Cordierite crystal-doped tellurite fluorescent glass and its preparation method and application

Abstract

The present invention provides a cordierite crystal-doped tellurite fluorescent glass, its preparation method, and application, belonging to the field of white light laser lighting technology. The fluorescent glass raw materials of the present invention include rare earth phosphor and precursor glass powder. The precursor glass powder raw materials include 60-70% TeO2, 10-20% ZnO, 10-20% Na2O, and 0-10% Al2O3. The rare earth phosphor, calculated as a percentage by mass of the precursor glass powder, includes 0-12% yttrium aluminum garnet phosphor and 0-5% cordierite crystal. The precursor glass powder raw materials are mixed and ground uniformly, then melted and cast to obtain the precursor glass powder. The precursor glass powder is then mixed uniformly with the yttrium aluminum garnet phosphor and cordierite crystals, melted a second time, solidified, and annealed to obtain the precursor glass powder. The tellurite fluorescent glass of the present invention exhibits efficient luminescence while retaining the ductility of traditional glass, exhibits good thermal stability, and has a simple production process.

Description

Technical Field

[0001] The present invention belongs to the technical field of white light laser lighting, and in particular relates to a cordierite crystal-doped tellurite fluorescent glass and a preparation method and application thereof. Background Art

[0002] Amidst the current global energy shortage, semiconductor solid-state light sources are gradually replacing traditional light sources with their advantages of high luminous efficiency, low power consumption, long life, and environmental friendliness. Solid-state light source technology is currently developing towards high power and high density, resulting in the emergence of multi-chip integrated white light emitting diode (LED) light sources and next-generation white light laser diode (LD) light sources. Currently, white light illumination typically utilizes a blue light chip to excite a yellow phosphor. Therefore, improving the photothermal performance of yellow phosphors and the phosphor conversion materials they comprise could significantly advance the development of white light illumination technology.

[0003] Currently, phosphor conversion materials primarily include single crystals, fluorescent glass, and fluorescent ceramics. However, the high temperatures generated by high-power blue laser chips excite traditional fluorescent ceramics and glass, making them susceptible to cracking, reduced luminous efficiency, and thermal quenching of the phosphor. The high difficulty and cost of single crystal production limit their large-scale application. Heat dissipation methods such as external heat sinks and the use of highly thermally conductive substrates undoubtedly increase the cost and bulk of lighting devices, all of which seriously affect the photothermal performance of white light laser lighting.

[0004] In the prior art, researchers have combined silicate glass with phosphors to prepare fluorescent glass, and then heat-treated the fluorescent glass at high temperature to precipitate microcrystals to enhance the optical and thermal properties of the fluorescent glass. 18 It has a special crystal structure, showing a low thermal expansion coefficient and good thermal shock resistance. However, due to the high melting temperature of borosilicate glass, the preparation of silicate fluorescent glass requires a temperature of thousands of degrees Celsius, which places high demands on the preparation process. In addition, the high temperature damages the phosphor during the preparation process. In addition, the lower refractive index of borosilicate does not match the refractive index of the phosphor, resulting in reflection and scattering that is not conducive to light propagation. The finished product has limited improvement in white light performance. Tellurite glass has a relatively low melting temperature and a high refractive index that is compatible with commercial phosphors, making it very suitable for use as a fluorescent conversion material. However, due to the high thermal expansion coefficient of tellurite glass, the rapid heating under high-power laser irradiation causes the glass to expand and shatter, which limits the application of tellurite fluorescent glass in the field of laser lighting.

[0005] Therefore, how to simply and efficiently combine the high refractive index and low melting point of tellurite fluorescent glass with the excellent mechanical properties of silicate to prepare a composite fluorescent glass material is a technical problem that technicians in this field urgently need to solve. Summary of the Invention

[0006] In order to solve the above technical problems, the present invention proposes a cordierite crystal-doped tellurite fluorescent glass and a preparation method and application thereof.

[0007] To achieve the above object, the present invention provides a cordierite crystal-doped tellurite fluorescent glass, the raw materials of which include rare earth phosphor and precursor glass powder, wherein the precursor glass powder comprises, in mole percentage, 60-70% TeO2, 10-20% ZnO, 10-20% Na2O and 0-10% Al2O3;

[0008] The rare earth phosphor comprises 0-12% of yttrium aluminum garnet phosphor and 0-5% of cordierite crystal (the content of cordierite crystal is not 0) based on the mass percentage of the precursor glass powder.

