Quantum dot glass raw material, preparation method therefor, and use thereof

Abstract

A quantum dot glass raw material, a preparation method therefor, and a use thereof. The quantum dot glass raw material comprises the following elements in percentage by mole: 12.63-21.05% of the element Si, 1.36-8.2% of the element Al, 1.03-7.19% of the element Zn, 0.03-0.68% of the element Pb, 36.33-76.36% of the element O, 0.34-2.04% of the element G, 10.7-21.41% of the element M, 1.03-5.13% of the element N, and 0.5-3.4% of the element X, wherein the element G is sulfur, selenium, or tellurium, M is an alkali metal element, N is an alkaline earth metal element, and X is a halogen element. The halogen element and the alkali metal element form an alkali metal halide crystal and the alkali metal halide crystal is located on the surface of a PbG quantum dot, so that a defect on the surface of the PBG quantum dot is passivated, and the luminous efficiency is improved.

Description

Quantum dot glass raw materials, preparation methods and applications thereof

[0001] This application claims priority to Chinese patent application No. 202311553941.3, filed on November 17, 2023, entitled “Quantum dot glass raw materials, preparation methods and applications thereof,” the entire contents of which are incorporated herein by reference. Technical Field

[0002] The present disclosure relates to the field of optics, and in particular to quantum dot glass raw materials, preparation methods, and applications thereof. Background Art

[0003] IV-VI semiconductor quantum dots, such as PbS and PbSe, have the advantages of small band gap energy, large exciton Bohr radius, and fluorescence wavelength that can be adjusted below 3μm and 4.4μm, making them widely used in many fields.

[0004] The preparation methods of quantum dots include chemical synthesis, sol-gel method, melting method, etc. Among them, the melting method grows quantum dots in a glass matrix through a heat treatment process, which not only prevents the agglomeration of quantum dots, but also helps to improve the chemical stability, thermal stability and mechanical stability of quantum dots.

[0005] However, due to the large specific surface area of ​​quantum dots, they have more surface defects, such as more dangling bonds, which makes the current PbS, PbSe and other quantum dots have low luminescence efficiency.

[0006] Public content

[0007] In one aspect, a quantum dot glass raw material is provided, wherein the quantum dot glass raw material comprises the following elements in molar percentages: Si element: 12.63% to 21.05%; Al element: 1.36% to 8.2%; Zn element: 1.03% to 7.19%; Pb element: 0.03% to 0.68%; O element: 36.33% to 76.36%; G element: 0.34% to 2.04%; M element: 10.7% to 21.41%; N element: 1.03% to 5.13%; X element: 0.5% to 3.4%;

[0008] Among them, the G element is sulfur element S, selenium element Se or tellurium element Te; the M element is an alkali metal element; the N element is an alkaline earth metal element; and the X element is a halogen element.

[0009] The quantum dot glass raw material provided in the embodiments of the present disclosure can be used to prepare quantum dot glass containing PbG quantum dots, which can be PbS quantum dots, PbSe quantum dots, or PbTe quantum dots. Specifically, when the G element is sulfur (S), the quantum dot glass raw material is used to prepare quantum dot glass containing PbS quantum dots; when the G element is selenium (Se), the quantum dot glass raw material is used to prepare quantum dot glass containing PbSe quantum dots; and when the G element is tellurium (Te), the quantum dot glass raw material is used to prepare quantum dot glass containing PbTe quantum dots.

[0010] The quantum dot glass raw material provided by the embodiments of the present disclosure can be used to prepare quantum dot glass products. Based on the synergistic effect of the above-mentioned elements at specific molar percentages, the prepared quantum dot glass products have at least the following advantages: PbG quantum dots are formed in situ in the glass matrix, which not only facilitates the uniform dispersion of PbG quantum dots, but also helps to improve the thermal stability, chemical stability and mechanical stability of PbG quantum dots. By adding a certain amount of halogen elements and alkali metal elements to cooperate with each other, alkali metal halide crystals can be formed. On the one hand, alkali metal halide crystals also help to reduce the melting temperature and viscosity of the glass melt and improve the uniformity of the glass matrix. On the other hand, alkali metal halide crystals exist on the surface of PbG quantum dots and the two are connected by halogen-lead bonds to passivate the defects on the surface of PbG quantum dots, thereby effectively reducing the capture of carriers by the surface defects of PbG quantum dots and improving the luminous efficiency of PbG quantum dots.

[0011] In some possible implementations, the M element is selected from at least one of Na, K, and Li.

[0012] In some possible implementations, the N element is selected from at least one of Sr, Ca, and Ba.

[0013] In some possible implementations, the X element is selected from at least one of Cl, Br, and I.

[0014] Cl, Br, and I are selected as X elements. They are compounded with the alkali metal element M to form alkali metal halide crystals and bind to the outer surface of the PbG quantum dots, thereby passivating the surface defects of the PbG quantum dots and improving the luminous efficiency.

[0015] In some possible implementations, the Si element exists in the form of silicon oxide;

[0016] The Al element exists in the form of aluminum oxide;

[0017] The G element exists in at least one of the form of ZnG and the form of G elemental substance;

[0018] The Pb element is present in at least one of the form of lead oxide and the form of single lead;

[0019] The alkaline earth metal element N is present in at least one of the form of an alkaline earth metal carbonate compound and an alkaline earth metal halide;

[0020] The alkali metal element M is present in at least one of the form of an alkali metal carbonate compound, an alkali metal sulfide, and an alkali metal halide;

[0021] The halogen element X exists in the form of at least one of an alkaline earth metal halide and an alkali metal halide.

[0022] In some possible implementations, the G element is sulfur element S, and the sulfur element S exists in at least one of the form of ZnS and the form of elemental sulfur.

[0023] In another aspect, a method for preparing quantum dot glass is provided, the method comprising:

[0024] Providing raw materials for preparing quantum dot glass, wherein the elemental composition of the raw materials for preparing quantum dot glass conforms to the elemental composition of any of the above-mentioned raw materials for quantum dot glass;

[0025] Melting the raw materials for preparing the quantum dot glass to obtain a molten glass liquid, placing it in a mold and cooling it to form a glass precursor;

[0026] annealing the glass precursor to obtain a glass intermediate;

[0027] The glass intermediate is heat-treated to precipitate quantum dots in a glass matrix, thereby obtaining the quantum dot glass.

[0028] The method for preparing quantum dot glass provided in the embodiments of the present disclosure sequentially melts, anneals, and heat-treats the raw materials used to prepare the quantum dot glass, thereby precipitating a uniformly dispersed quantum dot system within a glass matrix. The quantum dot system comprises PbG quantum dots and alkali metal halide crystals located on the surface of the PbG quantum dots. This method is simple and convenient to operate, and the resulting quantum dot glass exhibits excellent stability (including mechanical, thermal, and chemical stability) while also improving luminous efficiency compared to related technologies.

[0029] In some possible implementations, the temperature of the melt treatment is 1350° C. to 1500° C., and the time of the melt treatment is 30 minutes to 60 minutes;

[0030] The annealing treatment temperature is 250° C. to 450° C., and the annealing treatment time is 2 hours to 10 hours.

[0031] In some possible implementations, the heat treatment temperature is 450° C. to 600° C., and the heat treatment time is 1 hour to 48 hours.

[0032] Through the above heat treatment process, not only can PbG quantum dots be precipitated in the glass matrix, but also alkali metal halide crystals MX are gradually precipitated based on the PbG quantum dots as crystal nuclei.

[0033] During the heat treatment process, the particle size and distribution density of the PbG quantum dots, as well as the particle size and distribution density of the alkali metal halide crystals MX, can be adjusted by adjusting the heat treatment temperature and heat treatment time.

[0034] In another aspect, a method for preparing a quantum dot optical fiber core is provided, the method comprising:

[0035] Providing raw materials for preparing quantum dot glass, wherein the elemental composition of the raw materials for preparing quantum dot glass conforms to the elemental composition of any of the above-mentioned raw materials for quantum dot glass;

[0036] Melting the raw materials for preparing the quantum dot glass, placing the molten glass liquid in a mold and cooling it to form a glass precursor;

[0037] Performing optical fiber drawing processing on the glass precursor to obtain a first optical fiber core preform;

[0038] annealing the first optical fiber preform to obtain a second optical fiber core preform;

[0039] The second optical fiber core preform is heat-treated to precipitate quantum dots in the glass matrix to obtain the quantum dot optical fiber core.

[0040] In some possible implementations, the temperature of the melt treatment is 1350° C. to 1500° C., and the time of the melt treatment is 30 minutes to 60 minutes;

[0041] The annealing temperature is 250°C to 450°C, and the annealing time is 2 hours to 10 hours;

[0042] The heat treatment temperature is 450° C. to 600° C., and the heat treatment time is 1 hour to 48 hours.

[0043] In another aspect, a quantum dot glass is provided, wherein the quantum dot glass is prepared using the above-mentioned quantum dot glass raw material, or using the above-mentioned method for preparing the quantum dot glass;

[0044] The quantum dot glass includes a glass matrix and a quantum dot system located within the glass matrix. The quantum dot system includes PbG quantum dots and alkali metal halide crystals located on the outer surface of the PbG quantum dots. The alkali metal halide crystals are composed of elements M and X, and the G element is sulfur S, selenium Se, or tellurium Te. Accordingly, the PbG quantum dots are PbS quantum dots, PbSe quantum dots, or PbTe quantum dots.

