Fluorescence conversion structure in plano-convex lens shape and near-infrared detection source assembly

Abstract

The utility model discloses a plano-convex lens shaped fluorescence conversion structure and near-infrared detection source component, including near-infrared fluorescent ceramic main body, the longitudinal section of near-infrared fluorescent ceramic main body is trapezoidal surface, the near-infrared fluorescent ceramic main body is provided with near-infrared fluorescent film, the longitudinal section of which is convex arc surface. The longitudinal section of the near-infrared fluorescent ceramic main body is a trapezoidal surface, the near-infrared fluorescent film with the longitudinal section being a convex arc surface is arranged on the near-infrared fluorescent ceramic main body, and the near-infrared fluorescent film with the convex arc surface is adhered to the near-infrared fluorescent ceramic main body with the longitudinal section being the trapezoidal surface to form a fluorescence conversion structure in a plano-convex lens shape. Light rays are converged by the plano-convex-lens-shaped fluorescence conversion structure in the light ray propagation process, light ray divergence is relatively reduced, the brightness of near-infrared light is effectively improved, and the technical problems that in the light ray propagation process in the prior art, light ray divergence is much, and the brightness and intensity of the near-infrared light are not enough and need to be improved are solved.

Description

Technical Field

[0001] The utility model relates to the technical field of laser lighting, in particular to a fluorescence conversion structure in the shape of a plano-convex lens and a near-infrared detection source component. Background Art

[0002] Near-infrared detection technology is widely used in many fields, such as medical diagnosis, night vision imaging, fiber optic communications, etc. Traditional near-infrared detection systems usually use expensive InGaAs detectors, which are complex in structure and high in cost. In recent years, with the development of new semiconductor materials, some alternative detection solutions based on silicon and perovskite have emerged, which have the advantages of low cost and high integration. For example, the invention patent with application publication number CN118360056A uses Cr 3+ ions as activators, using Cr in the luminescent material 3+ The ions act as luminescent centers in the phosphor matrix, generating near-infrared red light. The proposed near-infrared luminescent material, when excited by 450nm blue light, emits near-infrared red light with a wavelength range of 680-1100nm, making it suitable for blue LED chips.

[0003] At the same time, due to the problem of low luminous efficiency in the LED excitation luminescent material method, the near-infrared detection system also needs to be equipped with a corresponding high-efficiency light source to achieve effective illumination of the target object. Therefore, near-infrared detection equipment based on lasers has been widely studied. These new light sources not only have higher luminous efficiency and spectral adaptability, but also can achieve more compact integration and flexible regulation, providing new technical support for building high-performance near-infrared detection lighting systems. Among them, near-infrared light LD detection based on blue excitation light source plus phosphor is one of the most mainstream technical routes. At present, most commercial LD near-infrared light detection products use GdYAG:Cr 3+ Phosphor is used as luminescent material by GdYAG:Cr 3+ Phosphors are combined with blue light LD to achieve near-infrared light emission. Although this solution is relatively mature in technology and the manufacturing process is controllable, there are still some problems that need to be solved: ① Red light is missing: GdYAG:Cr 3+ Phosphors primarily emit yellow light, and the near-infrared light generated by the blue laser produces a "cold white" hue. This lacks sufficient red light components, resulting in poor color rendering and making it difficult to meet requirements. Secondly, the excitation method with both sides being planar has the problem of a high degree of light source dispersion.

[0004] Therefore, in the actual use of the near-infrared light emitting device made of the above-mentioned fluorescent conversion composite layer, the light diverges more during the propagation process, resulting in the near-infrared light brightness and intensity being insufficient and needing to be improved. How to reduce the divergence of light, converge the light, and increase the intensity of near-infrared light is a technical problem that needs to be solved. Utility Model Content

[0005] In response to the deficiencies in the above-mentioned background technology, the present invention proposes a fluorescence conversion structure and near-infrared detection source assembly in the shape of a plano-convex lens, which solves the technical problems in the prior art that light diverges a lot during light propagation, and the near-infrared light brightness and intensity are insufficient and need to be improved.

