An adsorbable fluorescent film with a double-wing heat-conducting sandwich structure and its preparation method and application

Abstract

The present invention discloses an absorbable fluorescent film having a double-wing thermally conductive sandwich structure. The film comprises, from bottom to top, a thermally conductive substrate, a bottom fluorescent film, a magnetically absorbable metal thermally conductive film layer, and a top fluorescent film. The magnetically absorbable metal thermally conductive film layer is divided into two continuous sections. Along the length of the absorbable fluorescent film having the double-wing thermally conductive sandwich structure, the two continuous magnetically absorbable metal thermally conductive film sections are both located between the bottom fluorescent film and the top fluorescent film, but are located on either side of the bottom fluorescent film and the top fluorescent film, respectively. After extension, the two sections are connected to the thermally conductive substrate. The absorbable fluorescent film disclosed in the present invention can be connected to a heat dissipation attachment via magnetic force, ensuring that it is not easily detached in the high-temperature environment of a laser light source. While ensuring that the luminous performance is not damaged, the heat dissipation performance of the fluorescent film is greatly improved, ultimately resulting in a fluorescent film with a high saturation threshold.

Description

Technical Field

[0001] The present invention relates to the technical field of fluorescent films, and in particular to an adsorbable fluorescent film with a double-wing heat-conducting sandwich structure, a preparation method thereof, and applications thereof. Background Art

[0002] In recent years, laser diode-based fluorescent light sources have shown promising application prospects in high-power lighting applications and high-performance display products due to their ultra-high brightness and compact size. Lasers are high-energy electron beams with high energy density. When fluorescent materials are excited by high-power lasers, they experience severe luminescence quenching due to heat accumulation, ultimately causing irreversible damage to the light-emitting device. To further enhance the brightness of laser fluorescent light source devices and extend their service life and stability, it is necessary to address the heat dissipation problem of the fluorescent material during laser excitation, thereby promoting the widespread application of laser lighting technology in future production and daily life.

[0003] Fluorescent glass film materials have excellent overall performance and have good application prospects in the field of laser fluorescent light sources. However, fluorescent glass films are made of fluorescent materials and glass powder and need to be prepared under high-temperature sintering conditions. This leads to an inevitable decrease in the optical performance of the fluorescent material during the preparation process, thereby affecting the final application performance of the excited fluorescent light source. Currently, a common method of dissipating heat from fluorescent films is to dope them with heat dissipation materials with high thermal conductivity. However, the doping of heat dissipation materials will cause the original luminescence performance of the phosphor to decrease. In addition, currently common fluorescent films are difficult to fix directly to heat dissipation accessories and need to be fixed with thermal tape. However, in high-temperature working environments, the thermal tape is prone to debonding and failure, resulting in the fluorescent film falling off the heat dissipation accessory.

[0004] Therefore, the rapid preparation of adsorbable fluorescent films under room temperature conditions and the improvement of their heat dissipation performance are issues that need to be urgently addressed in the application of fluorescent materials in laser lighting and display devices. Summary of the Invention

[0005] In response to the shortcomings of the existing technology, the present invention discloses an adsorbable fluorescent film with a double-wing heat-conducting sandwich structure, which greatly improves the heat dissipation performance of the fluorescent film while ensuring that the luminous performance is not damaged, and ultimately obtains a fluorescent film with a high saturation threshold; and the fluorescent film prepared by the present invention has an adsorbable effect and can be connected to the heat dissipation accessory through magnetic force, thereby avoiding the fluorescent film from falling off due to the influence of the high temperature environment when excited by a laser light source.

[0006] The specific technical solutions are as follows:

[0007] An absorbable fluorescent film with a double-wing heat-conducting sandwich structure, comprising, from bottom to top, a heat-conducting substrate, a bottom fluorescent film, a magnetic metal heat-conducting film layer, and a top fluorescent film;

[0008] The magnetic metal thermal conductive film layer is divided into two continuous parts. Along the length direction of the adsorbable fluorescent film with a double-wing thermal conductive sandwich structure, the two continuous parts of the magnetic metal thermal conductive film layer are both located between the bottom fluorescent film and the top fluorescent film, but are respectively located on the two wing sides of the bottom fluorescent film and the top fluorescent film, and are respectively connected to the thermal conductive substrate after extension.

