Sb < 3 + >-doped lead-free double perovskite luminescent material, preparation method and application thereof

Abstract

The invention discloses a Sb < 3 + >-doped lead-free double perovskite luminescent material, a preparation method and application thereof.The material takes Rb2K (1-x) InCl6 as a matrix and doped xSb < 3 + > as luminescent ions, the local structure of a crystal is regulated and controlled through ion doping, meanwhile, high crystallinity and controllable size of the crystal are achieved in combination with an anti-solvent mediated crystallization method, and the luminescent material is prepared. Therefore, the light absorption and radiation recombination efficiency of the material is effectively improved. The Sb < 3 + > doped lead-free double perovskite luminescent material disclosed by the invention shows tunable green emission under excitation of ultraviolet light of 320 nm, the color temperature range is 5778-6668 K, and the photoluminescence quantum yield (PLQY) is as high as 93.75%. According to the Sb < 3 + >-doped lead-free double perovskite luminescent material, the chemical general formula of the luminescent material is Rb2K (1-x) InCl6: xSb, and the value range of x in molar stoichiometry is 0% lt; x is less than or equal to 15%.

Description

Technical Field

[0001] The present invention relates to a luminescent material, a preparation method thereof and an application thereof, and more specifically to an Sb 3+ -doped lead-free double perovskite luminescent material, a preparation method thereof and an application thereof, belonging to the technical field of optical materials. Background Art

[0002] In recent years, lead-free perovskite materials have gradually become the focus of research on new-generation luminescent and optoelectronic materials due to their excellent optoelectronic properties and environmentally friendly characteristics. Especially for double perovskite (A2B Ⅰ B Ⅲ X6) structure materials, they are considered an important direction for the development of lead-free perovskites due to their high luminescence efficiency and good structural stability. However, existing lead-free double perovskite luminescent materials generally have problems such as a relatively large optical band gap and low light absorption efficiency, which restrict their further application in the fields of solid-state lighting and display. To improve their luminescence performance, ion doping has become an important regulation method. Existing studies have shown that doping with ns 3+ -type ions such as Sb 3+ and Bi 2 can effectively improve the light absorption and luminescence characteristics of double perovskites. However, current research on Sb-doped double perovskites mostly focuses on single-cation systems, and the effects of alkali metal cations (such as Rb + 、Na + 、K + etc.) on the crystal structure and optical properties of double perovskites have not been fully explored. In addition, existing lead-free double perovskite luminescent materials still face great challenges in aspects such as color regulation of photoluminescence and improvement of luminescence efficiency. Therefore, the development of a new Sb-doped lead-free double perovskite luminescent material, a preparation method thereof and an application thereof has important strategic significance. Summary of the Invention

[0003] In view of the problems and deficiencies of the existing technology, the present invention provides an Sb 3+ -doped lead-free double perovskite luminescent material. This Sb 3+ -doped lead-free double perovskite luminescent material uses Rb2K(1-x)InCl6 as a matrix and dopes xSb 3+ as luminescent ions (where the value range of x in molar stoichiometry is 0% < x ≤ 15). By regulating the local crystal structure through ion doping and combining the anti-solvent-mediated crystallization method (anti-solvent method), high crystallinity and size control of the crystal are achieved, thereby effectively improving the light absorption and radiative recombination efficiency of the material. The Sb 3+The doped lead-free double perovskite luminescent material exhibits tunable green emission under 320 nm ultraviolet excitation, the color temperature ranges from 5778K to 6668K, the photoluminescence quantum yield (PLQY) is as high as 93.75%, and the luminescent material has excellent optical performance and heat quenching resistance, and has wide application prospects in solid state lighting, display technology and optoelectronic devices.

[0004] Meanwhile, the application also provides the Sb 3+ The preparation method of the doped lead-free double perovskite luminescent material is simple in preparation method and process, environment-friendly, low in production cost and easy for large-scale production.

