A semi-coated fluorescent glass and a preparation method and application thereof

Abstract

The application provides a semi-coated fluorescent glass as well as a preparation method and application thereof. Metal oxide heat-conducting glass layers are coated on the outer ring and the bottom surface of the fluorescent glass. Under excitation of high-power blue laser, the heat accumulated on the fluorescent glass can be quickly transferred to the outside or a heat-conducting accessory through the outer ring metal oxide heat-conducting glass ring and the bottom surface metal oxide heat-conducting glass layer, so that the heat dissipation efficiency of the fluorescent glass during work is effectively improved, and higher luminous brightness and luminous efficiency are achieved. The semi-coated fluorescent glass can be excited by blue laser to realize a high-brightness fluorescent laser light source, and application requirements of new laser lighting and display products can be met.

Description

Technical Field

[0001] This invention relates to the field of novel lighting and display light source materials, specifically to a semi-encapsulated fluorescent glass, its preparation method, and its application in fluorescent laser light sources. Background Technology

[0002] In today's era, with the rapid development of industrialization, various industries have an increasing demand for high-power, high-brightness lighting. However, the "yellow ring phenomenon" and "efficiency drop" of LED lighting hinder its application in high-power lighting environments, thus necessitating research into next-generation lighting technologies. Laser lighting, as a novel light source technology, offers advantages over previous-generation LED lighting, including smaller size, higher brightness, and environmental friendliness. Currently, the mainstream direction of laser lighting technology is to use blue light to excite yellow phosphors and finally synthesize white light. This method is relatively low-cost, suitable for mass production, and shows promising application prospects in industrial production.

[0003] Because lasers are high-density, high-energy photon beams, they generate a significant amount of heat when exciting traditional phosphors. Since phosphors themselves cannot effectively dissipate heat, heat easily accumulates. Excessive heat accumulation during the operation of laser phosphor light source devices can lead to luminescence quenching, ultimately severely impacting the device's luminescence performance. Fluorescent glass possesses better heat dissipation performance than powder, and its simple preparation, low cost, and ease of mass production have attracted widespread attention in the field of laser phosphor light sources. However, due to the limitations of the thermal conductivity of the glass matrix itself, fluorescent glass materials still cannot achieve efficient heat dissipation under high-power laser excitation, which severely restricts their application in high-brightness laser phosphor light sources. Therefore, further improving the heat dissipation performance of fluorescent glass is an important development direction in the field of laser lighting. Summary of the Invention

[0004] To address the above problems, this invention provides a semi-encapsulated fluorescent glass, its preparation method, and its application.

[0005] A semi-enclosed fluorescent glass design. The semi-enclosed fluorescent glass design consists of fluorescent glass, a metal oxide thermally conductive glass ring, and a metal oxide thermally conductive glass layer. The metal oxide thermally conductive glass ring is located on the outer ring of the fluorescent glass, and the metal oxide thermally conductive glass layer is located on the bottom surface of the fluorescent glass.

[0006] In the semi-encapsulated fluorescent glass provided by the present invention, the fluorescent glass is a composite structure of a fluorescent phase and a glass matrix. The fluorescent phase is composed of a single phosphor or multiple phosphors, and the mass percentage of the fluorescent phase is 0.1-90%, preferably 30-50%. The thickness of the fluorescent glass film layer is 0.1-2 mm, preferably 0.5 mm.

[0007] In a semi-enclosed fluorescent glass provided by the present invention, the metal oxide thermally conductive glass ring is a composite structure of metal oxide thermally conductive filler and glass matrix. The thermally conductive filler is composed of a single metal oxide thermally conductive particle or multiple metal oxide thermally conductive particles. The mass percentage of the thermally conductive filler is 1-90%, preferably 30-80%. The width of the metal oxide thermally conductive glass ring is 1-5 mm, and the thickness of the metal oxide thermally conductive glass ring is consistent with that of the fluorescent glass.

[0008] In the semi-enclosed fluorescent glass of the present invention, the metal oxide thermally conductive glass layer is a composite structure of metal oxide thermally conductive filler and glass matrix. The composition and mass percentage of the metal oxide thermally conductive filler are consistent with those of the metal oxide thermally conductive glass ring, and the thickness of the metal oxide thermally conductive glass layer is 0.1-0.5 mm.

[0009] The present invention provides a method for preparing a semi-encapsulated fluorescent glass, comprising the following steps:

[0010] a) Mix the fluorescent powder and glass powder thoroughly in an agate mortar, place the well-mixed powder in a round mold, and compress it into tablets using a tablet press.

