A Eu 3+ Ionically activated red luminescent material, method for its preparation and use

Abstract

This disclosure proposes an Eu 3+ This paper describes ion-activated red luminescent materials, their preparation methods, and applications, belonging to the field of inorganic luminescent materials technology. The chemical formula of the red luminescent material is Ba₄GdMgNbWO₃. 12 :xEu, where x is Eu 3+ Replace Gd 3+ The number of moles, and 0.003 ≤ x ≤ 0.40. This disclosure is in Eu 3+ Using tungstate oxide as a matrix in doped phosphors not only improves light absorption but also enhances the emission characteristics and stability of the phosphor, thus improving its application performance and quality. This red-emitting material can be excited by ultraviolet to blue light (230–470 nm) and emits a sharp spectrum with a peak wavelength of 613 nm. The emitted light exhibits pure red color, high luminous intensity, and good temperature stability. Furthermore, this red-emitting material can be combined with ultraviolet, near-ultraviolet, or blue semiconductor chips to fabricate high-performance multicolor LED lighting devices.

Description

Technical Field

[0001] This disclosure belongs to the field of inorganic luminescent materials technology, specifically relating to a Eu... 3+ Ion-activated red luminescent materials, their preparation methods, and applications. Background Technology

[0002] Rare earth elements possess relatively stable f-electron orbitals in their atomic structures. Interactions occur between the energy levels of these different orbitals, resulting in complex and diverse spectral characteristics. Compared to typical transition metal ions, rare earth ions more readily undergo electronic transitions, exhibiting greater potential for photon absorption and emission. Therefore, phosphors activated by rare earth ions can emit spectra of different wavelengths, producing colorful luminescent effects and playing a crucial role in fields such as light emission and displays.

[0003] Among rare earth activated ions, europium ions (Eu) are... 3+ [Xe]4f is the most important red light activator, and its ground-state electronic configuration is [Xe]4f. 6 In the excited state, it emits a strong red light originating from the 4f-4f transition, and this light emission is concentrated and of pure red hue. Eu 3+ It can be excited to an excited state by absorbing high-energy photons such as ultraviolet or blue light, and then emits red fluorescence. This luminescent property makes it widely used in fluorescent materials, optical display devices, and biological fluorescent labeling. However, in Eu... 3+ In activated phosphors, the matrix often absorbs the excitation energy of ultraviolet-visible wavelengths and then transfers that excitation energy to Eu. 3+ To achieve its red light emission, Eu is emitted in the ultraviolet-visible wavelength range. 3+ Its light absorption resonance efficiency is very low, which further leads to its low luminous efficiency. Summary of the Invention

[0004] This disclosure aims to at least address one of the technical problems existing in the prior art, and to provide an Eu 3+ Ion-activated red luminescent materials, their preparation methods, and applications.

[0005] One aspect of this disclosure is to provide an Eu 3+ Ion-activated red luminescent material, wherein the chemical formula of the red luminescent material is Ba4GdMgNbWO3. 12 :xEu, where x is Eu 3+ Replace Gd 3+ The number of moles, and 0.003≤x≤0.40.

[0006] Optionally, the red luminescent material can emit red light with a sharp characteristic peak at 613 nanometers when excited by ultraviolet-blue light.

[0007] In another aspect of this disclosure, a method for preparing Eu as described above is proposed. 3+ A method for ion-activated red luminescent materials, the method comprising:

[0008] According to the chemical formula Ba4GdMgNbWO 12 The stoichiometric ratio of each element in xEu is determined by weighing out compounds containing barium ions, gadolinium ions, magnesium ions, niobium ions, tungsten ions, and europium ions, respectively, where 0.003≤x≤0.40. The weighed compounds are ground and mixed evenly to obtain the initial raw material mixture.

[0009] The initial raw material mixture is pre-sintered for the first time in air atmosphere at a sintering temperature of 300℃~600℃ for 1~5 hours. The sintered product is then naturally cooled to room temperature and thoroughly ground to ensure uniform mixing, thus obtaining the first pre-sintered mixture.

[0010] The first pre-sintered mixture was subjected to a second sintering in air atmosphere at a sintering temperature of 800℃~1000℃ for 1~10 hours. The sintered product was then naturally cooled to room temperature to obtain the second pre-sintered mixture.