[0009] The technical solution proposed in the present invention is different from the existing technology that improves the heat dissipation performance by improving the composition of the fluorescent film. Instead, it improves the structure of the fluorescent film. By adding a layer of magnetic metal thermal conductive film on both wings of the two layers of fluorescent film, it not only significantly improves the heat dissipation performance of the fluorescent film, but also ensures that the fixation between the fluorescent film and the heat dissipation accessory is not affected by the high temperature environment.

[0010] The raw material composition of the magnetic metal thermal conductive film layer includes magnetic metal powder and light-curing resin;

[0011] The magnetic metal powder is selected from one or more of iron powder, nickel powder and cobalt powder;

[0012] It has been found through experiments that the type of magnetic metal powder has a significant impact on the heat dissipation performance of the absorbable fluorescent film finally prepared by the present invention.

[0013] Preferably, the magnetic metal powder is selected from iron powder and nickel powder, or cobalt powder and nickel powder.

[0014] The adsorbable fluorescent film prepared by using a combination of preferred magnetic metal powders has better heat dissipation performance.

[0015] Experiments have found that the mass ratio of magnetic metal powder to photocurable resin also has a significant impact on the heat dissipation performance of the final prepared adsorbable fluorescent film.

[0016] Taking the total weight of the magnetic metal thermal conductive film raw material as 100%, the proportion of the magnetic metal powder is 25-95wt%; preferably, the proportion of the magnetic metal powder is 50-90wt%; more preferably, it is 70wt%.

[0017] More preferably, the magnetic metal powder is selected from cobalt powder and nickel powder, and the mass ratio of cobalt powder to nickel powder is 0.6 to 9:1; more preferably 2.5 to 9:1; and most preferably 2.5:1.

[0018] The adsorbable fluorescent film prepared by combining the above-mentioned special content and special type has the best heat dissipation performance.

[0019] Experiments have shown that the distance between the two layers of magnetically attractive metal thermally conductive film has a significant impact on the heat dissipation performance of the final fluorescent film.

[0020] Preferably, the distance between the two continuous magnetic metal thermal conductive film layers is 1.1 to 2.5 times the diameter of the laser light source spot; more preferably, it is 1.1 to 2.0 times, and even more preferably, it is 2.0 times.

[0021] It has been found through experiments that the thickness of the magnetic metal thermal conductive film layer also has a significant impact on the heat dissipation performance of the ultimately prepared fluorescent film.

[0022] Preferably, the thickness of the magnetic thermally conductive metal film is 0.15 to 1.5 μm.

[0023] More preferably, the magnetic thermally conductive metal film has a thickness of 0.15 to 0.5 μm, and more preferably 0.5 μm.

[0024] The present invention also discloses a method for preparing the adsorbable fluorescent film having a double-wing heat-conducting sandwich structure, comprising the following steps:

[0025] a) mixing phosphor A and photocurable resin A uniformly and coating the mixture on a thermally conductive substrate, and then curing the mixture with ultraviolet light to deposit a bottom fluorescent film on the thermally conductive substrate;

[0026] b) mixing the magnetic metal powder and the light-curing resin B uniformly and applying the mixture to the two wings of the bottom fluorescent film, and then extending the mixture to the thermal conductive substrate, and then curing the mixture with ultraviolet light;

[0027] c) mixing the phosphor C and the photocurable resin C uniformly and coating the mixture on the thermally conductive substrate treated in step b), and curing the mixture with ultraviolet light to obtain the adsorbable fluorescent film having a double-wing thermally conductive sandwich structure.

[0028] The thermally conductive substrate is selected from a substrate having a thermal conductivity greater than 10Wm -1 k -1 The ceramic sheet or single crystal can be specifically selected from a sapphire substrate, a ceramic substrate, an aluminum substrate, and the like.

[0029] The phosphor A and phosphor C are selected from single phosphor or composite phosphor, and can be selected from conventional types in the art, such as La3Si6N 11 :Ce、Y3(Al,Ga)5O 12 :Ce, BaSi2O2N2:Eu, CaAlSiN3:Eu, Ba3Sc 1.9 Al 0.1 B4O 12 :Eu and other phosphors with different emission spectrum wavelengths.

[0030] Phosphor A and phosphor C may be the same or different.

[0031] The photocurable resin A, photocurable resin B and photocurable resin C are selected from conventional types in the art, and the three can be the same or different.