[0045] The quantum dot glass provided by the embodiments of the present disclosure has at least the following advantages: PbG quantum dots are formed in situ in the glass matrix, which is not only conducive to the uniform dispersion of PbG quantum dots, but also conducive to improving the thermal stability, chemical stability and mechanical stability of PbG quantum dots. By adding a certain amount of halogen elements and alkali metal elements to cooperate with each other, alkali metal halide crystals can be formed. On the one hand, alkali metal halide crystals are also conducive to reducing the melting temperature and viscosity of the glass melt and improving the uniformity of the glass matrix. On the other hand, alkali metal halide crystals exist on the surface of PbG quantum dots and the two are connected by halogen-lead bonds to passivate the defects on the surface of PbG quantum dots, thereby effectively reducing the capture of carriers by surface defects of PbG quantum dots and improving the luminous efficiency of PbG quantum dots.

[0046] In another aspect, a quantum dot optical fiber is provided, comprising a quantum dot optical fiber core, wherein the quantum dot optical fiber core is prepared using the above-mentioned quantum dot glass raw material, or using the above-mentioned method for preparing quantum dot glass;

[0047] The quantum dot optical fiber core includes a glass matrix and a quantum dot system located within the glass matrix. The quantum dot system includes PbG quantum dots and alkali metal halide crystals located on the outer surface of the PbG quantum dots. The alkali metal halide crystals are composed of elements M and X, and the G element is sulfur S, selenium Se, or tellurium Te. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] FIG1 is an absorption spectrum of the glass intermediate and a series of quantum dot glasses provided in Comparative Example 1;

[0049] FIG2 is a graph showing the luminescence spectra of a series of quantum dot glasses provided in Comparative Example 1;

[0050] FIG3 is an absorption spectrum of the glass intermediate and a series of quantum dot glasses provided in Example 1;

[0051] FIG4 is a graph showing the luminescence spectra of a series of quantum dot glasses provided in Example 1;

[0052] FIG5 is an absorption spectrum of the glass intermediate and a series of quantum dot glasses provided in Example 2;

[0053] FIG6 is a graph showing the luminescence spectra of a series of quantum dot glasses provided in Example 2;

[0054] FIG7 is an absorption spectrum diagram of the glass intermediate and a series of quantum dot glasses provided in Example 3;

[0055] FIG8 is a graph showing the luminescence spectra of a series of quantum dot glasses provided in Example 3;

[0056] FIG9 is a graph showing the luminous efficiency of a series of quantum dot glasses provided in Comparative Example 1, Example 1, Example 2, and Example 3 as a function of quantum dot diameter under 600 nm excitation conditions;

[0057] FIG10 is a graph showing the luminous efficiency of a series of quantum dot glasses provided in Comparative Example 1, Example 1, Example 2, and Example 3 as a function of quantum dot diameter under an excitation wavelength of 700 nm;

[0058] FIG11 is an absorption spectrum of the glass intermediate and a series of quantum dot glasses provided in Example 4;

[0059] FIG12 is a graph showing the luminescence spectra of a series of quantum dot glasses provided in Example 4;

[0060] FIG13 is a graph showing the luminous efficiency of a quantum dot glass provided in Example 4 under 900 nm excitation conditions;

[0061] FIG14 is a graph showing the luminous efficiency of a quantum dot glass provided in Example 5 under 600 nm excitation conditions;

[0062] FIG15 is a graph showing the luminous efficiency of a quantum dot glass under 600 nm excitation conditions provided in Example 6;

[0063] FIG16 is a graph showing the luminous efficiency of a quantum dot glass under 600 nm excitation conditions provided in Example 7;

[0064] FIG17 is a graph showing the luminous efficiency of a quantum dot glass provided in Example 8 under 600 nm excitation conditions;

[0065] FIG18 is a structural layout diagram of an exemplary amplifier provided in an embodiment of the present disclosure.

[0066] In the absorption spectra shown in Figures 1, 3, 5, 7, and 11, the horizontal axis Wavelength (nm) refers to the wavelength, and the vertical axis Absorption coefficient (cm -1 ) refers to the absorption coefficient, which represents the absorption of light per unit length in a medium.

[0067] In the luminescence spectrum diagrams shown in FIG2 , FIG4 , FIG6 , FIG8 , and FIG12 , the abscissa Wavelength (nm) refers to the wavelength, and the ordinate PL intensity (au) refers to the photoluminescence intensity.

[0068] In the curves of luminous efficiency versus quantum dot diameter shown in FIG9 and FIG10, the horizontal axis D avg (nm) refers to the average diameter of quantum dot glass, and its vertical axis Quantum yields (%) refers to the luminous efficiency;

[0069] In the luminous efficiency test diagrams shown in FIG13 , FIG14 , FIG15 , FIG16 , and FIG17 , the abscissa Wavelength (nm) refers to the wavelength, and the ordinate Intensity (au) refers to the intensity. DETAILED DESCRIPTION

[0070] Preparation methods for PbS quantum dots include chemical synthesis, sol-gel, and melt processes. Chemically synthesized PbS colloidal quantum dots offer simple surface modification and high operability. However, quantum dots dispersed in solution are prone to aggregation, photooxidation, and poor thermal stability, limiting their application. The melt process uses a heat treatment process to grow quantum dots in a glass matrix. This not only prevents aggregation but also improves the chemical, thermal, and mechanical stability of the quantum dots.

[0071] However, due to the small size and large specific surface area of ​​quantum dots, they have many surface defects, such as many dangling bonds, which leads to low luminescence efficiency. Therefore, it is necessary to passivate the surface defects of quantum dots.

[0072] Compared with chemically synthesized PbS quantum dots, quantum dot glass synthesized by the melt method (also known as quantum dot dispersed glass) is coated with a glass matrix, which makes it impossible to passivate the surface defects of the PbS quantum dots by using surface ligands or other methods after the synthesis of the PbS quantum dots. This leads to serious surface defects of the PbS quantum dots, and light traps generate electrons and vacancies, which seriously reduce the luminescence efficiency of the PbS quantum dots and limit their application.

[0073] To address the technical problems of the related art, the present disclosure provides a quantum dot glass raw material comprising the following elements in molar percentages: Si: 12.63% to 21.05%; Al: 1.36% to 8.2%; Zn: 1.03% to 7.19%; Pb: 0.03% to 0.68%; O: 36.33% to 76.36%; G: 0.34% to 2.04%; M: 10.7% to 21.41%; N: 1.03% to 5.13%; and X: 0.5% to 3.4%. The G element is sulfur (S), selenium (Se), or tellurium (Te); the M element is an alkali metal; the N element is an alkaline earth metal; and the X element is a halogen element.

[0074] The quantum dot glass raw material provided in the embodiments of the present disclosure can be used to prepare quantum dot glass containing PbG quantum dots, which can be PbS quantum dots, PbSe quantum dots, or PbTe quantum dots. Specifically, when the G element is sulfur (S), the quantum dot glass raw material is used to prepare quantum dot glass containing PbS quantum dots; when the G element is selenium (Se), the quantum dot glass raw material is used to prepare quantum dot glass containing PbSe quantum dots; and when the G element is tellurium (Te), the quantum dot glass raw material is used to prepare quantum dot glass containing PbTe quantum dots.

[0075] The quantum dot glass raw materials provided by the embodiments of the present disclosure can be used to prepare quantum dot glass products. Based on the synergistic effect of the above-mentioned elements at specific molar percentages, the prepared quantum dot glass products have at least the following advantages: PbG quantum dots are formed in situ in the glass matrix, which not only facilitates the uniform dispersion of PbG quantum dots, but also helps to improve the thermal stability, chemical stability and mechanical stability of PbG quantum dots. By adding a certain amount of halogen elements and alkali metal elements to cooperate with each other, alkali metal halide crystals can be formed. On the one hand, alkali metal halide crystals also help to reduce the melting temperature and viscosity of the glass melt and improve the uniformity of the glass matrix. On the other hand, alkali metal halide crystals exist on the surface of PbG quantum dots and the two are connected by halogen-lead bonds to achieve passivation of the PbG quantum dot surface, thereby effectively reducing the capture of carriers by surface defects of PbG quantum dots and improving the luminous efficiency of PbG quantum dots.

[0076] Taking G as an example, where the element is sulfur (S), PbS quantum dots are formed in situ in a glass matrix, which not only facilitates the uniform dispersion of the PbS quantum dots but also improves their thermal, chemical, and mechanical stability. By adding a certain amount of halogen elements to the matrix and cooperating with alkali metal elements to form alkali halide crystals, which exist on the surface of the PbG quantum dots and are connected by halogen-lead bonds, the surface of the PbS quantum dots is passivated, effectively reducing carrier capture by surface defects in the PbS quantum dots and improving their luminescence efficiency.

[0077] In some examples, in the quantum dot glass raw material provided by the embodiments of the present disclosure, the sum of the molar percentages of Si, Al, Zn, G, Pb, O, N, M, and X is 100%.

[0078] In combination with the above-mentioned mole percentages of the elements in the quantum dot glass raw materials, some applicable mole percentages of these elements are exemplified below.

[0079] For example, the molar percentage of Si element is, but not limited to, 12.7%, 12.8%, 12.9%, 13%, 13.1%, 13.2%, 13.3%, 13.4%, 13.5%, 13.6%, 13.7%, 13.8%, 13.9%, 14%, 14.2%, 14.4%, 14.5%, 14.6%, 14.8%, 14.9%, 15%, 15.2%, 15.3%, 15.4%, 15.6%, 15.7%, 15.8%, 15.9%, 16.1%, 16.2%, 16.3%, 16.4%, 16.5%, 16.6%, 16.8%, 16.9%, 17. 5.5%, 15.7%, 15.8%, 16%, 16.2%, 16.5%, 16.8%, 17%, 17.3%, 17.5%, 17.7%, 18%, 18.3%, 18.5%, 18.7%, 19%, 19.5%, 20%, 20.1%, 20.2%, 20.3%, 20.4%, 20.5%, 20.6%, 20.7%, 20.8%, 20.9%, 21%, etc.