[0005] The application is achieved by the following technical solutions:

[0006] The Sb 3+ The doped lead-free double perovskite luminescent material has a chemical general formula of Rb2K(1-x)InCl6:xSb, wherein x is in a range of 0% < x <= 15% in terms of molar stoichiometry.

[0007] The Sb 3+ The doped lead-free double perovskite luminescent material has a chemical general formula of Rb2K(1-x)InCl6:xSb, wherein x is in a range of 0% < x <= 15% in terms of molar stoichiometry. 3+ The doped lead-free double perovskite luminescent material can realize tunable green light emission under 320 nm ultraviolet light excitation, and the color temperature ranges from 5778K to 6668K.

[0008] The Sb 3+ The doped lead-free double perovskite luminescent material has a chemical general formula of Rb2K(1-x)InCl6:xSb, wherein x is in a range of 0% < x <= 15% in terms of molar stoichiometry.

[0009] The Sb 3+ The preparation method of the doped lead-free double perovskite luminescent material comprises the following steps:

[0010] With Rb source, K source, In source, Sb source and Cl source as raw materials, with HCl or alcohol as solvent, according to the molar stoichiometric ratio of each element in the chemical formula Rb2K(1-x)InCl6:xSb, the raw materials are weighed, the solution containing each element is mixed, stirred, filtered and dried under normal pressure and at 0-90 DEG C by anti-solvent method, and the Sb 3+ The application discloses a lead-free double perovskite luminescent material doped with Sb.

[0011] The Sb 3+ The application further discloses a preparation method of the lead-free double perovskite luminescent material doped with Sb.

[0012] (1) raw material weighing: Rb source, K source, In source, Sb source and Cl source are prepared according to the chemical formula Rb2K(1-x)InCl6:xSb, and the raw materials are weighed according to the molar stoichiometric ratio of each element in the chemical composition formula;

[0013] (2) preparation of precursor solution: Rb source raw material is dissolved in an HCl solution to obtain a precursor solution 1; K source raw material is dissolved in deionized water and an alcohol solution to obtain a precursor solution 2; (1-x) In source raw material and x Sb source raw material are dissolved in an HCl solution to obtain a precursor solution 3;

[0014] (3) anti-solvent method for synthesizing crystals: the precursor solutions 1, 2 and 3 are kept at the same temperature point of 0-90 DEG C, then the precursor 1 and 3 are poured into the precursor solution 2, and the solution is fully reacted and formed into a crystal with complete structure through stirring;

[0015] (4) product post-treatment: the reaction product in the step (3) is filtered, washed with ethanol and dried to obtain the Sb 3+ The application discloses a lead-free double perovskite luminescent material doped with Sb.

[0016] The Sb 3+ The application further discloses a preparation method of the lead-free double perovskite luminescent material doped with Sb.

[0017] The Sb 3+ The application further discloses a preparation method of the lead-free double perovskite luminescent material doped with Sb.

[0018] The Sb 3+ The application discloses a lead-free double perovskite luminescent material doped with Sb.

[0019] Compared with the prior art, the application has the following beneficial effects:

[0020] The present application selects Rb + –K + –In 3+ Three-component system construction A2B Ⅰ B Ⅲ X6 type double perovskite framework, by doping xSb in Rb2K(1-x)InCl6 double perovskite structure 3+ To achieve the tunable green light emission performance of the material in the visible light region. Using anti-solvent mediated crystallization method (anti-solvent method), by accurately controlling the ion species and proportion constituting the crystal, local state is introduced in the crystal lattice to realize emission enhancement, and xSb is doped 3+ To control the optical properties of Rb2K(1-x)InCl6 double perovskite material. Synthesized Sb 3+ Doped lead-free double perovskite photoluminescence material can realize tunable green emission under ultraviolet excitation, and has high photoluminescence quantum yield (PLQY) and good anti-thermal quenching performance. Rb + The synergistic introduction of K + Significantly changes the symmetry of the crystal structure, making the crystal change from the common cubic structure to the more distorted monoclinic structure, which is conducive to the formation of self-trapped exciton (STE) state and improves the radiation recombination probability. In 3+ As the main group B site ion, the electronic structure is stable, and the coordination configuration is regular, which helps to stabilize the crystal framework and reduce the defect concentration. Doped Sb 3+ Ion has 5s 2 The lone pair electron structure can form deep level states in the [Cl–Sb–Cl] bridge, enhancing the absorption of ultraviolet light and realizing high efficiency green light emission. The local structure distortion of the system further promotes the radiation transition between the excited state and the ground state, thereby improving the luminescence intensity. Anti-solvent mediated crystallization method has the advantages of good product crystallinity, controllable particle size, rapid and mild reaction, etc., and is a high-efficiency, environmentally friendly functional crystal preparation technology suitable for large-scale production; the prepared Sb 3+ Doped lead-free double perovskite luminescence material has broad application prospects in the fields of solid-state lighting, display and optical anti-counterfeiting. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 Sb 3+ Doped lead-free double perovskite luminescence material under 320 nm ultraviolet light source excitation.

