers to one or more of the following: polyethylene glycol diacrylate, epoxy acrylate, acrylate derivatives, polyurethane prepolymer, polyurethane-modified epoxy resin, polyvinylpyrrolidone, polyethylene glycol, polydimethylsiloxane, tetramethyl orthosilicate, tetraethyl orthosilicate, methyltrimethoxysilane, methyltriethoxysilane, dimethyldimethoxysilane, dimethyldiethoxysilane, and silicone rubber.

[0012] In wood with lignin or lignin-derived chromophores, the amount of transparent resin with a refractive index that does not match that of wood nanocellulose is 5-95 wt.%.

[0013] The aforementioned wood laser scatterer has a transmittance of 0–90% and a reflectance of 0–99% in the visible light range, and a scattering rate (haze) of ≥60%. The wood laser scatterer can scatter laser light sources in the wavelength range of 400–800 nm into a three-dimensional uniform illumination source.

[0014] Another type of wood-based laser scatterer consists of lignin-free wood or lignin-free chromophore wood, a transparent resin impregnated into the internal pore structure of the wood, and a fluorescent material. It is manufactured by simultaneously impregnating the lignin-free wood or lignin-free chromophore wood into the internal pore structure, followed by photocuring or thermocuring.

[0015] The transparent resin can be any kind of transparent resin, that is, a transparent resin whose refractive index does not match the refractive index of wood nanocellulose, or other transparent resins, such as transparent resins whose refractive index matches the refractive index of wood nanocellulose.

[0016] The fluorescent material includes any one or a combination of two or more of the following: aluminate fluorescent materials, silicate fluorescent materials, nitride fluorescent materials, phosphate fluorescent materials, and sulfide fluorescent materials doped with rare earth elements. The fluorescent material has a particle size of 0.1–100 μm and is capable of scattering and converting laser light sources in the wavelength range of 400–800 nm into a three-dimensional uniform illumination source.

[0017] In the lignin-free wood or lignin-free chromophore wood, the amount of transparent resin and fluorescent material applied is 5-95 wt.%; the fluorescent material and transparent resin are uniformly mixed together, and the fluorescent material accounts for 1%-80% of the total mass of the mixture of fluorescent material and transparent resin.

[0018] In the two types of wood-based laser scatterers mentioned above, the lignin-removed wood refers to wood with a lignin content ≤10% by mass; the lignin-removed chromophores are those containing carbonyl, carboxyl, aldehyde, and ester functional groups in lignin with a content ≤10% by mass. The wood used can be any of the following: balsa wood, paulownia, cedar, poplar, ash, and pine. The density of the wood is 0.02 g / cm³. 3 -1.35g / cm 3 between.

[0019] In the two types of wood-based laser scatterers mentioned above, the macroscopic shape of the wood-based laser scatterer includes any one or a combination of two or more of the following: sphere, cylinder, ellipsoid, cube, cuboid, and cone. The diameter of the wood laser scatterer is between 5 mm and 100 mm; the density of the wood laser scatterer is 0.10–1.50 g / cm³. 3 .

[0020] Of the two types of wood-based laser scatterers mentioned above, the wood laser scatterer has an operating temperature below 200℃; and its laser damage threshold is 2000 W / cm². 2 above.

[0021] A method for preparing a wood-based laser scatterer involves impregnating a transparent resin with a refractive index mismatched to that of nanocellulose into the internal porous structure of lignin-free wood or wood containing lignin-free chromophores, comprising the following steps:

[0022] (1) Place the wood in a lignin extraction solution or a lignin modifier solution and heat it to 100°C until the wood turns completely white.

[0023] (2) The white wood block obtained in step (1) is placed in organic solvents such as acetone, ethanol and / or methanol for solvent replacement to obtain a white wood block containing organic solvents;

[0024] (3) Place the white wood block containing organic solvent obtained in step (2) into a transparent resin whose refractive index does not match that of wood nanocellulose, place it under vacuum conditions or in a natural environment, immerse the white wood block in the transparent resin whose refractive index does not match that of wood nanocellulose, and cure it with ultraviolet light or heat to obtain a wood laser scatterer.

[0025] In step (1), the lignin removal solution refers to sodium chlorite or sodium hypochlorite, or a mixture of both (mixed in any proportion), with a solute mass fraction concentration of 0.1-20%, and the pH of the aqueous solution is adjusted to pH 4-5 using acetic acid; the lignin modifier solution refers to a mixture including hydrogen peroxide and an alkaline substance, wherein the mass ratio of hydrogen peroxide to the alkaline substance is 10:(0.1-3). The alkaline substance is sodium hydroxide or potassium hydroxide, or a mixture of both (mixed in any proportion).

[0026] In step (1), the white wood block obtained is either lignin-free wood or lignin-free chromophore wood. In lignin-free wood, the lignin content is ≤10 wt.%; in lignin-free chromophore wood, the content of functional groups such as carbonyl, carboxyl, aldehyde, and ester groups in the lignin is ≤10 wt.%.

[0027] In step (2), the white wood block is soaked in an organic solvent for a sufficient time until the moisture in the white wood block is completely converted into the organic solvent. For example, the soaking time can be 0.1 min to 10 days.

[0028] In step (3), the transparent resin whose refractive index does not match that of wood nanocellulose has a refractive index <0.50 or >0.50; the soaking time of the white wood block containing organic solvent in the transparent resin whose refractive index does not match that of wood nanocellulose is not particularly limited, and can be 0.1 min to 20 days. The amount of the transparent resin whose refractive index does not match that of wood nanocellulose is 5-95 wt.%.

[0029] The wood laser scatterer has a transmittance of 0-90% and a reflectance of 0-99% in the visible light range, and a scattering rate (haze) of ≥60%. The wood laser scatterer can scatter laser light sources in the wavelength range of 400-800nm ​​into a three-dimensional uniform illumination source.

[0030] Another method for preparing a wood-based laser scatterer involves simultaneously impregnating lignin-free wood or wood with lignin-free chromophores into its internal porous structure, followed by photocuring or thermocuring. The laser fluorescent illuminating material and the transparent resin are uniformly mixed together. The method includes the following steps:

[0031] 1) Place the wood in a lignin extraction solution or a lignin modifier solution and heat it to 100°C until the wood turns completely white;

[0032] 2) Place the white wood block obtained in step 1) into an organic solvent such as acetone, ethanol and / or methanol for solvent exchange to obtain a white wood block containing organic solvent;

[0033] 3) Mix the fluorescent material with the transparent resin evenly, put the white wood block containing organic solvent obtained in step 2) into the mixing system, place it under vacuum conditions or in a natural environment, and cure it with ultraviolet light or heat to obtain a wood laser scatterer.

[0034] In step 1), the resulting white wood block is either lignin-free wood or lignin-free chromophore wood. In lignin-free wood, the lignin content is ≤10 wt.%; in lignin-free chromophore wood, the content of functional groups such as carbonyl, carboxyl, aldehyde, and ester groups in the lignin is ≤10 wt.%.

[0035] In step 2), the white wood block is soaked in an organic solvent for a sufficient time until the moisture in the white wood block is completely converted into organic solvent. For example, the soaking time can be 0.1 min to 10 days.

[0036] In step 3), the fluorescent material has a particle size of 0.1–100 μm, capable of scattering and converting laser light sources in the wavelength range of 400–800 nm into a three-dimensional uniform illumination source; the fluorescent material can convert ultraviolet, visible, or infrared light into white light; the fluorescent material includes aluminate fluorescent materials doped with rare earth elements (such as aluminate phosphor Y3Al5O). 12 Ce), silicate fluorescent materials (such as silicate phosphor (SrBa)₂SiO₄), nitride fluorescent materials (such as CaAlSiN₃), and phosphate fluorescent materials (such as phosphate phosphor Ba₃P₄O₄). 13 :xEu 3+ ) and sulfide fluorescent materials (such as sulfide phosphors aGeS2-bGa2S3:cTm) 3+ It may be any one or a combination of two or more of the following: (e.g., ) The transparent resin may be any type of transparent resin. The fluorescent material comprises 1%-80% of the total mass of the fluorescent material and the transparent resin.