[0011] b) The thermally conductive filler and glass powder are thoroughly mixed in an agate mortar. The well-mixed powder is placed in a larger circular mold, and the circular sample obtained in a) is placed in the middle of the powder. Then, the powder is compressed into tablets in a tablet press.

[0012] c) The circular sample obtained by the above-mentioned secondary pressing is calcined at 400-800℃ for 5-20 minutes to obtain the semi-encapsulated fluorescent glass;

[0013] In step b), the thermally conductive filler has a thermal conductivity greater than 30 W / m³. -1 k -1 It is composed of single metal oxide thermal conductive particles or multiple metal oxide thermal conductive particles, preferably a mixture of CuO and Fe3O4 particles, wherein the mass ratio of CuO and Fe3O4 particles is 1:0.8 to 1.2, and the mass percentage of metal oxide thermal conductive particles is 1 to 90%, preferably 30 to 80%.

[0014] In step c), the sintering atmosphere is air, nitrogen, or a nitrogen / hydrogen mixture, preferably nitrogen.

[0015] The semi-enclosed fluorescent glass described above can achieve efficient heat dissipation under blue laser excitation, thereby improving the luminous brightness and operational stability of the fluorescent laser source.

[0016] Compared with the prior art, the present invention has the following advantages:

[0017] This invention provides a semi-enclosed fluorescent glass, in which both the outer ring and bottom surface of the fluorescent glass are covered with a metal oxide thermally conductive glass layer. Under high-power blue laser excitation, the heat accumulated on the fluorescent glass can be rapidly transferred to the outside or a heat-conducting accessory through the outer metal oxide thermally conductive glass ring and the bottom metal oxide thermally conductive glass layer, thereby effectively improving the heat dissipation efficiency of the fluorescent glass during operation and achieving higher luminous brightness and luminous efficiency. By exciting this semi-enclosed fluorescent glass with a blue laser, a high-performance fluorescent laser source can be realized, showing promising application prospects in high-power lighting fields. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of a semi-enclosed structure for improving the heat dissipation performance of fluorescent glass in this invention, wherein 1 is the outer metal oxide thermally conductive glass layer and 2 is the inner fluorescent glass layer.

[0019] Figure 2 This is a comparison diagram of the heat dissipation performance of the fluorescent glass film in Example 1 and Comparative Example 1 of this invention;

[0020] Figure 3 This is a comparison diagram of the luminous brightness of the fluorescent glass film in Example 1 and Comparative Example 1 of this invention;

[0021] Figure 4 The emission spectrum of the fluorescent laser source in Example 2 of this invention;

[0022] Figure 5 The emission spectrum of the fluorescent laser source in Example 3 of this invention;

[0023] Figure 6 This is the emission spectrum of the fluorescent laser source in Example 4 of this invention. Detailed Implementation

[0024] The technical solutions in the embodiments of the present invention will be clearly and completely described below. 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.

[0025] In this invention, a semi-encapsulated fluorescent glass is provided, wherein the fluorescent phase in the fluorescent glass is prepared by mixing one or more phosphors, which can be self-prepared or commercially available products; the glass matrix is ​​a low softening temperature glass, and its composition is consistent with the glass matrix composition in the metal oxide thermally conductive glass ring and the metal oxide thermally conductive glass layer; the mass percentage of the fluorescent phase in the fluorescent glass is 30-50%; and the thickness of the fluorescent glass is between 0.2-0.8 mm to ensure heat dissipation and illumination brightness; the thermally conductive filler in the metal oxide thermally conductive glass ring and the metal oxide thermally conductive glass layer is a mixture of CuO and Fe3O4 particles, but is not limited to these materials; and the mass percentage of the thermally conductive filler is 30-80% to ensure heat dissipation; the thickness of the metal oxide thermally conductive glass ring is consistent with that of the fluorescent glass; and the composition and mass percentage of the thermally conductive filler in the metal oxide thermally conductive glass layer are consistent with those of the metal oxide thermally conductive glass ring.

[0026] like Figure 1 As shown, the design structure of the present invention for a semi-enclosed fluorescent glass to improve heat dissipation performance includes a metal oxide thermally conductive glass layer 1 disposed on the outer layer and a fluorescent glass layer 2 disposed on the inner layer.

[0027] This invention provides a semi-encapsulated fluorescent glass and its preparation method, comprising the following steps:

[0028] a) Select a certain mass ratio of fluorescent phase and glass powder and grind them thoroughly in an agate mortar. Place the thoroughly ground powder in a round mold and press it into tablets in a tablet press.

[0029] b) The thermally conductive filler and glass powder are mixed using the same method described in step a). The mixed powder is placed in a larger circular mold, and the circular sample obtained in a) is placed in the center of the powder. Then, the powder is pressed into tablets using a tablet press.