[0022] Figure 2 Sb 3+ Doped lead-free double perovskite luminescence material CIE chromaticity coordinate diagram.

[0023] Figure 3Sb prepared for Example 1-5 3+ A graph of fluorescence decay curve of the doped lead-free double perovskite luminescent material.

[0024] Figure 4 Sb prepared for Example 4 3+ A graph of quantum yield of the doped lead-free double perovskite luminescent material (Rb2K90%InCl6:10%Sb) under 320 nm excitation. DETAILED DESCRIPTION

[0025] Example 1 (sample labeled: Rb2K97%InCl6:3%Sb)

[0026] A Sb 3+ A doped lead-free double perovskite luminescent material comprising the following components in mole percentage:

[0027]

[0028] This example relates to Sb 3+ The preparation steps of the doped lead-free double perovskite luminescent material are as follows:

[0029] Step 1: raw material preparation: using RbCl, KCl, InCl3, SbCl3, HCl as raw materials, HCl and isopropyl alcohol as solvents, and weighing the materials according to the stoichiometric ratio of each element in the chemical composition formula Rb2K97%InCl6:3%Sb;

[0030] Step 2: preparation of precursor solution 1: dissolve 2 mmol of RbCl in 5 ml of HCl solution, and prepare for use;

[0031] Step 3: preparation of precursor solution 2: dissolve 2 mmol of KCl in 1 ml of deionized water and 4 ml of isopropyl alcohol solution, and prepare for use;

[0032] Step 4: preparation of precursor solution 3: dissolve 0.97 mmol of InCl3 and 0.03 mmol of SbCl3 in 5 ml of HCl solution, and prepare for use;

[0033] Step 5: synthesis of crystals by anti-solvent method: heat the precursor solutions 1, 2, and 3 to 90°C, then simultaneously pour the precursor solutions 1 and 3 into the container of precursor solution 2, and stir for 1.0 min to allow the solution to fully react and form structurally complete crystals;

[0034] Step 6: product collection: filter the reaction product, wash with ethanol, and thoroughly dry to obtain Sb 3+ A doped Rb2KInCl6 double perovskite microcrystalline luminescent material.

[0035] Example 2 (sample labeled Rb2K95%InCl6:5%Sb)

[0036] A Sb 3+ A doped lead-free double perovskite luminescent material comprising the following components in mole percentage:

[0037]

[0038] This embodiment relates to a Sb 3+ The preparation steps of the doped lead-free double perovskite luminescent material are as follows:

[0039] Step 1: raw material preparation: taking RbNO3, KCl, InCl3, Sb2O3, HCl as raw materials, HCl and ethanol as solvents, and weighing the materials according to the stoichiometric ratio of each element in the chemical composition formula Rb2K95%InCl6:5%Sb;

[0040] Step 2: preparation of precursor solution 1: dissolve 3 mmol of RbNO3 in 7.5 ml of HCl solution, and prepare for use;

[0041] Step 3: preparation of precursor solution 2: dissolve 3 mmol of KCl in 1.5 ml of deionized water and 6 ml of ethanol solution, and prepare for use;