[0009] Furthermore, the precursor glass powder comprises, in terms of molar percentage, 65% TeO2, 15% ZnO, 15% Na2O and 5% Al2O3;

[0010] The rare earth phosphor comprises 12% of yttrium aluminum garnet phosphor and 3% of cordierite crystal based on the mass percentage of the precursor glass powder.

[0011] Furthermore, the cordierite crystal is cordierite Mg2Al4Si5O 18 crystal.

[0012] Furthermore, the cordierite Mg2Al4Si5O 18 The crystals are composed of 20% MgO, 20% Al2O3 and 60% SiO2 in terms of molar percentage. The preparation method comprises the following steps:

[0013] After mixing the raw materials, the mixture was heated at 1600°C for 1 hour, cooled to room temperature, and then heated again at 1200°C for 3 hours. After cooling to room temperature again, the mixture was ground into crystals with a particle size of less than 1-100 μm.

[0014] Among fluorescent glasses, tellurite glass has the advantage of having a lower melting temperature and a higher refractive index than silicate glass systems in addition to high thermal stability. In the field of white light illumination, the above advantages of tellurite glass are very suitable for use in composite yellow phosphors (yttrium aluminum garnet phosphors, yellow type). In addition, cordierite Mg2Al4Si5O with a low thermal expansion coefficient 18 Crystals can enhance the mechanical properties of glass materials, have a low light absorption coefficient, and have good reflection effects. They are very suitable as light scattering centers, improving the luminescence and laser damage resistance threshold of materials.

[0015] The present invention also proposes a method for preparing the cordierite crystal-doped tellurite fluorescent glass, comprising the following steps:

[0016] TeO2, ZnO, Na2O and Al2O3 are ground evenly, melted for the first time, cast into shape, and ground to obtain a precursor glass powder. The precursor glass powder is mixed evenly with yttrium aluminum garnet phosphor and cordierite crystals, and melted for a second time to obtain a mixed glass liquid. The mixed glass liquid is solidified into shape and annealed to obtain the cordierite crystal-doped tellurite fluorescent glass.

[0017] Furthermore, the temperature of the first melting is 900° C. and the time is 40 minutes.

[0018] Furthermore, the temperature of the second melting is 600° C. and the time is 20 minutes.

[0019] The purpose of the second melting process is to shorten the time that the phosphor is exposed to high temperature, lower the preparation temperature of the phosphor glass, and reduce the damage to the crystal structure of the phosphor caused by high temperature.

[0020] Furthermore, the solidification molding temperature is 400°C.

[0021] Furthermore, the annealing treatment temperature is 300° C. and the holding time is 3 hours.

[0022] The present invention also proposes the application of the cordierite crystal-doped tellurite fluorescent glass in white light laser lighting.

[0023] Compared with the prior art, the present invention has the following advantages and technical effects:

[0024] The cordierite crystal-doped tellurite fluorescent glass of the present invention exhibits highly efficient luminescence while retaining the ductility of traditional glass. It also exhibits excellent thermal stability, a simple and environmentally friendly manufacturing process, and low production costs, making it easy to produce high-optical-quality glass. Furthermore, the cordierite crystal content introduced into the tellurite glass reaches up to 5% by weight, enhancing mechanical properties while also acting as scattering centers. This significantly increases the luminescence intensity and laser damage threshold of the resulting cordierite crystal-doped tellurite fluorescent glass. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The accompanying drawings, which constitute part of this application, are intended to provide a further understanding of this application. The exemplary embodiments and descriptions of this application are intended to explain this application and do not constitute an improper limitation on this application. In the accompanying drawings:

[0026] Figure 1 XRD patterns of the tellurite fluorescent glass materials obtained in Example 1 and Example 2;

[0027] Figure 2 The fluorescence spectra of the tellurite fluorescent glass materials obtained in Examples 3 to 5 and Comparative Example 1 are shown;

[0028] Figure 3 The thermal expansion coefficient test results of the tellurite fluorescent glass materials obtained in Examples 3 to 5 and Comparative Example 1 in the range of room temperature to 250°C are shown;

[0029] Figure 4 The luminous efficiency and laser irradiation threshold test results of the tellurite fluorescent glasses obtained in Comparative Examples 1-2 and Examples 3-5 are shown;

[0030] Figure 5 The following are actual pictures of the tellurite fluorescent glasses obtained in Comparative Example 1 and Examples 3 to 5 under white light irradiation. DETAILED DESCRIPTION

[0031] Various exemplary embodiments of the present invention will now be described in detail. This detailed description should not be considered as limiting the present invention, but rather as a more detailed description of certain aspects, features, and embodiments of the present invention.

