CN113387567B - Red fluorescent glass and preparation method thereof - Google Patents
Red fluorescent glass and preparation method thereof Download PDFInfo
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- CN113387567B CN113387567B CN202010176487.4A CN202010176487A CN113387567B CN 113387567 B CN113387567 B CN 113387567B CN 202010176487 A CN202010176487 A CN 202010176487A CN 113387567 B CN113387567 B CN 113387567B
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- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
- C03C4/00—Compositions for glass with special properties
- C03C4/12—Compositions for glass with special properties for luminescent glass; for fluorescent glass
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- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B19/00—Other methods of shaping glass
- C03B19/02—Other methods of shaping glass by casting molten glass, e.g. injection moulding
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- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
- C03C3/00—Glass compositions
- C03C3/04—Glass compositions containing silica
- C03C3/062—Glass compositions containing silica with less than 40% silica by weight
Abstract
The invention discloses red fluorescent glass and a preparation method thereof. The composition of the red fluorescent glass is (AEO)a(Y2O3)b(AM2O)c(SiO2)d(AZO2)e(Pr6O11)m(Er2O3)n(ii) a AE is selected from one or two of Mg or Ba elements; AM is selected from one or more of IA group metal elements; AZ is selected from one or more of group IVB metal elements or group IVA metal elements; wherein, d + e>0.5a+0.25b，0.5>a>0，1>b>0.3，0.6>c>0.001，0.8>d>0.01，0.5>e>0.001，0.5>m>0.0001，0.5>n>0.0001. The red fluorescent glass can emit red fluorescence under the excitation of blue light, and has higher light transmission and luminous intensity.
Description
Technical Field
The invention relates to red fluorescent glass and a preparation method thereof.
Background
The rare earth element can store and release light energy to emit light under the excitation of a light source due to the special electronic layer structure of the rare earth element. The rare earth element is added into the preparation of the luminescent glass, so that the luminescent glass with excellent luminescent performance can be obtained, and can be used as a packaging material of a white light LED lamp.
CN107010837A discloses a luminescent glass, the components of the glass comprise SrO and TiO2、SiO2The alkaline earth metal fluoride and the rare earth compound account for 20-35%, 10-20%, 0-60%, 5-15% and 0.01-5% in molar percentage; wherein the alkaline earth metal is Mg, Ca, Sr or Ba. The luminescent glass adopts rare earth ions with a special electronic layer structure, and the luminescent performance of the luminescent glass is improved.
CN1226213C discloses a method for preparing rare earth green long afterglow glass, which comprises alkali metal oxide, alkaline earth metal oxide, rare earth element, aluminum oxide, boron dioxide and silicon dioxide. The glass can emit green light under the excitation of ultraviolet light, and the long afterglow performance of the glass is improved.
CN1166863A discloses a red light emitting glass, which comprises 13-17 mol% of Tb2O322 to 26 mol% of B2O312 to 16 mol% of Ga2O3、3～7mol％、Eu2O33 to 7 mol% of Y2O313 to 17 mol% of GeO220 to 24 mol% of SiO20 to lmol% of Sb2O30.2 to 1 mol% of SnO2And 0.2 to lmol% of ZnO2。
The luminescent glass generally needs short-wave light with higher energy to be excited to emit fluorescence.
Disclosure of Invention
In view of the above, an object of the present invention is to provide a red fluorescent glass capable of emitting red fluorescence under excitation of blue light. Furthermore, the invention can reduce the absorption of the red fluorescent glass to visible light and improve the visible light transmittance and the luminous intensity of the red fluorescent glass.
Another object of the present invention is to provide a method for preparing the above red fluorescent glass, which is simple in operation and can stably prepare the red fluorescent glass.
In one aspect, the present invention provides a red fluorescent glass having a composition represented by formula (1):
(AEO)a(Y2O3)b(AM2O)c(SiO2)d(AZO2)e(Pr6O11)m(Er2O3)n (1)
wherein AE is selected from one or two of Mg or Ba elements; AM is selected from one or more of metals in the IA group; AZ is selected from one or more of group IVB metal elements or group IVA metal elements;
wherein a, b, c, d, e, m and n represent molar coefficients of the components and are not zero;
wherein d + e >0.5a +0.25b, 0.5> a >0, 1> b >0.3, 0.6> c >0.001, 0.8> d >0.01, 0.5> e >0.001, 0.5> m >0.0001, 0.5> n > 0.0001.
