Full-spectrum multilayer composite fluorescent ceramic with high thermal stability for laser illumination

Abstract

The invention provides full-spectrum multi-layer composite fluorescent ceramic with high thermal stability for laser illumination. The full-spectrum multi-layer composite fluorescent ceramic is of a four-layer composite structure in total. The fourth layer is a ceramic chip prepared by mixing AlN and glass powder; the third layer is a main light-emitting layer and is PiG fluorescent ceramic formed by mixing yellow fluorescent powder, glass powder and a small amount of AlN; the second layer is a red fluorescent film and a green fluorescent film; and the first layer is an Al2O3 film prepared by magnetron sputtering. Due to the existence of AlN, the thermal stability of the ceramic is greatly improved, the full-spectrum illumination of the fluorescent ceramic is realized through the preparation of red and green films, the adhesive force of the fluorescent film is enhanced through the preparation of the Al2O3 film, the overall wear resistance and corrosion resistance of the fluorescent ceramic are enhanced, and the thermal stability is further enhanced.

Description

Technical field:

[0001] The invention belongs to the technical field of laser lighting and luminescence, and specifically designs a full-spectrum multi-layer composite fluorescent ceramic with high thermal stability. Background technology:

[0002] In the field of laser lighting, there is a growing demand for efficient and high-quality lighting sources. Laser lighting can learn from the method of combining LED chips with fluorescent materials to achieve white light, using short-wavelength lasers to excite fluorescent materials, and then mixing light of different wavelengths to achieve high-quality white light. This method has attracted widespread attention from scholars from all over the world. However, common fluorescent materials are prone to thermal quenching under high-power laser power due to the rapid accumulation of heat, resulting in a decrease in luminous efficiency, which seriously affects the lighting effect and stability. In addition, the existing single fluorescent materials are also insufficient in spectral coverage, making it difficult to achieve full-spectrum output and unable to meet people's needs for colorful, natural and realistic lighting. In laser lighting applications that pursue high light quality, such as stage lighting, car headlights, etc., not only high brightness and high color rendering index are required, but also the material needs to maintain stable performance under different working environments. However, the optical properties of existing fluorescent materials are prone to fluctuations when the temperature changes greatly, which limits the wide application and long-term reliability of laser lighting systems.

[0003] To overcome these problems, researchers have been working to develop new fluorescent materials with high thermal stability and full-spectrum output characteristics to meet the increasing performance requirements and application needs in the field of laser lighting. Summary of the invention:

[0004] In order to solve the above problems, the present invention provides a full-spectrum multi-layer composite fluorescent ceramic for laser lighting with high thermal stability and high-quality lighting effect:

[0005] The full-spectrum multi-layer composite fluorescent ceramic has a total of 4 layers of composite structure; the fourth layer is a thermal conductive ceramic substrate prepared by mixing AlN and glass powder; the third layer is the main light-emitting layer, which is a PiG fluorescent ceramic layer mixed with yellow fluorescent powder, glass powder and a small amount of AlN; the second layer is a red fluorescent film and a green fluorescent film; the first layer is an Al2O3 film prepared by magnetron sputtering.

[0006] The full-spectrum multi-layer composite fluorescent ceramic, the fourth layer of the AlN thermal conductive ceramic substrate and the third layer of the PiG fluorescent ceramic layer are double-layer fluorescent ceramics formed at one time.

[0007] The full-spectrum multi-layer composite fluorescent ceramic is characterized in that the red fluorescent film and the green fluorescent film of the second layer each occupy 1 / 4 of the total area of ​​the fluorescent ceramic.

[0008] The full-spectrum multi-layer composite fluorescent ceramic is characterized in that the first layer is coated with an Al2O3 film on the surface of the fluorescent ceramic film layer by magnetron sputtering, so as to completely wrap the second fluorescent film layer. Beneficial effects:

[0009] The present invention provides a full-spectrum multilayer composite fluorescent ceramic for laser lighting with high thermal stability. Reflective lighting applications are achieved through multilayer composite and PiG preparation technology. Due to the presence of AlN, the thermal stability of the ceramic is greatly improved. The full-spectrum lighting of the fluorescent ceramic is achieved through the preparation of red and green films. By sputtering Al2O3 films, the adhesion of the fluorescent film is enhanced, the wear resistance and corrosion resistance of the entire fluorescent ceramic are enhanced, and the thermal stability is further enhanced. Description of the drawings:

[0010] Figure 1 A top view of a full-spectrum multi-layer composite fluorescent ceramic structure provided for the implementation of the present invention.