[0037] The soaking time of white wood blocks containing organic solvents in a mixture of fluorescent material and transparent resin is not particularly limited and can range from 0.1 min to 20 days. The application amount of fluorescent material and transparent resin is 5-95 wt.%.

[0038] This invention relates to the application of the two wood-based laser scatterers described above in the field of laser lighting, particularly in the preparation of laser lighting materials. The wood-based laser scatterers can be used as lighting materials in the fields of seabed lighting, underwater lighting, indoor lighting, outdoor lighting, long-distance non-contact lighting, adjustable light color lighting, laser scattering, and laser display.

[0039] The laser irradiation method for any one or a combination of the two methods described above for preparing wood-based laser scatterers includes two approaches: First, the wood-based laser scatterer is irradiated with a laser source of a selected wavelength, thereby scattering the laser source into a three-dimensional uniform light source. Second, the laser irradiation method uses both the wood-based laser scatterer and a cover containing fluorescent material as illumination materials. The wood-based laser scatterer is placed inside the cover containing fluorescent material, which consists of a substrate and fluorescent material coated on its surface. The wood-based laser scatterer inside the cover is irradiated with a laser source of a selected wavelength, and the scattered laser light becomes a three-dimensional uniform light source after passing through the cover.

[0040] In the two laser irradiation emission methods described above, the wood-based laser scatterer is irradiated with a laser light source of a selected wavelength, thereby causing the laser light to be scattered into a three-dimensional uniform light source; wherein, the wavelength of the laser light source is 400-800nm.

[0041] In the second laser irradiation emission method described above, the cover containing fluorescent material includes a substrate, fluorescent material, and an adhesive. The substrate is composed of a light-transmitting material, including any one or a combination of two or more of epoxy resin, silica glass, polymethyl methacrylate, borosilicate glass, alumina transparent ceramic, and organosilicon. The mass ratio of fluorescent material to substrate in the cover containing fluorescent material is 1:1 to 1000.

[0042] Fluorescent material is mixed with an adhesive and coated onto the inner surface of a substrate to obtain a cover containing fluorescent material. The adhesive can be polymethyl methacrylate and / or epoxy resin.

[0043] The fluorescent material can convert ultraviolet, visible, or infrared light into white light; the fluorescent material includes aluminate fluorescent materials doped with rare earth elements (such as aluminate phosphor Y3Al5O). 12Ce), silicate fluorescent materials (such as silicate phosphor (SrBa)₂SiO₄), nitride fluorescent materials (such as CaAlSiN₃), and phosphate fluorescent materials (such as phosphate phosphor Ba₃P₄O₄). 13 :xEu 3+ ) and sulfide fluorescent materials (such as sulfide phosphors aGeS2-bGa2S3:cTm) 3+ Any one or more combinations of ) etc.

[0044] The transmittance of the fluorescent material-containing cover is 0.1% to 99% in the wavelength range of 200 to 1000 nm; the shape of the fluorescent material-containing cover includes any one of hollow spheres, hollow cubes, hollow cuboids, hollow ellipsoids, and irregular shapes.

[0045] Compared with the prior art, the advantages of the present invention include at least the following:

[0046] 1) The basic structural unit of the laser scatterer provided by the present invention is composed of a transparent resin with a refractive index that does not match the refractive index of nanocellulose, which is impregnated into the internal pore structure of wood with lignin removed or wood with lignin chromophores removed. It has a high scattering rate and can realize multiple scattering of the beam, scattering the highly concentrated laser source into a three-dimensional uniform light source.

[0047] 2) The structure of the laser scatterer provided by the present invention can also be that transparent resin and fluorescent material are simultaneously impregnated into the internal pore structure of wood with lignin removed or wood with lignin chromophore removed.

[0048] 3) The laser wood lighting material provided by this invention breaks through people's traditional understanding of wood, expands the boundaries of people's understanding of wood, and opens a precedent for the application of wood in high-tech fields.

[0049] 4) The wood-based laser scatterer lighting material provided by this invention exhibits good mechanical properties in the range of -196℃ to 300℃, can withstand compression, impact and other loads, and has good water resistance.

[0050] 5) The wood-based laser illumination material provided by this invention has an extremely high laser damage threshold and can withstand high power density laser irradiation.

[0051] 6) The wood-based laser lighting material provided by this invention has a high scattering rate, which can realize multiple scattering of the beam and scatter the highly concentrated laser light source into a three-dimensional uniform light source. Utilizing this characteristic, red, green and blue lasers can be used to simultaneously irradiate the scattering body lighting material, which can convert the three colors of light into white light to achieve white light lighting.

[0052] 7) The preparation process of the wood-based laser scatterer lighting material provided by this invention is simple, the reaction conditions are mild, it is easy to operate, has low energy consumption, low cost, is green and pollution-free, and can realize large-scale continuous production.

[0053] 8) The laser scatterer provided by this invention uses wood as raw material, making it green, environmentally friendly, and naturally biodegradable. It has enormous application potential in the fields of seabed lighting, underwater lighting, indoor lighting, outdoor lighting, long-distance contactless lighting, adjustable light color lighting, laser scattering, and laser display. This invention not only promotes green and high-quality development in the laser field but also facilitates the application of wood in high-value-added sectors. Attached Figure Description

[0054] Figures 1(a) to 1(c) These are, respectively, microstructure diagrams of the original wood, lignin-removed wood, and wood impregnated with polyethylene glycol diacrylate in Example 1.

[0055] Figure 2 This is a diagram showing the laser irradiation effect on the original spherical wood in Example 1.

[0056] Figure 3 This is a diagram showing the laser irradiation effect on a spherical polyethylene glycol diacrylate ester in Example 1.

[0057] Figure 4 This is the lighting effect of irradiating polyethylene glycol diacrylate spherical wood with a 532nm wavelength green laser in Example 1;

[0058] Figure 5 This refers to the light variation coefficient of the 532nm green laser irradiation used in Example 1 on the polyethylene glycol diacrylate spherical wood.

[0059] Figure 6 This is a white light effect diagram when a 638nm red laser, a 532nm green laser, and a 450nm blue laser simultaneously irradiate a spherical wood impregnated with polyethylene glycol diacrylate in Example 1.

[0060] Figures 7(a) to 7(c) These are, respectively, microstructure diagrams of the original wood, lignin-removed wood, and wood impregnated with polyethylene glycol diacrylate in Example 2.

[0061] Figure 8 This refers to the light variation coefficient of the 532nm green laser irradiation used in Example 2 on the polyethylene glycol diacrylate spherical wood.

[0062] Figure 9 This is a white light effect diagram when a 638nm red laser, a 532nm green laser, and a 450nm blue laser simultaneously irradiate a spherical wood impregnated with polyethylene glycol diacrylate in Example 2.

[0063] Figure 10 This refers to the light variation coefficient of the 532nm green laser irradiation of the polyethylene glycol diacrylate spherical wood in Example 3.

[0064] Figure 11 This is a white light effect diagram when a 638nm red laser, a 532nm green laser, and a 450nm blue laser simultaneously irradiate a spherical wood impregnated with polyethylene glycol diacrylate in Example 3.

[0065] Figure 12 The light variation coefficient of the 532nm green laser irradiation of the polyethylene glycol diacrylate spherical wood in Example 4;

[0066] Figure 13 This is a white light effect diagram when a 638nm red laser, a 532nm green laser, and a 450nm blue laser simultaneously irradiate a spherical wood impregnated with polyethylene glycol diacrylate in Example 4.