[0011] The second pre-sintered mixture was subjected to a third sintering in air atmosphere at a temperature of 1000℃~1350℃ for 3~10 hours. The sintered product was then naturally cooled to room temperature to obtain an Eu... 3+ Ion-activated red luminescent materials.

[0012] Optionally, the compound containing barium ions is one of barium oxide, barium nitrate, and barium carbonate.

[0013] Optionally, the compound containing gadolinium ions is one of gadolinium oxide, gadolinium nitrate, and gadolinium carbonate.

[0014] Optionally, the magnesium-containing compound is one of basic magnesium carbonate tetrahydrate, magnesium nitrate, magnesium oxide, and magnesium hydroxide.

[0015] Optionally, the compound containing niobium ions is one of niobium pentoxide, niobium pentachloride, and niobium hydroxide.

[0016] Optionally, the compound containing tungsten ions is one of tungsten oxide or ammonium tungstate.

[0017] Optionally, the compound containing europium ions is europium oxide.

[0018] Another aspect of this disclosure is the proposal of an Eu as described above. 3+Ion-activated red light-emitting materials are applied to white light-emitting LEDs excited by near-ultraviolet and blue light semiconductor chips.

[0019] This disclosure proposes an Eu 3+ Ion-activated red luminescent materials, their preparation methods, and applications. The chemical formula of the red luminescent material is Ba₄GdMgNbWO₃. 12 :xEu, where x is Eu 3+ Replace Gd 3+ The number of moles, and 0.003 ≤ x ≤ 0.40. This disclosure is in Eu 3+ Using tungstate oxide as a matrix in doped phosphors can not only improve light absorption capacity, but also enhance the emission characteristics and stability of fluorescent materials, which is beneficial to improving the application performance and quality of phosphors. Attached Figure Description

[0020] Figure 1 This is a flowchart of the Eu3+ ion-activated red luminescent material according to an embodiment of the present disclosure;

[0021] Figure 2 The comparison results are shown between the XRD diffraction patterns of the samples prepared in Examples 1, 2, 3, and 4 of this disclosure and the X-ray diffraction standard card PDF#33-1069.

[0022] Figure 3 The excitation and emission spectra of the sample prepared in Example 1 of this disclosure are shown.

[0023] Figure 4 The luminescence decay curve of the sample prepared in Example 1 of this disclosure;

[0024] Figure 5 The excitation and emission spectra of the sample prepared in Example 2 of this disclosure are shown.

[0025] Figure 6 The luminescence decay curve of the sample prepared in Example 2 of this disclosure;

[0026] Figure 7 The excitation and emission spectra of the sample prepared in Example 3 of this disclosure are shown.

[0027] Figure 8 The luminescence decay curve of the sample prepared in Example 3 of this disclosure;

[0028] Figure 9 The excitation and emission spectra of the sample prepared in Example 4 of this disclosure are shown.

[0029] Figure 10 This is the luminescence decay curve of the sample prepared in Example 4 of this disclosure. Detailed Implementation

[0030] To enable those skilled in the art to better understand the technical solutions of this disclosure, the disclosure will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are only for explaining this disclosure and are not intended to limit the disclosure. The described embodiments are some, but not all, of the embodiments of this disclosure. Based on the described embodiments of this disclosure, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this disclosure.

[0031] One aspect of this disclosure is to provide an Eu 3+ An ion-activated red luminescent material with the chemical formula Ba4GdMgNbWO3 12 :xEu, where x is the europium ion (Eu) 3+ Replacement of gadolinium ions (Gd) 3+ The number of moles of ), and 0.003≤x≤0.40.

[0032] It should be understood that the choice of substrate has an impact on Eu 3+ Activated phosphors are crucial. Among common oxide matrices, tungstates are one of the most effective, primarily because tungstate oxides possess a wide light absorption range, effectively absorbing ultraviolet-visible light and light energy across various wavelengths, thereby improving the luminescence efficiency of the phosphor material. Furthermore, tungstate oxides exhibit high thermal and chemical stability, ensuring the stability and durability of the phosphor under different environmental and lighting conditions. Therefore, this embodiment proposes a phosphor using tungstate as a matrix and europium ions (Eu) as the active component. 3+ Phosphors used as activators.