[0042] Step 4: preparation of precursor solution 3: dissolve 0.95 mmol of InCl3 and 0.05 mmol of Sb2O3 in 7.5 ml of HCl solution, and prepare for use;

[0043] Step 5: synthesis of crystals by anti-solvent method: heat the precursor solutions 1, 2, and 3 to 50°C, then simultaneously pour the precursor solutions 1 and 3 into the container of precursor solution 2, and stir for 2.0 min to allow the solution to fully react and form structurally complete crystals;

[0044] Step 6: product collection: filter the reaction product, wash with ethanol, and fully dry to obtain a Sb 3+ A doped Rb2KInCl6 double perovskite microcrystal luminescent material.

[0045] Embodiment 3 (sample labeled as Rb2K93%InCl6:7%Sb)

[0046] A Sb 3+ A doped lead-free double perovskite luminescent material comprising the following components in mole percentage:

[0047]

[0048] This embodiment relates to a Sb 3+ The preparation steps of the doped lead-free double perovskite luminescent material are as follows:

[0049] Step 1: Raw material proportioning: Take RbCl, KCl, InNO3, SbNO3, HCl as raw materials, HCl, ethanol as solvent, and weigh the materials according to the stoichiometric ratio of each element in the general formula Rb2K90%InCl6: 10%Sb;

[0050] Step 2: Preparation of precursor solution 1: Dissolve 4 mmol of RbCl in 10 ml of HCl solution, ready for use;

[0051] Step 3: Preparation of precursor solution 2: Dissolve 4 mmol of KCl in 2 ml of deionized water and 6 ml of ethanol solution, ready for use;

[0052] Step 4: Preparation of precursor solution 3: Dissolve 0.93 mmol of InNO3 and 0.07 mmol of SbNO3 in 10 ml of HCl solution, ready for use;

[0053] Step 5: Synthesis of crystals by anti-solvent method: Keep precursor solutions 1, 2, and 3 at ℃, then pour precursor 1 and 3 into the container of precursor 2 at the same time, and stir for 3.0 min to allow the solution to fully react and form structurally complete crystals;

[0054] Step 6: Product collection: Filter the reaction product, wash with ethanol, and dry thoroughly to obtain Sb 3+ Doped Rb2KInCl6 double perovskite microcrystalline luminescent material

[0055] Example 4 (sample labeled as Rb2K90%InCl6: 10%Sb)

[0056] A Sb 3+ Doped lead-free double perovskite luminescent material, comprising the following components in mole percentage:

[0057]

[0058] This example relates to Sb 3+ The preparation steps of the doped lead-free double perovskite luminescent material are as follows:

[0059] Step 1: Raw material proportioning: Take Rb2(C2O4)3·10H2O, KCl, InCl3, C2O4·Sb2O3, HCl as raw materials, HCl, isopropanol as solvent, and weigh the materials according to the stoichiometric ratio of each element in the general formula Rb2K90%InCl6: 10%Sb;

[0060] Step 2: Preparation of precursor solution 1: Dissolve 5 mmol of Rb2(C2O4)3·10H2O in 12.5 ml of HCl solution, ready for use;

[0061] Step 3: Preparation of precursor solution 2: 5 mmol of KCl was dissolved in 2.5 ml of deionized water and 10 ml of isopropyl alcohol solution, ready for use;

[0062] Step 4: Preparation of precursor solution 3: 0.9 mmol of InCl3 and 0.1 mmol of C2O4·Sb2O3 were dissolved in 12.5 ml of HCl solution, ready for use;

[0063] Step 5: Synthesis of crystals by anti-solvent method: precursor solutions 1, 2, and 3 were kept at 25°C, and then precursor 1 and 3 were poured into the container of precursor 2 at the same time, and the solution was stirred for 2.5 min to fully react and form crystals with complete structure;

[0064] Step 6: Product collection: the reaction product was filtered, washed with ethanol, and fully dried to obtain Sb 3+ Doped Rb2KInCl6 double perovskite microcrystalline luminescent material.