The red fluorescent glass provided by the invention is preferably capable of emitting red fluorescence under the excitation of blue light; wherein the wavelength of the blue light is 425-500 nm, and the wavelength of the red fluorescence is 580-660 nm.
According to the red fluorescent glass, preferably, the group IA metal is one of Li, Na or K; the metallic element of the IV B group is Ti or Zr; the group IVA metal element is Ge.
The red fluorescent glass according to the present invention preferably satisfies formula (2):
0.0002≥│m-n│≥0.00005 (2)。
the red fluorescent glass according to the present invention preferably satisfies formula (3):
0.5a+0.25b+0.25c＝d+e (3)。
according to the red fluorescent glass, preferably, AE is Mg, AM is Li, and AZ is Ti.
The red fluorescent glass according to the present invention preferably has a composition represented by one of the following formulas:
(MgO)0.15(Y2O3)0.68(Li2O)0.02(SiO2)0.24(TiO2)0.01(Pr6O11)0.0003(Er2O3)0.00025；
(MgO)0.05(Y2O3)0.88(Li2O)0.02(SiO2)0.24(GeO2)0.01(Pr6O11)0.0004(Er2O3)0.0002；
(BaO)0.05(Y2O3)0.88(Li2O)0.02(SiO2)0.24(GeO2)0.01(Pr6O11)0.0004(Er2O3)0.0005；
(BaO)0.15(Y2O3)0.68(Li2O)0.02(SiO2)0.24(TiO2)0.01(Pr6O11)0.0003(Er2O3)0.00025。
in another aspect, the present invention further provides a method for preparing the red fluorescent glass, which comprises the following steps:
mixing raw materials containing oxides shown as a formula (1) and a fluxing agent, placing the mixture in a heating device, and firing at 1000-1800 ℃ to obtain molten glass; and casting the molten glass into a mold, and annealing at 500-900 ℃ to obtain the red fluorescent glass.
According to the preparation method provided by the invention, preferably, the burning time is 2-10 h, and the annealing time is 1-8 h.
According to the preparation method of the present invention, preferably, the fluxing agent is selected from one or more of boric acid, lithium tetraborate, lithium metaborate and sodium tetraborate.
The invention adds Y2O3、Pr6O11And Er2O3Three kinds of specific rare earth oxides enable the red fluorescent glass to emit red fluorescence under the excitation of blue light. Furthermore, the invention reduces the absorption of the red fluorescent glass to visible light and improves the visible light transmittance and the luminous intensity of the red fluorescent glass.
Detailed Description
The present invention will be further described with reference to the following specific examples, but the scope of the present invention is not limited thereto.
< Red fluorescent glass >
The red fluorescent glass of the present invention has a composition represented by formula (1):
(AEO)a(Y2O3)b(AM2O)c(SiO2)d(AZO2)e(Pr6O11)m(Er2O3)n (1)。
the glass composition contains Y2O3、Pr6O11And Er2O3These components act synergistically with each other and are therefore capable of emitting red fluorescence upon excitation by blue light.
In the invention, AE is selected from one or two of Mg or Ba elements; preferably, AE is Mg. The molar coefficient of AEO is a. 0.5> a > 0; preferably, 0.3> a > 0.01; more preferably, 0.2> a > 0.04.
In the present invention, Y2O3The molar coefficient of (a) is b. 1>b>0.3; preferably, 0.9>b>0.5; more preferably, 0.9>b>0.6。
In the present invention, AM is selected from one or more of group ia metal elements. The group IA metal element contains Li, Na and K. Preferably, AM is selected from one or more of the elements Li, Na or K;more preferably, AM is Li. AM (amplitude modulation)2The molar coefficient of O is c. 0.6>c>0.001; preferably, 0.1>c>0.001; more preferably, 0.05>c>0.001. By adding AEO and AM within the above range2O, which helps to increase the emission intensity of the red fluorescence emitted under excitation by blue light.