[0030] c) The circular sample obtained by the above-mentioned secondary pressing is calcined at 400-800℃ for 5-20 minutes to obtain the semi-encapsulated fluorescent glass.

[0031] To further illustrate the technical solution of the present invention, preferred embodiments of the present invention are described below in conjunction with examples. However, it should be understood that these descriptions are only for further illustrating the features and advantages of the present invention, and not for limiting the claims of the present invention.

[0032] Example 1

[0033] Weigh 0.5g of YAGG:Ce phosphor (Suzhou Lanbo Optoelectronics Technology Co., Ltd.) and 0.5g of glass powder (K2O-Na2O-Al2O3-SiO2) and grind and mix them in an agate mortar for 45 minutes. Pour the uniformly mixed powder into a circular mold with a diameter of 1cm and press it into a disc shape using a tablet press under a pressure of 2.5MPa. Grind and mix CuO and Fe3O4 composite thermally conductive powder and glass powder (K2O-Na2O-Al2O3-SiO2) in an agate mortar for 45 minutes, wherein the mass ratio of CuO to Fe3O4 is 1:1 (0.5g CuO + 0.5g...). Fe3O4) The uniformly mixed powder is poured into a circular mold with a diameter of 3cm. At the same time, the disc obtained from the first pressing is placed in the middle of the powder, and the two are pressed together under a pressure of 3MPa using a tablet press. The disc after the second pressing is placed in a muffle furnace and calcined at 750℃ for 10 minutes. After natural cooling, the disc is polished to finally obtain the semi-encapsulated fluorescent glass.

[0034] Comparative Example 1 - Ordinary Fluorescent Glass

[0035] Weigh 0.5g of YAGG:Ce phosphor (Suzhou Lanbo Optoelectronics Technology Co., Ltd.) and 0.5g of glass powder (K2O-Na2O-Al2O3-SiO2) and grind and mix them in an agate mortar for 45 minutes. Pour the evenly mixed powder into a circular mold with a diameter of 1cm and press the powder into a disc shape under a pressure of 2.5MPa using a tablet press. Place the pressed disc into a muffle furnace and calcine it at 750℃ for 10 minutes. After natural cooling, polish the disc to finally obtain the ordinary fluorescent glass.

[0036] like Figure 2 As shown, the temperature at the emission center point of Example 1 under laser excitation is lower than that of Comparative Example 1.

[0037] like Figure 3 As shown, the light flux of Example 1 under laser excitation is greater than that of Comparative Example 1.

[0038] Example 2

[0039] Weigh 0.4g of La3Si6N 11Ce phosphor (Grirem Corporation, Beijing, China) and 0.6g of glass powder (K2O-Na2O-Al2O3-SiO2) were ground and mixed in an agate mortar for 45 minutes. The uniformly mixed powder was poured into a circular mold with a diameter of 1cm and pressed into a disc shape using a tablet press under a pressure of 2.5MPa. CuO and Fe3O4 composite thermally conductive powder and glass powder (K2O-Na2O-Al2O3-SiO2) were ground and mixed in an agate mortar for 45 minutes, wherein the preferred mass ratio of CuO to Fe3O4 was 3:7 (0.3g CuO + 0.7g...). Fe3O4), the uniformly mixed powder is poured into a circular mold with a diameter of 3cm, and a disc obtained from the first pressing is placed in the middle of the powder. The two discs are then pressed together under a pressure of 3MPa using a tablet press. The discs after the second pressing are placed in a muffle furnace and calcined at 750℃ for 15 minutes. After natural cooling, the discs are polished to finally obtain the semi-encapsulated fluorescent glass. Figure 4 As shown, a fluorescent laser source was obtained by excitation with a 450nm blue laser.

[0040] Example 3

[0041] Weigh 0.6g of YAG:Ce phosphor (Suzhou Lanbo Optoelectronics Technology Co., Ltd.) and 0.4g of glass powder (K2O-Na2O-Al2O3-SiO2) and grind and mix them in an agate mortar for 45 minutes. Pour the uniformly mixed powder into a circular mold with a diameter of 1cm and press it into a disc shape using a tablet press under a pressure of 2.5MPa. Grind and mix CuO and Fe3O4 composite thermally conductive powder and glass powder (K2O-Na2O-Al2O3-SiO2) in an agate mortar for 45 minutes, wherein the preferred mass ratio of CuO to Fe3O4 is 6:4 (0.6g CuO + 0.4g...). Fe3O4), the uniformly mixed powder is poured into a circular mold with a diameter of 3cm, and a disc obtained from the first pressing is placed in the middle of the powder. The two discs are then pressed together under a pressure of 3MPa using a tablet press. The discs after the second pressing are placed in a muffle furnace and calcined at 700℃ for 10 minutes. After natural cooling, the discs are polished to finally obtain the semi-encapsulated fluorescent glass. Figure 5 As shown, a fluorescent laser source was obtained by excitation with a 450nm blue laser.