[0006] The technical solution of the present utility model is implemented as follows: a fluorescence conversion structure in the shape of a plano-convex lens includes a near-infrared fluorescent ceramic body, the longitudinal section of the near-infrared fluorescent ceramic body is a trapezoidal surface, and the near-infrared fluorescent ceramic body is provided with a near-infrared fluorescent film with a longitudinal section as a convex arc surface.

[0007] Preferably, the near-infrared fluorescent ceramic body is GdYAG:Cr 3+ Near-infrared fluorescent ceramics.

[0008] Preferably, the near-infrared fluorescent film is LuGdYAG:Cr 3+ ,Yb 3+ Glass film.

[0009] Preferably, the mass ratio of the glass powder to the phosphor in the near-infrared fluorescent film is A, and A is 5:1-9:1.

[0010] Preferably, the thickness of the near-infrared fluorescent film is B, and B is 50 μm-100 μm.

[0011] Preferably, the ratio of the area of the near-infrared fluorescent film to the area of the near-infrared fluorescent ceramic body is C, and C is 50%-100%.

[0012] Preferably, the particle size of the raw materials of the near-infrared fluorescent ceramic body and the near-infrared fluorescent film are both 250 nm-300 nm.

[0013] A near-infrared detection source assembly includes an excitation source and the above-mentioned plano-convex lens-shaped fluorescence conversion structure, wherein the excitation source is a blue laser, and the near-infrared fluorescent film is provided at one end of the near-infrared fluorescent ceramic body away from the excitation source.

[0014] Preferably, the incident area of the excitation source is larger than the area of the near-infrared fluorescent film and smaller than the area of the near-infrared fluorescent ceramic body.

[0015] Preferably, the emission wavelength of the excitation source is 700 nm to 830 nm.

[0016] The beneficial effects of the present invention are as follows: the longitudinal cross-section of the near-infrared fluorescent ceramic body of the present invention is a trapezoidal surface, and a near-infrared fluorescent film with a convex arc surface in the longitudinal cross-section is arranged on the near-infrared fluorescent ceramic body. The near-infrared fluorescent film with a convex arc surface is bonded to the infrared fluorescent ceramic body with a trapezoidal surface in the longitudinal cross-section to form a fluorescence conversion structure in the shape of a plano-convex lens. During the propagation of light, the light is converged by the fluorescence conversion structure in the shape of a plano-convex lens, the divergence of light is relatively reduced, and the brightness of the near-infrared light is effectively improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0018] Figure 1 This is a schematic diagram of the case where the ratio of the area of the near-infrared fluorescent film to the area of the near-infrared fluorescent ceramic body of the present invention is 25%.

[0019] Figure 2 This is a schematic diagram of the case where the ratio of the area of the near-infrared fluorescent film to the area of the near-infrared fluorescent ceramic body of the present invention is 50%.

[0020] Figure 3 This is a schematic diagram of the case where the ratio of the area of the near-infrared fluorescent film to the area of the near-infrared fluorescent ceramic body of the present invention is 75%.

[0021] Figure 4 for Figure 1 side view.

[0022] Figure 5 for Figure 2 side view.

[0023] Figure 6 for Figure 3 side view.

[0024] Figure 7 This is a schematic diagram of the near-infrared detection source component of the present utility model.