In the present invention, SiO2The molar coefficient of (a) is d. 0.8>d>0.01, preferably 0.4>d>0.1; more preferably, 0.4>d>0.2。
In the present invention, AZ is selected from one or more of group ivb metal elements or group iva metal elements. The IVB group metal elements comprise Ti, Zr and Hf. The group IVA metal elements include Ge, Sn, Pb. Preferably, AZ is selected from one or more of the elements Ti, Zr and Ge; more preferably, AZ is selected from one of Ti and Ge elements. The molar coefficient of AZ is e. 0.5> e > 0.001; preferably, 0.1> e > 0.001; more preferably, 0.5> e > 0.001.
In the present invention, Pr6O11The molar coefficient of (a) is m. 0.5>m>0.0001; preferably, 0.01>m>0.0002; more preferably, 0.005>m>0.0002。
In the present invention, Er2O3The molar coefficient of (a) is n. 0.5>n>0.0001; preferably, 0.01>n>0.0001; more preferably, 0.001>n>0.0001。
The oxide component is selected to assist the red fluorescent glass to emit red fluorescence under the excitation of blue light. Further, the present invention controls the above oxide component within the above range, and can obtain higher visible light transmittance and luminous intensity.
According to one embodiment of the invention, the group ia metal is one of Li, Na or K; the metallic element of the IV B group is Ti or Zr; the group IVA metal element is Ge. Preferably, the group ia metal is Li; the metallic element of the IV B group is Ti; the group IVA metal element is Ge. According to one embodiment of the invention AE is Mg, AM is Li and AZ is Ti.
In the invention, the red fluorescent glass can emit red fluorescent light under the excitation of blue light. The wavelength of the blue light can be 425-500 nm; preferably, the maximum peak wavelength of the blue light is 435-495 nm. The wavelength of the red fluorescence can be 580-660 nm, and preferably, the maximum peak wavelength of the red fluorescence is 610-620 nm. The red fluorescent glass can emit red fluorescence under the excitation of blue light. Further, the purity of the emitted red fluorescence is high.
In the present invention, the red fluorescent glass satisfies formula (2):
0.0002≥│m-n│≥0.00005 (2)
preferably, m > n, and 0.0002. gtoreq.m-n.gtoreq.0.00005; more preferably, 0.0002. gtoreq.m-n.gtoreq.0.0001. The invention controls the oxide components in the range and controls the proportion of each oxide, thereby obtaining higher visible light transmittance and luminous intensity.
In the present invention, d + e >0.5a +0.25 b. By controlling the proportion of the components, higher visible light transmittance and higher luminous intensity can be obtained.
In the present invention, the red fluorescent glass satisfies formula (3):
0.5a+0.25b+0.25c＝d+e (3)
according to one embodiment of the invention, 0.5> a >0, 1> b >0.3, 0.6> c >0.001, 0.8> d >0.01, 0.5> e >0.001, 0.5> m >0.0001, 0.5> n >0.0001, 0.5a +0.25b +0.25c ≧ d + e, and 0.0002 ≧ m-n ≧ 0.00005.
According to yet another embodiment of the invention, 0.2> a >0, 0.9> b >0.5, 0.1> c >0.01, 0.5> d >0.1, 0.1> e >0.005, 0.1> m >0.0002, 0.01> n >0.0002, 0.5a +0.25b +0.25c ≧ d + e, and 0.0002 ≧ m-n ≧ 0.0001.
According to one embodiment of the present invention, the red fluorescent glass of the present invention includes, but is not limited to, a composition of one of the following formulas:
(MgO)0.15(Y2O3)0.68(Li2O)0.02(SiO2)0.24(TiO2)0.01(Pr6O11)0.0003(Er2O3)0.00025；
(MgO)0.05(Y2O3)0.88(Li2O)0.02(SiO2)0.24(GeO2)0.01(Pr6O11)0.0004(Er2O3)0.0002；
(BaO)0.05(Y2O3)0.88(Li2O)0.02(SiO2)0.24(GeO2)0.01(Pr6O11)0.0004(Er2O3)0.0005；
(BaO)0.15(Y2O3)0.68(Li2O)0.02(SiO2)0.24(TiO2)0.01(Pr6O11)0.0003(Er2O3)0.00025。
in some embodiments, the red fluorescent glass of the present invention does not include additional components other than inevitable impurities.