[0080] Illustratively, the molar percentage of Al element includes, but is not limited to, 1.4%, 1.45%, 1.5%, 1.55%, 2%, 2.3%, 2.5%, 2.8%, 3%, 3.3%, 3.5%, 3.8%, 4%, 4.2%, 4.5%, 4.8%, 5%, 5.3%, 5.5%, 5.7%, 6%, 6.3%, 6.4%, 6.5%, 7%, 7.1%, 7.2%, 7.3%, 7.4%, 7.5%, 7.6%, 7.7%, 7.8%, 7.9%, 8%, 8.1%, 8.2%, etc.

[0081] For example, the molar percentage of Zn element is, but is not limited to, 1.1%, 1.2%, 1.3%, 1.4%, 1.5%, 1.6%, 1.7%, 1.8%, 1.9%, 2%, 2.1%, 2.2%, 2.3%, 2.4%, 2.5%, 2.6%, 2.7%, 2.8%, 2.9%, 3%, 3.1%, 3.2%, 3.3%, 3.4%, 3.5%, 3.6%, 3.7%, 3.8%, 3.9% , 4.0%, 4.1%, 4.2%, 4.3%, 4.4%, 4.5%, 4.6%, 4.7%, 4.8%, 4.9%, 5.0%, 5.1%, 5.2%, 5.3%, 5.4%, 5.5%, 5.6%, 5.7%, 5.8%, 5.9%, 6.0%, 6.1%, 6.2%, 6.3%, 6.4%, 6.5%, 6.6%, 6.7%, 6.8%, 6.9%, 7.0%, 7.1%, etc.

[0082] For example, the molar percentage of the G element includes, but is not limited to, 0.34%, 0.35%, 0.36%, 0.37%, 0.38%, 0.39%, 0.4%, 0.41%, 0.42%, 0.43%, 0.44%, 0.45%, 0.46%, 0.47%, 0.48%, 0.49%, 0.5%, 0.51%, 0. 52%, 0.53%, 0.54%, 0.55%, 0.56%, 0.57%, 0.58%, 0.59%, 0.6%, 0.61%, 0.62%, 0.63%, 0.64%, 0.65%, 0.66%, 0.67%, 0.68%, 0.69%, 0.7%, 0.71%, 0.72%, 0.73%, 0. 74%, 0.75%, 0.76%, 0.77%, 0.78%, 0.79%, 0.8%, 0.81%, 0.82%, 0.83%, 0.84%, 0.85%, 0.86%, 0.87%, 0.88%, 0.89%, 0.9%, 0.91%, 0.92%, 0.93%, 0.94%, 0.95%, 0 0.96%, 0.97%, 0.98%, 0.99%, 1%, 1.1%, 1.15%, 1.2%, 1.25%, 1.3%, 1.35%, 1.4%, 1.45%, 1.5%, 1.55%, 1.6%, 1.65%, 1.7%, 1.75%, 1.8%, 1.85%, 1.9%, 1.95%, 2%, etc. In some examples, the G element is an S element.

[0083] For example, the molar percentage of Pb element is, but is not limited to, 0.03%, 0.04%, 0.05%, 0.06%, 0.07%, 0.08%, 0.09%, 0.1%, 0.11%, 0.12%, 0.13%, 0.14%, 0.15%, 0.16%, 0.17%, 0.18%, 0.19%, 0.2%, 0.21%, 0.22%, 0.23%, 0.24%, 0.25%, 0.26%, 0.27%, 0.28%, 0.29%, 0.3%, 0.31%, 0.32%, 0.33%, 0.34%, 0.35%, 0.36%, 0.37%, 0.38%, 0.39%, 0.40%, 0.41%, 0.42%, 0.43%, 0.44%, 0.45%, 0.46%, 0.47%, 0.48%, 0.49%, 0.50%, 0.51%, 0.52%, 0.53%, 0.54%, 0.55%, 0.56%, 0.57%, 0.58%, 0.59%, 0.60%, 0.61%, 0.62%, 0.63%, 0.64%, 0.65%, 0.66%, 0.67%, 0.68%, 0.69%, 0.70%, 0.71%, 0.72%, 0.73%, 0.74%, 0.75%, 0.76%, 0.77%, 0.78%, 0.79%, 0.80%, 0.81%, 0.82%, 0.83%, 0.84%, 0. .34%, 0.35%, 0.36%, 0.37%, 0.38%, 0.39%, 0.4%, 0.41%, 0.42%, 0.43%, 0.44%, 0.45%, 0.46%, 0.47%, 0.48%, 0.49%, 0.5%, 0.51%, 0.52%, 0.53%, 0.54%, 0.55%, 0.56%, 0.57%, 0.58%, 0.59%, 0.6%, 0.61%, 0.62%, 0.63%, 0.64%, 0.65%, 0.66%, 0.67%, 0.68%, etc.

[0084] Illustratively, the molar percentage of the alkaline earth metal N element includes, but is not limited to, 1.03%, 1.05%, 1.08%, 1.1%, 1.12%, 1.24%, 1.25%, 1.26%, 1.27%, 1.28%, 1.3%, 1.32%, 1.35%, 1.36%, 1.37%, 1.38%, 1.4%, 1.42%, 1.43%, 1.44%, 1.45%, 1.46%, 1.47%, 1.5%, 1.55%, 1.58%, 1.6%, 1.63%, 1.64%, 1.65%, 1.66%, 1.67%, 1.69%, 1.7%. , 1.8%, 1.9%, 2%, 2.1%, 2.2%, 2.3%, 2.4%, 2.5%, 2.6%, 2.7%, 2.8%, 2.9%, 3%, 3.1%, 3.2%, 3.3%, 3.4%, 3.5%, 3.6%, 3.7%, 3.8%, 3.9%, 4.0%, 4.1%, 4.2%, 4.3%, 4.4%, 4.5%, 4.6%, 4.7%, 4.8%, 4.9%, 5.0%, 5.1%, etc.

[0085] Illustratively, the molar percentage of the alkali metal element M is, but is not limited to, 10.7%, 10.8%, 10.9%, 11%, 11.3%, 11.5%, 11.7%, 12%, 12.3%, 12.5%, 12.8%, 13%, 13.3%, 13.5%, 13.8%, 14%, 14.3%, 14.5%, 14.8%, 15%, 15.2%, 15.5%, 15.7%, 16%, 16.2%, 16.5%, 16.7%, 17%, 17.2%, 17.5%, 17.7%, 17.9%, 18%, 18.1%, 18.2%, 18.3%, 18.5%, 18.7%, 18.9%, 19%, 19.3%, 19.5%, 19.7%, 19.9%, 20%, 20.1%, 20.2%, 20.3%, 20.4%, 20.5%, 20.6%, 20.7%, 20.8%, 20.9%, 21%, 21.1%, 21.2%, 21.3%, 21.4%, etc.

[0086] Illustratively, the molar percentage of the halogen element X includes, but is not limited to, 0.5%, 0.6%, 0.7%, 0.8%, 0.9%, 1%, 1.1%, 1.2%, 1.3%, 1.4%, 1.5%, 1.6%, 1.7%, 1.8%, 1.9%, 2%, 2.1%, 2.2%, 2.3%, 2.4%, 2.5%, 2.6%, 2.7%, 2.8%, 2.9%, 3%, 3.1%, 3.2%, 3.3%, 3.4%, etc.

[0087] In the disclosed embodiments, the alkaline earth metal element N is selected from at least one of Sr, Ca, and Ba. That is, the alkaline earth metal element N can be any one, any two, or all three. Sr, Ca, and Ba are selected as the alkaline earth metal element N. These elements exist as glass network intermediates in quantum dot glass products, improving the thermal and chemical stability of the quantum dot glass products.

[0088] The alkali metal element M is at least one selected from the group consisting of Na, K, and Li. That is, the alkali metal element M may be any one of them, any two of them, or all three of them.

[0089] Na, K, and Li are selected as the alkali metal element M, and the molar percentage of the alkali metal element M is greater than the molar percentage of the halogen element X. This allows a portion of the alkali metal element M to combine with the halogen element X to form alkali halide crystals that bind to the outer surface of the PbG quantum dots, thereby passivating surface defects in the PbG quantum dots and improving luminescence efficiency. The remaining alkali metal element M exists as a glass network intermediate in the quantum dot glass product and also acts as a flux.

[0090] The halogen element X is selected from at least one of Cl, Br and I, that is, the halogen element X can be any one of them, any two of them, or all three of them.

[0091] Cl, Br, and I are selected as X elements. They are compounded with the alkali metal element M to form alkali metal halide crystals and bind to the outer surface of the PbG quantum dots, thereby passivating the surface defects of the PbG quantum dots and improving the luminous efficiency.

[0092] In the quantum dot products disclosed herein, alkali halide crystals are dispersed on the outer surface of the PbG quantum dots, and the alkali halide and PbG quantum dots are connected via halide-lead bonds. The term "dispersed" can include a single dispersed arrangement of alkali halide crystals, or multiple alkali halide crystals aggregated or combined into clusters and dispersed in these clusters. Both of these configurations can passivate surface defects in the PbG quantum dots.

[0093] The quantum dot glass raw materials provided in the embodiments of the present disclosure each element exists in at least one of a simple substance form and a compound form, so as to facilitate the acquisition of quantum dot glass raw materials and thus facilitate the preparation of glass products. The existence form of each element is exemplarily described below.

[0094] In the raw materials used to make quantum dot glass, Si exists in the form of silicon oxide, for example, silicon dioxide (SiO2). In the glass product, Si combines with O and acts as a glass former.