[0025] In the figure, 1 is a near-infrared fluorescent ceramic body, 2 is a near-infrared fluorescent film, and 3 is an excitation source. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0027] Example 1, a fluorescent conversion structure in the shape of a plano-convex lens, such as Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 、 Figure 5 ,and Figure 6 As shown, the device comprises a near-infrared fluorescent ceramic body 1 having a trapezoidal longitudinal cross-section, and a near-infrared fluorescent film 2 having a convex arc longitudinal cross-section disposed thereon. The near-infrared fluorescent ceramic body 1 has a trapezoidal longitudinal cross-section, and the near-infrared fluorescent film 2 having a convex arc longitudinal cross-section is disposed thereon. The convex arc near-infrared fluorescent film 2 is bonded to the near-infrared fluorescent ceramic body 1 having a trapezoidal longitudinal cross-section, forming a plano-convex lens-shaped fluorescence conversion structure. During light propagation, the light is converged by the plano-convex lens-shaped fluorescence conversion structure, which relatively reduces light divergence and effectively improves the brightness of the near-infrared light. This solves the technical problem in the prior art of relatively large light divergence during light propagation, insufficient near-infrared light brightness, and insufficient intensity, which needs to be improved.

[0028] The near-infrared fluorescent film layer 2 serves as a light-emitting unit to supplement the red light in the main structure, and at the same time absorbs the light intensity of the blue laser main beam, thereby solving the problems of low color rendering index, high relative color temperature and yellow ring when fluorescent materials are used in laser lighting.

[0029] Example 2, based on Example 1, a fluorescent conversion structure in the shape of a plano-convex lens, such as Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 、 Figure 5 ,and Figure 6 As shown, the near-infrared fluorescent ceramic body 1 is GdYAG:Cr 3+ Fluorescent ceramics. The near-infrared fluorescent ceramic body 1 is selected to be GdYAG:Cr 3+ Fluorescent ceramics are due to GdYAG:Cr 3+ The fluorescent ceramic serves as a light-emitting unit to supplement the yellow light, and also as a heat dissipation substrate layer due to its good thermal conductivity.

[0030] Example 3, based on Example 2, a fluorescent conversion structure in the shape of a plano-convex lens, such as Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 、 Figure 5 ,and Figure 6 As shown, the near-infrared fluorescent film 2 is LuGdYAG:Cr 3+ ,Yb 3+ Glass film. Near-infrared fluorescent film 2 is selected as LuGdYAG:Cr 3+ ,Yb 3+ The glass film material is LuGdYAG:Cr 3+ ,Yb 3+ Glass film bonded to GdYAG:Cr 3+ After the fluorescent ceramics are applied, compared with the GdYAG:Cr 3+ For bonding other layered structures on fluorescent ceramics, it effectively reduces the 3+ The influence of thermal conductivity of fluorescent ceramics, the LuGdYAG:Cr 3+ ,Yb 3+ Glass film of GdYAG:Cr 3+ The thermal conductivity of fluorescent ceramics is less affected.

[0031] Example 4, based on Example 3, a fluorescence conversion structure in the shape of a plano-convex lens, such as Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 、 Figure 5 ,and Figure 6 As shown, the mass ratio of the glass powder to the phosphor in the near-infrared fluorescent film 2 is A, and A is 5:1-9:1. The mass ratio A of the glass powder to the phosphor in the near-infrared fluorescent film 2 affects the color rendering index of the near-infrared fluorescent film 2. The corresponding display index can be adjusted by adjusting the specific value of the mass ratio A.

[0032] Example 5, based on Example 4, a fluorescence conversion structure in the shape of a plano-convex lens, such as Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 、 Figure 5 ,and Figure 6 As shown, the thickness of the near-infrared fluorescent film 2 is B, which is 50 μm-100 μm. The thickness B of the near-infrared fluorescent film 2 affects the GdYAG:Cr 3+ The thermal conductivity of fluorescent ceramics is the smaller the thickness B of the near-infrared fluorescent film 2 is, the better the thermal conductivity of GdYAG:Cr 3+The smaller the impact of the thermal conductivity of the fluorescent ceramic, the smaller the impact of the thermal conductivity of the fluorescent ceramic. On the other hand, it affects the light transmittance of the near-infrared fluorescent film 2. The smaller the thickness B of the near-infrared fluorescent film 2, the better the light transmittance and the higher the quality of the near-infrared light.