[0065] Example 5 (sample labeled as Rb2K85%InCl6: 15% Sb)

[0066] A Sb 3+ Doped lead-free double perovskite luminescent material, comprising the following components in mole percentage:

[0067]

[0068] This example relates to a Sb 3+ The preparation steps of the doped lead-free double perovskite luminescent material are as follows:

[0069] Step 1: Raw material preparation: taking RbNO3, KCl, InCl3, C2O4·Sb2O3, and HCl as raw materials, and HCl and isopropyl alcohol as solvents, the materials were weighed according to the stoichiometric ratio of each element in the chemical composition formula Rb2K85%InCl6: 15% Sb;

[0070] Step 2: Preparation of precursor solution 1: 3 mmol of RbNO3 was dissolved in 7.5 ml of HCl solution, ready for use;

[0071] Step 3: Preparation of precursor solution 2: 3 mmol of KCl was dissolved in 1.5 ml of deionized water and 6 ml of isopropyl alcohol solution, ready for use;

[0072] Step 4: Preparation of precursor solution 3: 0.85 mmol of InCl3 and 0.15 mmol of C2O4·Sb2O3 were dissolved in 7.5 ml of HCl solution, ready for use;

[0073] Step 5: Synthesis of crystals by anti-solvent method: precursor solution 1, 2, 3 were heated to 75 °C, then precursor 1 and 3 were poured into the container of precursor 2 at the same time, and the solution was stirred for 1.5 min to fully react and form crystals with complete structure;

[0074] Step 6: Product collection: the reaction product was filtered, washed with ethanol and fully dried to obtain Sb 3+ Doped Rb2KInCl6 double perovskite microcrystalline luminescent material.

[0075] Example 6

[0076] This example relates to Sb 3+ The luminescent performance analysis of doped lead-free double perovskite luminescent material double perovskite microcrystals was evaluated using photoluminescence excitation and emission spectra.

[0077] Test method:

[0078] The photoluminescence excitation and emission spectra were measured using a fluorescence spectrometer (Edinburgh FLS-1000), and the results are shown in Figure 1 .

[0079] As shown in Figure 1 , the system Sb 3+ The doped lead-free double perovskite luminescent material exhibits significant 508 nm visible green emission under 320 nm ultraviolet excitation. With the increase of Sb 3+ doping concentration, the emission intensity gradually increases and reaches the optimal emission intensity at a doping concentration of 10 mol%. This indicates that Sb 3+ ions effectively improve the photoluminescence efficiency of the material. When the doping concentration is too high (more than 10 mol%), concentration quenching occurs, and the emission intensity begins to decrease. This may be due to the increased interaction between ions caused by high concentration of Sb 3+ , resulting in decreased energy transfer efficiency and increased non-radiative recombination, which in turn inhibits the luminescence intensity. In addition, too high a concentration may also lead to an increase in crystal defects, further affecting the luminescence performance. Therefore, a Sb 3+ doping concentration of 10 mol% is the optimal luminescence concentration for this material. The results show that Sb 3+ doped Rb2KInCl6 successfully realizes effective green luminescence of element-doped double perovskite materials, expanding the application potential of the material.

[0080] Example 7

[0081] This example relates to Sb 3+ The CIE chromaticity coordinate analysis of doped lead-free double perovskite luminescent material was evaluated using chromaticity coordinates Figure 2 .

[0082] Test method:

[0083] The excitation, emission, and decay spectra of the samples were analyzed and tested using a fluorescence spectrometer (FLS 980, Edinburgh Instruments, UK), and the corresponding chromaticity coordinates were obtained using CIE1931 software based on the spectral data.