[0067] Figure 14 The light variation coefficient of the polyethylene glycol diacrylate spherical wood irradiated with 532nm green laser in Example 5;

[0068] Figure 15 This is a white light effect diagram of the 638nm red laser, 532nm green laser and 450nm blue laser simultaneously irradiating the polyethylene glycol diacrylate spherical wood in Example 5;

[0069] Figure 16 This is a white light effect diagram when 638nm red laser, 532nm green laser and 450nm blue laser simultaneously irradiate epoxy acrylate impregnated spherical wood.

[0070] Figure 17 This is an image showing the white light emitted when polyurethane-modified epoxy resin spherical wood is simultaneously irradiated by a 638nm red laser, a 532nm green laser, and a 450nm blue laser in Example 7.

[0071] Figure 18 This is an image showing the effect of white light emitted when a 532nm green laser irradiates polyvinylpyrrolidone-impregnated spherical wood in Example 8.

[0072] Figure 19 This is an image showing the effect of white light emitted when a 532nm green laser irradiates polydimethylsiloxane-impregnated spherical wood in Example 9.

[0073] Figure 20 This is a white light effect diagram when 638nm red laser, 532nm green laser and 450nm blue laser simultaneously irradiate polyethylene glycol impregnated spherical wood in Example 10;

[0074] Figure 21 This is a white light effect diagram when a 638nm red laser, a 532nm green laser, and a 450nm blue laser simultaneously irradiate a spherical wood impregnated with dimethyldimethoxysilane, as shown in Example 11. Detailed Implementation

[0075] In view of the shortcomings of the prior art, the present invention, through long-term research and extensive practice, has proposed a technical solution, the implementation process of which and its principles will be further explained below. The accompanying drawings described below are merely some embodiments described in this invention.

[0076] This invention provides a wood-based laser scatterer, wherein the wood laser scatterer illumination material is realized through two steps: scatterer preparation and laser irradiation. The scatterer can be prepared by two methods.

[0077] First step: Preparation of scatterers. The first method involves impregnating lignin-free wood or wood containing lignin-free chromophores with a transparent resin whose refractive index does not match that of nanocellulose into the internal porous structure of the wood. The refractive index mismatched with that of nanocellulose resin refers to a resin with a refractive index <1.53 or >1.53; preferably, the refractive index is less than 1.5 or >1.5, more preferably less than 1.45 or >1.55; the lignin-free wood refers to wood with a lignin content ≤10%; preferably ≤5%; the lignin-free chromophores are lignin with a content of ≤10% for carbonyl, carboxyl, aldehyde, ester, and other functional groups; preferably ≤5%; the transmittance of the wood laser scatterer in the visible light range is 0-90%, preferably 0-50%, more preferably 0-25%; the reflectance is 0-99%, preferably 30-60%; the scattering rate, i.e., haze, is ≥50%; preferably ≥70%; the wood laser scatterer can scatter laser light sources in the wavelength range of 400-800nm ​​into a three-dimensional uniform illumination source. The second method involves simultaneously impregnating transparent resin and fluorescent material into the internal porous structure of wood with lignin or lignin-derived chromophores, followed by photocuring or thermocuring. The laser fluorescent lighting material and resin are uniformly mixed together. The fluorescent material has a particle size of 0.1–100 μm and can scatter and convert laser light sources in the 400–800 nm wavelength range into a three-dimensional uniform lighting source. The fluorescent material can convert ultraviolet, visible, or infrared light into white light. The fluorescent material includes aluminate fluorescent materials doped with rare earth elements (such as aluminate phosphor Y3Al5O). 12Ce), silicate fluorescent materials (such as silicate phosphor (SrBa)₂SiO₄), nitride fluorescent materials (such as CaAlSiN₃), and phosphate fluorescent materials (such as phosphate phosphor Ba₃P₄O₄). 13 :xEu 3+ ), sulfide fluorescent materials (such as sulfide phosphors aGeS2-bGa2S3:cTm) 3+ It can be any one or more of the following, and is not limited thereto: (e.g., transparent resin, etc.). The transparent resin mentioned is any kind of transparent resin.

[0078] The second step: Laser irradiation for light emission. The first method involves irradiating the wood laser scatterer with a laser source of a selected wavelength, thereby scattering the laser source into a three-dimensionally uniform light source. The second method is characterized in that the laser irradiation for light emission is based on a wood laser scatterer and a cover containing fluorescent material. The wood laser scatterer is placed inside the cover containing fluorescent material, which includes a substrate and fluorescent material. The wood laser scatterer inside the cover is irradiated with a laser source of a selected wavelength, and the scattered laser light passes through the cover to become a three-dimensionally uniform light source. The fluorescent material can convert ultraviolet, visible, or infrared light into white light.

[0079] The scatterer preparation method described in this invention can be any one of the two methods or a combination of the two.

[0080] The wood can be any type of wood, such as balsa wood, paulownia wood, cedar wood, poplar wood, ash wood, or pine wood. The density of the wood is 0.02 g / cm³. 3 -1.35g / cm 3 The density of the wood laser scatterer is preferably between 0.1 and 0.2 g / cm³; the resin refers to one or more of the following: polyethylene glycol diacrylate, epoxy acrylate, acrylate derivatives, polyurethane prepolymer, polyurethane modified epoxy resin, polyvinylpyrrolidone, polyethylene glycol, polydimethylsiloxane, tetramethyl orthosilicate, tetraethyl orthosilicate, methyltrimethoxysilane, dimethyldimethoxysilane, dimethyldiethoxysilane, and silicone rubber; the macroscopic shape of the wood laser scatterer includes any one or more combinations of spheres, cylinders, ellipsoids, cubes, cuboids, and cones; the diameter of the wood laser scatterer is between 5 mm and 100 mm, preferably 5-20 mm, and the density of the wood laser scatterer is 0.10–1.50 g / cm³. 3 The wood laser scatterer is used at temperatures below 200℃; the laser damage threshold of the wood laser scatterer is 2000 W / cm². 2 above.

[0081] The first method for preparing a wood laser scattering illumination material includes: 1) placing wood in a lignin extraction solution or a lignin modifier solution and heating it to 100°C until the wood turns completely white. 2) placing the white wood block obtained in step 1) into organic solvents such as acetone, ethanol, or methanol for solvent displacement to obtain a white wood block containing organic solvents. 3) placing the white wood block containing organic solvents obtained in step 2) into a transparent resin whose refractive index does not match that of wood nanocellulose, placing it under vacuum conditions or in a natural environment, immersing the white wood block in the transparent resin whose refractive index does not match that of wood nanocellulose, and then curing it with ultraviolet light or heat to obtain a wood laser scattering material.

[0082] The second method for preparing wood laser scattering illumination material includes: 1) using lignin removal liquid or lignin modification liquid to turn wood into white wood, and placing it in an organic solvent to replace the moisture in the wood; 2) uniformly mixing fluorescent material with transparent resin, then placing white wood blocks into the mixing system, placing them under vacuum conditions or in a natural environment, and curing them with ultraviolet light or heat to obtain wood laser scattering material.

[0083] In the above method, the lignin extraction solution refers to sodium chlorite or sodium hypochlorite, or a mixture of both, with a solute mass fraction concentration of 0.1-20%, and the pH value of the aqueous solution is adjusted to 4-5 using acetic acid; the lignin modifier solution refers to a mixture comprising hydrogen peroxide and an alkaline solution, wherein the mass ratio of hydrogen peroxide to alkaline solution is 10:(0.1-3). The alkaline solution is sodium hydroxide or potassium hydroxide, or a mixture of both.