[0033] Example 6, based on Example 5, a fluorescent conversion structure in the shape of a plano-convex lens, such as Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 、 Figure 5 ,and Figure 6 As shown, the ratio of the area of the near-infrared fluorescent film 2 to the area of the near-infrared fluorescent ceramic body 1 is C, and C is between 50% and 100%. The larger the ratio C of the near-infrared fluorescent film 2 to the area of the near-infrared fluorescent ceramic body 1, that is, the larger the area occupied by the near-infrared fluorescent film 2, the warmer the hue of the near-infrared light obtained. By changing the value of the area ratio C, multiple groups of near-infrared lamps with different hues can be obtained, thereby expanding the applicability of the plano-convex lens-shaped fluorescence conversion structure.

[0034] in Figure 1 1 is a schematic diagram of the utility model when the ratio of the area of the near-infrared fluorescent film to the area of the near-infrared fluorescent ceramic body is 25%; 2 is a schematic diagram of the utility model when the ratio of the area of the near-infrared fluorescent film to the area of the near-infrared fluorescent ceramic body is 50%; 3 is a schematic diagram of the utility model when the ratio of the area of the near-infrared fluorescent film to the area of the near-infrared fluorescent ceramic body is 75%. Figure 4 、 Figure 5 and Figure 6 They are Figure 1 、 Figure 2 and Figure 3 The larger the ratio C of the area of the near-infrared fluorescent film 2 to the area of the near-infrared fluorescent ceramic body 1 is, that is, the larger the area occupied by the near-infrared fluorescent film 2 is, the warmer the hue of the obtained near-infrared light is.

[0035] Example 7, based on Example 1 or 6, a fluorescent conversion structure in the shape of a plano-convex lens, such as Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 、 Figure 5 ,and Figure 6As shown, the raw material particle size of the near-infrared fluorescent ceramic body 1 and the near-infrared fluorescent film 2 is both 250 nm-300 nm. Preferably, the raw material particle size of the near-infrared fluorescent ceramic body 1 and the near-infrared fluorescent film 2 is both 300 nm. When the particle size is 300 nm, the near-infrared fluorescent film 2 can reduce the pores within the film and the pores within the near-infrared fluorescent ceramic body 1, which is conducive to the near-infrared fluorescent film 2 emitting red light and the near-infrared fluorescent ceramic body 1 transmitting yellow light, thereby improving the quality of the obtained near-infrared light.

[0036] When implementing Example 7, taking the mass ratios of glass powder to phosphor powder as 5:1, 7:1, and 9:1 as examples, the specific steps for preparing a plano-convex lens-shaped fluorescence conversion structure are:

[0037] When the mass ratio between glass powder and phosphor powder is set to 5:1:

[0038] (1) First, prepare the fluorescent ceramic body:

[0039] The required raw material powders were accurately weighed on an analytical balance according to the stoichiometric formula. The powder raw materials used were Gd2O3, Y2O 3， Cr2O3 and Al2O3, all powders used in total are 50g. Subsequently, each powder raw material is placed in a ball mill for mixing, and then sintering aids tetraethyl silicate and MgF2 are added to start ball milling. The ball mill speed is set to 300r / min, the ball milling time is set to 12h, and the ball milling beads and ball milling media are high-purity Al2O3 balls and alcohol, respectively. Next, the slurry obtained after ball milling is placed in an evaporating dish, and then the evaporating dish is placed in an oven for drying, wherein the temperature is set to 80℃ and the drying time is set to 24h. Finally, the dried powder is passed through a 100-mesh sieve to obtain the fluorescent ceramic main powder. Next, the mixed raw material powder in the previous step is placed in a stainless steel mold with a diameter of 18mm, and then the tablet press pressure is set to 25Mpa and the pressure is maintained for 10min. After the pressure is maintained, a blank is obtained. The blank obtained after dry pressing is then cold isostatically pressed, with the pressure set to 250Mpa and the pressure maintained for 400s. After obtaining the green body, it is calcined to remove impurities, with the temperature set at 950°C and the calcination time set to 10 hours. The next step is to sinter the green body of the fluorescent ceramic body: the green body obtained in the previous step is sintered using a vacuum sintering method, with the sintering heating rate set to 3 / min, the cooling rate set to 10 / min, and the sintering time set to 12 hours. The final step is to polish the fluorescent ceramic body: the green body obtained in the previous step is cut into cylindrical slices with a thickness of 0.5mm, and the cut cylindrical slices are double-sided polished.