[0033] In this embodiment, the matrix material has excellent light absorption in the ultraviolet-visible wavelength range, and the matrix material and Eu... 3+ The energy transfer efficiency between them is high; furthermore, the matrix material has WO6 octahedrons and NbO6 octahedrons in its lattice, which enhances the lattice strength, thus allowing gadolinium ions (Gd) in the matrix to transfer energy efficiently. 3+ ), magnesium ions (Mg 2+ ) and niobium ions (Nb 5+ Randomly and uniformly occupying the same octahedral lattice position greatly enhances the perturbation of the matrix crystal field, which is beneficial to Eu. 3+ of 5 D0→ 7 The F2 luminescence transition has pure luminous color and high luminous efficiency.

[0034] The red luminescent material of this embodiment can emit red light with a sharp characteristic peak at 613 nanometers when excited by ultraviolet-blue light.

[0035] like Figure 1 As shown, in another aspect, this disclosure provides an Eu... 3+ The preparation method S100 for ion-activated red luminescent materials specifically includes the following steps S110 to S140:

[0036] S110, according to the chemical formula Ba4GdMgNbWO 12 The stoichiometric ratios of each element in xEu (0.003≤x≤0.40) are determined by weighing out the amounts containing barium ions (Ba). 2+ Compounds of gadolinium ions (Gd) 3+ Compounds of magnesium ions (Mg) 2+ Compounds of niobium ions (Nb) 5+ ) compounds, tungsten ions (W 6+ Compounds of ) and europium ions (Eu) 3+ The compound is weighed and ground and mixed evenly to obtain an initial raw material mixture.

[0037] In some preferred embodiments, barium ions (Ba) are contained. 2+ The compound is one of barium oxide, barium nitrate, and barium carbonate. For example, barium carbonate is preferred.

[0038] In some other preferred embodiments, gadolinium ions (Gd) are included. 3+ The compound is one of gadolinium oxide, gadolinium nitrate, and gadolinium carbonate. For example, gadolinium oxide is preferred.

[0039] In some other preferred embodiments, magnesium ions (Mg) are included. 2+ The compound is one of basic magnesium carbonate tetrahydrate, magnesium nitrate, magnesium oxide, and magnesium hydroxide. For example, basic magnesium carbonate tetrahydrate is preferred.

[0040] In some other preferred embodiments, niobium ions (Nb) are included. 5+ The compound is one of niobium pentoxide, niobium pentachloride, and niobium hydroxide. For example, niobium pentoxide is preferred.

[0041] In some other preferred embodiments, tungsten ions (W) are included. 6+ The compound is one of tungsten oxide and ammonium tungstate. For example, ammonium tungstate is preferred.

[0042] S120. The weighed initial raw material mixture is pre-sintered for the first time in air atmosphere at a sintering temperature of 300℃~600℃ and a sintering time of 1~5 hours. The sintered product is naturally cooled to room temperature and then thoroughly ground to make it uniformly mixed to obtain the first pre-sintered mixture.

[0043] In some preferred embodiments, the temperature of the first pre-sintering is preferably 300°C, 350°C, 400°C, 500°C, 600°C, etc., and the sintering time is preferably 1 hour, 2 hours, 3 hours, 4 hours, 5 hours, etc.

[0044] S130. The first pre-sintered mixture is subjected to a second sintering in air atmosphere at a sintering temperature of 800℃~1000℃ for 1~10 hours. The sintered product is then naturally cooled to room temperature to obtain the second pre-sintered mixture.

[0045] In some preferred embodiments, the temperature of the second pre-sintering is preferably 800℃, 900℃, 950℃, 1000℃, etc., and the sintering time is preferably 1 hour, 3 hours, 4 hours, 5 hours, 7 hours, 10 hours, etc.

[0046] S140. The second pre-sintered mixture is subjected to a third sintering in air atmosphere at a sintering temperature of 1000℃~1350℃ for 3~10 hours. The sintered product is then naturally cooled to room temperature to obtain an Eu... 3+ Ion-activated red luminescent materials.

[0047] In some preferred embodiments, the temperature of the third pre-sintering is preferably 1000℃, 1100℃, 1200℃, 1250℃, 1300℃, 1350℃, etc., and the sintering time is preferably 3 hours, 5 hours, 7 hours, 10 hours, etc.

[0048] The preparation method of this embodiment is simple, low-cost, pollution-free, and environmentally friendly, with no waste gas or waste liquid emissions. It also features low sintering temperature, energy saving, and ease of production.