[0084] The application of wood-based laser scatterers prepared by the above two methods in laser illumination includes: A first method involves irradiating the wood-based laser scatterer with a laser source of a selected wavelength, thereby scattering the laser light into a three-dimensionally uniform light source; wherein the wavelength of the laser source is 400–800 nm. A second method involves irradiating a luminescent material composed of a wood-based laser scatterer and a cover containing fluorescent material. The wood-based laser scatterer is placed inside the cover containing fluorescent material, which includes a substrate and fluorescent material. The wood-based laser scatterer inside the cover is irradiated with a laser source of a selected wavelength, and the scattered laser light passes through the cover to become a three-dimensionally uniform light source.

[0085] The substrate is composed of a light-transmitting material, including any one or a combination of two or more of epoxy resin, silica glass, polymethyl methacrylate, borosilicate glass, transparent alumina ceramic, and organosilicon; the transmittance of the cover in the 200–1000 nm light wavelength range is 0.1–99%; the shape of the cover containing fluorescent material includes any one of hollow spheres, hollow cubes, hollow cuboids, hollow ellipsoids, and irregular shapes; preferably, it is a hollow sphere. The mass ratio of fluorescent material to substrate in the cover containing fluorescent material is 1:1–1000. The fluorescent material can convert ultraviolet, visible, or infrared light into white light; the fluorescent material includes aluminate fluorescent materials doped with rare earth elements (such as aluminate phosphor Y3Al5O). 12 Ce), silicate fluorescent materials (such as silicate phosphor (SrBa)₂SiO₄), nitride fluorescent materials (such as CaAlSiN₃), and phosphate fluorescent materials (such as phosphate phosphor Ba₃P₄O₄). 13 :xEu 3+ ), sulfide fluorescent materials (such as sulfide phosphors aGeS2-bGa2S3:cTm) 3+ Any one or more combinations of, etc., and not limited to, etc.

[0086] The wood laser scatterer of the present invention can be used as a lighting material, especially as a laser lighting material, and can be applied in the fields of seabed lighting, underwater lighting, indoor lighting, outdoor lighting, long-distance non-contact lighting, adjustable light color lighting, laser scattering, and laser display.

[0087] This invention relates to a wood-based laser scatterer lighting material, which allows for the controllability of wood density to achieve controllable transmittance, controllable reflectivity, controllable density, controllable lighting uniformity, excellent thermal stability, and a high laser damage threshold.

[0088] The particle size controllable laser scatterer provided by this invention exhibits good mechanical properties in the range of -196℃ to 200℃ and can withstand tensile, compressive and other loads.

[0089] The technical solution of the present invention will be further described in detail below with reference to several preferred embodiments and accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention. Experimental methods in the following embodiments that do not specify specific conditions are generally performed under conventional conditions or according to the conditions recommended by the manufacturer.

[0090] Example 1

[0091] 1) The density is 0.07 g / cm³3 A 1.5cm diameter spherical balsa wood was placed in a 2.0% sodium chlorite solution (pH adjusted to 4.5 with acetic acid) and boiled at 100°C until the balsa wood turned completely white. The balsa wood was then removed and tested to find that the lignin content was 5.75%.

[0092] 2) Place the white balsa wood skeleton obtained in step 1) into acetone solvent to completely convert the water, and then place it into polyethylene glycol diacrylate liquid. Under vacuum conditions, immerse the balsa wood skeleton in polyethylene glycol diacrylate with a refractive index of 1.47; the immersion time is 2 hours, and the amount of transparent resin applied is 70 wt.%.

[0093] 3) Place the balsa wood frame obtained in step 2) under a UV lamp for photocuring. The power of the UV lamp is 100W / cm². 2 A laser scattering body was obtained by illuminating the balsa wood for 15 seconds. A green laser with a wavelength of 532nm was then used to irradiate this scattering body, and the highly concentrated laser light was uniformly scattered into three-dimensional space, achieving the desired illumination effect.

[0094] Figures 1(a), 1(b), and 1(c) show the microstructures of the original wood, the wood after lignin removal, and the wood impregnated with polyethylene glycol diacrylate, respectively, in Example 1. Figure 1(a) shows that the wood exhibits a porous structure with tightly connected cells. Figure 1(b) shows that after lignin removal, the wood's cell structure remains intact under microscopic conditions, and the cells remain tightly connected, indicating that lignin removal has no significant impact on the wood structure. Figure 1(c) shows that after impregnation with polyethylene glycol diacrylate and curing, the wood's cell structure remains intact under microscopic conditions, with the polyethylene glycol diacrylate completely filling the cell cavities, thus preparing a wood laser scatterer.

[0095] like Figure 2 The image shows the illumination effect of laser irradiation on the original spherical wood in Example 1. As can be seen from the image, the original spherical wood can only reflect the laser on the laser incident side to achieve laser illumination on that side, but it cannot scatter the laser in three-dimensional space around the wood, thus failing to achieve a three-dimensional spatial illumination effect.

[0096] like Figure 3 The image shows the illumination effect of laser irradiation on spherical polyethylene glycol diacrylate in Example 1. As can be seen from the image, when the laser irradiates the spherical polyethylene glycol diacrylate, the laser propagates directly along the diameter of the spherical resin and cannot be scattered around the spherical resin, thus failing to achieve the laser illumination effect.

[0097] like Figure 4As shown in the figure, the illumination effect of a 532nm wavelength green laser irradiating a spherical wood impregnated with polyethylene glycol diacrylate in Example 1 is as follows: When the laser irradiates the spherical wood impregnated with polyethylene glycol diacrylate (i.e., the wood laser scatterer), the laser is scattered around the spherical scatterer, which has a good lighting effect, indicating that the scatterer can achieve laser illumination.

[0098] like Figure 5 The figure shows the illuminance variation coefficient of 532nm green laser irradiation on polyethylene glycol diacrylate spherical wood in Example 1. The vertical axis represents the illuminance (lux), with 0 being the point of zero illuminance. The horizontal axis is the line intersecting 0 and perpendicular to the vertical axis. The center point of the circle on the horizontal axis is the position of the spherical wood scatterer. The circular curve represents the 360° direction around the spherical wood laser scatterer. The figure shows that 0.07 g / cm³ was used. 3 The balsa wood laser scatterer has an illumination variation coefficient of 80.04%. Although it can achieve three-dimensional spatial illumination, the illumination intensity is very high in the 0° direction of the coordinate system, indicating that a large amount of laser light is transmitted through the scatterer in the 0° direction.

[0099] like Figure 6 The image shows the white light emitted when 638nm red laser, 532nm green laser, and 450nm blue laser simultaneously irradiate spherical wood impregnated with polyethylene glycol diacrylate in Example 1. The image shows that when red, green, and blue lasers are used to simultaneously irradiate the wood scatterer, the three colors of light can be emitted at a concentration of 0.07 g / cm³. 3 The laser scatterer, made of spherical wood, mixes internally and emits white light, thus achieving a white light illumination effect.

[0100] Example 2

[0101] 1) The density is 0.12 g / cm³ 3 A 1.5cm diameter spherical balsa wood was placed in a 4.0% sodium chlorite solution (pH adjusted to 4.5 with acetic acid) and boiled at 100°C until the balsa wood turned completely white. The balsa wood was then removed and tested to find that the lignin content was 7.52%.

[0102] 2) Place the white balsa wood skeleton obtained in step 1) into acetone solvent to completely convert the water, and then place it into polyethylene glycol diacrylate liquid. Under vacuum conditions, immerse the balsa wood skeleton in polyethylene glycol diacrylate with a refractive index of 1.47; the immersion time is 5 hours, and the amount of transparent resin applied is 60 wt.%.

