阅读说明：本技术 一种激光激发荧光玻璃膜及其制备方法 (Laser-excited fluorescent glass film and preparation method thereof ) 是由 王乐 孟遥 邾强强 张宏 翟玥 胡翔宇 曹丽 于 2020-11-26 设计创作，主要内容包括：本发明公开了一种激光激发荧光玻璃薄膜及其制备方法,所述荧光玻璃薄膜为双面复合荧光玻璃薄膜结构,该荧光玻璃薄膜结构包括蓝宝石基片一侧的YAGG：Ce~(3+)荧光玻璃薄膜和蓝宝石基片另一侧的GdYAG：Ce~(3+)荧光玻璃薄膜。制备方法包括：制备黄绿色荧光粉-玻璃粉混合浆料；制备橙色荧光粉-玻璃粉混合浆料；制备激光激发荧光玻璃薄膜。本发明采用黄绿色和橙色发光荧光薄膜复合可以解决单一黄色发光YAG：Ce~(3+)荧光薄膜中绿光和红光成分不足的问题,提高获得白光的显色指数。同时,双面复合结构不仅可以避免多膜层叠加带来的膜层易开裂和散热性能下降的问题,还可以实现不同荧光粉层厚度的精细控制。(The invention discloses a laser-excited fluorescent glass film and a preparation method thereof, wherein the fluorescent glass film is a double-sided composite fluorescent glass film structure, and the fluorescent glass film structure comprises YAGG on one side of a sapphire substrate: ce 3+ GdYAG on the other side of the fluorescent glass film and sapphire substrate: ce 3+ A fluorescent glass film. The preparation method comprises the following steps: preparing yellow-green fluorescent powder-glass powder mixed slurry; preparing orange fluorescent powder-glass powder mixed slurry; and preparing the laser-excited fluorescent glass film. The invention adopts the yellow-green and orange luminescent fluorescent films to compound, which can solve the problems of single yellow luminescent YAG: ce 3+ The fluorescent film has insufficient green light and red light components, and the color rendering index of white light is improved. Meanwhile, the double-sided composite structure can avoid the problems of easy cracking of the film layers and reduction of heat dissipation performance caused by superposition of multiple film layers, and can also realize fine control of the thicknesses of different fluorescent powder layers.)

1. A laser-excited fluorescent glass film, comprising a yellow-green luminescent YAGG: ce^{3 +}Fluorescent glass film and deviceOrange luminescence GdYAG on the other side of the substrate: ce³⁺And the fluorescent glass film forms a double-sided composite fluorescent glass film structure.

2. The laser-excited fluorescent glass film of claim 1, wherein the substrate is a sapphire substrate.

3. The laser-excited fluorescent glass film of claim 1, wherein the yellow-green luminescent YAGG: ce³⁺The fluorescent glass film adopts a mass ratio of 2: 1-6 yellow green fluorescent powder Y₃Al₃Ga₂O₁₂：Ce³⁺And glass powder.

4. The laser-excited fluorescent glass film according to claim 1, wherein the ratio of orange luminescence GdYAG: ce^{3 +}The fluorescent glass film adopts a mass ratio of 2: 1-6 orange fluorescent powder GdY₂Al₅O₁₂：Ce³⁺And glass powder.

5. The method for producing a laser-excited fluorescent glass film according to any one of claims 1 to 4, comprising the steps of:

(1) mixing the yellow-green fluorescent powder and the glass powder, adding the organic slurry, and uniformly mixing to obtain yellow-green fluorescent powder-glass powder mixed slurry;

(2) mixing orange fluorescent powder and glass powder, adding organic slurry, and uniformly mixing to obtain orange fluorescent powder-glass powder mixed slurry;

(3) uniformly coating the yellow green fluorescent powder-glass powder mixed slurry prepared in the step (1) on the surface of one side of the sapphire substrate, and curing and sintering for the first time to form a film, so as to obtain yellow green luminescent YAGG: ce³⁺A fluorescent glass film; and (3) uniformly coating the orange fluorescent powder-glass powder mixed slurry prepared in the step (2) on the surface of the other side of the sapphire substrate, and curing and sintering for the second time to form a film, so as to obtain orange luminescent GdYAG: ce³⁺Fluorescent glass film to form double-sided composite fluorescent glassAnd obtaining the laser-excited fluorescent glass film.