[0032] The preparation method disclosed in the present invention uses photocurable resin as raw material instead of the glass powder commonly used in the existing preparation process, avoiding the high-temperature sintering processing technology. Only a simple ultraviolet light curing process is used to realize the preparation of the fluorescent film. The process is simple and the production efficiency is high. It also avoids the inevitable optical performance degradation of the fluorescent material caused by high-temperature sintering conditions.

[0033] The present invention also discloses a laser lighting device, comprising a laser light source device, a heat dissipation accessory and the absorbable fluorescent film with a double-wing heat-conducting sandwich structure;

[0034] The adsorbable fluorescent film with a double-wing heat-conducting sandwich structure is tightly fixed to the heat dissipation accessory through magnetic force.

[0035] The laser light source device in the present invention can be selected from a blue light chip or a self-assembled light-emitting device, as long as it can emit light.

[0036] In the preparation of the adsorbable fluorescent film with a double-wing thermal conductive sandwich structure, the laser light source spot diameter refers to the spot diameter of the laser light source device. When a blue light chip is directly used as the laser light source, its spot diameter is factory-set and fixed; when a self-assembled light-emitting device is used as the laser light source, its spot diameter can be obtained through CCD camera testing, and this value can be adjusted by itself.

[0037] Preferably, the laser lighting device further comprises a magnet, which can be used to tightly connect the heat dissipation accessory and the adsorbable fluorescent film of the double-wing heat-conducting sandwich structure.

[0038] The laser light source device can be in indirect contact with the heat dissipation accessory through a magnet, or can be directly remotely excited without contact with the heat dissipation accessory.

[0039] Compared with the prior art, the present invention has the following beneficial effects:

[0040] The present invention discloses an adsorbable fluorescent film with a double-wing heat-conducting sandwich structure. The structure of the fluorescent film is improved by adding a layer of magnetic metal heat-conducting film on both wings of the two layers of fluorescent film. This not only significantly improves the heat dissipation performance of the fluorescent film, but also ensures that the fixation between the fluorescent film and the heat dissipation accessory is not affected by the high temperature environment.

[0041] The present invention discloses a method for preparing an adsorbable fluorescent film with a double-wing heat-conducting sandwich structure. The method uses a photocurable resin instead of glass powder, avoids the high-temperature sintering process, and can prepare the fluorescent film using only a simple ultraviolet light curing process. The process is simple, the production efficiency is high, and the inevitable optical performance degradation of the fluorescent material caused by high-temperature sintering conditions is avoided.

[0042] The present invention also discloses a laser light source device assembled with the adsorbable fluorescent film with a double-wing heat-conducting sandwich structure. In the device, the adsorbable fluorescent film with a double-wing heat-conducting sandwich structure can be tightly fixed to the heat dissipation accessory by magnetic force, thereby avoiding the traditional fixation with thermally conductive tape, in which the thermally conductive tape is easily debonded and fails in a high-temperature working environment, resulting in the fluorescent film falling off the heat dissipation accessory. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] Figure 1 This is a schematic structural diagram of the adsorbable fluorescent film with a double-wing heat-conducting sandwich structure disclosed in the present invention;

[0044] Figure 2 Schematic diagram of the positions of the double-wing heat-conducting sandwich structure adsorbable fluorescent film prepared in the present invention and the laser light source device during testing;

[0045] Figures 1-2 In the figure, 1 is the top fluorescent film, 2 is the magnetic metal thermal conductive film layer, 3 is the bottom fluorescent film, 4 is the thermal conductive substrate, 5 is the heat dissipation accessory, 6 is the magnet, and 7 is the laser light source device;

[0046] Figure 3 1 is a comparison chart of the heat dissipation performance of the fluorescent glass films prepared in Example 1 and Comparative Examples 1 to 4, respectively;

[0047] Figure 4 This is a comparison chart of the luminous flux of the fluorescent glass films prepared in Example 1 and Comparative Examples 1 to 4, respectively. DETAILED DESCRIPTION

[0048] The following is a clear and complete description of 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 making any creative efforts are within the scope of protection of the present invention.

[0049] The structural diagram of the adsorbable fluorescent film with a double-wing heat-conducting sandwich structure disclosed in the present invention is as follows: Figure 1 As shown, from bottom to top, it includes a thermal conductive substrate 4, a bottom fluorescent film 3, a magnetic metal thermal conductive film layer 2 and a top fluorescent film 1;

[0050] Along the length of the absorbable fluorescent film with a double-wing thermally conductive sandwich structure, the magnetically attractive metal thermally conductive film layer 2 is divided into two completely symmetrical portions. Both portions are located between the bottom fluorescent film 3 and the top fluorescent film 1, but are positioned on either side of the bottom fluorescent film 3 and the top fluorescent film 1, respectively. After extension, each portion is connected to the thermally conductive substrate 4. The distance between the two portions of the magnetically attractive metal thermally conductive film layer 2 is denoted as d, also referred to herein as the distance between the two wings.