[0103] 3) Place the balsa wood frame obtained in step 2) under a UV lamp for photocuring. The power of the UV lamp is 100W / cm².2 The light was applied for 15 seconds to create a balsa wood laser scatterer. This scatterer was then irradiated with a 532nm laser, resulting in highly concentrated laser light that was uniformly scattered into three-dimensional space, achieving the desired lighting effect.

[0104] Figures 7(a), 7(b), and 7(c) show the microstructures of the original wood, the wood after lignin removal, and the wood impregnated with polyethylene glycol diacrylate, respectively, in Example 2. Figure 7(a) shows that the wood exhibits a porous structure with tightly connected cells, and its density is greater than that of the wood in Figure 1(a), with thicker cell walls. Figure 7(b) shows that after lignin removal, the wood's cell structure remains intact under microscopic conditions, and the cells remain tightly connected, indicating that lignin removal has no significant impact on the wood structure. Figure 7(c) shows that after impregnation with polyethylene glycol diacrylate and curing, the wood's cell structure remains intact under microscopic conditions, with the polyethylene glycol diacrylate completely filling the cell cavities, thus preparing a wood laser scatterer.

[0105] like Figure 8 As shown, this is the photoluminescence variation coefficient of 532nm green laser irradiation on polyethylene glycol diacrylate spherical wood in Example 2. The vertical axis represents the light intensity (lux), with 0 points representing zero illuminance. The horizontal axis is the line intersecting 0 points and perpendicular to the vertical axis. The center point of the circle on the horizontal axis is the position of the spherical wood scatterer. The circular curve represents the laser scatterer in the 360° direction around the spherical wood. The figure shows that 0.12 g / cm³ was used. 3 The balsa wood laser scatterer has specific values ​​in all directions of the coordinate system, indicating that it can achieve three-dimensional spatial illumination. Its illumination variation coefficient is 17.65%, which is significantly lower than that of Example 1, indicating a significant improvement in illumination uniformity and making it more conducive to achieving three-dimensional spatial illumination. This demonstrates that the balsa wood laser scatterer can effectively scatter laser light.

[0106] like Figure 9 The image shows the white light emitted when 638nm red laser, 532nm green laser, and 450nm blue laser simultaneously irradiate spherical wood impregnated with polyethylene glycol diacrylate in Example 2. The image demonstrates that when red, green, and blue lasers are used to simultaneously irradiate the wood scatterer, the three colors of light can be emitted at a concentration of 0.12 g / cm³. 3 The laser scatterer, made of spherical wood, mixes internally and emits white light, thus achieving a white light illumination effect.

[0107] Example 3

[0108] 1) The density is 0.18 g / cm³ 3 A 1.5cm diameter spherical balsa wood was placed in a 2.5% sodium chlorite solution (pH adjusted to 4.5 with acetic acid) and boiled at 100°C until the balsa wood turned completely white. The balsa wood was then removed and tested to find that the lignin content was 8.75%.

[0109] 2) Place the white balsa wood skeleton obtained in step 1) into acetone solvent to completely convert the water, and then place it into polyethylene glycol diacrylate liquid. Under vacuum conditions, immerse the balsa wood skeleton in polyethylene glycol diacrylate with a refractive index of 1.47; the immersion time is 10 hours or the amount of transparent resin applied is 50 wt.%.

[0110] 3) Place the balsa wood frame obtained in step 2) under a UV lamp for photocuring. The power of the UV lamp is 100W / cm². 2 The light was applied for 15 seconds to create a balsa wood laser scatterer. This scatterer was then irradiated with a 532nm laser, resulting in highly concentrated laser light that was uniformly scattered into three-dimensional space, achieving the desired lighting effect.

[0111] like Figure 10 The figure shows the illuminance variation coefficient of 532nm green laser irradiation on polyethylene glycol diacrylate spherical wood in Example 3. The vertical axis represents the illuminance (lux), with 0 points representing zero illuminance. The horizontal axis is the line intersecting 0 points and perpendicular to the vertical axis. The center point of the circle on the horizontal axis is the position of the spherical wood scatterer. The circular curve represents the laser scatterer in the 360° direction around the spherical wood. As can be seen from the figure, 0.18 g / cm³ was used. 3 The balsa wood laser scatterer has an illumination variation coefficient of 23.64%. Compared with Example 2, the illumination variation coefficient of this wood laser scatterer is higher, indicating that its illumination uniformity is slightly reduced. However, there are specific values ​​in all 360° spatial directions on the coordinate system, indicating that the wood laser scatterer can achieve three-dimensional spatial illumination. The illumination intensity is relatively uniform in all directions of the coordinate system, and the wood laser scatterer can scatter laser light very well.

[0112] like Figure 11 The image shows the white light emitted when 638nm red laser, 532nm green laser, and 450nm blue laser simultaneously irradiate spherical wood impregnated with polyethylene glycol diacrylate in Example 3. The image shows that when red, green, and blue lasers are used to simultaneously irradiate the wood scatterer, the three colors of light can be emitted at a concentration of 0.18 g / cm³. 3 The laser scatterer, made of spherical wood, mixes internally and emits white light, thus achieving a white light illumination effect.

[0113] Example 4

[0114] 1) The density is 0.26 g / cm³ 3 A 1.5cm diameter spherical paulownia wood was placed in a 3% sodium chlorite solution (pH adjusted to 4.5 with acetic acid) and boiled at 100°C until the balsa wood turned completely white. The wood was then removed and tested to find that the lignin content was 5.05%.

[0115] 2) Place the white balsa wood skeleton obtained in step 1) into acetone solvent to completely convert the water, and then place it into polyethylene glycol diacrylate liquid. Under vacuum conditions, immerse the balsa wood skeleton in polyethylene glycol diacrylate with a refractive index of 1.47; the immersion time is 10 hours, and the amount of transparent resin applied is 45 wt.%.

[0116] 3) Place the balsa wood frame obtained in step 2) under a UV lamp for photocuring. The power of the UV lamp is 100W / cm². 2 The light was applied for 15 seconds to create a balsa wood laser scatterer. This scatterer was then irradiated with a 532nm laser, resulting in highly concentrated laser light that was uniformly scattered into three-dimensional space, achieving the desired lighting effect.

[0117] like Figure 12 The figure shows the photoluminescence variation coefficient of 532nm green laser irradiation on polyethylene glycol diacrylate spherical wood in Example 4. The vertical axis represents the light intensity (lux), with 0 points representing zero illuminance. The horizontal axis is the line intersecting 0 points and perpendicular to the vertical axis. The center point of the circle on the horizontal axis is the position of the spherical wood scatterer. The circular curve represents the 360° direction around the spherical wood laser scatterer. The figure shows that 0.26 g / cm³ was used. 3 The wood laser scatterer made of paulownia wood has an illumination variation coefficient of 26.77%. Compared with Example 3, the illumination variation coefficient of this wood laser scatterer is higher, indicating that its illumination uniformity is slightly reduced. However, there are specific values ​​in all 360° spatial directions on the coordinate system, indicating that the wood laser scatterer can achieve three-dimensional spatial illumination. The illumination intensity is relatively uniform in all directions of the coordinate system, and the wood laser scatterer can scatter laser light very well.

[0118] like Figure 13 The image shows the white light emitted when 638nm red laser, 532nm green laser, and 450nm blue laser simultaneously irradiate spherical wood impregnated with polyethylene glycol diacrylate in Example 4. The image shows that when red, green, and blue lasers are used to simultaneously irradiate the wood scatterer, the three colors of light can be emitted at a concentration of 0.26 g / cm³. 3 The laser scatterer, made from spherical paulownia wood, mixes internally and emits white light, thus providing a white light illumination effect.