6. The method for preparing a laser-excited fluorescent glass film according to claim 5, wherein in the step (1), Y is adopted as the yellow-green fluorescent powder₃Al₃Ga₂O₁₂：Ce³⁺Fluorescent powder;

in the step (2), GdY is selected as the orange fluorescent powder₂Al₅O₁₂：Ce³⁺And (3) fluorescent powder.

7. The method for preparing a laser-excited fluorescent glass film according to claim 5, wherein in the steps (1) and (2), the organic slurry is prepared from ethyl acetate, ethyl cellulose and terpineol according to a mass ratio of 3: 0.8-1.1: 14-18, and stirring at a speed of 500-650 rpm/s for 6-10 h at 85-80 ℃.

8. The method for preparing a laser-excited fluorescent glass film according to claim 5, wherein in the step (1), the ratio of the amount of the yellow-green phosphor to the amount of the glass powder to the amount of the organic paste is 0.3 to 0.75 g: 0.25-0.6 g: 0.8-1.1 ml;

in the step (2), the ratio of the used amounts of the orange fluorescent powder, the glass powder and the organic slurry is 0.3-0.75 g: 0.25-0.6 g: 0.8 to 1.1 ml.

9. The method for preparing a laser-excited fluorescent glass film according to claim 5, wherein in the step (3), the coating thickness of the yellow-green phosphor-glass powder mixed slurry is controlled to be 50-130 μm;

the conditions of the first curing and sintering are as follows: curing for 10-15 min on a heating table at 80-110 ℃, transferring to a muffle furnace after molding, burning to 700-800 ℃ at 5-35 ℃, and cooling to 5-35 ℃ to obtain yellow-green luminescent YAGG: ce³⁺A fluorescent glass film.

10. The method for preparing a laser-excited fluorescent glass film according to claim 5, wherein in the step (3), the coating thickness of the orange phosphor-glass powder mixed slurry is controlled to be 50-130 μm;

the conditions of the second curing and sintering are as follows: uniformly scraping and coating the orange fluorescent powder-glass powder mixed slurry, placing the mixture on a heating table at the temperature of 80-110 ℃ for curing for 10-15 min, transferring the mixture to a muffle furnace after molding, burning the mixture to 700-800 ℃ at the temperature of 5-35 ℃, and cooling the mixture to 5-35 ℃ to obtain orange luminescent GdYAG: ce³⁺A fluorescent glass film.

Technical Field

The invention relates to the field of fluorescent glass films, in particular to a laser-excited fluorescent glass film and a preparation method thereof.

Background

It is known that white Light LEDs (LEDs) have many advantages, such as energy saving, high efficiency, high reliability, and environmental friendliness, while blue LED chips have the problem of "efficiency dip". This problem makes LED chips unsuitable for use in ultra-high power or brightness solid state lighting applications. In contrast, the light emitting efficiency of a Laser Diode (LD) is proportional to the input current, and high-power excitation light can be obtained. The laser shows excellent characteristics such as high brightness, excellent directivity, good monochromaticity and small area of an emission spot, so that the high-power white light generated by exciting the fluorescent conversion material by the laser has very good application prospect.

White light laser illumination has a significant advantage over white light LED light sources, and is widely used, but still has some problems. The conventional fluorescent conversion material (phosphor + organic binder) for white LED is carbonized under the excitation of high-density laser due to poor heat resistance and low thermal conductivity. Thereby reducing the light efficiency and light color quality of the laser and prolonging the service life of the laser. The problems of heat dissipation and deterioration of the fluorescent conversion material under the excitation of high-power laser can be effectively solved by plating the fluorescent material on the high-thermal-conductivity sapphire substrate. However, the current fluorescent glass film materials for laser illumination and laser projection displays generally use a single yellow emitting YAG: ce³⁺As a fluorescence conversion material, since YAG: ce³⁺The light emission spectrum of the light-emitting diode lacks effective green light and red light components, so that the final laser white light shows a lower color rendering index or color gamut, and warm white light emission cannot be realized, thereby greatly limiting the application of laser illumination and laser projection display in the high color rendering field.

Disclosure of Invention

The invention aims to overcome the defects of the prior art and provide a laser-excited fluorescent glass film with high luminous efficiency and good color rendering property.

The second purpose of the invention is to provide a preparation method of the laser-excited fluorescent glass film.