< preparation method >
The preparation method of the red fluorescent glass comprises the following steps: mixing raw materials containing oxides shown as a formula (1) with a fluxing agent, and putting the mixture into a heating device to be fired to obtain molten glass; and casting the molten glass into a mold for annealing to obtain the red fluorescent glass. The respective oxides represented by the formula (1) and the contents thereof are as described above and will not be described herein again. Optionally, the raw materials are mixed, ground and then placed in a heating device for burning.
In the invention, the firing temperature is 1000-1800 ℃; preferably, the firing temperature is 1200-1600 ℃; more preferably, the burning temperature is 1400-1600 ℃. Firing time is 2-10 h; preferably, the burning time is 3-8 h; more preferably, the burning time is 4-6 h. Experiments prove that the burning conditions can assist in improving the luminous intensity of the red fluorescent glass.
In the invention, the annealing temperature is 500-900 ℃; preferably, the annealing temperature is 600-900 ℃; more preferably, the annealing temperature is 600-800 ℃. The annealing time is 1-8 h; preferably, the annealing time is 2-6 h; more preferably, the annealing time is 4-6 h. By adopting the preparation conditions, the material of the red fluorescent glass can be more uniform, and the luminous visible light transmittance is improved.
The fluxing agent of the invention can be selected from one or more of boric acid, lithium tetraborate, lithium metaborate and sodium tetraborate; preferably, the fluxing agent is selected from one or more of boric acid, lithium tetraborate, lithium metaborate; more preferably, the fluxing agent is boric acid. The fluxing agent is adopted, so that the optical performance of the red fluorescent glass is prevented from being influenced.
Annealing treatment is carried out in an inert atmosphere; preferably, the annealing treatment is carried out in a nitrogen atmosphere; more preferably, the annealing treatment is performed in a nitrogen atmosphere obtained after the evacuation treatment and the nitrogen refilling treatment are performed. Annealing treatment is carried out in the atmosphere, so that the influence of impurities introduced in the annealing process on the luminous performance of the red fluorescent glass is avoided.
AE is selected from one or two of Mg or Ba elements. The raw material of AEO may be selected from one or more of metals AE, oxides of AE, carbonates of AE, nitrates of AE, sulfates of AE, oxalates of AE, halides of AE, and hydroxides of AE. Preferably, the raw material of AEO is selected from one or more of an oxide of AE, a carbonate of AE, a halide of AE, and a hydroxide of AE. More preferably, the raw material of AEO is selected from the oxides of AE.
Y2O3The raw material of (a) may be selected from one or more of rare earth metal yttrium, yttrium oxide, yttrium carbonate, yttrium nitrate, yttrium sulfate, yttrium oxalate, halides of yttrium, and yttrium hydroxide. Preferably, Y2O3The raw material of (A) is selected from one or more of yttrium oxide, yttrium carbonate, yttrium halide and yttrium hydroxide. More preferably, Y2O3Is selected from yttrium carbonate.
AM is selected from one or more of group IA metal elements. AM (amplitude modulation)2The O raw material can be selected from metal AM, AM oxide, AM carbonate, AM nitrate, AM sulfate, AM oxalate, and AM chlorideAnd a hydroxide of AM. Preferably, AM2The raw material of O is selected from one or more of AM oxide, AM carbonate, AM chloride and AM hydroxide. More preferably, AM2The starting material for O is selected from the chlorides of AM.
SiO2The raw material of (A) may be selected from one or more of silicon dioxide, orthosilicic acid, metasilicic acid, silane, silicon tetrahalide, silicon nitride, aminosilicone, fluorosilicic acid. Preferably, SiO2The raw material is selected from one or more of silicon dioxide, silane, amino silicon and fluosilicic acid. More preferably, SiO2The raw material of (a) is selected from silica. The raw materials can make the preparation process easier to operate, and improve the visible light transmittance and the luminous intensity of the red fluorescent glass.
AZ is selected from one or more of group IVB metal elements or group IVA metal elements. AZO2The starting material of (a) may be selected from one or more of the metals AZ, oxides of AZ, carbonates of AZ, nitrates of AZ, sulfates of AZ, oxalates of AZ, halides of AZ and hydroxides of AZ. Preferably AZO2Is selected from one or more of metal AZ, oxide of AZ, carbonate of AZ, halide of AZ and hydroxide of AZ. More preferably, AZO2Is selected from one or more of oxides of AZ, halides of AZ and hydroxides of AZ.