[0040] (2) Preparation of slurry required for near-infrared fluorescent film:

[0041] First, the first step is to prepare the precursor glass powder of the near-infrared fluorescent film: 38SiO2-40B2O3-4ZnO-4Na2O-3Al2O3-1Li2O (mol%) precursor glass is prepared by high-temperature melting and rapid cooling method. The raw materials are weighed according to the stoichiometric ratio and ground evenly. The ground powder is placed in a crucible and sintered at 1300°C for 2 hours. The molten liquid is then poured into a copper mold and cooled to obtain a precursor glass block. Finally, the glass block is ground into powder and passed through a 100-mesh sieve. The next step is to prepare the near-infrared fluorescent film slurry: the precursor glass powder obtained in the previous step is mixed with commercial LuGdYAG:Cr 3+ ,Yb 3+ The phosphor powders were mixed, wherein the mass ratio between the glass powder and the phosphor powder was set to 5:1, and the total weight of the two powders was 1 g. Then 1 ml of terpineol, 1 ml of ethyl acetate, and 0.2 g of ethyl cellulose were added and mixed to obtain the slurry required for the near-infrared fluorescent film.

[0042] (3) Coating combination of near-infrared fluorescent film and fluorescent ceramic body:

[0043] The first step is to fix the fluorescent ceramic main body thin sheet on the glass coating platform, and then level the adjustable wet film preparation device high-precision scraper. After leveling, the scraper height is raised to 0.5mm, and then the scraper height is adjusted from 0.5mm to 50μm. After the scraper height is set, the longitudinal width of the film is designed to be 10mm. Then, the slurry prepared in step (2) is first dipped on one end of the ceramic main body, and then the set scraper is scraped from one end to the entire fluorescent ceramic. From then on, the near-infrared fluorescent film and the fluorescent ceramic main body are combined.

[0044] (4) Sintering the coated and bonded device:

[0045] The device obtained in step (3) was sintered at 300° C. in an argon atmosphere for 30 minutes, and then cooled to room temperature to obtain a frustum-like structure fluorescent material.

[0046] (5) The obtained composite structure fluorescent ceramic emits light with a wavelength of 700 nm to 820 nm under the excitation of 455 nm blue laser. The obtained light source shows broadband emission centered at about 762 nm with a FWHM (full width at half maximum) of 112 nm. The temperature of the device is measured to be 74.1 °C after being excited for 1 minute.

[0047] When the mass ratio between glass powder and phosphor powder is set to 7:1:

[0048] (1) First, prepare the fluorescent ceramic body:

[0049] The required raw material powders were accurately weighed on an analytical balance according to the stoichiometric formula. CeO₂, Y₂O₃, and Al₂O₃ were used, with a total of 50g of powder used. The individual powders were then mixed in a ball mill, followed by the addition of sintering aids tetraethyl silicate and MgF₂, and ball milling. The milling speed was set to 300 r / min, the milling time was set to 12 hours, and the milling beads and milling media were high-purity Al₂O₃ balls and alcohol, respectively. The resulting slurry was then placed in an evaporating dish and dried in an oven at 80°C for 24 hours. The dried powder was then screened through a 100-mesh sieve to obtain the fluorescent ceramic body powder. The mixed raw material powders from the previous step were then placed in an 18mm diameter stainless steel mold. The tablet press was then set to 25 MPa and maintained under pressure for 10 minutes to produce a green body. The green billet obtained after dry pressing is then subjected to cold isostatic pressing, with the pressure set to 250Mpa and the holding time being 400s. After obtaining the green billet, it is calcined to remove impurities, wherein the temperature is set to 950°C and the calcination time is set to 10h. The next step is to sinter the green billet of the fluorescent ceramic main body: the vacuum sintering method is used to sinter the green billet obtained in the previous step, wherein the sintering heating rate is set to 3 / min, the cooling rate is set to 10 / min, and the sintering time is 12h. The last step is to polish the fluorescent ceramic main body: the green billet obtained by sintering in the previous step is cut into cylindrical slices with a thickness of 0.5mm, and the cut cylindrical slices are double-sided polished.