In order to realize the first invention object of the invention, the technical scheme is that the sapphire substrate comprises a fluorescent glass film coated on one side surface of a sapphire substrate, the sapphire substrate and a fluorescent glass film coated on the other side surface of the sapphire substrate, the fluorescent glass film is of a double-sided composite fluorescent glass film structure, and the fluorescent glass film structure comprises Y on one side of the sapphire substrate₃Al₃Ga₂O₁₂：Ce³⁺(YAGG：Ce³⁺) GdY on the other side of the fluorescent glass film and the sapphire substrate₂Al₅O₁₂：Ce³⁺(GdYAG：Ce³⁺) A fluorescent glass film. Under the excitation of blue laser, YAGG is doped: ce³⁺The fluorescent glass film can emit broad-spectrum yellow green light about 525nm, and is doped with GdYAG: ce³⁺The fluorescent glass film can emit broad-spectrum orange light of about 580 nm. The single yellow light-emitting YAG can be solved by compounding yellow-green and orange light-emitting fluorescent films: ce³⁺The fluorescent film has insufficient green light and red light components, and the color rendering index of white light is improved. Meanwhile, the double-sided composite structure can avoid the problems of easy cracking of the film layers and reduction of heat dissipation performance caused by superposition of multiple film layers, and can also realize fine control of the thicknesses of different fluorescent powder layers.

A laser-excited fluorescent glass film comprising a yellow-green luminescent YAGG: ce³⁺Fluorescent glass film (i.e. yellow-green luminescence YAGG: Ce)³⁺Fluorescent glass film) and orange light emitting GdYAG: ce³⁺Fluorescent glass film (i.e., orange luminescence GdYAG: Ce)³⁺Fluorescent glass film) to form a double-sided composite fluorescent glass film (i.e. double-sided composite fluorescent glass film) structure.

The substrate is a sapphire substrate.

The yellow-green luminous YAGG: ce³⁺The fluorescent glass film adopts a mass ratio of 2: 1-6 yellow green fluorescent powder Y₃Al₃Ga₂O₁₂：Ce³⁺And glass powder.

The orange luminescence GdYAG: ce³⁺The fluorescent glass film adopts a mass ratio of 2: 1-6 orange fluorescent powder GdY₂Al₅O₁₂：Ce³⁺And glass powder.

In order to achieve the second invention purpose, the technical scheme is that the preparation method of the laser excitation fluorescent glass film comprises the following steps:

(1) preparing yellow green fluorescent powder-glass powder mixed slurry: mixing the yellow-green fluorescent powder and the glass powder, adding the organic slurry, and uniformly mixing to obtain yellow-green fluorescent powder-glass powder mixed slurry;

(2) preparing orange fluorescent powder-glass powder mixed slurry: mixing orange fluorescent powder and glass powder, adding organic slurry, and uniformly mixing to obtain orange fluorescent powder-glass powder mixed slurry;

(3) preparing a laser-excited fluorescent glass film: uniformly coating the yellow green fluorescent powder-glass powder mixed slurry prepared in the step (1) on the surface of one side of the sapphire substrate, and curing and sintering for the first time to form a film, so as to obtain yellow green luminescent YAGG: ce³⁺And (3) a fluorescent glass film, uniformly coating the orange fluorescent powder-glass powder mixed slurry prepared in the step (2) on the surface of the other side of the sapphire substrate, and curing and sintering for the second time to form a film, so as to obtain orange luminescent GdYAG: ce³⁺And forming a double-sided composite fluorescent glass film to obtain the laser-excited fluorescent glass film.

In the step (1), preferably, Y is selected as the yellow-green phosphor₃Al₃Ga₂O₁₂：Ce³⁺The fluorescent powder is used as a raw material, and a commercial product, such as a product produced by Lanbo photoelectric technology Limited company in Suzhou city, can be specifically adopted;

preferably, the organic slurry is prepared from ethyl acetate, ethyl cellulose and terpineol according to a mass ratio of 3: 0.8-1.1: 14-18, and stirring the mixture in a heat collection type constant temperature heating magnetic stirrer at 85-80 ℃ for 6-10 hours at the speed of 500-650 rpm, wherein the most preferable organic slurry is prepared from ethyl acetate, ethyl cellulose and terpineol according to the mass ratio of 3: 1: 16 and stirring the mixture at the speed of 600 revolutions per second for 8 hours at the temperature of 80 ℃.

Preferably, the glass powder is low-melting-point glass powder, and the melting point range is 600-700 ℃.