[0032] It should be understood that the terms described herein are intended only to describe particular embodiments and are not intended to limit the present invention. In addition, for numerical ranges herein, it should be understood that each intermediate value between the upper and lower limits of the range is also specifically disclosed. Each smaller range between any intermediate value within a stated value or stated range and any other stated value or intermediate value within the stated range is also encompassed by the present invention. The upper and lower limits of these smaller ranges may be independently included or excluded within the scope.

[0033] Unless otherwise indicated, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art. Although only preferred methods and materials are described herein, any methods and materials similar or equivalent to those described herein may also be used in the practice or testing of the present invention. All documents mentioned in this specification are incorporated by reference to disclose and describe the methods and / or materials associated with the documents. In the event of any conflict with any incorporated document, the contents of this specification shall prevail.

[0034] It will be apparent to those skilled in the art that various modifications and variations may be made to the specific embodiments described herein without departing from the scope or spirit of the invention. Other embodiments will be apparent to those skilled in the art from the description of the invention. The description and examples are intended to be illustrative only.

[0035] The words “include,” “including,” “have,” “contain,” etc. used in this document are open-ended terms, meaning including but not limited to.

[0036] The embodiment of the present invention provides a cordierite crystal-doped tellurite fluorescent glass, the raw materials of which include rare earth phosphor and precursor glass powder, wherein the precursor glass powder comprises, in mole percentage, 60-70% TeO2, 10-20% ZnO, 10-20% Na2O, and 0-10% Al2O3;

[0037] The rare earth phosphor comprises 0-12% of yttrium aluminum garnet phosphor and 0-5% of cordierite crystal (the content of cordierite crystal is not 0) based on the mass percentage of the precursor glass powder.

[0038] In a preferred embodiment of the present invention, the precursor glass powder comprises, in terms of molar percentage, 65% TeO2, 15% ZnO, 15% Na2O and 5% Al2O3;

[0039] The rare earth phosphor comprises 12% of yttrium aluminum garnet phosphor and 3% of cordierite crystal based on the mass percentage of the precursor glass powder.

[0040] In a preferred embodiment of the present invention, the cordierite crystal is cordierite Mg2Al4Si5O 18 Crystal, the cordierite Mg2Al4Si5O 18 The crystals are composed of 20% MgO, 20% Al2O3 and 60% SiO2 in terms of molar percentage. The preparation method comprises the following steps:

[0041] After mixing the raw materials, the mixture was heated at 1600°C for 1 hour, cooled to room temperature, and then heated again at 1200°C for 3 hours. After cooling to room temperature again, the mixture was ground into crystals with a particle size of less than 1-100 μm.

[0042] Cordierite Mg2Al4Si5O 18 The amount of crystal added cannot exceed the specified range, otherwise the transparency of the fluorescent glass will be reduced and the luminescence will be poor because the glass network formation is not dense enough.

[0043] The embodiment of the present invention further provides a method for preparing the cordierite crystal-doped tellurite fluorescent glass, comprising the following steps:

[0044] TeO2, ZnO, Na2O and Al2O3 are ground evenly, melted for the first time, cast into shape, and ground to obtain a precursor glass powder. The precursor glass powder is mixed evenly with yttrium aluminum garnet phosphor and cordierite crystals, and melted for a second time to obtain a mixed glass liquid. The mixed glass liquid is solidified into shape and annealed to obtain the cordierite crystal-doped tellurite fluorescent glass.

[0045] In a preferred embodiment of the present invention, the temperature of the first melting is 900° C. and the time is 40 minutes.

[0046] In a preferred embodiment of the present invention, the temperature of the second melting is 600° C. and the time is 20 minutes.

[0047] The purpose of the second melting process is to shorten the time that the phosphor is exposed to high temperature, lower the preparation temperature of the phosphor glass, and reduce the damage to the crystal structure of the phosphor caused by high temperature.

[0048] In a preferred embodiment of the present invention, the solidification molding temperature is 400°C.

[0049] In a preferred embodiment of the present invention, the annealing temperature is 300° C. and the holding time is 3 hours.