Pr6O11The raw material of (a) may be selected from one or more of rare earth metal praseodymium, praseodymium oxide, praseodymium carbonate, praseodymium nitrate, praseodymium sulfate, praseodymium oxalate, halide of praseodymium and praseodymium hydroxide. Preferably, Pr6O11The raw material of (A) is selected from one or more of praseodymium oxide, praseodymium carbonate, praseodymium halide and praseodymium hydroxide. More preferably, Pr6O11The raw material of (A) is selected from one or more of praseodymium oxide, praseodymium carbonate and praseodymium halide.
Er2O3The raw material is selected from one or more of rare earth metal erbium, erbium oxide, erbium carbonate, erbium nitrate, erbium sulfate, erbium oxalate, erbium halide and erbium hydroxide. Preferably, Er2O3The raw material is selected from erbium oxide and carbonic acidOne or more of erbium, erbium halide and erbium hydroxide. More preferably, Er2O3The raw material of (1) is erbium oxide.
According to one embodiment of the invention, the raw material of AEO is chloride or carbonate of AE; y is2O3The raw material of (A) is yttrium oxide or yttrium carbonate; AM (amplitude modulation)2The raw material of O is carbonate or chloride of AM; SiO 22The raw material of (A) is silicon dioxide; AZO2The raw material of (A) is an oxide of metal AZ; pr (Pr) of6O11The raw material of (A) is praseodymium oxide; er2O3The raw material of (1) is erbium oxide. The invention adopts the raw materials, can not influence the luminescent property of the red fluorescent glass, has simpler operation and is easier to mix evenly.
The detection method of the red fluorescent glass sample obtained in each example is described below.
The wavelength range and the maximum peak value of the emitted light are detected by taking blue light as an excitation light source. The wavelength range of the excitation light source is 425-500 nm, and the maximum peak value is 435-495 nm.
Relative luminous intensity: the red fluorescent glass sample prepared in example 1 was excited with 460nm blue light as an excitation light source, and the generated fluorescence was collected and converted into an electrical signal by a photodetector, and then its relative luminous intensity was indicated by detecting its photocurrent value. The photocurrent values of the red fluorescent glass samples prepared in examples 2 to 4 were measured under the same conditions to respectively represent the relative luminous intensities thereof, and the relative luminous intensity of example 1 was set to 100%, thereby calculating the relative luminous intensities of the red fluorescent glass samples prepared in examples 2 to 4.
Visible light transmittance: the red fluorescent glass sample to be detected prepared in the following embodiment is irradiated by a light source with adjustable wavelength, the sensor respectively detects the incident light intensity (reference light) of the light source and the transmitted light intensity after transmitting the red fluorescent glass sample to be detected, and the ratio of the transmitted light intensity to the incident light intensity is the transmittance and is expressed by percentage.
Example 1
Weighing MgCO according to the proportion in Table 13(analytical grade), Y2(CO3)3(99.99 wt%), LiCl (analytical grade), SiO2(analytically pure), TiO2(analytically pure), Pr6O11(99.99wt％)、Er2O3(99.99 wt.%) as the starting material. These raw materials were mixed with boric acid (specification of analytical grade, amount of 4 wt% based on the total weight of the raw materials), thoroughly ground and mixed well. Then, the glass melt was obtained by burning the glass melt at 1550 ℃ for 4 hours in a high-temperature resistance furnace. And (3) casting the glass melt into a mold, annealing at 800 ℃ for 4h under the protection of nitrogen, and cooling to room temperature to obtain the red fluorescent glass sample. See table 2 for properties.
Example 2
Adding TiO into the mixture2(analytically pure) replacement by GeO2(analytical purity) and the amounts of the respective raw materials were changed, and the other conditions were the same as in example 1. See table 2 for properties.
Example 3
Changing Er2O3The amounts of the raw materials and other conditions were the same as in example 2. See table 2 for properties.