Preferably, the ratio of the yellow-green fluorescent powder to the glass powder to the organic paste is 0.3-0.75 g: 0.25-0.6 g: 0.8 to 1.1 ml. Most preferably, the ratio of the yellow-green fluorescent powder to the glass powder to the organic paste is 0.5 g: 0.5 g: 1 ml.

In the step (2), GdY is preferably selected as the orange fluorescent powder₂Al₅O₁₂：Ce³⁺The fluorescent powder is used as a raw material, and a commercial product, such as a product produced by Lanbo photoelectric technology Limited company in Suzhou city, can be specifically adopted;

preferably, the organic slurry is prepared from ethyl acetate, ethyl cellulose and terpineol according to a mass ratio of 3: 0.8-1.1: 14-18, and stirring the mixture in a heat collection type constant temperature heating magnetic stirrer at 85-80 ℃ for 6-10 hours at the speed of 500-650 rpm, wherein the most preferable organic slurry is prepared from ethyl acetate, ethyl cellulose and terpineol according to the mass ratio of 3: 1: 16 and stirring the mixture at the speed of 600 revolutions per second for 8 hours at the temperature of 80 ℃.

Preferably, the glass powder is low-melting-point glass powder, and the melting point range is 600-700 ℃.

Preferably, the ratio of the usage amount of the orange fluorescent powder, the glass powder and the organic slurry is 0.3-0.75 g: 0.25-0.6 g: 0.8 to 1.1 ml. Most preferably, the ratio of the usage amount of the orange fluorescent powder, the glass powder and the organic paste is 0.5 g: 0.5 g: 1 ml.

In the step (3), according to the required sintering temperature, uniformly coating a film layer with a higher optimal sintering temperature on the surface of one side of the sapphire substrate, curing and sintering to form a film, uniformly coating a film layer with a lower optimal sintering temperature on the surface of the other side of the sapphire substrate, curing and sintering to form a film, and obtaining the composite fluorescent glass film.

Preferably, the coating thickness of the yellow-green fluorescent powder-glass powder mixed slurry is controlled to be 50-130 mu m. Most preferably, the yellow-green phosphor-glass frit mixed slurry is coated in two times, wherein the coating thickness is 55 μm each time, and the slurry is cured and sintered after each coating.

Preferably, the conditions for preparing a layer of yellow-green fluorescent glass film coating by the first curing and sintering are as follows: after uniformly scraping and coating the yellow-green fluorescent powder-glass powder mixed slurry, placing the mixture on a heating table at 80-110 ℃ for curing for 10-15 min, transferring the mixture to a muffle furnace after molding, burning the mixture to 700-800 ℃ at 5-35 ℃, and cooling the mixture to 5-35 ℃ to obtain yellow-green luminescent YAGG: ce³⁺A fluorescent glass film. Most preferably, the conditions for preparing a yellow-green fluorescent glass film coating by the first curing and sintering are as follows: uniformly scraping and coating the yellow-green fluorescent powder-glass powder mixed slurry, placing the mixture on a heating table at 100 ℃ for curing for 12min, transferring the mixture to a muffle furnace after molding, burning the mixture to 750 ℃ at 25 ℃, and annealing the mixture to 25 ℃ to obtain yellow-green luminescent YAGG: ce³⁺A fluorescent glass film.

Preferably, the coating thickness of the orange phosphor-glass powder mixed slurry is controlled to be 50-130 μm. Most preferably, the orange phosphor-glass powder mixed slurry is coated once, the coating thickness is 55 μm, and the coating is cured and sintered.

Preferably, the conditions for preparing the orange fluorescent glass film coating by the second curing and sintering are as follows: uniformly scraping and coating the orange fluorescent powder-glass powder mixed slurry, placing the mixture on a heating table at the temperature of 80-110 ℃ for curing for 10-15 min, transferring the mixture to a muffle furnace after molding, burning the mixture to 700-800 ℃ at the temperature of 5-35 ℃, and cooling to 25 ℃ to obtain orange luminescent GdYAG: ce³⁺A fluorescent glass film. Most preferably, the conditions for preparing a coating of orange fluorescent glass film by the second curing and sintering are as follows: uniformly scraping and coating the orange fluorescent powder-glass powder mixed slurry, then placing the mixture on a heating table at 100 ℃ for curing for 12min, transferring the mixture into a muffle furnace after molding, burning the mixture to 750 ℃ at 25 ℃, and cooling the mixture to 5-35 ℃ to obtain orange luminescent GdYAG: ce³⁺A fluorescent glass film.