[0050] In a preferred embodiment of the present invention, the mixed glass liquid is clear, uniform and bubble-free glass liquid.

[0051] The embodiment of the present invention further proposes the application of the cordierite crystal-doped tellurite fluorescent glass in white light laser lighting.

[0052] The raw materials used in the examples of the present invention were all purchased from commercial sources.

[0053] Unless otherwise specified, the "room temperature" described in the embodiments of the present invention is within the range of 20-30°C.

[0054] The technical solution of the present invention is further illustrated by the following examples.

[0055] Example 1

[0056] A cordierite Mg2Al4Si5O 18 A method for preparing a crystal-doped tellurite fluorescent glass material comprises the following steps:

[0057] (1) Weigh the following raw materials in molar percentage: MgO 20%, Al2O3 20% and SiO2 60%; cordierite Mg2Al4Si5O 18 The method for preparing the crystal comprises the following steps:

[0058] The raw materials were mixed and heated at 1600℃ for 1 hour, cooled to room temperature, and then heated again at 1200℃ for 3 hours. After cooling to room temperature again, the mixture was ground into cordierite Mg2Al4Si5O with a particle size of 1~100μm. 18 crystals;

[0059] (2) Weigh the rare earth phosphor and precursor glass powder raw materials as shown in Table 1;

[0060] (3) TeO2, ZnO, Na2O and Al2O3 are mixed and ground evenly, placed in an alumina crucible, and placed in a silicon carbon rod electric furnace at 900°C for melting (first melting) for 40 minutes to obtain glass liquid. The above glass liquid is poured into a 400°C mold to solidify and form. Then, it is quickly transferred to a muffle furnace that has been heated to 400°C, kept warm for 3 hours, and then cooled to room temperature to obtain precursor glass and grind it to obtain precursor glass powder with fine particles and uniform size;

[0061] (4) The obtained precursor glass powder is mixed with cordierite Mg2Al4Si5O 18 The crystals were mixed evenly and poured into a crucible. The mixture was melted in a silicon carbon rod electric furnace at 600°C (second melting) for 20 minutes to obtain a mixed glass liquid. The mixed glass liquid was poured into a mold preheated to 400°C to solidify and form. The mixture was quickly transferred to a muffle furnace heated to 400°C and kept warm for 3 hours before being cooled to room temperature to obtain cordierite Mg2Al4Si5O 18 Crystal-doped tellurite fluorescent glass material.

[0062] Example 2

[0063] A cordierite Mg2Al4Si5O 18 A method for preparing a crystal-doped tellurite fluorescent glass material comprises the following steps:

[0064] (1) Weigh the following raw materials in molar percentage: MgO 20%, Al2O3 20% and SiO2 60%; cordierite Mg2Al4Si5O 18 The method for preparing the crystal comprises the following steps:

[0065] The raw materials were mixed and heated at 1600℃ for 1 hour, cooled to room temperature, and then heated again at 1200℃ for 3 hours. After cooling to room temperature again, the mixture was ground into cordierite Mg2Al4Si5O with a particle size of 1~100μm. 18 crystals;

[0066] (2) Weigh the rare earth phosphor and precursor glass powder raw materials as shown in Table 1;

[0067] (3) The precursor glass powder raw materials TeO2, ZnO and Na2O are mixed and ground evenly, placed in an alumina crucible, and placed in a silicon carbon rod electric furnace at 900℃ for melting (first melting) for 40 minutes to obtain glass liquid. The above glass liquid is poured into a 400℃ mold to solidify and form. Then, it is quickly transferred to a muffle furnace that has been heated to 400℃, kept warm for 3 hours, and then cooled to room temperature to obtain precursor glass and grind it to obtain precursor glass powder with fine particles and uniform size;

[0068] (4) The obtained precursor glass powder is mixed with yttrium aluminum garnet phosphor and cordierite Mg2Al4Si5O 18 The crystals were mixed evenly and poured into a crucible. The mixture was melted in a silicon carbon rod electric furnace at 600°C (second melting) for 20 minutes to obtain a mixed glass liquid. The mixed glass liquid was poured into a mold preheated to 400°C to solidify and form. The mixture was quickly transferred to a muffle furnace heated to 400°C and kept warm for 3 hours before being cooled to room temperature to obtain cordierite Mg2Al4Si5O 18 Crystal-doped tellurite fluorescent glass material.