[0095] In the raw materials used to make quantum dot glass, Al exists in the form of aluminum oxide, for example, aluminum oxide (Al2O3). In the glass product, Al combines with O and acts as a glass former.

[0096] In the raw materials for preparing quantum dot glass, the Zn element exists in at least one of the forms of ZnO and ZnS. In the glass product, the Zn element is combined with the O element and serves as a glass intermediate.

[0097] In the raw materials for preparing quantum dot glass, the G element exists in at least one of the form of ZnG and the form of G elemental substance. For example, the ZnG form can be ZnS, ZnSe, etc. In the glass product, the G element exists in the form of PbG quantum dots.

[0098] For example, if element G is sulfur S, the sulfur S exists in at least one of the form of ZnS and the form of elemental sulfur. In one example, the sulfur S is introduced into the raw materials for preparing the quantum dot glass in the form of ZnS.

[0099] Since sulfur element S is easily volatile, the molar percentage of sulfur element S can be made greater than the molar percentage of Pb element. For example, the ratio of the molar percentage of sulfur element S to the molar percentage of Pb element is 2 to 30:1, including but not limited to 2 to 25:1, 2 to 20:1, 2 to 15:1, etc.

[0100] In the raw materials used to make quantum dot glass, the Pb element exists in at least one of the form of lead oxide and the form of elemental lead. For example, the lead oxide can be lead oxide (PbO). In the glass product, the Pb element exists in the form of PbG quantum dots.

[0101] The alkaline earth metal element N exists in the form of at least one of an alkaline earth metal carbonate and an alkaline earth metal halide. For example, the alkaline earth metal carbonate may be at least one of strontium carbonate (SrCO3), calcium carbonate (CaCO3), and barium carbonate (BaCO3). For example, the alkaline earth metal halide may be at least one of strontium chloride (SrCl2), strontium bromide (SrBr2), strontium iodide (SrI2), calcium chloride (CaCl2), calcium bromide (CaBr2), calcium iodide (CaI2), barium chloride (BaCl2), barium bromide (BaBr2), and barium iodide (BaI2). During the melting process, the carbon element evaporates as a gas. Furthermore, in the glass product, the alkaline earth metal element N combines with the oxygen element and serves as a glass intermediate.

[0102] In the raw materials for preparing quantum dot glass, the alkali metal element M exists in the form of at least one of an alkali metal carbonate, an alkali metal sulfide, and an alkali metal halide. For example, an alkali metal carbonate can be at least one of sodium carbonate (Na2CO3), potassium carbonate (K2CO3), and lithium carbonate (Li2CO3). For example, an alkali metal sulfide can be at least one of sodium sulfide (Na2S), potassium sulfide (K2S), and lithium sulfide (Li2S). During the melting process, the C element evaporates in the form of gas. In addition, in the glass product, part of the alkali metal element M is compounded with the halogen element X to form MX crystals and passivate the surface of the PbG quantum dots, while the remaining alkali metal element serves as a glass network intermediate.

[0103] In the raw materials for preparing quantum dot glass, the halogen element X is present in the form of at least one of an alkaline earth metal halide and an alkali metal halide. For example, the alkaline earth metal halide may be at least one of strontium chloride (SrCl2), strontium bromide (SrBr2), strontium iodide (SrI2), calcium chloride (CaCl2), calcium bromide (CaBr2), calcium iodide (CaI2), barium chloride (BaCl2), barium bromide (BaBr2), and barium iodide (BaI2). For example, the alkali metal halide may be at least one of sodium chloride (NaCl), sodium bromide (NaBr), sodium iodide (NaI), potassium chloride (KCl), potassium bromide (KBr), potassium iodide (KI), lithium chloride (LiCl), lithium bromide (LiBr), and lithium iodide (LiI).

[0104] For example, when alkali metal halides are introduced into the raw materials for preparing quantum dot glass in place of alkali metal oxides, the alkali metal elements are replaced in equal molar amounts, such as using 2 mol % NaCl to replace 1 mol % Na2O.

[0105] In some examples, the molar percentage of the halogen element X in the quantum dot glass raw material is 0.5% to 3.4%, further 0.68% to 2.05%, which can not only achieve the above-mentioned passivation effect, but also prevent problems such as phase separation during the glass formation process.

[0106] On the other hand, the present disclosure also provides a method for preparing quantum dot glass, which comprises the following steps:

[0107] Step S11: providing raw materials for preparing quantum dot glass, wherein the element composition of the raw materials for preparing quantum dot glass conforms to the element composition of any of the above-mentioned raw materials for quantum dot glass.

[0108] Step S12: melting the raw materials for preparing the quantum dot glass, placing the molten glass liquid in a mold and cooling it to form a glass precursor.

[0109] Step S13: annealing the glass precursor to obtain a glass intermediate.

[0110] Step S14: heat-treating the glass intermediate to precipitate quantum dots in the glass matrix to obtain quantum dot glass.

[0111] The method for preparing quantum dot glass provided in the embodiments of the present disclosure sequentially melts, anneals, and heat-treats the raw materials used to prepare the quantum dot glass. This method precipitates uniformly dispersed PbG quantum dots and alkali metal halide crystals located on the surface of the PbG quantum dots within a glass matrix, thereby producing the quantum dot glass. This method is simple and convenient to operate, and the resulting quantum dot glass exhibits excellent stability (including mechanical, thermal, and chemical stability) while also improving luminous efficiency compared to related technologies.

[0112] In step S11 , raw materials for preparing quantum dot glass are provided, and the element composition of the raw materials for preparing quantum dot glass conforms to the element composition of any of the above-mentioned raw materials for quantum dot glass.

[0113] As described above, the Si element exists in the form of silicon oxide; the Al element exists in the form of aluminum oxide; the G element exists in at least one of the ZnG form and the G element form; the Pb element exists in at least one of the lead oxide form and the lead element form; the alkaline earth metal element N exists in at least one of the alkaline earth metal carbonate form and the alkaline earth metal halide form; the alkali metal element M exists in at least one of the alkali metal carbonate form, the alkali metal sulfide form and the alkali metal halide form; and the halogen element X exists in at least one of the alkaline earth metal halide form and the alkali metal halide form.

[0114] For each element, the existence form of each element is determined and used as a component in the raw material for preparing quantum dot glass. According to the molar ratio of the elements in the above-mentioned quantum dot glass raw materials, the ratio of each component in the raw material for preparing quantum dot glass is determined, thereby obtaining the raw material for preparing quantum dot glass.

[0115] In some examples, each component of the raw material for preparing the quantum dot glass is accurately weighed according to the ratio, put into a mortar and ground thoroughly to mix evenly, and then step S12 is performed.

[0116] In step S12, the raw materials for preparing the quantum dot glass are melted, and the molten glass is placed in a mold and cooled to form. For example, the raw materials for preparing the quantum dot glass can be placed in a sealed crucible and melted to obtain molten glass. However, PbG quantum dots are not formed in the molten glass.

[0117] Some applicable melt treatment temperatures are 1350°C to 1500°C, including but not limited to 1350°C, 1360°C, 1370°C, 1380°C, 1390°C, 1400°C, 1410°C, 1420°C, 1430°C, 1440°C, 1450°C, 1460°C, 1470°C, 1480°C, 1490°C, 1500°C, etc., and some applicable melt treatment times are 30 minutes to 60 minutes, including but not limited to 30 minutes, 40 minutes, 50 minutes, 60 minutes, etc.

[0118] In step S13, the glass precursor is annealed to obtain a glass intermediate, thereby eliminating residual stress. The obtained glass intermediate is yellow and transparent.

[0119] Some applicable annealing temperatures are 250°C to 450°C, including but not limited to 250°C, 270°C, 280°C, 290°C, 300°C, 310°C, 320°C, 330°C, 340°C, 350°C, 360°C, 370°C, 380°C, 390°C, 400°C, 410°C, 420°C, 430°C, 440°C, 450°C, etc., and the annealing time is 2 hours to 10 hours, including but not limited to 3 hours, 4 hours, 5 hours, 6 hours, 7 hours, 8 hours, 9 hours, 10 hours, etc.

[0120] In step S14, the glass intermediate is heat-treated to precipitate quantum dots in the glass matrix to obtain quantum dot glass.

[0121] Illustratively, the temperature of the heat treatment is 450°C to 600°C, including but not limited to 450°C, 460°C, 470°C, 480°C, 490°C, 500°C, 510°C, 520°C, 530°C, 540°C, 550°C, 560°C, 570°C, 580°C, 590°C, 600°C, etc.

[0122] The heat treatment time is 1 hour to 48 hours, which includes but is not limited to: 1 hour, 2 hours, 3 hours, 4 hours, 5 hours, 6 hours, 7 hours, 8 hours, 9 hours, 10 hours, 11 hours, 12 hours, 13 hours, 14 hours, 15 hours, 16 hours, 17 hours, 18 hours, 19 hours, 20 hours, 21 hours, 22 hours, 23 hours, 24 hours, 25 hours, 26 hours, 27 hours, 28 hours, 29 hours, 30 hours, 31 hours, 32 hours, 33 hours, 34 hours, 35 hours, 36 hours, 37 hours, 38 hours, 39 hours, 40 hours, 41 hours, 42 hours, 43 hours, 44 hours, 45 hours, 46 hours, 47 hours, 48 ​​hours, etc.

[0123] Through the above-mentioned heat treatment process, not only can PbG quantum dots be precipitated in the glass matrix, but also, based on the PbG quantum dots as crystal nuclei, alkali metal halide crystals MX are gradually precipitated to form a quantum dot system.