[0042] Example 4

[0043] 0.05g of CaAlSiN3:Eu phosphor (Suzhou Lanbo Optoelectronics Technology Co., Ltd.), 0.45g of YAGG:Ce phosphor (Suzhou Lanbo Optoelectronics Technology Co., Ltd.), and 0.5g of glass powder (SiO2-B2O3-Na2O) were ground and mixed in an agate mortar for 45 minutes. The uniformly mixed powder was poured into a circular mold with a diameter of 1cm and pressed into a disc shape using a tablet press under a pressure of 2.5MPa. CuO and Fe3O4 composite thermally conductive powder and glass powder (K2O-Na2O-Al2O3-SiO2) were ground and mixed in an agate mortar for 45 minutes, with the preferred mass ratio of CuO to Fe3O4 being 6:4 (0.6g CuO + 0.4g...). Fe3O4), the uniformly mixed powder is poured into a circular mold with a diameter of 3cm, and a disc obtained from the first pressing is placed in the middle of the powder. The two discs are then pressed together under a pressure of 3MPa using a tablet press. The discs after the second pressing are placed in a muffle furnace and calcined at 650℃ for 10 minutes. After natural cooling, the discs are polished to finally obtain the semi-encapsulated fluorescent glass. Figure 6 As shown, a fluorescent laser source was obtained by excitation with a 450nm blue laser.

Claims

1. A method for preparing a semi-encapsulated fluorescent glass, characterized in that, Includes the following steps: a) Mix the fluorescent powder and glass powder thoroughly in an agate mortar, place the well-mixed powder in the first circular mold, and compress it into tablets using a tablet press. b) The metal oxide thermally conductive filler and glass powder are placed in an agate mortar and mixed thoroughly. The mixed powder is placed in a second circular mold, and the circular sample obtained in a) is placed in the center of the powder. Then, the powder is compressed into tablets in a tablet press. c) The circular sample obtained after secondary pressing is calcined at 400~800℃ for 5~20 minutes to obtain the semi-encapsulated fluorescent glass; The semi-enclosed fluorescent glass comprises: fluorescent glass, a metal oxide thermally conductive glass ring, and a metal oxide thermally conductive glass layer, wherein the metal oxide thermally conductive glass ring is located on the outer ring of the fluorescent glass, and the metal oxide thermally conductive glass layer is located on the bottom surface of the fluorescent glass. The metal oxide thermally conductive glass ring is a composite structure of thermally conductive filler and glass matrix. The thermally conductive filler is composed of single metal oxide thermally conductive particles or multiple metal oxide thermally conductive particles, and the mass percentage of the thermally conductive filler is 1~90%. The metal oxide thermally conductive glass layer is a composite structure of thermally conductive filler and glass matrix, and the composition and mass percentage of the thermally conductive filler are consistent with those of the metal oxide thermally conductive glass ring.

2. The preparation method according to claim 1, characterized in that, The fluorescent glass is a composite structure of a fluorescent phase and a glass matrix. The fluorescent phase is composed of a single phosphor or multiple phosphors, with a mass percentage of 0.1% to 90%, and the thickness of the fluorescent glass is 0.1% to 2mm.

3. The preparation method according to claim 1, characterized in that, The width of the metal oxide thermally conductive glass ring is 1~5mm, and the thickness of the metal oxide thermally conductive glass ring is consistent with the thickness of the fluorescent glass.

4. The preparation method according to claim 1, characterized in that, The thickness of the metal oxide thermally conductive glass layer is 0.1~0.5mm.

5. The preparation method according to claim 1, characterized in that, In step b), the metal oxide thermally conductive filler has a thermal conductivity greater than 30 W / m². -1 k -1 It consists of single metal oxide thermal conductive particles or multiple metal oxide thermal conductive particles.

6. The preparation method according to claim 1, characterized in that, In step b), the metal oxide thermally conductive filler is a mixture of CuO and Fe3O4 particles in a mass ratio of 1:0.8~1.

2.

7. The preparation method according to claim 1, characterized in that, In step c), the sintering atmosphere is air, nitrogen, or a nitrogen / hydrogen mixture.

8. The application of the semi-encapsulated fluorescent glass prepared by the preparation method according to any one of claims 1-7 in the preparation of fluorescent laser light sources.

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