[0119] Example 5

[0120] 1) The density is 0.56 g / cm³ 3 A 1.5cm diameter spherical pine wood was placed in a 10% sodium chlorite solution (pH adjusted to 4.5 with acetic acid) and boiled at 100°C until the balsa wood turned completely white. The wood was then removed and tested to find that the lignin content was 4.72%.

[0121] 2) Place the white balsa wood skeleton obtained in step 1) into acetone solvent to completely convert the water, and then place it into polyethylene glycol diacrylate liquid. Under vacuum conditions, immerse the balsa wood skeleton in polyethylene glycol diacrylate with a refractive index of 1.47; the soaking time is 5 days, and the amount of transparent resin applied is 45 wt.%.

[0122] 3) Place the balsa wood frame obtained in step 2) under a UV lamp for photocuring. The power of the UV lamp is 100W / cm². 2 The light was applied for 15 seconds to create a balsa wood laser scatterer. This scatterer was then irradiated with a 532nm laser, resulting in highly concentrated laser light that was uniformly scattered into three-dimensional space, achieving the desired lighting effect.

[0123] like Figure 14 The figure shows the photoluminescence variation coefficient of 532nm green laser irradiation on polyethylene glycol diacrylate spherical wood in Example 5. The vertical axis represents the light intensity (lux), with 0 points representing zero illuminance. The horizontal axis is the line intersecting 0 points and perpendicular to the vertical axis. The center point of the circle on the horizontal axis is the position of the spherical wood scatterer. The circular curve represents the laser scatterer in the 360° direction around the spherical wood. As can be seen from the figure, 0.56 g / cm³ was used. 3 The pine wood laser scatterer has an illumination variation coefficient of 46.31%. Compared with Example 4, the illumination variation coefficient of this wood laser scatterer is further increased, indicating a decrease in illumination uniformity. However, specific values ​​are present in all 360° spatial directions on the coordinate system, indicating that this wood laser scatterer can achieve three-dimensional spatial illumination. The illumination intensity is relatively uniform in all directions of the coordinate system, and the wood laser scatterer can scatter laser light effectively. Furthermore, as shown in the figure, the illumination in the 90° to 270° range is significantly greater than that in the 0° to 90° and 270° to 360° ranges. This indicates that the higher the wood density, the greater the reflection and the less the transmission of the scatterer.

[0124] like Figure 15The image shows the white light emitted when 638nm red laser, 532nm green laser, and 450nm blue laser simultaneously irradiate spherical wood impregnated with polyethylene glycol diacrylate in Example 5. The image demonstrates that when red, green, and blue lasers are used to simultaneously irradiate the wood scatterer, the three colors of light can be emitted at a concentration of 0.56 g / cm³. 3 The laser scatterer, made from spherical paulownia wood, mixes internally and emits white light, thus providing a white light illumination effect.

[0125] Example 6

[0126] 1) The density is 0.12 g / cm³ 3 A 1.5cm diameter spherical balsa wood was placed in a modifier solution and boiled at 100℃. The modifier solution was a mixture of hydrogen peroxide and sodium hydroxide, with a mass ratio of hydrogen peroxide to sodium hydroxide of 10:1. The mixture was boiled until the balsa wood turned completely white. The wood was then removed and tested to find that the lignin content was 5.75%.

[0127] 2) Place the white balsa wood skeleton obtained in step 1) into acetone solvent to completely convert the water, and then place it into epoxy acrylate liquid. Immerse the balsa wood skeleton in epoxy acrylate with a refractive index of 1.51 under vacuum conditions; the immersion time is 10h, and the amount of transparent resin applied is 65wt.%.

[0128] 3) Place the balsa wood frame obtained in step 2) under a UV lamp for photocuring. The power of the UV lamp is 100W / cm². 2 The light was applied for 15 seconds to create a balsa wood laser scatterer. This scatterer was then irradiated with a 532nm laser, resulting in highly concentrated laser light that was uniformly scattered into three-dimensional space, achieving the desired lighting effect.

[0129] like Figure 16 The image shows the white light emitted when 638nm red laser, 532nm green laser, and 450nm blue laser simultaneously irradiate epoxy acrylate-impregnated spherical wood in Example 6. The image demonstrates that when red, green, and blue lasers are used to simultaneously irradiate the wood scatterer, the three colors of light can be emitted at a concentration of 0.12 g / cm³. 3 The laser scatterer, made from spherical balsa wood, emits white light through internal mixing, providing a white light illumination effect. This indicates that laser scatterers can also be manufactured by modifying lignin.

[0130] Example 7

[0131] 1) The density is 0.12 g / cm³ 3A 1.5cm diameter spherical balsa wood was placed in a modifier solution and boiled at 100℃. The modifier solution was a mixture of hydrogen peroxide and sodium hydroxide, with a mass ratio of hydrogen peroxide to sodium hydroxide of 10:0.5. The balsa wood was boiled at 100℃ until it turned completely white. It was then removed and tested to find that the lignin content was 8.75%.

[0132] 2) Place the white balsa wood skeleton obtained in step 1) into acetone solvent to completely convert the water, and then place it into polyurethane modified epoxy resin liquid. Under vacuum conditions, immerse the balsa wood skeleton in polyurethane modified epoxy resin with a refractive index of 1.35; the immersion time is 15h, and the amount of transparent resin applied is 65wt.%.

[0133] 3) Place the balsa wood skeleton obtained in step 2) in an oven for heat curing at a temperature of 120°C for 3 hours to obtain a balsa wood laser scattering body.

[0134] 4) A lampshade containing phosphor is obtained by coating nitride phosphor / CaAlSiN3 and polymethyl methacrylate binder on the inner surface of epoxy resin lampshade substrate. The mass ratio of nitride phosphor / CaAlSiN3, polymethyl methacrylate binder and epoxy resin lampshade substrate is 1:0.5:0.5.

[0135] 5) Fix the laser scatterer with controllable particle size obtained in step 3) inside the lampshade containing phosphor prepared in step 4), and irradiate the scatterer with 638nm red laser, 532nm green laser and 450nm blue laser. The highly concentrated laser is uniformly scattered into three-dimensional space to achieve white light illumination effect.

[0136] like Figure 17 The image shows the effect of white light emitted when a 638nm red laser, a 532nm green laser, and a 450nm blue laser simultaneously irradiate a polyurethane-modified epoxy resin-impregnated spherical wood in Example 7. As can be seen from the image, when the wood scatterer is irradiated by red, green, and blue lasers simultaneously, the three colors of light can mix inside the laser scatterer containing nitride phosphor / CaAlSiN3 to emit white light, thus achieving a white light illumination effect.

[0137] Example 8

[0138] 1) The density is 0.12 g / cm³ 3 A 1.5cm diameter spherical balsa wood was placed in a modifier solution and boiled at 100℃. The modifier solution was a mixture of hydrogen peroxide and sodium hydroxide, with a mass ratio of hydrogen peroxide to sodium hydroxide of 10:2. The mixture was boiled until the balsa wood turned completely white. The wood was then removed and tested to find that the lignin content was 6.27%.

[0139] 2) Place the white balsa wood skeleton obtained in step 1) into acetone solvent to completely convert the water, then add polyvinylpyrrolidone and aluminate phosphor (Y3Al5O). 12 In a mixed liquid composed of Ce, aluminate phosphor (Y3Al5O) 12 Ce) accounts for 5% of the total mass of polyvinylpyrrolidone and aluminate phosphor; under vacuum conditions, polyvinylpyrrolidone with a refractive index of 1.50 and aluminate phosphor (Y3Al5O) are mixed. 12 Ce) is immersed in a balsa wood frame; the immersion time is 15 hours, and the amount of transparent resin and fluorescent powder applied is 55 wt.%.