[0050] (2) Preparation of slurry required for near-infrared fluorescent film:

[0051] First, the first step is to prepare the precursor glass powder of the near-infrared fluorescent film: 38SiO2-40B2O3-4ZnO-4Na2O-3Al2O3-1Li2O (mol%) precursor glass is prepared by high-temperature melting and rapid cooling method. The raw materials are weighed according to the stoichiometric ratio and ground evenly. The ground powder is placed in a crucible and sintered at 1300°C for 2 hours. The molten liquid is then poured into a copper mold and cooled to obtain a precursor glass block. Finally, the glass block is ground into powder and passed through a 100-mesh sieve. The next step is to prepare the near-infrared fluorescent film slurry: the precursor glass powder obtained in the previous step is mixed with commercial LuGdYAG:Cr 3+ ,Yb 3+ The phosphor powders were mixed, wherein the mass ratio between the glass powder and the phosphor powder was set to 7:1, and the total weight of the two powders was 1 g. Then 1 ml of terpineol, 1 ml of ethyl acetate, and 0.2 g of ethyl cellulose were added and mixed to obtain the slurry required for the near-infrared fluorescent film.

[0052] (3) Coating combination of near-infrared fluorescent film and fluorescent ceramic body:

[0053] The first step is to fix the fluorescent ceramic main body thin sheet on the glass coating platform, and then level the adjustable wet film preparation device high-precision scraper. After leveling, the scraper height is raised to 0.5mm, and then the scraper height is adjusted from 0.5mm to 50μm. After the scraper height is set, the longitudinal width of the film is designed to be 10mm. Then, the slurry prepared in step (2) is first dipped on one end of the ceramic main body, and then the set scraper is scraped from one end to the entire fluorescent ceramic. From then on, the near-infrared fluorescent film and the fluorescent ceramic main body are combined.

[0054] (4) Sintering the coated and bonded device:

[0055] The device obtained in step (3) was sintered at 300° C. in an argon atmosphere for 30 minutes, and then cooled to room temperature to obtain a frustum-like structure fluorescent material.

[0056] (5) The obtained composite structure fluorescent ceramic emits light with a wavelength of 710 nm to 820 nm under the excitation of 455 nm blue laser. The obtained light source shows broadband emission centered at about 770 nm with a FWHM (full width at half maximum) of 110 nm. The temperature of the device is measured to be 79.3 °C after being excited for 1 minute.

[0057] When the mass ratio between glass powder and phosphor powder is set to 9:1:

[0058] (1) First, prepare the fluorescent ceramic body:

[0059] The required raw material powders were accurately weighed on an analytical balance according to the stoichiometric formula. CeO₂, Y₂O₃, and Al₂O₃ were used, with a total of 50g of powder used. The individual powders were then mixed in a ball mill, followed by the addition of sintering aids tetraethyl silicate and MgF₂, and ball milling. The milling speed was set to 300 r / min, the milling time was set to 12 hours, and the milling beads and milling media were high-purity Al₂O₃ balls and alcohol, respectively. The resulting slurry was then placed in an evaporating dish and dried in an oven at 80°C for 24 hours. The dried powder was then screened through a 100-mesh sieve to obtain the fluorescent ceramic body powder. The mixed raw material powders from the previous step were then placed in an 18mm diameter stainless steel mold. The tablet press was then set to 25 MPa and maintained under pressure for 10 minutes to produce a green body. The green billet obtained after dry pressing is then subjected to cold isostatic pressing, with the pressure set to 250Mpa and the holding time being 400s. After obtaining the green billet, it is calcined to remove impurities, wherein the temperature is set to 950°C and the calcination time is set to 10h. The next step is to sinter the green billet of the fluorescent ceramic main body: the vacuum sintering method is used to sinter the green billet obtained in the previous step, wherein the sintering heating rate is set to 3 / min, the cooling rate is set to 10 / min, and the sintering time is 12h. The last step is to polish the fluorescent ceramic main body: the green billet obtained by sintering in the previous step is cut into cylindrical slices with a thickness of 0.5mm, and the cut cylindrical slices are double-sided polished.

[0060] (2) Preparation of slurry required for near-infrared fluorescent film:

[0061] First, the first step is to prepare the precursor glass powder of the near-infrared fluorescent film: 38SiO2-40B2O3-4ZnO-4Na2O-3Al2O3-1Li2O (mol%) precursor glass is prepared by high-temperature melting and rapid cooling method. The raw materials are weighed according to the stoichiometric ratio and ground evenly. The ground powder is placed in a crucible and sintered at 1300°C for 2 hours. The molten liquid is then poured into a copper mold and cooled to obtain a precursor glass block. Finally, the glass block is ground into powder and passed through a 100-mesh sieve. The next step is to prepare the near-infrared fluorescent film slurry: the precursor glass powder obtained in the previous step is mixed with commercial LuGdYAG:Cr 3+ ,Yb 3+ The phosphor powders were mixed, wherein the mass ratio between the glass powder and the phosphor powder was set to 9:1, and the total weight of the two powders was 1 g. Then 1 ml of terpineol, 1 ml of ethyl acetate, and 0.2 g of ethyl cellulose were added and mixed to obtain the slurry required for the near-infrared fluorescent film.

[0062] (3) Coating combination of near-infrared fluorescent film and fluorescent ceramic body:

[0063] The first step is to fix the fluorescent ceramic main body thin sheet on the glass coating platform, and then level the adjustable wet film preparation device high-precision scraper. After leveling, the scraper height is raised to 0.5mm, and then the scraper height is adjusted from 0.5mm to 50μm. After the scraper height is set, the longitudinal width of the film is designed to be 10mm. Then, the slurry prepared in step (2) is first dipped on one end of the ceramic main body, and then the set scraper is scraped from one end to the entire fluorescent ceramic. From then on, the near-infrared fluorescent film and the fluorescent ceramic main body are combined.

[0064] (4) Sintering the coated and bonded device:

[0065] The device obtained in step (3) was sintered at 300° C. in an argon atmosphere for 30 minutes, and then cooled to room temperature to obtain a frustum-like structure fluorescent material.

[0066] (5) The obtained composite structure fluorescent ceramic emits light with a wavelength of 715 nm to 830 nm under the excitation of 455 nm blue laser. The obtained light source shows broadband emission centered at about 780 nm with a FWHM (full width at half maximum) of 121 nm. The temperature of the device is measured to be 82 °C after being excited for 1 minute.

[0067] Example 8, based on any one of Examples 1 to 7, a near infrared detection source component, such as Figure 7 As shown, the device includes an excitation source 3 and the aforementioned plano-convex lens-shaped fluorescence conversion structure. The excitation source 3 is a blue laser, and the near-infrared fluorescent film 2 is disposed on the end of the near-infrared fluorescent ceramic body 1 away from the excitation source 3. The excitation source 3 is disposed on the lower bottom surface of the trapezoidal longitudinal cross-section of the near-infrared fluorescent ceramic body 1, and the near-infrared fluorescent film 2 is disposed on the upper bottom surface of the trapezoidal longitudinal cross-section of the near-infrared fluorescent ceramic body 1. The excitation source 3 is a blue laser because it provides a more uniform mixing of blue excitation light, red light, and yellow light.