[0011] Figure 2 A front view of a full-spectrum multi-layer composite fluorescent ceramic structure provided for the implementation of the present invention.

[0012] Figure 3 Electroluminescence spectrum of the full-spectrum multilayer composite fluorescent ceramic provided for the implementation of the present invention. Specific implementation method:

[0013] In order to enable those skilled in the art to better understand the technical solution of the present invention and implement it, the present invention is further described below in conjunction with specific embodiments and drawings, but the embodiments are not intended to limit the present invention.

[0014] The experimental methods and detection methods described in the following embodiments are conventional methods unless otherwise specified; the reagents and materials are commercially available unless otherwise specified.

[0015] The invention provides a multilayer composite fluorescent ceramic with high thermal stability for laser lighting and capable of realizing full-spectrum white light lighting.

[0016] like Figure 2 As shown: the present invention has a total of 4-layer composite structure; the fourth layer is a ceramic substrate prepared by mixing AlN and glass powder; the third layer is the main light-emitting layer, which is a PiG fluorescent ceramic mixed with yellow phosphor, glass powder and a small amount of AlN; the second layer is a red fluorescent film and a green fluorescent film; the first layer is an Al2O3 film prepared by magnetron sputtering.

[0017] The full-spectrum multilayer composite fluorescent ceramic has a fourth-layer AlN ceramic sheet that is a mixture of 30wt% glass powder and 70wt% AlN; the third-layer PiG fluorescent ceramic is 26wt% glass powder, 70wt% yellow fluorescent powder and 4wt% AlN; the first portion of powder is poured into a mold to make the powder flat, and then the second portion of powder is poured in, and dry pressing is first performed, and then cold isostatic pressing is performed to prepare a ceramic body, and the ceramic body is sintered at a temperature of 510°C for 20 minutes to obtain a double-layer fluorescent ceramic, and the total mass of both is 2g; the prepared composite ceramic has a diameter of 15mm and a thickness of 3mm; the melting point of the glass powder in the present invention is 450°C.

[0018] The arrangement of the red fluorescent film and the green fluorescent film of the second layer of the full-spectrum multilayer composite fluorescent ceramic is as follows: Figure 1 As shown; the preparation of the fluorescent film includes fluorescent powder and ink glue, which are mixed and stirred in a mass ratio of 1:0.5 to prepare a slurry, and the film is prepared by screen printing technology, the printing number is 1 time, and the film area accounts for 1 / 4 of the total area of ​​the fluorescent ceramic. After printing, the fluorescent film is sintered in a muffle furnace at 300°C for 5 hours to remove organic matter.

[0019] The full-spectrum multi-layer composite fluorescent ceramic has a first layer in which an Al2O3 film is plated on the surface of the fluorescent ceramic film layer by magnetron sputtering, so as to completely wrap the second fluorescent film layer.

[0020] The above-mentioned embodiments only express several implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the patent of the present invention. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A full-spectrum multilayer composite fluorescent ceramic for laser lighting with high thermal stability and high-quality lighting effect, characterized in that It has a total of 4 layers of composite structure; the fourth layer is a ceramic substrate prepared by mixing AlN and glass powder; the third layer is the main light-emitting layer, which is a PiG fluorescent ceramic mixed with yellow phosphor, glass powder and a small amount of AlN; the second layer is a red fluorescent film and a green fluorescent film; the first layer is an Al2O3 film prepared by magnetron sputtering.

2. The full-spectrum multilayer composite fluorescent ceramic according to claim 1, characterized in that: The fourth layer of AlN thermal conductive ceramic substrate and the third layer of PiG fluorescent ceramic layer are double-layer fluorescent ceramics formed in one step.

3. The full-spectrum multilayer composite fluorescent ceramic according to claim 1, characterized in that: The red fluorescent film and the green fluorescent film of the second layer each occupy 1 / 4 of the total area of ​​the fluorescent ceramic.

4. The full-spectrum multilayer composite fluorescent ceramic according to claim 1, characterized in that: The first layer is to plate Al2O3 thin film on the surface of the fluorescent ceramic thin film layer by magnetron sputtering, so as to completely wrap the second fluorescent thin film layer.

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