[0051] Figure 2 This is a schematic diagram of a laser lighting device formed by assembling the adsorbable fluorescent film with a double-wing thermal conductive sandwich structure prepared by the present invention and a laser light source device, including the adsorbable fluorescent film with a double-wing thermal conductive sandwich structure, a heat dissipation accessory 5, a magnet 6 and a laser light source device 7.

[0052] In the present invention, the magnet 6 can be used to tightly connect the heat dissipation attachment 5 and the absorbable fluorescent film of the double-wing heat-conducting sandwich structure without the need to use a heat-conducting tape for fixation.

[0053] The laser light source device 7 in the present invention is selected from a blue light chip. The laser light source device 7 and the heat dissipation accessory 5 can be in indirect contact through a magnet or can be remotely excited.

[0054] The absorbable fluorescent film with a double-wing heat-conducting sandwich structure and the assembled laser lighting device prepared in the following examples all adopt the above structure, with only specific preparation conditions being different. Please refer to the examples and comparative examples for details.

[0055] according to Figure 2 As shown, the absorbable fluorescent film with a double-wing heat-conducting sandwich structure, the heat dissipation accessories, and the laser light source device are assembled into a laser lighting device, and its various performances are tested, including:

[0056] The transmittance of the fluorescent film was tested by using a UV-vis spectrophotometer (UV 3600plus, Shimadzu Japan);

[0057] The temperature of the luminous center point was tested by a thermal imaging camera (Fluke, Tix580, USA);

[0058] The saturation threshold was tested by a CCD spectrometer (Ocean Optical, HR4000, USA).

[0059] Example 1

[0060] Weigh 0.1g La3Si6N 11: Ce phosphor (Grirem Company, Beijing, China) and 0.1g photocurable resin (U-Cure9271 of Kaster Company, Kunshan, Jiangsu) were ground and mixed in an agate mortar for 15 minutes, and the mixture of phosphor and photocurable resin was coated on a sapphire thermal conductive substrate by a doctor blade method with a thickness of 0.3μm. The mixture was placed under ultraviolet light for 5 minutes for curing, and a bottom fluorescent film was successfully prepared on the thermal conductive substrate; 0.05g cobalt powder, 0.02g nickel powder (Hebei Qinmai Metal Materials Co., Ltd.) and 0.03g photocurable resin (Kaster Company, Kunshan, Jiangsu) were weighed and ground and mixed in an agate mortar for 20 minutes. The mixture of cobalt powder, nickel powder and photocurable resin was coated on both wings of the cured bottom fluorescent film with a thickness of 10μm. The degree is controlled at 0.5μm, the distance between the two wings is d=3mm, which is twice the diameter of the laser spot, and the coating layer is ensured to be in full contact with the sapphire substrate, and then it is placed under ultraviolet light for 5 minutes for curing to prepare a magnetic metal thermal conductive film layer; then 0.1gCaAlSiN3:Eu phosphor (Suzhou Rambo Optoelectronics Technology Co., Ltd.) and 0.1g photocurable resin (Jiangsu Kunshan Kaster Company) are weighed and ground and mixed in an agate mortar for 15 minutes, and the phosphor and photocurable resin mixture is applied to the cured bottom fluorescent film and the magnetic metal thermal conductive film layer by a blade coating method, with a thickness controlled at 0.3μm, and placed under ultraviolet light for 5 minutes for curing, finally obtaining the double-wing thermal conductive sandwich structure adsorbable fluorescent film.

[0061] According to tests, the double-wing heat-conducting sandwich structure adsorbable fluorescent film prepared in this embodiment has a saturation threshold of 8.5W, a transmittance of 71%, and a luminous center temperature of 72°C.