[0124] During the heat treatment process, the particle size and distribution density of the PbG quantum dots, as well as the particle size and distribution density of the alkali metal halide crystals MX, can be adjusted by adjusting the heat treatment temperature and heat treatment time.

[0125] The heat treatment process, also known as the glass crystallization process, includes two stages: nucleation and crystal growth. The higher the heat treatment temperature, the faster the nucleus growth rate, and the longer the heat treatment time, the larger the crystal size. Therefore, by controlling the heat treatment time and temperature, PbG quantum dots with high density and desired size can be obtained.

[0126] In another aspect, the present disclosure further provides a method for preparing a quantum dot optical fiber core, the method comprising the following steps:

[0127] Step S21 : providing raw materials for preparing quantum dot glass, wherein the element composition of the raw materials for preparing quantum dot glass conforms to the element composition of any of the above-mentioned raw materials for quantum dot glass.

[0128] Step S22: Melt the raw materials for preparing quantum dot glass, place the molten glass liquid in a mold, cool and shape it, and obtain a glass precursor.

[0129] Step S23: performing optical fiber drawing processing on the glass precursor to obtain a first optical fiber core preform.

[0130] Step S24: annealing the first optical fiber preform to obtain a second optical fiber core preform.

[0131] Step S25: heat-treating the second optical fiber core preform to precipitate quantum dots in the glass matrix to obtain a quantum dot optical fiber core.

[0132] The method for preparing a quantum dot optical fiber core provided in the embodiments of the present disclosure sequentially subjects the raw materials for preparing quantum dot glass to a melting process, an optical fiber drawing process, an annealing process, and a heat treatment, thereby precipitating a uniformly dispersed quantum dot system in a glass matrix to obtain a quantum dot optical fiber core. The quantum dot system includes PbG quantum dots and alkali metal halide crystals located on the surface of the PbG quantum dots. The method is simple and convenient to operate, and the resulting quantum dot glass has improved luminous efficiency compared to related technologies while having good stability (including mechanical stability, thermal stability, and chemical stability).

[0133] Illustratively, the temperature of the melt treatment is 1350°C to 1500°C, and the time of the melt treatment is 30 minutes to 60 minutes; the temperature of the annealing treatment is 250°C to 450°C, and the time of the annealing treatment is 2 hours to 10 hours; the temperature of the heat treatment is 450°C to 600°C, and the time of the heat treatment is 1 hour to 48 hours.

[0134] Among them, for step S21, step S22, step S24, and step S25, please refer to the relevant descriptions of step S11, step S12, step S13, and step S14 respectively, and will not be repeated here.

[0135] In step S23, the glass precursor is subjected to an optical fiber drawing process to obtain a first optical fiber core preform. The drawing process can be performed using existing optical fiber preform drawing technology.

[0136] On the other hand, the embodiments of the present disclosure further provide a quantum dot glass, which is prepared using any of the above-mentioned quantum dot glass raw materials, or using any of the above-mentioned quantum dot glass preparation methods.

[0137] Among them, the quantum dot glass includes a glass matrix and a quantum dot system located in the glass matrix. The quantum dot system includes PbG quantum dots and alkali metal halide crystals located on the outer surface of the PbG quantum dots. The alkali metal halide crystals are composed of elements M and X. The G element is sulfur element S, selenium element Se or tellurium element Te. Correspondingly, the PbG quantum dots are PbS quantum dots, PbSe quantum dots or PbTe quantum dots.

[0138] The quantum dot glass provided by the embodiments of the present disclosure has at least the following advantages: PbG quantum dots are formed in situ in the glass matrix, which is not only conducive to the uniform dispersion of PbG quantum dots, but also conducive to improving the thermal stability, chemical stability and mechanical stability of PbG quantum dots. By adding a certain amount of halogen elements and alkali metal elements to cooperate with each other, alkali metal halide crystals can be formed. On the one hand, alkali metal halide crystals are also conducive to reducing the melting temperature and viscosity of the glass melt and improving the uniformity of the glass matrix. On the other hand, alkali metal halide crystals exist on the surface of PbG quantum dots and the two are connected by halogen-lead bonds to passivate the defects on the surface of PbG quantum dots, thereby effectively reducing the capture of carriers by surface defects of PbG quantum dots and improving the luminous efficiency of PbG quantum dots.

[0139] Alkali halide crystals are dispersed on the outer surface of the PbG quantum dots, connected by halide-lead bonds. The term "dispersed" can include either a single, dispersed arrangement of alkali halide crystals or a clustered or combined arrangement of multiple alkali halide crystals. Both configurations can passivate surface defects in the PbG quantum dots.

[0140] The quantum dot glass provided in the embodiment of the present disclosure can adjust the particle size of the PbG quantum dots by adjusting the heat treatment process, thereby achieving the regulation of the absorption and luminescence of the quantum dot glass within the 1000nm-2400nm band.

[0141] In some examples, the quantum dot glass provided by the embodiments of the present disclosure includes: PbS quantum dots and alkali metal halide crystals located on the outer surface of the PbS quantum dots.

[0142] In yet another aspect, embodiments of the present disclosure further provide a quantum dot optical fiber comprising a quantum dot optical fiber core, the quantum dot optical fiber core being prepared using any of the aforementioned quantum dot glass raw materials, or using any of the aforementioned methods for preparing a quantum dot optical fiber core. The quantum dot optical fiber core comprises a glass matrix and a quantum dot system within the glass matrix, the quantum dot system comprising PbG quantum dots and alkali metal halide crystals located on the outer surface of the PbG quantum dots, the alkali metal halide crystals being composed of elements M and X, and element G being sulfur (S), selenium (Se), or tellurium (Te). Accordingly, the PbG quantum dots are PbS quantum dots, PbSe quantum dots, or PbTe quantum dots.

[0143] The quantum dot optical fiber provided by the embodiments of the present disclosure has at least the following advantages: the PbG quantum dots are formed in situ in the glass matrix, which not only facilitates the uniform dispersion of the PbG quantum dots but also improves the thermal, chemical, and mechanical stability of the PbG quantum dots. By adding a certain amount of halogen elements to the matrix, which interact with alkali metal elements, alkali halide crystals can be formed. On the one hand, the alkali halide crystals also help reduce the melting temperature and viscosity of the glass melt and improve the uniformity of the glass matrix. On the other hand, the alkali halide crystals are present on the surface of the PbG quantum dots and the two are connected by halogen-lead bonds to passivate defects on the PbG quantum dot surface, thereby effectively reducing the capture of carriers by the PbG quantum dot surface defects and improving the luminescence efficiency of the PbG quantum dots.

[0144] Alkali halide crystals are dispersed on the outer surface of the PbG quantum dots, and the two are connected by halogen-lead bonds. For more information on alkali halide crystals in the core of quantum dot optical fibers, please refer to the above discussion on quantum dot glass.

[0145] The quantum dot optical fiber provided in the embodiment of the present disclosure can adjust the particle size of the PbG quantum dots by adjusting the heat treatment process, thereby achieving the regulation of the absorption and luminescence of the quantum dot optical fiber core within the 1000nm-2400nm band.

[0146] In some examples, the quantum dot optical fiber provided by the embodiments of the present disclosure includes PbS quantum dots and alkali metal halide crystals located on the outer surface of the PbS quantum dots.

[0147] Of course, the quantum dot glass products involved in the embodiments of the present disclosure can be not only the aforementioned quantum dot glass and quantum dot optical fiber, but also rod-shaped glass. The quantum dot glass or quantum dot optical fiber provided by the embodiments of the present disclosure can achieve adjustment of the absorption spectrum and luminescence spectrum from the near-infrared to the mid-infrared band, giving them great application potential in the fields of infrared detection and near-infrared fluorescence.

[0148] Fiber amplifiers are crucial components in fiber-optic communication lines. In backbone long-distance optical communication networks, signal power attenuates as transmission distance increases. Therefore, amplifiers are needed to amplify the signal at intervals. A typical amplifier is an erbium-doped fiber amplifier (EDFA). Its operating principle is to couple signal and pump light into an erbium-doped fiber through a wavelength division multiplexer (WDM). An isolator is also included to ensure forward transmission of the optical signal.

[0149] The current noise figure of erbium-doped fiber amplifiers is relatively high. One implementation scheme is to replace the existing erbium-doped fiber with the quantum dot glass or quantum dot fiber provided by the embodiments of the present disclosure to obtain a new amplifier, thereby achieving a lower noise figure.

[0150] Among them, the central wavelength of the new amplifier based on the quantum dot glass product of the embodiment of the present disclosure can be controlled by the central particle size of the quantum dots, and the operating bandwidth can be controlled by the size distribution of the quantum dots. The central particle size and size distribution of the quantum dots can be controlled by different heat treatment conditions, thereby providing a new way to expand the optical fiber communication band and industrial applications.

[0151] For example, referring to Figure 18 , an amplifier structure includes: a signal source 1, an isolator 2, a wavelength division multiplexer 3, a pump source 4, and a quantum dot glass product 5 (including quantum dot glass or quantum dot glass fiber). Signal light is output from signal source 1 and enters isolator 2 to ensure forward transmission of the optical signal. It then enters wavelength division multiplexer 3, where it enters quantum dot glass product 5 for optical amplification and output. Simultaneously, pump light is output from pump source 4 and passes through wavelength division multiplexer 3 before entering quantum dot glass product 5 and quantum dot glass fiber 6. After coupling the signal and pump light in the wavelength division multiplexer, they enter quantum dot glass product 5 for signal amplification and output.

[0152] The exemplary embodiments of the present disclosure will be described in more detail below. Although the exemplary embodiments of the present disclosure are described below, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments set forth herein. Where specific techniques or conditions are not specified in the examples, the techniques or conditions described in the literature in this field or in accordance with the product specifications are used. Where the manufacturer of the reagents or instruments used is not specified, they are all conventional products that can be obtained commercially.