[0084] As shown in the figure, the CIE chromaticity coordinates and color temperature of samples S1-S5 were calculated. Under ultraviolet light (320nm) excitation, all samples exhibited stable green light emission. With the increase of Sb... 3+ With increasing doping concentration, the green light emission characteristics of the Rb₂KInCl₆ sample gradually improved. At 3% doping, the CIE coordinates were (0.3204, 0.4994), and the emitted green light was relatively soft. As the doping concentration increased to 5%, 7%, and 10%, the CIE coordinates gradually shifted towards (0.2863, 0.48), and the intensity of the emitted green light significantly increased, indicating that increasing the doping concentration effectively improved the green light emission performance. Particularly at a 10% doping concentration, the material exhibited the best green light emission effect, with the strongest emission intensity and a color temperature of approximately 6668K, making it suitable for high-efficiency green light emission applications. However, when Sb… 3+ When the doping concentration exceeds 10%, the CIE coordinates are (0.2993, 0.4908), and the emission intensity begins to decrease, exhibiting concentration quenching. This indicates that a 10% doping concentration is ideal for obtaining the optimal green light emission intensity; exceeding this concentration leads to a decrease in energy transfer efficiency, thereby suppressing the luminescence intensity. Therefore, the 10% doped sample exhibits the best performance in terms of efficient green light emission.

[0085] Example 8

[0086] This embodiment involves Sb 3+ The fluorescence decay behavior of lead-free double perovskite luminescent materials was analyzed, and the fluorescence decay curves were used for evaluation.

[0087] Test method:

[0088] The attenuation spectra of the samples were analyzed and tested using a fluorescence spectrometer (FLS 980, Edinburgh Instruments, UK).

[0089] The fluorescence lifetime curves of samples S1-S5 were measured (e.g. Figure 3 (As shown). Sb 3+Fluorescence lifetime of doped Rb2KInCl6 double perovskite under 320 nm excitation. The fluorescence lifetime of the samples is in the microsecond range, which is a characteristic of STEs. As the Sb doping concentration increases from 3% to 10%, the fluorescence lifetime of the crystal increases from 3.988 μs to 4.587 μs. The increase in fluorescence lifetime with increasing doping concentration is attributed to the increase in SbCl6 octahedral emission centers. The decrease in fluorescence lifetime at higher Sb ion concentrations is due to fluorescence quenching. The severe lattice distortion caused by high Sb ion concentrations leads to an increase in internal defects, which reduces the fluorescence intensity and fluorescence lifetime.

[0090] Example 9

[0091] This example relates to Sb 3+ Quantum yield analysis of doped lead-free double perovskite luminescent materials. The quantum yield test was used for analysis

[0092] Test method:

[0093] The quantum yield was measured using a fluorescence spectrometer (Edinburgh FLS-1000).

[0094] Upon testing the 10% Sb 3+ doped lead-free double perovskite luminescent material sample, it was found to exhibit a photoluminescence quantum yield (PLQY) of 93.75% under 320 nm ultraviolet excitation. This high quantum yield indicates that the sample efficiently converts most of the absorbed ultraviolet light into visible light emission with minimal energy loss. The high quantum yield of the material implies a very high optical efficiency, enabling strong green light emission at relatively low excitation energy, which is crucial for high-efficiency green light emission applications. The achievement of high quantum yield is attributed to the optimized performance of the material at a 10% doping concentration. At this concentration, Sb 3+ doped ions effectively enhance energy transfer efficiency, reduce non-radiative recombination processes, and promote radiative transitions of excited states, resulting in significantly improved photoluminescence efficiency. This high PLQY value makes the material have a wide application potential in solid-state lighting, display technology, and optoelectronic devices.

[0095] In summary, the Sb 3+ doped lead-free double perovskite luminescent material exhibits significant advantages over existing technologies in the field of high-efficiency green light emission. Its photoluminescence quantum yield of up to 93.75% and color temperature range of 5778 K-6668 K, as well as strong green light emission under 320 nm ultraviolet excitation, indicate that the material has extremely high superiority in light response efficiency. Through Sb 3+ doping, the material can achieve tunable green emission, and the luminescence intensity increases with the optimization of doping concentration, especially at a 10% doping concentration. In addition, Sb3+ The doped lead-free double perovskite luminescent material sample also exhibits strong thermal stability, and can still maintain high luminescent performance in a high-temperature environment. The green emission purity of the material is high, and the concentration quenching phenomenon is low, which shows wide application potential in the fields of solid-state lighting, display technology and optoelectronic devices.