[0069] Example 3

[0070] Weigh the rare earth phosphor and precursor glass powder raw materials as shown in Table 1;

[0071] The remaining steps are the same as those in Example 2.

[0072] Example 4

[0073] Weigh the rare earth phosphor and precursor glass powder raw materials as shown in Table 1;

[0074] The remaining steps are the same as those in Example 2.

[0075] Example 5

[0076] Weigh the rare earth phosphor and precursor glass powder raw materials as shown in Table 1;

[0077] The remaining steps are the same as those in Example 2.

[0078] Comparative Example 1

[0079] A cordierite-free Mg2Al4Si5O 18 A method for preparing a crystal-doped tellurite fluorescent glass material comprises the following steps:

[0080] (1) Weigh the rare earth phosphor and precursor glass powder raw materials as shown in Table 1;

[0081] (2) TeO2, ZnO, Na2O and Al2O3 are mixed and ground evenly, placed in an alumina crucible, and placed in a silicon carbon rod electric furnace at 900°C for melting (first melting) for 40 minutes to obtain glass liquid. The above glass liquid is poured into a 400°C mold to solidify and form, and then quickly transferred to a muffle furnace that has been heated to 400°C. After keeping the temperature for 3 hours, it is cooled to room temperature to obtain a precursor glass and grind it to obtain a precursor glass powder with fine particles and uniform size;

[0082] (3) The obtained precursor glass powder and yttrium aluminum garnet phosphor powder were mixed evenly and poured into a crucible. The mixture was placed in a silicon carbon rod electric furnace at 600 ° C for 20 minutes to obtain a mixed glass liquid. The mixed glass liquid was poured into a mold preheated to 400 ° C for solidification and quickly transferred to a muffle furnace heated to 400 ° C. After keeping the temperature for 3 hours and then cooling to room temperature, Mg2Al4Si5O without cordierite was obtained. 18 Crystal-doped tellurite fluorescent glass material.

[0083] Comparative Example 2

[0084] Weigh the rare earth phosphor and precursor glass powder raw materials as shown in Table 1;

[0085] The remaining steps are the same as those in Example 4.

[0086] Table 1 Amount of each raw material in Examples 1-5 and Comparative Examples 1-2

[0087]

[0088] Performance tests were performed on the tellurite fluorescent glass materials obtained in Examples 1-5 and Comparative Examples 1-2.

[0089] (1) XRD pattern

[0090] Using Cu~K α The XRD patterns of the tellurite fluorescent glass materials obtained in Example 1 and Example 2 are shown in FIG. Figure 1 As shown. It can be seen that Example 1 and cordierite Mg2Al4Si5O 18 The characteristic peaks shown on the crystal standard card are completely consistent, proving that cordierite has been successfully synthesized. In Example 2, yttrium aluminum garnet phosphor (Y3Al5O 12 ) and cordierite Mg2Al4Si5O 18 The crystal phase of cordierite Mg2Al4Si5O 18 The crystals do not introduce impurities and the phosphor crystals are not damaged.

[0091] (2) Fluorescence spectrum

[0092] The fluorescence spectra of the tellurite fluorescent glass materials obtained in Examples 3 to 5 and Comparative Examples 1 to 2 were tested under 450 nm wavelength laser diode pumping. Figure 2 As shown. Under the pumping of a laser diode with a wavelength of 450nm, broadband light emission with a central wavelength of 540nm is obtained. It can be seen that due to the cordierite Mg2Al4Si5O 18 The crystal plays the role of a scattering center, and its introduction significantly improves the emission intensity of the tellurite fluorescent glass material.

[0093] (3) Thermal expansion coefficient test

[0094] The thermal expansion coefficient of the tellurite fluorescent glass materials obtained in Examples 3 to 5 and Comparative Example 1 was tested in the range of room temperature to 250°C using a thermal expansion meter. Figure 3 As shown. It can be seen that with the increase of cordierite Mg2Al4Si5O 18 With the increase of crystal content, the thermal expansion coefficient has been significantly reduced.