[0062] Comparative Example 1

[0063] Weigh 0.1g La3Si6N 11 :Ce phosphor (Grirem Company, Beijing, China) and 0.1g photocurable resin (Kaster Company, Kunshan, Jiangsu) were ground and mixed in an agate mortar for 15 minutes, and the mixture of phosphor and photocurable resin was coated on a sapphire thermal conductive substrate by a scraping method with a thickness of 0.3μm, and placed under ultraviolet light for 5 minutes for curing, and a bottom fluorescent film was successfully prepared on the thermal conductive substrate; 0.1gCaAlSiN3:Eu phosphor (Suzhou Rambo Optoelectronics Technology Co., Ltd.) and 0.1g photocurable resin (Kaster Company, Kunshan, Jiangsu) were weighed and ground and mixed in an agate mortar for 15 minutes, and the mixture of phosphor and photocurable resin was coated on the cured bottom fluorescent film by a scraping method with a thickness of 0.3μm, and placed under ultraviolet light for 5 minutes for curing, and finally a fluorescent film was obtained.

[0064] The fluorescent film structure prepared in this comparative example does not contain a magnetic metal thermal conductive film layer, and thermal conductive tape is required to fix the fluorescent film to the heat dissipation accessory. After testing, its saturation threshold is 5.6W, the transmittance is 74%, and the luminous center point temperature is 178°C.

[0065] Comparative Example 2

[0066] The preparation process is basically the same as that in Example 1, except that 0.05 g of silicon nitride powder, 0.02 g of magnesium oxide powder and 0.03 g of light-curing resin are used as raw materials when preparing the middle thermal conductive film layer.

[0067] The fluorescent film structure prepared in this comparative example contains a thermally conductive film layer, but it is not made of metal raw materials. It is still necessary to use thermally conductive tape to fix the fluorescent film to the heat dissipation accessories. After testing, its saturation threshold is 6.1W, the transmittance is 71%, and the luminous center point temperature is 143°C.

[0068] Comparative Example 3

[0069] The preparation process is basically the same as that of Example 1, the only difference is that when preparing the magnetic metal thermal conductive film layer, a mixture of cobalt powder, nickel powder and photocurable resin is coated on the cured underlying fluorescent film and its surface is fully covered, and the thickness is controlled at 0.5 μm.

[0070] The magnetically attractive metal thermally conductive film layer in the fluorescent film structure prepared in this comparative example is not located on the wings, but rather forms a fully covered sandwich structure. Using the structure of Example 1, the fluorescent film prepared in this comparative example was assembled into a laser lighting device. Testing showed a saturation threshold of 3.1W, a transmittance of 23%, and a center-of-light temperature of 214°C.

[0071] Example 2

[0072] The preparation process is basically the same as that of Example 1, with the only difference being that 0.07 g of iron powder is used instead of cobalt powder and nickel powder when preparing the magnetic metal thermal conductive film layer.

[0073] According to tests, the saturation threshold of the double-wing heat-conducting sandwich structure adsorbable fluorescent film prepared in this embodiment is 6.8W, the transmittance is 73%, and the luminous center temperature is 128°C.

[0074] Example 3

[0075] The preparation process is basically the same as that of Example 1, with the only difference being that 0.07 g of nickel powder is used instead of cobalt powder and nickel powder when preparing the magnetic metal thermal conductive film layer.

[0076] According to tests, the saturation threshold of the double-wing heat-conducting sandwich structure adsorbable fluorescent film prepared in this embodiment is 7.1W, the transmittance is 74%, and the luminous center temperature is 93°C.

[0077] Example 4

[0078] The preparation process is basically the same as that of Example 1, with the only difference being that 0.07 g of cobalt powder is used instead of cobalt powder and nickel powder when preparing the magnetic metal thermal conductive film layer.

[0079] According to tests, the saturation threshold of the double-wing heat-conducting sandwich structure adsorbable fluorescent film prepared in this embodiment is 7.5W, the transmittance is 74%, and the luminous center temperature is 78.5°C.

[0080] Example 5

[0081] The preparation process is basically the same as that of Example 1, except that 0.05g of iron powder, 0.02g of cobalt powder and 0.03g of light-curing resin are used as raw materials when preparing the magnetic metal thermal conductive film layer.

[0082] According to tests, the saturation threshold of the double-wing heat-conducting sandwich structure adsorbable fluorescent film prepared in this embodiment is 8W, the transmittance is 71%, and the luminous center temperature is 79°C.

[0083] Example 6

[0084] The preparation process is basically the same as that of Example 1, except that 0.05g of iron powder, 0.02g of nickel powder and 0.03g of light-curing resin are used as raw materials when preparing the magnetic metal thermal conductive film layer.