Example 4
MgCO is mixed with3(analytically pure) replacement by BaCO3(analytically pure), the remaining conditions were the same as in example 1. See table 2 for properties.
TABLE 1
| Serial number | Composition formula of red fluorescent glass |
| Example 1 | (MgO)0.15(Y2O3)0.68(Li2O)0.02(SiO2)0.24(TiO2)0.01(Pr6O11)0.0003(Er2O3)0.00025 |
| Example 2 | (MgO)0.05(Y2O3)0.88(Li2O)0.02(SiO2)0.24(GeO2)0.01(Pr6O11)0.0004(Er2O3)0.0002 |
| Example 3 | (MgO)0.05(Y2O3)0.88(Li2O)0.02(SiO2)0.24(GeO2)0.01(Pr6O11)0.0004(Er2O3)0.0005 |
| Example 4 | (BaO)0.15(Y2O3)0.68(Li2O)0.02(SiO2)0.24(TiO2)0.01(Pr6O11)0.0003(Er2O3)0.00025 |
TABLE 2
The present invention is not limited to the above-described embodiments, and any variations, modifications, and substitutions which may occur to those skilled in the art may be made without departing from the spirit of the invention.
Claims (10)
1. A red fluorescent glass characterized in that it has a composition represented by formula (1):
(AEO)a(Y2O3)b(AM2O)c(SiO2)d(AZO2)e(Pr6O11)m(Er2O3)n (1)
wherein AE is selected from one or two of Mg or Ba elements; AM is selected from one or more of metals in the IA group; AZ is selected from one or more of group IVB metal elements or group IVA metal elements;
wherein a, b, c, d, e, m and n represent molar coefficients of the components and are not zero;
wherein d + e >0.5a +0.25b, 0.5> a >0.01, 1> b >0.3, 0.1> c >0.001, 0.8> d >0.01, 0.1> e >0.001, 0.005> m >0.0002, 0.001> n > 0.0001.
2. The red fluorescent glass of claim 1, wherein the red fluorescent glass is capable of emitting red fluorescent light upon excitation with blue light; wherein the wavelength of the blue light is 425-500 nm, and the wavelength of the red fluorescence is 580-660 nm.
3. The red fluorescent glass of claim 1, wherein the group ia metal is one of Li, Na or K; the metallic element of the IV B group is Ti or Zr; the group IVA metal element is Ge.
4. The red fluorescent glass according to claim 1, wherein the red fluorescent glass satisfies formula (2):
0.0002≥│m-n│≥0.00005 (2)。
5. the red fluorescent glass according to claim 1, wherein the red fluorescent glass satisfies formula (3):
0.5a+0.25b+0.25c＝d+e (3)。
6. the red fluorescent glass according to any one of claims 1 to 5, wherein AE is Mg, AM is Li, and AZ is Ti.
7. The red fluorescent glass according to claim 1, wherein the red fluorescent glass has a composition represented by one of the following formulae:
(MgO)0.15(Y2O3)0.68(Li2O)0.02(SiO2)0.24(TiO2)0.01(Pr6O11)0.0003(Er2O3)0.00025；
(MgO)0.05(Y2O3)0.88(Li2O)0.02(SiO2)0.24(GeO2)0.01(Pr6O11)0.0004(Er2O3)0.0002；
(BaO)0.05(Y2O3)0.88(Li2O)0.02(SiO2)0.24(GeO2)0.01(Pr6O11)0.0004(Er2O3)0.0005；
(BaO)0.15(Y2O3)0.68(Li2O)0.02(SiO2)0.24(TiO2)0.01(Pr6O11)0.0003(Er2O3)0.00025。
8. the method for preparing red fluorescent glass according to any one of claims 1 to 7, characterized by comprising the steps of:
mixing raw materials containing oxides shown as a formula (1) and a fluxing agent, placing the mixture in a heating device, and firing at 1000-1800 ℃ to obtain molten glass; and casting the molten glass into a mold, and annealing at 500-900 ℃ to obtain the red fluorescent glass.
9. The method according to claim 8, wherein the burning time is 2 to 10 hours, and the annealing time is 1 to 8 hours.
10. The method of claim 8, wherein the fluxing agent is selected from one or more of boric acid, lithium tetraborate, lithium metaborate, and sodium tetraborate.
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