[0095] (4) Luminous efficiency and laser irradiation threshold test

[0096] The tellurite fluorescent glasses obtained in Comparative Examples 1-2 and Examples 3-5 were tested for luminous efficiency and laser irradiation threshold. The results are shown in Table 1. Figure 4 ,Depend on Figure 4 It can be seen that under 450nm blue laser irradiation, cordierite Mg2Al4Si5O 18 The introduction of crystals reduces the thermal expansion coefficient of the material and enhances the mechanical properties, making the material more difficult to break under high-power laser irradiation. The sample of Example 4 has the best luminous efficiency and laser irradiation threshold. Compared with Comparative Example 1, this cordierite Mg2Al4Si5O 18 The maximum laser power density that the crystal-doped tellurite fluorescent glass can withstand has increased by 21% to 6.6W / mm 2 At a laser power density of 100 nm, the luminous efficiency is increased by 5.17 times at most.

[0097] When cordierite Mg2Al4Si5O 18 When the crystal content is higher than 5% (Comparative Example 2), the transmittance of the sample in visible light is significantly reduced, and the thermal aggregation effect becomes more serious under laser irradiation, resulting in thermal quenching of the phosphor and a decrease in luminescence performance.

[0098] (5) Sample photos

[0099] The tellurite fluorescent glass obtained in Comparative Example 1 and Examples 3 to 5 was photographed under white light. Figure 5 As shown, the sample is intact and uniform. However, excessive transparency causes the excitation light source to directly penetrate the glass, preventing effective scattering and uniform light distribution (Comparative Example 1). Therefore, when designing and preparing fluorescent glass, it is necessary to comprehensively consider the balance between scattering and transparency. Cordierite particles act as scatterers, dispersing incident light, causing it to be reflected and refracted multiple times within the fluorescent glass, enhancing the phosphor's absorption and conversion of the excitation light source, thereby achieving higher luminous efficiency.

[0100] The above are merely preferred embodiments of the present application, but the scope of protection of the present application is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in this application should be included in the scope of protection of the present application. Therefore, the scope of protection of the present application should be based on the scope of protection of the claims.

Claims

1. A cordierite crystal-doped tellurite fluorescent glass, characterized in that: The raw materials include rare earth phosphor and precursor glass powder, wherein the precursor glass powder comprises TeO2 60-70%, ZnO 10-20%, Na2O 10-20% and Al2O3 0-10% in terms of molar percentage; The rare earth phosphor includes yttrium aluminum garnet phosphor and cordierite crystal. Calculated by mass percentage, the yttrium aluminum garnet phosphor accounts for 0-12% of the precursor glass powder, and the cordierite crystal accounts for 0-5% of the precursor glass powder; wherein the content of yttrium aluminum garnet phosphor and cordierite crystal is not 0.

2. The cordierite crystal-doped tellurite fluorescent glass according to claim 1, characterized in that: The precursor glass powder comprises, in terms of molar percentage, 65% TeO2, 15% ZnO, 15% Na2O and 5% Al2O3; The rare earth phosphor comprises 12% yttrium aluminum garnet phosphor and 12% cordierite Mg2Al4Si5O 18 Crystal 3%.

3. The cordierite crystal-doped tellurite fluorescent glass according to any one of claims 1 to 2, characterized in that: The cordierite crystal is cordierite Mg2Al4Si5O 18 crystal.

4. A method for preparing the cordierite crystal-doped tellurite fluorescent glass according to any one of claims 1 to 3, characterized in that: The following steps are involved: TeO2, ZnO, Na2O and Al2O3 are ground evenly, melted for the first time, cast into shape, and ground to obtain a precursor glass powder. The precursor glass powder is mixed evenly with yttrium aluminum garnet phosphor and cordierite crystals, and melted for a second time to obtain a mixed glass liquid. The mixed glass liquid is solidified into shape and annealed to obtain the cordierite crystal-doped tellurite fluorescent glass.

5. The method for preparing cordierite crystal-doped tellurite fluorescent glass according to claim 4, wherein: The temperature of the first melting is 900° C. and the time is 40 minutes.

6. The method for preparing cordierite crystal-doped tellurite fluorescent glass according to claim 4, characterized in that: The temperature of the second melting is 600° C. and the time is 20 minutes.

7. The method for preparing cordierite crystal-doped tellurite fluorescent glass according to claim 4, characterized in that: The solidification molding temperature is 400°C.

8. The method for preparing cordierite crystal-doped tellurite fluorescent glass according to claim 4, wherein: The annealing temperature is 300° C. and the holding time is 3 hours.

9. Use of the cordierite crystal-doped tellurite fluorescent glass according to any one of claims 1 to 3 in white light laser lighting.

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