[0085] According to tests, the saturation threshold of the double-wing heat-conducting sandwich structure adsorbable fluorescent film prepared in this embodiment is 7.8W, the transmittance is 72%, and the luminous center temperature is 81°C.

[0086] Example 7

[0087] The preparation process is basically the same as that of Example 1, except that 0.063g of cobalt powder, 0.007g of nickel powder and 0.03g of photocurable resin are used as raw materials when preparing the magnetic metal thermal conductive film layer.

[0088] According to tests, the saturation threshold of the double-wing heat-conducting sandwich structure adsorbable fluorescent film prepared in this embodiment is 7.7W, the transmittance is 73%, and the luminous center temperature is 85°C.

[0089] Example 8

[0090] The preparation process is basically the same as that of Example 1, except that 0.028 g of cobalt powder, 0.042 g of nickel powder and 0.03 g of photocurable resin are used as raw materials when preparing the magnetic metal thermal conductive film layer.

[0091] According to tests, the double-wing heat-conducting sandwich structure adsorbable fluorescent film prepared in this embodiment has a saturation threshold of 7.2W, a transmittance of 72%, and a luminous center temperature of 91°C.

[0092] Example 9

[0093] The preparation process is basically the same as that of Example 1, except that 0.05 g of cobalt powder, 0.02 g of nickel powder and 0.28 g of photocurable resin are used as raw materials when preparing the magnetic metal thermal conductive film layer.

[0094] According to tests, the saturation threshold of the double-wing heat-conducting sandwich structure adsorbable fluorescent film prepared in this embodiment is 7W, the transmittance is 70%, and the luminous center temperature is 125°C.

[0095] Example 10

[0096] The preparation process is basically the same as that of Example 1, except that 0.05 g of cobalt powder, 0.02 g of nickel powder and 0.006 g of photocurable resin are used as raw materials when preparing the magnetic metal thermal conductive film layer.

[0097] According to tests, the saturation threshold of the double-wing heat-conducting sandwich structure adsorbable fluorescent film prepared in this embodiment is 6.7W, the transmittance is 72%, and the luminous center temperature is 130°C.

[0098] Example 11

[0099] The preparation process is basically the same as that of Example 1, with the only difference being that when preparing the magnetic metal thermal conductive film layer, the distance between the two wings is controlled to be d=3.75 mm, which is 2.5 times the diameter of the laser spot.

[0100] According to tests, the saturation threshold of the double-wing heat-conducting sandwich structure adsorbable fluorescent film prepared in this embodiment is 6W, the transmittance is 73%, and the luminous center temperature is 152°C.

[0101] Example 12

[0102] The preparation process is basically the same as that of Example 1, with the only difference being that when preparing the magnetic metal thermal conductive film layer, the distance between the two wings is controlled to be d=1.65 mm, which is 1.1 times the diameter of the laser spot.

[0103] According to tests, the saturation threshold of the double-wing heat-conducting sandwich structure adsorbable fluorescent film prepared in this embodiment is 7W, the transmittance is 73%, and the luminous center temperature is 101°C.

[0104] Example 13

[0105] The preparation process is basically the same as that of Example 1, except that the thickness of the magnetic metal thermal conductive film layer is controlled to be 1.5 μm when preparing the magnetic metal thermal conductive film layer.

[0106] According to tests, the saturation threshold of the double-wing heat-conducting sandwich structure adsorbable fluorescent film prepared in this embodiment is 5.8W, the transmittance is 73%, and the luminous center temperature is 159°C.

[0107] Example 14

[0108] The preparation process is basically the same as that of Example 1, except that the thickness of the magnetic metal thermal conductive film layer is controlled to be 0.15 μm when preparing the magnetic metal thermal conductive film layer.

[0109] According to tests, the saturation threshold of the double-wing heat-conducting sandwich structure adsorbable fluorescent film prepared in this embodiment is 7.3W, the transmittance is 71%, and the luminous center temperature is 89°C.

[0110] Comparative Example 4

[0111] The preparation process is basically the same as that of Example 1, except that the thickness of the magnetic metal thermal conductive film layer is controlled to be 2.0 μm when preparing the magnetic metal thermal conductive film layer.

[0112] According to tests, the double-wing heat-conducting sandwich structure adsorbable fluorescent film prepared in this embodiment has a saturation threshold of 4W, a transmittance of 73%, and a luminous center temperature of 186°C.