[0068] Example 9, based on Example 8, a near infrared detection source component, such as Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 、 Figure 5 、 Figure 6 and Figure 7 As shown, the incident area of the excitation source 3 is larger than the area of the near-infrared fluorescent film 2 and smaller than the area of the near-infrared fluorescent ceramic body 1. This is set to ensure that the area of the near-infrared fluorescent ceramic body 1 is maximized, and the blue laser of the excitation source 3 excites the GdYAG:Cr 3+ When ceramics, GdYAG:Cr3+ The ceramic is excited by the blue laser and emits more yellow light, which is mixed into the near-infrared light to generate the benchmark, and then passes through the GdYAG:Cr 3+ The blue light of the ceramic, the red light and the yellow light emitted by the near-infrared fluorescent film 2 are mixed to form uniform near-infrared light.

[0069] Example 10, based on Example 9, a near infrared detection source component, such as Figure 7 As shown, the emission wavelength of the excitation source is 700nm to 830nm. When the emission wavelength of excitation source 2 is 700nm to 830nm, it is beneficial to excite the near-infrared fluorescent ceramic body 1 and the near-infrared fluorescent film 2, thereby improving the quality of the obtained near-infrared light. The resulting composite structure fluorescent ceramic emits light with a wavelength of 700nm to 830nm under 455nm blue laser excitation, thereby obtaining a light source.

[0070] When the embodiment 10 is implemented, when the blue laser of the excitation source 3 excites GdYAG:Cr 3+ When using ceramics, there are two kinds of light: one is GdYAG:Cr 3+ The yellow light emitted by the ceramic by the laser is due to the fact that part of the blue laser does not excite the GdYAG:Cr 3+ , directly transmitted out, the yellow light and the blue light are mixed to obtain near-infrared light. After the near-infrared fluorescent film 2 is adhered to the near-infrared fluorescent ceramic body 1, it is equivalent to adding red light to the near-infrared light, so that the blue laser produces warm-toned near-infrared light after passing through the fluorescent conversion structure in the shape of a plano-convex lens of this application.

[0071] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A plano-convex lens-shaped fluorescence conversion structure, comprising a near-infrared fluorescent ceramic body (1), characterized in that: The near-infrared fluorescent ceramic body (1) has a longitudinal section that is a trapezoidal surface, and a near-infrared fluorescent film (2) having a longitudinal section that is a convex arc surface is provided on the near-infrared fluorescent ceramic body (1); the near-infrared fluorescent ceramic body (1) is GdYAG:Cr 3+ Near-infrared fluorescent ceramic; the near-infrared fluorescent film (2) is LuGdYAG:Cr 3+ ,Yb 3+ Glass film.

2. The plano-convex lens-shaped fluorescence conversion structure according to claim 1, characterized in that: The thickness of the near-infrared fluorescent film (2) is B, and B is 50 μm-100 μm.

3. The plano-convex lens-shaped fluorescence conversion structure according to claim 2, characterized in that: The ratio of the area of the near-infrared fluorescent film (2) to the area of the near-infrared fluorescent ceramic body (1) is C, and C is 50%-100%.

4. A near-infrared detection source assembly, characterized in that: The invention comprises an excitation source (3) and a plano-convex lens-shaped fluorescence conversion structure according to any one of claims 1 to 3, wherein the excitation source (3) is a blue laser, and the near-infrared fluorescent film (2) is provided at one end of the near-infrared fluorescent ceramic body (1) away from the excitation source (3).

5. The near-infrared detection source assembly according to claim 4, characterized in that: The incident area of the excitation source (3) is larger than the area of the near-infrared fluorescent film (2) and smaller than the area of the near-infrared fluorescent ceramic body (1).

6. The near-infrared detection source assembly according to claim 4 or 5, characterized in that: The emission wavelength of the excitation source (3) is 700 nm to 830 nm.

Images