[0153] The following Examples 1 to 8 and Comparative Example 1 all provide a quantum dot glass raw material. The formulas of these quantum dot glass raw materials are shown in Table 1.

[0154] Among them, in the preparation raw materials of the quantum dot glass of Examples 1 to 8, and Comparative Example 1, the Si element exists in the form of silicon dioxide (SiO2), the Al element exists in the form of aluminum oxide (Al2O3), the Zn element exists in the form of ZnO and ZnS, the S element exists in the form of ZnS, the Pb element exists in the form of lead oxide (PbO), the Ca element exists in the form of calcium carbonate (CaCO3), the Na element exists in the form of sodium carbonate (Na2CO3) and sodium chloride (NaCl), and the Cl element exists in the form of sodium chloride (NaCl).

[0155] Table 1

[0156] Comparative Example 1

[0157] Comparative Example 1 prepared quantum dot glass, which was prepared by the following method: providing uniformly mixed raw materials for preparing quantum dot glass, wherein the elemental composition of the raw materials for preparing quantum dot glass conforms to the elemental composition of the raw materials for preparing quantum dot glass in Comparative Example 1 in Table 1. The raw materials for preparing quantum dot glass were placed in a crucible and melted at a melting temperature of 1400°C for 40 minutes to obtain a molten glass liquid. After the molten glass liquid was cooled, a glass precursor was formed, which was transferred to an annealing furnace for annealing at a temperature of 400°C for 5 hours to obtain a yellow transparent glass intermediate. Testing showed that the yellow transparent glass intermediate had no absorption peak in the near-infrared band of visible light.

[0158] The glass intermediate was transferred to a heat treatment furnace for heat treatment, thereby precipitating PbS quantum dots in the glass matrix to obtain a series of quantum dot glasses. The heat treatment conditions for Comparative Example 1 and some test parameters of the quantum dot glasses are shown in Table 2.

[0159] Table 2

[0160] In Table 2, λ abs Refers to the central wavelength of the absorption peak of the current quantum dot glass, in nm; D avg Refers to the average diameter of PbS quantum dots in current quantum dot glass, in nm; λ PL Refers to the central wavelength of the current quantum dot glass's luminescence peak, measured in nm.

[0161] Absorption spectroscopy was conducted on a series of quantum dot glasses prepared in Comparative Example 1. The test results are shown in Table 2 and Figure 1. The numbers 0-12 in Figure 1 represent sample numbers 0 to 12 in Table 2. As shown in Figure 1, the absorption peak of the quantum dot glass gradually shifts toward the longer wavelength range with increasing heat treatment temperature or increasing heat treatment time. This indicates that PbS quantum dots are precipitated in the glass samples prepared in Comparative Example 1, and the size of the PbS quantum dots gradually increases with increasing heat treatment temperature or increasing heat treatment time.

[0162] Luminescence spectra were tested for a series of quantum dot glasses provided in Comparative Example 1, using an excitation wavelength of 800 nm. The test results are shown in Table 2 and Figure 2 . The numbers 1 to 12 in Figure 2 represent sample numbers 1 to 12 in Table 2. As shown in Figure 2 , the fluorescence peak of the quantum dot glass gradually shifts toward the longer wavelength range with increasing heat treatment temperature or time. This indicates that PbS quantum dots are precipitated in the glass samples prepared in Comparative Example 1, and the size of the PbS quantum dots gradually increases with increasing heat treatment temperature or time.

[0163] Example 1

[0164] Quantum dot glass was prepared in Example 1 by the following method: providing uniformly mixed raw materials for preparing quantum dot glass, wherein the elemental composition of the raw materials for preparing quantum dot glass conforms to the elemental composition of the raw materials for preparing quantum dot glass in Example 1 in Table 1. The raw materials for preparing quantum dot glass were placed in a crucible for melting at a melting temperature of 1400°C for a melting time of 40 minutes to obtain a molten glass liquid. After the molten glass liquid was cooled to form a glass precursor, the precursor was transferred to an annealing furnace for annealing at a temperature of 400°C for 5 hours to obtain a yellow transparent glass intermediate. Testing showed that the yellow transparent glass intermediate had no absorption peak in the near-infrared band of visible light.

[0165] The glass intermediate was transferred to a heat treatment furnace for heat treatment, thereby precipitating PbS quantum dots within the glass matrix. NaCl crystals were distributed on the outer surface of the PbS quantum dots, forming a quantum dot system, thereby producing a series of quantum dot glasses. Absorption and luminescence spectra were measured for the glass intermediate provided in Example 1 and a series of quantum dot glasses. The excitation wavelength for the luminescence spectrum test was 800 nm.

[0166] The heat treatment conditions of Example 1 and some test parameters of the quantum dot glass are shown in Table 3.

[0167] Table 3

[0168] In Table 3, λ abs Refers to the central wavelength of the absorption peak of the current quantum dot glass, in nm; λ PL Refers to the central wavelength of the current quantum dot glass's luminescence peak, in nm; D avg Refers to the average diameter of PbS quantum dots in current quantum dot glass, in nm.

[0169] Absorption spectroscopy was performed on the glass intermediate provided in Example 1 and a series of quantum dot glasses. The test results are shown in Table 3 and Figure 3. Numbers 0-13 in Figure 3 represent sample numbers 0 to 13 in Table 3. As shown in Figure 3, the glass intermediate exhibits no absorption peak. However, the absorption peak of the quantum dot glass gradually shifts toward longer wavelengths with increasing heat treatment temperature or time. This indicates that PbS quantum dots are precipitated in the glass samples prepared in Example 1, and that the size of the PbS quantum dots increases with increasing heat treatment temperature or time.

[0170] Luminescence spectra of a series of quantum dot glasses provided in Example 1 were tested at an excitation wavelength of 800 nm. The test results are shown in Table 3 and Figure 4 . Numbers 1-13 in Figure 4 represent sample numbers 1 to 13 in Table 3. As shown in Figure 4 , the fluorescence peak of the quantum dot glasses gradually shifts toward longer wavelengths with increasing heat treatment temperature or time. This indicates that PbS quantum dots are precipitated in the glass samples prepared in Example 1, and that the size of the PbS quantum dots increases with increasing heat treatment temperature or time.

[0171] Luminous efficiency tests were conducted on a series of quantum dot glasses provided in Example 1 and Comparative Example 1, respectively. The test results at an excitation wavelength of 600 nm are shown in Figure 9 , and the test results at an excitation wavelength of 700 nm are shown in Figure 10 . As shown in Figures 9 and 10 , the luminous efficiency of the quantum dot glass in Comparative Example 1 was less than 30% under excitation by both 600 nm and 700 nm wavelength light sources. Compared to Comparative Example 1, the luminous efficiency of the quantum dot glass provided in Example 1 was significantly improved, given the same average diameter of the PbS quantum dots. This is because Cl ions effectively passivate the dangling Pb ion bonds on the surface of the PbS quantum dots, thereby effectively improving the luminous efficiency of the PbS quantum dots.

[0172] Example 2

[0173] Quantum dot glass was prepared in Example 2 by the following method: providing uniformly mixed raw materials for preparing quantum dot glass, wherein the elemental composition of the raw materials for preparing quantum dot glass conforms to the elemental composition of the raw materials for preparing quantum dot glass in Example 2 in Table 1. The raw materials for preparing quantum dot glass were placed in a crucible for melting at a melting temperature of 1400°C for a melting time of 40 minutes to obtain a molten glass liquid. After the molten glass liquid was cooled to form a glass precursor, the precursor was transferred to an annealing furnace for annealing at a temperature of 400°C for 5 hours to obtain a yellow transparent glass intermediate. Testing showed that the yellow transparent glass intermediate had no absorption peak in the near-infrared band of visible light.

[0174] The glass intermediate was transferred to a heat treatment furnace for heat treatment, thereby precipitating PbS quantum dots within the glass matrix. NaCl crystals were distributed on the outer surfaces of the PbS quantum dots, thereby producing a series of quantum dot glasses. Absorption and luminescence spectra were measured for the glass intermediate provided in Example 2 and a series of quantum dot glasses, with the excitation wavelength for the luminescence spectrum being 800 nm.

[0175] The heat treatment conditions of Example 2 and some test parameters of the quantum dot glass are shown in Table 4.

[0176] Table 4

[0177] In Table 4, λ abs Refers to the central wavelength of the absorption peak of the current quantum dot glass, in nm; λ PL Refers to the central wavelength of the current quantum dot glass's luminescence peak, in nm; D avg Refers to the average diameter of PbS quantum dots in current quantum dot glass, in nm.

[0178] Absorption spectroscopy was performed on the glass intermediate provided in Example 2 and a series of quantum dot glasses. The test results are shown in Table 4 and Figure 5. The numbers 0-13 in Figure 5 represent sample numbers 0 to 13 in Table 4. As shown in Figure 5, the glass intermediate exhibits no absorption peak. However, the absorption peak of the quantum dot glass gradually shifts to a longer wavelength with increasing heat treatment temperature or time. This indicates that PbS quantum dots are precipitated in the glass samples prepared in Example 2, and the size of the PbS quantum dots increases with increasing heat treatment temperature or time.

[0179] Luminescence spectra of a series of quantum dot glasses provided in Example 2 were tested at an excitation wavelength of 800 nm. The test results are shown in Table 4 and Figure 6 . Numbers 1-13 in Figure 6 represent sample numbers 1 to 13 in Table 4. As shown in Figure 6 , the fluorescence peak of the quantum dot glasses gradually shifts toward longer wavelengths with increasing heat treatment temperature or time. This indicates that PbS quantum dots are precipitated in the glass samples prepared in Example 2, and the size of the PbS quantum dots increases with increasing heat treatment temperature or time.