The fluorescent glass film has the advantages of high thermal conductivity, high color development, high luminous intensity and the like, is applied to white light laser illumination and laser projection display, can optimize a white light laser packaging structure, realizes resin-free packaging, and effectively improves the color development index and the luminous stability under high power of the white light laser illumination and the laser projection display.

Compared with the prior art, the invention has the following advantages:

(1) the fluorescent glass film prepared by the invention adopts YAGG: ce³⁺Yellow-green emitting phosphor and GdYAG: ce³⁺The orange luminescent fluorescent powder can effectively improve the luminous efficiency and the color rendering performance of white light.

(2) According to the fluorescent glass film prepared by the invention, the two surfaces of the sapphire substrate are respectively coated with the film coating layers, so that the problems of easy cracking of the film layers and reduction of heat dissipation performance caused by the superposition of multiple film layers can be avoided, and the thickness of different fluorescent powder layers can be finely controlled.

(3) The fluorescent glass film prepared by the invention can organically regulate and control optical properties such as luminous efficiency, color temperature, color rendering index or color gamut of a white light laser light source by regulating the proportion of the glass powder to the fluorescent powder and the thickness of the fluorescent powder layer.

Drawings

The invention is further described with reference to the drawings and the detailed description.

FIG. 1 is a schematic view of a fluorescent glass film provided in an embodiment of the present invention;

FIG. 2 is an XRD spectrum of the fluorescent glass thin film and the corresponding phosphor prepared in example 1;

FIG. 3 is a photograph of the laser white light source obtained in example 1;

FIG. 4 shows a fluorescent glass film prepared in example 1 with a single YAG: ce³⁺The luminescence property of the fluorescent glass film is compared with the figure.

Detailed Description

The present invention will be described in detail below with reference to the attached drawings. It is to be understood that structural, methodological, or functional changes made by those of ordinary skill in the art in light of the above description are included within the scope of the present invention.

As shown in figure 1, the present inventionThe phosphor comprises a fluorescent glass film 1 (i.e., a yellowish green luminous YAGG: Ce) coated on one side surface of a sapphire substrate³⁺Fluorescent glass film), a sapphire substrate 2, a fluorescent glass film 3 (i.e., orange emission GdYAG: ce³⁺Fluorescent glass film), fluorescent glass film is two-sided compound fluorescent glass film structure, and this fluorescent glass film structure includes the luminous YAGG of yellow green of sapphire substrate one side: ce³⁺Orange luminescence GdYAG of the other side of the fluorescent glass film and sapphire substrate: ce³⁺A fluorescent glass film.

Example 1: a fluorescent glass film is prepared from 50 wt% of commercial K₂O-Na₂O-Al₂O₃-SiO₂Glass powder and 50 wt% of YAGG Ce³⁺Yellow green phosphor, 50 wt% commercial K₂O-Na₂O-Al₂O₃-SiO₂Glass powder and 50 wt% of GdYAG Ce³⁺Orange fluorescent powder.

The commercial YAGG: Ce³⁺Phosphor (Nabo opto-electronic technology, Suzhou) and GdYAG: Ce³⁺Fluorescent powder (Suzhou Lanbo photoelectric technology limited) and commercial K₂O-Na₂O-Al₂O₃-SiO₂Glass powder (Wu-jin-xing-Hai chemical Co., Ltd., Changzhou city) is prepared by mixing the following components in a mass ratio of 1: 1, adding organic slurry, wherein the organic slurry is prepared from ethyl acetate (more than or equal to 88.5 percent of Shanghai Aladdin Biotechnology Co., Ltd.), ethyl cellulose (18-22 mPa.S) and terpineol (85 percent of Shanghai Aladdin Biotechnology Co., Ltd.) according to a mass ratio of 3: 1: 16 is uniformly mixed and stirred in a heat collection type constant temperature heating magnetic stirrer (Steud City & Waals, Ltd.) at the temperature of 80 ℃ for 8 hours at the speed of 600 r/s to prepare the yellow-green fluorescent powder YAGG: Ce) to be gel-like³⁺The ratio of the using amount of the glass powder to the using amount of the organic slurry is 0.5 g: 0.5 g: 1ml, and obtaining yellow green fluorescent powder-glass powder mixed slurry after even mixing, orange fluorescent powder GdYAG: Ce³⁺The ratio of the using amount of the glass powder to the using amount of the organic slurry is 0.5 g: 0.5 g: 1ml, and is obtained after being mixed evenlyObtaining orange fluorescent powder-glass powder mixed slurry, and respectively coating YAGG on two sides of the sapphire substrate: ce³⁺PiG (two coats, 55 μm each, cure sintered after each coat) and a layer of GdYAG: ce³⁺And (3) carrying out PiG (primary coating, coating with 55 mu m, and curing and sintering after coating), curing and molding on a heating table, placing in a muffle furnace, heating to the maximum temperature of 750 ℃ at the room temperature of 25 ℃ (the optimal sintering temperature is related to a glass powder matrix, and the glass powder used by the prepared sample is the same, so the sintering temperature is 750 ℃, keeping the temperature for 10min, cooling to the room temperature of 25 ℃, and taking out to obtain the fluorescent glass film.