[0140] 3) The balsa wood skeleton obtained in step 2) is placed in an oven and heated and dried to solidify at 50°C for 2 hours to obtain a balsa wood laser scatterer. This scatterer is then irradiated with a laser with a wavelength of 532nm. The highly concentrated laser light is uniformly scattered into three-dimensional space to achieve the lighting effect.

[0141] like Figure 18 The image shows the effect of white light emitted when a 532nm green laser irradiates polyvinylpyrrolidone-impregnated spherical wood in Example 8. The image demonstrates that when the wood scatterer is irradiated with a green laser, the laser light can penetrate the nitride phosphor / Y3Al5O3 scattering medium. 12 The laser scatterer of Ce mixes inside and emits white light, thus achieving a white light illumination effect.

[0142] Example 9

[0143] 1) The density is 0.12 g / cm³ 3 A 1.5cm diameter balsa wood ball was placed in a modifier solution and boiled at 100℃. The modifier solution was a mixture of hydrogen peroxide and sodium hydroxide, with a mass ratio of hydrogen peroxide to sodium hydroxide of 10:1.5. The mixture was boiled until the balsa wood turned completely white. The balsa wood was then removed and tested to find that the lignin content was 8.06%.

[0144] 2) Place the white balsa wood skeleton obtained in step 1) into acetone solvent to completely convert the water, and then place it into a mixed liquid composed of polydimethylsiloxane and aluminate phosphor (LaSr2AlO5), with the aluminate phosphor (LaSr2AlO5) accounting for 30% of the total mass of polydimethylsiloxane and aluminate phosphor; immerse the polydimethylsiloxane and phosphor with a refractive index of 1.40 into the balsa wood skeleton under vacuum conditions; the immersion time is 3 days, and the amount of transparent resin and phosphor applied is 35 wt.%.

[0145] 3) Place the balsa wood skeleton obtained in step 2) in an oven for curing at 100°C for 30 minutes to obtain a balsa wood laser scatterer.

[0146] 4) The scatterer is irradiated with a laser with a wavelength of 532nm. The highly concentrated laser is uniformly scattered into three-dimensional space to achieve the lighting effect.

[0147] like Figure 19 The image shown is an illustration of the white light emitted when 532nm green laser light is used to irradiate polydimethylsiloxane-impregnated spherical wood in Example 9. The image demonstrates that when the wood scatterer is irradiated with a green laser, the laser light mixes within the laser scatterer containing nitride phosphor / LaSr2AlO5, emitting white light and achieving a white light illumination effect. This indicates that laser scatterers can also be prepared by modifying lignin and combining it with phosphor.

[0148] Example 10

[0149] 1) The density is 0.12 g / cm³ 3 A 1.5cm diameter spherical balsa wood was placed in a modifier solution and boiled at 100℃. The modifier solution was a mixture of hydrogen peroxide and potassium hydroxide, with a mass ratio of hydrogen peroxide to potassium hydroxide of 10:3. The mixture was boiled until the balsa wood turned completely white. The wood was then removed and tested to find that the lignin content was 3.14%.

[0150] 2) Place the white balsa wood skeleton obtained in step 1) into acetone solvent to completely convert the water, and then place it into a mixed liquid composed of polyethylene glycol and aluminate phosphor (BaAl2O4), with the aluminate phosphor (BaAl2O4) accounting for 50% of the total mass of polyethylene glycol and aluminate phosphor; immerse the balsa wood skeleton with polyethylene glycol and aluminate phosphor (BaAl2O4) with a refractive index of 1.28 under vacuum conditions; the immersion time is 20 days, and the amount of transparent resin and phosphor applied is 55 wt.%.

[0151] 3) Place the balsa wood frame obtained in step 2) under a UV lamp for photocuring. The power of the UV lamp is 200W / cm². 2 The illumination time was 40 seconds, thus obtaining a balsa wood laser scattering body;

[0152] 4) The nitride phosphor (BaAl2O4), polymethyl methacrylate and epoxy resin binder are stirred evenly and coated on the inner surface of the spherical lampshade substrate to obtain a lampshade containing phosphor. The mass ratio of nitride phosphor (BaAl2O4), polymethyl methacrylate binder and epoxy resin lampshade substrate is 1:0.5:0.5.

[0153] 5) Fix the laser scatterer with controllable particle size obtained in step 3) inside the lampshade containing phosphor prepared in step 4), and irradiate the scatterer with a laser with a wavelength of 532nm. The highly concentrated laser is uniformly scattered into three-dimensional space to achieve the lighting effect.

[0154] like Figure 20 The image shows the white light emitted when 638nm red laser, 532nm green laser, and 450nm blue laser simultaneously irradiate polyethylene glycol-impregnated spherical wood in Example 10. The image demonstrates that when red, green, and blue lasers are used to simultaneously irradiate the wood scatterer, the laser light can penetrate the nitride phosphor / Y3Al5O3 scattering medium. 12 The laser scatterer of Ce mixes inside, and when the mixed laser shines on the lampshade, the outer surface of the lampshade emits white light, achieving a white light illumination effect.

[0155] Example 11

[0156] 1) The density is 0.12 g / cm³ 3 A 1.5cm diameter spherical balsa wood was placed in a modifier solution and boiled at 100℃. The modifier solution was a mixture of hydrogen peroxide and potassium hydroxide, with a mass ratio of hydrogen peroxide to potassium hydroxide of 10:1. The mixture was boiled until the balsa wood turned completely white. The wood was then removed and tested to find that the lignin content was 2.95%.

[0157] 2) Place the white balsa wood skeleton obtained in step 1) into acetone solvent to completely convert the water, and then place it into a mixed liquid composed of dimethyldimethoxysilane and aluminate phosphor (SrAl2O4), with the aluminate phosphor (SrAl2O4) accounting for 70% of the total mass of dimethyldimethoxysilane and aluminate phosphor; under vacuum conditions, immerse the balsa wood skeleton with dimethyldimethoxysilane and aluminate phosphor (SrAl2O4) with a refractive index of 1.36; the immersion time is 10 days, and the amount of transparent resin and phosphor applied is 35 wt.%;

[0158] 3) Place the balsa wood skeleton obtained in step 2) in an oven for heat curing at 80°C for 30 minutes to obtain a balsa wood laser scattering body.

[0159] 4) The nitride fluorescent powder (CaAlSiN3), polymethyl methacrylate and epoxy resin are stirred evenly and coated on the inner surface of the lampshade substrate to obtain a lampshade containing fluorescent powder. The mass ratio of nitride fluorescent powder (CaAlSiN3), polymethyl methacrylate and epoxy resin binder and epoxy resin lampshade substrate is 1:0.5:0.5.

[0160] 5) Fix the laser scatterer with controllable particle size obtained in step 3) inside the lampshade containing phosphor prepared in step (4), and irradiate the scatterer with 638nm red laser, 532nm green laser and 450nm blue laser. The highly concentrated laser is uniformly scattered into three-dimensional space to achieve white light illumination effect.

[0161] like Figure 21 The image shows the effect of white light emitted when 638nm red laser, 532nm green laser and 450nm blue laser simultaneously irradiate dimethyldimethoxysilane-impregnated spherical wood in Example 11. As can be seen from the image, when red laser, green laser and blue laser are used to irradiate the wood scatterer at the same time, the laser can mix inside the laser scatterer containing nitride phosphor / CaAlSiN3. When the mixed laser irradiates the lampshade, the outer surface of the lampshade emits white light, which achieves the white light illumination effect.