[0180] Luminous efficiency tests were conducted on a series of quantum dot glasses provided in Example 2 and Comparative Example 1, respectively. The test results at an excitation wavelength of 600 nm are shown in Figure 9 , and the test results at an excitation wavelength of 700 nm are shown in Figure 10 . As shown in Figures 9 and 10 , the luminous efficiency of the quantum dot glass in Comparative Example 1 was less than 30% under both 600 nm and 700 nm wavelength light sources. Compared to Comparative Example 1, the luminous efficiency of the quantum dot glass provided in Example 2 was significantly improved, given the same average diameter of the PbS quantum dots. This is because the Cl ions effectively passivate the dangling Pb ion bonds on the surface of the PbS quantum dots, thereby effectively improving the luminous efficiency of the PbS quantum dots.

[0181] Example 3

[0182] Quantum dot glass was prepared in Example 3 by the following method: providing uniformly mixed raw materials for preparing quantum dot glass, wherein the elemental composition of the raw materials for preparing quantum dot glass conforms to the elemental composition of the raw materials for preparing quantum dot glass in Example 3 in Table 1. The raw materials for preparing quantum dot glass were placed in a crucible for melting at a melting temperature of 1400°C for a melting time of 40 minutes to obtain a molten glass liquid. After the molten glass liquid was cooled to form a glass precursor, the precursor was transferred to an annealing furnace for annealing at a temperature of 400°C for 5 hours to obtain a yellow transparent glass intermediate. Testing showed that the yellow transparent glass intermediate had no absorption peak in the near-infrared band of visible light.

[0183] The glass intermediate was transferred to a heat treatment furnace for heat treatment, thereby precipitating PbS quantum dots within the glass matrix. NaCl crystals were distributed on the outer surfaces of the PbS quantum dots, thereby producing a series of quantum dot glasses. Absorption and luminescence spectra were measured for the glass intermediate provided in Example 3 and a series of quantum dot glasses. The excitation wavelength for the luminescence spectrum test was 800 nm.

[0184] The heat treatment conditions of Example 3 and some test parameters of the quantum dot glass are shown in Table 5.

[0185] Table 5

[0186] In Table 5, λ abs Refers to the central wavelength of the absorption peak of the current quantum dot glass, in nm; λ PL Refers to the central wavelength of the current quantum dot glass's luminescence peak, in nm; D avg Refers to the average diameter of PbS quantum dots in current quantum dot glass, in nm.

[0187] Absorption spectroscopy was performed on the glass intermediate provided in Example 3 and a series of quantum dot glasses. The test results are shown in Table 5 and Figure 7. Numbers 0-13 in Figure 7 represent sample numbers 0 to 13 in Table 5. As shown in Figure 7, the glass intermediate exhibits no absorption peak. However, the absorption peak of the quantum dot glass gradually shifts toward longer wavelengths with increasing heat treatment temperature or time. This indicates that PbS quantum dots are precipitated in the glass samples prepared in Example 3, and that the size of the PbS quantum dots increases with increasing heat treatment temperature or time.

[0188] Luminescence spectra of a series of quantum dot glasses provided in Example 3 were tested at an excitation wavelength of 800 nm. The test results are shown in Table 5 and Figure 8 . Numbers 1-13 in Figure 8 represent sample numbers 1 to 13 in Table 5. As shown in Figure 8 , the fluorescence peak of the quantum dot glasses gradually shifts toward longer wavelengths with increasing heat treatment temperature or time. This indicates that PbS quantum dots are precipitated in the glass samples prepared in Example 3, and that the size of the PbS quantum dots increases with increasing heat treatment temperature or time.

[0189] Luminous efficiency tests were conducted on a series of quantum dot glasses provided in Example 3 and Comparative Example 1, respectively. The test results at an excitation wavelength of 600 nm are shown in Figure 9 , and the test results at an excitation wavelength of 700 nm are shown in Figure 10 . As shown in Figures 9 and 10 , the luminous efficiency of the quantum dot glass in Comparative Example 1 was less than 30% under excitation by both 600 nm and 700 nm wavelength light sources. Compared to Comparative Example 1, with the same average diameter of the PbS quantum dots, the luminous efficiency of the quantum dot glass provided in Example 3 was significantly improved, reaching 49.3%. This is because the Cl ions effectively passivate the dangling Pb ion bonds on the surface of the PbS quantum dots, thereby effectively improving the luminous efficiency of the PbS quantum dots.

[0190] Example 4

[0191] Quantum dot glass was prepared in Example 4, which was prepared by the following method: providing uniformly mixed raw materials for preparing quantum dot glass, wherein the elemental composition of the raw materials for preparing quantum dot glass conforms to the elemental composition of the raw materials for preparing quantum dot glass in Example 4 in Table 1. The raw materials for preparing quantum dot glass were placed in a crucible for melting treatment, the melting temperature was 1400°C, and the melting time was 40 minutes to obtain molten glass liquid. After the molten glass liquid was cooled, a glass precursor was formed, which was transferred to an annealing furnace for annealing treatment, the annealing temperature was 400°C, and the annealing time was 5 hours to obtain a yellow transparent glass intermediate (numbered AP). After testing, the yellow transparent glass intermediate had no absorption peak in the near-infrared band of visible light.

[0192] The glass intermediate was transferred to a heat treatment furnace for heat treatment, thereby precipitating PbS quantum dots within the glass matrix. NaCl crystals were distributed on the outer surface of the PbS quantum dots, resulting in a series of quantum dot glasses. These quantum dot glasses were heat treated at temperatures of 520°C, 530°C, and 540°C for 5 or 10 hours, respectively. These quantum dot glasses were designated as 52010, 53005, 53010, and 54010, respectively.

[0193] Absorption spectroscopy was performed on the glass intermediate provided in Example 4 and a series of quantum dot glasses. The test results are shown in Figure 11. As shown in Figure 11, the glass intermediate has no absorption peak. However, the absorption peak of the quantum dot glass gradually shifts to a longer wavelength with increasing heat treatment temperature or time. This indicates that PbS quantum dots are precipitated in the glass samples prepared in Example 4, and the size of the PbS quantum dots gradually increases with increasing heat treatment temperature or time.

[0194] Luminescence spectra were tested on a series of quantum dot glasses provided in Example 4. The test results are shown in Figure 12. As shown in Figure 12, the fluorescence peak of the quantum dot glass gradually shifts toward the longer wavelength band as the heat treatment temperature increases or the heat treatment time prolongs. This indicates that PbS quantum dots are precipitated in the glass samples prepared in Example 4, and the size of the PbS quantum dots gradually increases with increasing heat treatment temperature or time.

[0195] The quantum dot glass of Example 4, which was heat-treated at 520°C for 10 hours, was tested for luminous efficiency at an excitation wavelength of 900 nm. The test results are shown in Figure 13 , where the solid black squares represent the luminescence spectrum of the 900 nm excitation light source, and the hollow circles represent the aforementioned quantum dot glass 52010. As shown in Figure 13 , under excitation with a 900 nm wavelength light source, the quantum dot glass achieved a luminous efficiency of 55%. This is because the Cl ions effectively passivate the dangling Pb ion bonds on the surface of the PbS quantum dots, thereby effectively improving the quantum dot luminescence efficiency.

[0196] Example 5

[0197] Quantum dot glass was prepared in Example 5 by the following method: providing uniformly mixed raw materials for preparing quantum dot glass, wherein the elemental composition of the raw materials for preparing quantum dot glass conforms to the elemental composition of the raw materials for preparing quantum dot glass in Example 5 in Table 1. The raw materials for preparing quantum dot glass were placed in a crucible and melted at a melting temperature of 1350°C for 40 minutes to obtain a molten glass liquid. After the molten glass liquid was cooled to form a glass precursor, the precursor was transferred to an annealing furnace for annealing at a temperature of 400°C for 5 hours to obtain a yellow transparent glass intermediate. Testing showed that the yellow transparent glass intermediate had no absorption peak in the near-infrared band of visible light.

[0198] The glass intermediate was transferred to a heat treatment furnace and heat treated at 500° C. for 10 hours, thereby precipitating PbS quantum dots in the glass matrix, wherein KBr crystals were distributed on the outer surface of the PbS quantum dots, thereby obtaining quantum dot glass, which was numbered 50010.

[0199] The quantum dot glass 50010 provided in Example 5 was tested for luminous efficiency at an excitation wavelength of 600 nm. The test results are shown in Figure 14 , where the solid black squares represent the luminescence spectrum of the 600 nm excitation light source, and the hollow circles represent the luminescence spectrum of the quantum dot glass 50010. As shown in Figure 14 , under excitation with a 600 nm wavelength light source, the quantum dot glass achieved a luminous efficiency of 39%. This is because the Br ions effectively passivate the dangling Pb ion bonds on the surface of the PbS quantum dots, thereby improving the quantum dot luminescence efficiency.

[0200] Example 6

[0201] Quantum dot glass was prepared in Example 6 by the following method: providing uniformly mixed raw materials for preparing quantum dot glass, wherein the elemental composition of the raw materials for preparing quantum dot glass conforms to the elemental composition of the raw materials for preparing quantum dot glass in Example 6 in Table 1. The raw materials for preparing quantum dot glass were placed in a crucible for melting at a melting temperature of 1400°C for a melting time of 40 minutes to obtain a molten glass liquid. After the molten glass liquid was cooled to form a glass precursor, the precursor was transferred to an annealing furnace for annealing at a temperature of 400°C for 5 hours to obtain a yellow transparent glass intermediate. Testing showed that the yellow transparent glass intermediate had no absorption peak in the near-infrared band of visible light.