Claims

1. A type of Sb 3+ Lead-free doped double perovskite luminescent material, characterized in that, The general chemical formula of the luminescent material is Rb₂K(1-x)InCl₆:xSb, where x takes values ​​in molar stoichiometry ranging from 0%. <x≤15%。 2. The Sb according to claim 1 3+ Lead-free doped double perovskite luminescent material, characterized in that The Sb 3+ Lead-free doped double perovskite luminescent materials can achieve tunable green emission under 320nm ultraviolet light excitation, with a color temperature range of 5778K-6668K.

3. The Sb according to claim 1 3+ Lead-free doped double perovskite luminescent material, characterized in that, The luminescent material is prepared from raw materials including Rb, K, In, Sb, and Cl sources, according to the molar stoichiometric ratio of each element in the general chemical formula Rb₂K(1-x)InCl₆:xSb, where x ranges from 0%. <x≤15%。 4. The Sb according to claim 3 3+ Lead-free doped double perovskite luminescent material, characterized in that, The Rb source is provided by at least one of the following: oxides, chlorides, oxalates, carbonates, and nitrates containing Rb; the K source is provided by at least one of the following: oxides, chlorides, oxalates, carbonates, and nitrates containing K; the In source is provided by at least one of the following: oxides, chlorides, oxalates, carbonates, and nitrates containing In; the Sb source is provided by at least one of the following: oxides, chlorides, oxalates, carbonates, and nitrates containing Sb; and the Cl source is provided by at least one of the following: hydrochloric acid containing Cl or chlorides of Rb, K, In, and Sb sources.

5. A Sb according to any one of claims 1-4 3+ A method for preparing lead-free doped double perovskite luminescent materials, characterized in that, Includes the following steps: Using Rb, K, In, Sb, and Cl sources as raw materials, and HCl or alcohols as solvents, the raw materials are weighed according to the molar stoichiometric ratio of each element in the general chemical formula Rb₂K(1-x)InCl₆:xSb. The solutions containing each element are mixed, stirred, filtered, and dried using an anti-solvent method under normal pressure and at temperatures ranging from 0℃ to 90℃ to obtain Sb. 3+ Lead-free double perovskite luminescent material.

6. The Sb according to claim 5 3+ A method for preparing lead-free doped double perovskite luminescent materials, characterized in that, Includes the following steps: (1) Weighing raw materials: Prepare raw materials for Rb source, K source, In source, Sb source and Cl source according to the chemical formula Rb2K(1-x)InCl6:xSb, and weigh the materials according to the molar stoichiometric ratio of each element in the general chemical formula. (2) Preparation of precursor solutions: Dissolve the Rb-containing raw material in HCl solution and mix evenly to obtain precursor solution 1; Dissolve the K-containing raw material in deionized water and alcohol solution and mix evenly to obtain precursor solution 2; Dissolve the (1-x)In-containing raw material and xSb-containing raw material in HCl solution and mix evenly to obtain precursor solution 3; (3) Synthesis of crystals by antisolvent method: First, keep the precursor solutions 1, 2 and 3 at the same temperature point between 0℃ and 90℃. Then, pour the precursors 1 and 3 into the precursor solution 2 at the same time, stir to allow the solution to react fully and form a crystal with a complete structure. (4) Post-processing of the product: The reaction product from step (3) is filtered, washed with ethanol and dried to obtain Sb. 3+ Lead-free double perovskite luminescent material.

7. The Sb according to claim 5 or 6 3+ A method for preparing lead-free doped double perovskite luminescent materials, characterized in that, The alcohols mentioned are isopropanol or ethanol.

8. The Sb according to claim 6 3+ A method for preparing lead-free doped double perovskite luminescent materials, characterized in that, The stirring time mentioned in step (3) is 1-3 minutes.

9. A Sb according to any one of claims 1-4 3+ Applications of lead-free double perovskite luminescent materials in solid-state lighting, display technology, or optoelectronic devices.

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