[0113] Figure 3 3 is a comparison chart of the heat dissipation performance of the fluorescent films prepared in Example 1 and Comparative Examples 1 to 4. The comparison shows that the temperature of the luminous center point of the fluorescent film prepared in Example 1 is much lower than that of the comparative examples, and the fluorescent film has far better heat dissipation performance than the comparative examples.

[0114] Figure 4 1 is a comparison chart of the luminous flux of the fluorescent films prepared in Example 1 and Comparative Examples 1 to 4. The comparison shows that the fluorescent film prepared in Example 1 has better luminous performance than the comparative examples, and both the saturation threshold and the luminous flux are improved.

[0115] The applicant declares that the present invention illustrates the detailed method of the present invention through the above embodiments, but the present invention is not limited to the above detailed method.

Claims

1. An adsorbable fluorescent film with a double-wing heat-conducting sandwich structure, characterized in that: From bottom to top, it includes: thermal conductive substrate, bottom fluorescent film, magnetic metal thermal conductive film layer and top fluorescent film; The magnetically absorbable metal thermally conductive film layer is divided into two continuous parts. Along the length direction of the absorbable fluorescent film with a double-wing thermally conductive sandwich structure, the two continuous magnetically absorbable metal thermally conductive film layers are both located between the bottom fluorescent film and the top fluorescent film, but are located on the two wings of the bottom fluorescent film and the top fluorescent film respectively, and are then connected to the thermally conductive substrate after being extended. The raw material composition of the magnetic metal thermal conductive film layer includes magnetic metal powder and light-curing resin; The magnetic metal powder is selected from one or more of iron powder, nickel powder and cobalt powder; Taking the total weight of the magnetic metal thermal conductive film raw material as 100%, the proportion of the magnetic metal powder is 25~95 wt%.

2. The absorbable fluorescent film with a double-wing heat-conducting sandwich structure according to claim 1, characterized in that: The magnetic metal powder is selected from iron powder and nickel powder, or cobalt powder and nickel powder.

3. The absorbable fluorescent film with a double-wing heat-conducting sandwich structure according to claim 2, characterized in that: The magnetic metal powder is selected from cobalt powder and nickel powder, and the mass ratio of cobalt powder to nickel powder is 0.6-9:

1.

4. The absorbable fluorescent film with a double-wing heat-conducting sandwich structure according to claim 1, characterized in that: The distance between the two continuous magnetic metal thermal conductive film layers is 1.1 to 2.5 times the diameter of the laser light source spot.

5. The absorbable fluorescent film with a double-wing heat-conducting sandwich structure according to claim 1, characterized in that: The thickness of the magnetic metal thermal conductive film layer is 0.15-1.5 μm.

6. A method for preparing an adsorbable fluorescent film having a double-wing heat-conducting sandwich structure according to any one of claims 1 to 5, characterized in that: The steps include: a) mixing phosphor A and photocurable resin A uniformly and coating the mixture on a thermally conductive substrate, and then curing the mixture with ultraviolet light to deposit a bottom fluorescent film on the thermally conductive substrate; b) mixing the magnetic metal powder and the light-curing resin B uniformly and applying the mixture to the two wings of the bottom fluorescent film, and then extending the mixture to the thermal conductive substrate, and then curing the mixture with ultraviolet light; c) mixing the phosphor C and the photocurable resin C uniformly and coating the mixture on the thermally conductive substrate treated in step b), and curing the mixture with ultraviolet light to obtain the adsorbable fluorescent film with a double-wing thermally conductive sandwich structure.

7. The method for preparing the adsorbable fluorescent film having a double-wing heat-conducting sandwich structure according to claim 6, characterized in that: The phosphor A and phosphor C are selected from single phosphor or composite phosphor, and the two can be the same or different; The photocurable resin A, the photocurable resin B and the photocurable resin C may be the same or different.

8. A laser lighting device, characterized in that: It comprises a laser light source device, a heat dissipation accessory and the adsorbable fluorescent film with a double-wing heat-conducting sandwich structure according to any one of claims 1 to 5; The adsorbable fluorescent film with a double-wing heat-conducting sandwich structure is tightly fixed to the heat dissipation accessory by magnetic force.

9. The laser lighting device according to claim 8, characterized in that: The laser light source device and the heat dissipation accessory may be in indirect contact via a magnet; or may be directly remotely excited without contact with the heat dissipation accessory.

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