[0202] The glass intermediate was transferred to a heat treatment furnace and heat treated at 520° C. for 10 hours, thereby precipitating PbS quantum dots in the glass matrix, wherein NaI crystals were distributed on the outer surface of the PbS quantum dots, thereby obtaining quantum dot glass, which was numbered 52010.

[0203] The quantum dot glass 52010 provided in Example 6 was tested for luminous efficiency at an excitation wavelength of 600 nm. The test results are shown in Figure 15 , where the solid black squares represent the luminescence spectrum of the 600 nm excitation light source, and the hollow circles represent the luminescence spectrum of the quantum dot glass 52010. As shown in Figure 15 , under excitation with a 600 nm wavelength light source, the quantum dot glass achieved a luminous efficiency of 38%. This is because the I ions effectively passivate the dangling Pb ion bonds on the surface of the PbS quantum dots, thereby improving the quantum dot luminescence efficiency.

[0204] Example 7

[0205] Quantum dot glass was prepared in Example 7 by the following method: providing uniformly mixed raw materials for preparing quantum dot glass, wherein the elemental composition of the raw materials for preparing quantum dot glass conforms to the elemental composition of the raw materials for preparing quantum dot glass in Example 7 in Table 1. The raw materials for preparing quantum dot glass were placed in a crucible and melted at a melting temperature of 1400°C for 40 minutes to obtain a molten glass liquid. After the molten glass liquid was cooled to form a glass precursor, it was transferred to an annealing furnace for annealing at a temperature of 400°C for 5 hours to obtain a yellow transparent glass intermediate. Testing showed that the yellow transparent glass intermediate had no absorption peak in the near-infrared band of visible light.

[0206] The glass intermediate was transferred to a heat treatment furnace and heat treated at 530° C. for 10 hours, thereby precipitating PbS quantum dots in the glass matrix, wherein LiI crystals were distributed on the outer surface of the PbS quantum dots, thereby obtaining quantum dot glass, which was numbered 53010.

[0207] The quantum dot glass 53010 provided in Example 7 was tested for luminous efficiency at an excitation wavelength of 600 nm. The test results are shown in Figure 16 , where the solid black squares represent the luminescence spectrum of the 600 nm excitation light source, and the hollow circles represent the luminescence spectrum of the quantum dot glass 53010. As shown in Figure 16 , under excitation with a 600 nm wavelength light source, the quantum dot glass exhibited a luminous efficiency of 31%. This is because the I ions effectively passivate the dangling Pb ion bonds on the surface of the PbS quantum dots, thereby improving the quantum dot luminescence efficiency.

[0208] Example 8

[0209] Quantum dot glass was prepared in Example 8 by the following method: providing uniformly mixed raw materials for preparing quantum dot glass, wherein the elemental composition of the raw materials for preparing quantum dot glass conforms to the elemental composition of the raw materials for preparing quantum dot glass in Example 8 in Table 1. The raw materials for preparing quantum dot glass were placed in a crucible for melting at a melting temperature of 1400°C for a melting time of 40 minutes to obtain a molten glass liquid. After the molten glass liquid was cooled to form a glass precursor, the precursor was transferred to an annealing furnace for annealing at a temperature of 400°C for 5 hours to obtain a yellow transparent glass intermediate. Testing showed that the yellow transparent glass intermediate had no absorption peak in the near-infrared band of visible light.

[0210] The glass intermediate was transferred to a heat treatment furnace and heat treated at 515° C. for 10 hours, thereby precipitating PbSe quantum dots in the glass matrix, wherein NaCl crystals were distributed on the outer surface of the PbSe quantum dots, thereby obtaining quantum dot glass, which was numbered 51510.

[0211] The quantum dot glass 52510 provided in Example 8 was tested for luminous efficiency at an excitation wavelength of 600 nm. The test results are shown in Figure 17 , where the solid black squares represent the luminescence spectrum of the 600 nm excitation light source, and the hollow circles represent the luminescence spectrum of the quantum dot glass 51510. As shown in Figure 17 , under excitation with a 600 nm wavelength light source, the quantum dot glass achieved a luminous efficiency of 33%. This is because the I ions effectively passivate the dangling Pb ion bonds on the surface of the PbSe quantum dots, thereby improving the quantum dot luminescence efficiency.

[0212] The above description is only for the purpose of facilitating those skilled in the art to understand the technical solutions of the present disclosure and is not intended to limit the present disclosure. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present disclosure shall be included in the scope of protection of the present disclosure.

Claims

1. A quantum dot glass raw material, wherein: The quantum dot glass raw material comprises the following elements in molar percentage: Si element: 12.63% to 21.05%; Al element: 1.36% to 8.2%; Zn element: 1.03% to 7.19%; Pb element: 0.03% to 0.68%; O element: 36.33% to 76.36%; G Elements: 0.34% to 2.04%; M elements: 10.7% to 21.41%; N elements: 1.03% to 5.13%; X elements: 0.5% to 3.4%; Wherein, the G element is sulfur element S, selenium element Se or tellurium element Te; M element is an alkali metal element; The N element is an alkaline earth metal element; The X element is a halogen element.

2. The quantum dot glass raw material according to claim 1, wherein: The M element is selected from at least one of Na element, K element and Li element.

3. The quantum dot glass raw material according to claim 1, wherein: The N element is selected from at least one of Sr, Ca and Ba.

4. The quantum dot glass raw material according to claim 1, wherein: The X element is selected from at least one of Cl element, Br element and I element.

5. The quantum dot glass raw material according to any one of claims 1 to 4, wherein: The Si element exists in the form of silicon oxide; The Al element exists in the form of aluminum oxide; The G element is present in at least one of a ZnG form and a G single substance form; The Pb element is present in at least one of the form of lead oxide and the form of single lead; The alkaline earth metal element N is present in at least one of the form of an alkaline earth metal carbonate compound and an alkaline earth metal halide; The alkali metal element M is present in at least one of the form of an alkali metal carbonate, an alkali metal sulfide and an alkali metal halide; The halogen element X is present in at least one of an alkaline earth metal halide form and an alkali metal halide form.

6. The quantum dot glass raw material according to claim 5, wherein: The G element is sulfur element S, and the sulfur element S exists in at least one of the form of ZnS and the form of sulfur element.

7. A method for preparing quantum dot glass, wherein: The method for preparing the quantum dot glass comprises: Providing raw materials for preparing quantum dot glass, wherein the element composition of the raw materials for preparing quantum dot glass conforms to the element composition of the raw materials for preparing quantum dot glass according to any one of claims 1 to 6; The raw materials for preparing the quantum dot glass are melted, and the molten glass liquid is placed in a mold for cooling and forming to obtain a glass precursor; Annealing the glass precursor to obtain a glass intermediate; The glass intermediate is heat-treated to precipitate quantum dots in the glass matrix, thereby obtaining the quantum dot glass.

8. The method for preparing quantum dot glass according to claim 7, wherein: The temperature of the melting treatment is 1350°C to 1500°C, and the time of the melting treatment is 30 minutes to 60 minutes; The annealing treatment is performed at a temperature of 250° C. to 450° C. and for a time of 2 hours to 10 hours.

9. The method for preparing quantum dot glass according to claim 7, wherein: The temperature of the heat treatment is 450° C. to 600° C., and the time of the heat treatment is 1 hour to 48 hours.

10. A method for preparing a quantum dot optical fiber core, wherein: The method for preparing the quantum dot optical fiber core comprises: Providing raw materials for preparing quantum dot glass, wherein the element composition of the raw materials for preparing quantum dot glass conforms to the element composition of the raw materials for preparing quantum dot glass according to any one of claims 1 to 6; The raw materials for preparing the quantum dot glass are melted, and the molten glass liquid is placed in a mold for cooling and forming to obtain a glass precursor; Performing optical fiber drawing processing on the glass precursor to obtain a first optical fiber core preform; Annealing the first optical fiber preform to obtain a second optical fiber core preform; The second optical fiber core preform is heat-treated to precipitate quantum dots in the glass matrix to obtain the quantum dot optical fiber core.

11. The method for preparing a quantum dot optical fiber core according to claim 10, wherein: The temperature of the melting treatment is 1350°C to 1500°C, and the time of the melting treatment is 30 minutes to 60 minutes; The annealing temperature is 250°C to 450°C, and the annealing time is 2 hours to 10 hours; The temperature of the heat treatment is 450° C. to 600° C., and the time of the heat treatment is 1 hour to 48 hours.

12. A quantum dot glass, wherein: The quantum dot glass is prepared by using the quantum dot glass raw material described in any one of claims 1 to 6, or by using the method for preparing the quantum dot glass described in any one of claims 7 to 9; The quantum dot glass includes a glass matrix and a quantum dot system located in the glass matrix, the quantum dot system includes PbG quantum dots and alkali metal halide crystals located on the outer surface of the PbG quantum dots, the alkali metal halide crystals are composed of elements M and elements X, and the G element is sulfur element S, selenium element Se or tellurium element Te.

13. A quantum dot optical fiber, wherein: The quantum dot optical fiber comprises a quantum dot optical fiber core, and the quantum dot optical fiber core is prepared by using the quantum dot glass raw material according to any one of claims 1 to 6, or by using the preparation method of the quantum dot optical fiber core according to any one of claims 10 to 11; The quantum dot optical fiber core includes a glass matrix and a quantum dot system located in the glass matrix, the quantum dot system includes PbG quantum dots and alkali metal halide crystals located on the outer surface of the PbG quantum dots, the alkali metal halide crystals are composed of elements M and elements X, and the G element is sulfur element S, selenium element Se or tellurium element Te.

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