[0162] The wood-based laser scattering illumination material of this invention is achieved through two steps: scattering material preparation and laser irradiation emission. The scattering material can be prepared by two methods: the first method involves impregnating the lignin-free wood or lignin-free chromophore wood with a refractive index mismatched with that of nanocellulose into its internal porous structure; the second method involves simultaneously impregnating the lignin-free wood or lignin-free chromophore wood with a transparent resin and a fluorescent material into its internal porous structure, followed by photocuring or thermocuring. Laser irradiation emission can be achieved by two methods: the first method involves irradiating the wood-based laser scattering material with a laser source of a selected wavelength, thereby scattering the laser source into a three-dimensionally uniform light source; the second method involves combining the wood-based laser scattering material with a cover containing fluorescent material. This wood-based laser scattering illumination material of the present invention features a simple preparation process, mild reaction conditions, good mechanical properties, and water resistance, and can be applied in fields such as seabed lighting, underwater lighting, indoor lighting, outdoor lighting, long-distance non-contact lighting, and adjustable light color lighting.

[0163] In addition, the inventors of this invention have also used other raw materials and process conditions listed in this specification, and with reference to the embodiments, to prepare a series of wood-based laser scatterer lighting materials and laser fluorescent lighting devices. Testing revealed that these laser scatterers also possess the excellent properties described in this specification.

[0164] The wood-based laser scatterer of the present invention has excellent laser scattering performance, the required preparation equipment is simple to operate, and continuous and automated production can be realized, which greatly shortens the preparation cycle and reduces costs, and has great application prospects.

[0165] Laser lighting devices are manufactured by combining a laser scatterer and an outer casing, which has advantages such as good luminous performance, simple manufacturing, and low cost.

[0166] It should be understood that the above descriptions are only some embodiments of the present invention. It should be noted that those skilled in the art can make other modifications and improvements without departing from the inventive concept of the present invention, and these all fall within the protection scope of the present invention.

Claims

1. A wood-based laser scatterer, characterized in that: It is composed of wood with lignin removed or wood with lignin chromophores removed and a transparent resin whose refractive index is mismatched with that of wood nanocellulose in the internal pore structure; it is made by UV curing or heat curing; or, it is composed of wood with lignin removed or wood with lignin chromophores removed, a transparent resin whose refractive index is mismatched with that of wood nanocellulose in the internal pore structure and a fluorescent material, and then made by photocuring or heat curing.

2. The wood-based laser scatterer according to claim 1, characterized in that: The refractive index of the transparent resin that does not match the refractive index of wood nanocellulose is <0.50 or >0.50; the transparent resin that does not match the refractive index of wood nanocellulose is one or more of polyethylene glycol diacrylate, epoxy acrylate, acrylate derivatives, polyurethane prepolymer, polyurethane modified epoxy resin, polyvinylpyrrolidone, polyethylene glycol, polydimethylsiloxane, tetramethyl orthosilicate, tetraethyl orthosilicate, methyltrimethoxysilane, methyltriethoxysilane, dimethyldimethoxysilane, dimethyldiethoxysilane, and silicone rubber.

3. The wood-based laser scatterer according to claim 1, characterized in that: The fluorescent material includes any one or a combination of two or more of the following: aluminate fluorescent materials, silicate fluorescent materials, nitride fluorescent materials, phosphate fluorescent materials, and sulfide fluorescent materials doped with rare earth elements; the particle size of the fluorescent material is 0.1 to 100 μm, and it is capable of scattering and converting laser light sources in the wavelength range of 400 to 800 nm into a three-dimensional uniform illumination source.

4. The wood-based laser scatterer according to claim 1, characterized in that: In the lignin-free wood or lignin-free chromophore wood, the amount of transparent resin with a refractive index that does not match that of wood nanocellulose is 5-95 wt.%; the fluorescent material and the transparent resin with a refractive index that does not match that of wood nanocellulose are uniformly mixed together, and the fluorescent material accounts for 1-80% of the total mass of the fluorescent material and the transparent resin with a refractive index that does not match that of wood nanocellulose.

5. The wood-based laser scatterer according to claim 1, characterized in that: In the aforementioned wood-based laser scatterer, the lignin-free wood refers to wood with a lignin content ≤10% by mass; the lignin-free chromophores are wood with a carbonyl, carboxyl, aldehyde, and ester functional groups in the lignin containing ≤10% by mass; the wood used is any one of balsa wood, paulownia, fir, poplar, ash, and pine; the density of the wood is 0.02 g / cm³. 3 -1.35g / cm 3 between.

6. The wood-based laser scatterer according to claim 1, characterized in that: The morphology of the wood-based laser scatterer includes any one or a combination of two or more of the following: sphere, cylinder, ellipsoid, cube, cuboid, and cone; the diameter of the wood laser scatterer is between 5 mm and 100 mm; and the density of the wood laser scatterer is 0.10–1.50 g / cm³. 3 .

7. The method for preparing a wood-based laser scatterer according to any one of claims 1-6, characterized in that... Includes the following steps: (1) Place the wood in a lignin extraction solution or a lignin modifier solution and heat it to 100°C until the wood turns completely white. (2) The white wood block obtained in step (1) is placed in acetone, ethanol and / or methanol organic solvents for solvent replacement to obtain a white wood block containing organic solvents; (3) Place the white wood block containing organic solvent obtained in step (2) into a transparent resin whose refractive index does not match that of wood nanocellulose, place it under vacuum conditions or in a natural environment, immerse the white wood block in the transparent resin whose refractive index does not match that of wood nanocellulose, and cure it with ultraviolet light or heat to obtain a wood laser scatterer. Alternatively, it may include the following steps: 1) Place the wood in a lignin extraction solution or a lignin modifier solution and heat it to 100°C until the wood turns completely white; 2) Place the white wood block obtained in step 1) into an organic solvent such as acetone, ethanol and / or methanol for solvent exchange to obtain a white wood block containing organic solvent; 3) Mix the fluorescent material with a transparent resin whose refractive index does not match that of wood nanocellulose. Place the white wood block containing organic solvent obtained in step 2) into the mixture and place it under vacuum or in a natural environment. Then, cure it with ultraviolet light or heat to obtain a wood laser scatterer.

8. The method for preparing a wood-based laser scatterer according to claim 7, characterized in that: The lignin removal solution refers to sodium chlorite or sodium hypochlorite, or a mixture of both, with a solute mass fraction concentration of 0.1-20%, and the pH of the aqueous solution is adjusted to 4-5 using acetic acid; the lignin modifier solution refers to a mixture comprising hydrogen peroxide and an alkaline substance, wherein the mass ratio of hydrogen peroxide to the alkaline substance is 10:0.1 to 10:3; the alkaline substance is sodium hydroxide or potassium hydroxide, or a mixture of both; the white wood block is soaked in an organic solvent until the water in the white wood block is completely converted into the organic solvent; the fluorescent material accounts for 1-80% of the total mass of the fluorescent material and the transparent resin whose refractive index does not match that of the wood nanocellulose.

9. The application of the wood-based laser scatterer according to any one of claims 1-6 in the preparation of laser lighting materials, wherein the laser lighting materials include lighting materials used in the fields of seabed lighting, underwater lighting, indoor lighting, outdoor lighting, long-distance non-contact lighting, adjustable light color lighting, laser scattering, and laser display.

10. The application of the wood-based laser scatterer according to claim 9 in the preparation of laser lighting materials, characterized in that: The laser irradiation method for a wood-based laser scatterer includes the following steps: irradiating the wood-based laser scatterer with a laser light source of a selected wavelength, causing the laser light source to scatter into a three-dimensional uniform light source; or, using the wood-based laser scatterer and a cover containing fluorescent material together as illumination materials, placing the wood-based laser scatterer inside the cover containing fluorescent material, the cover containing fluorescent material consisting of a substrate and fluorescent material coated on its surface, irradiating the wood laser scatterer inside the cover with a laser light source of a selected wavelength, the scattered laser light passing through the cover becoming a three-dimensional uniform light source; the wavelength of the laser light source is 400–800 nm.

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