The prepared fluorescent glass film is cut into a size of 2.5 multiplied by 2.5mm, and is excited by blue laser of 7.4W, so that the color temperature of the fluorescent glass film is 7328K, and the color rendering index of the fluorescent glass film is 66.5.

The XRD patterns of the fluorescent glass film and the corresponding phosphor prepared in example 1 are shown in fig. 2, and the fluorescent glass film has no impurity phase generated compared to the phosphor, and the original properties of the phosphor are not changed by doping the glass powder into the phosphor to prepare the fluorescent glass film;

the photograph of the laser white light source obtained in example 1 is shown in fig. 3, and it can be seen from fig. 3 that the light source formed of the fluorescent glass film prepared in example 1 emits high-brightness white light.

Example 2: a fluorescent glass film is prepared from 50 wt% of commercial K₂O-Na₂O-Al₂O₃-SiO₂Glass powder and 50 wt% of YAG: ce³⁺Yellow fluorescent powder.

Mixing commercial YAG: ce³⁺Commercial K of fluorescent powder₂O-Na₂O-Al₂O₃-SiO₂The glass powder comprises the following components in percentage by mass 1: 1, adding organic slurry, stirring to form gel, and respectively coating two layers of YAG: ce³⁺PiG and a layer of YAG: ce³⁺And (3) solidifying and molding the PiG on a heating table, placing the PiG in a muffle furnace, heating to the highest temperature of 750 ℃ at the room temperature of 25 ℃, preserving the heat for 10min, cooling to the room temperature of 25 ℃, and taking out to obtain the fluorescent glass film.

Prepared as in example 1The fluorescent glass film was compared to the single YAG: ce³⁺The optical performance comparison graph of the fluorescent glass film is shown in fig. 4, under the excitation of laser with the same power, the color temperature of the fluorescent glass film is 6880K, and the color rendering index is 73.8; single YAG: ce³⁺The color temperature of the fluorescent glass film is 6854K, and the color rendering index is 68.6. It can be seen that the color rendering property of the fluorescent glass film of the invention is improved to a certain extent.

Example 3: a fluorescent glass film is prepared from 50 wt% of commercial K₂O-Na₂O-Al₂O₃-SiO₂Glass powder and 50 wt% of YAGG Ce³⁺Yellow green phosphor, 50 wt% commercial K₂O-Na₂O-Al₂O₃-SiO₂Glass powder and 50 wt% of GdYAG Ce³⁺Orange fluorescent powder.

The commercial YAGG: Ce³⁺Phosphor and GdYAG Ce³⁺The fluorescent powder is respectively matched with commercial K₂O-Na₂O-Al₂O₃-SiO₂The glass powder comprises the following components in percentage by mass 1: 1, adding the organic slurry, stirring to form a gel, and respectively coating a layer of YAGG: ce³⁺PiG and two layers of GdYAG: ce³⁺And (3) solidifying and forming the PiG on a heating table, placing the PiG in a muffle furnace, heating to the highest temperature of 750 ℃ at the room temperature of 25 ℃ (the optimal sintering temperature is related to a glass powder matrix, and the glass powder used by the prepared sample is the same, so the sintering temperature is 750 ℃, keeping the temperature for 10min, cooling to the room temperature of 25 ℃, and taking out to obtain the fluorescent glass film. Finally, the color temperature of the obtained product is 6281K and the color rendering index is 68.8 through testing.

The invention can also have various embodiments, for example, the number of layers of the phosphor layer can be increased according to the requirement of the thickness of the phosphor layer, and yellow phosphor, red phosphor and the like can be replaced for each part of the above embodiments.