[0049] Another aspect of this disclosure is the proposal of an Eu as described above. 3+ Ion-activated red light-emitting materials are applied to white light-emitting LEDs excited by near-ultraviolet and blue light semiconductor chips.

[0050] It should be understood that the red luminescent material based on this embodiment has pure red luminescence and high luminous efficiency. It can emit red light with a sharp characteristic peak located at 613 nanometers when excited in the ultraviolet to blue light band. Therefore, the red luminescent material can be applied to various lighting and display devices, especially to white luminescent LEDs excited by near-ultraviolet and blue light semiconductor chips.

[0051] The Eu will be further explained below with reference to specific embodiments. 3+ Ion-activated red luminescent materials and their properties:

[0052] Example 1

[0053] In this example, Eu 3+The preparation method of ion-activated red luminescent materials includes the following steps:

[0054] S1, based on the chemical formula Ba4GdMgNbWO3 12 The stoichiometric ratios of each element in 0.003Eu were determined by weighing out the following: 31.574 g of barium carbonate, 7.228 g of gadolinium oxide, 0.021 g of europium oxide, 3.885 g of basic magnesium carbonate tetrahydrate, 5.316 g of niobium pentoxide, and 10.141 g of ammonium tungstate. The weighed raw materials were then placed in a mortar and ground until homogeneous to obtain the initial raw material mixture.

[0055] S2. Then, the initial raw material mixture obtained in step S1 is subjected to a first pre-calcination in air atmosphere. The calcination temperature is 300℃ and the calcination time is 5 hours. The calcination furnace is naturally cooled to room temperature. The sample is taken out and thoroughly ground and mixed again to obtain the first pre-sintered mixture.

[0056] S3. The first pre-sintered mixture is calcined for the second time in air atmosphere at a temperature of 800°C for 10 hours. The calcination furnace is then allowed to cool naturally to room temperature. The sample is then taken out again and thoroughly ground and mixed to obtain the second pre-sintered mixture.

[0057] S4. The second pre-sintered mixture is calcined for the third time in air at a temperature of 1350℃ for 3 hours. The calcination furnace is then allowed to cool naturally to room temperature, thus completing the sintering preparation of the sample and obtaining an Eu... 3+ Ion-activated red luminescent materials.

[0058] See appendix Figure 2 The image shown is an X-ray powder diffraction pattern of the sample prepared according to Example 1 of this invention, which shows that the sample is a single-phase material.

[0059] See appendix Figure 3 The photoluminescence spectrum of the sample prepared according to Example 1 shows that the sample exhibits good excitation in the ultraviolet-blue light range, and its emission is a sharp red emission spectrum with a peak at 613 nm.

[0060] See appendix Figure 4 The figure shows the luminescence decay curve of the sample prepared according to Example 1. Its luminescence lifetime is 1.51 milliseconds, which is Eu. 3+ The characteristic luminescence decay of ions can meet the needs of luminescent displays without exhibiting afterglow.

[0061] Example 2

[0062] In this example, Eu 3+ The preparation method of ion-activated red luminescent materials includes the following steps:

[0063] S1, based on the chemical formula Ba4GdMgNbWO3 12 To determine the stoichiometric ratio of each element in 0.15Eu, weigh out the following: 7.893 g of barium carbonate, 1.541 g of gadolinium oxide, 1.264 g of europium oxide, 0.971 g of basic magnesium carbonate tetrahydrate, 1.329 g of niobium pentoxide, and 2.535 g of ammonium tungstate. Grind and mix these raw materials in a mortar until homogeneous to obtain the initial raw material mixture.

[0064] S2. Then, the initial raw material mixture obtained in step S1 is subjected to a first pre-calcination in air atmosphere. The calcination temperature is 600℃ and the calcination time is 1 hour. The calcination furnace is naturally cooled to room temperature. The sample is taken out and thoroughly ground and mixed again to obtain the first pre-sintered mixture.

[0065] S3. The first pre-sintered mixture is calcined for the second time in air atmosphere at a temperature of 1000℃ for 1 hour. The calcination furnace is then allowed to cool naturally to room temperature. The sample is then taken out again and thoroughly ground and mixed to obtain the second pre-sintered mixture.

[0066] S4. The second pre-sintered mixture is calcined for the third time in air at a temperature of 1000℃ for 10 hours. The calcination furnace is then allowed to cool naturally to room temperature, thus completing the sintering preparation of the sample and obtaining an Eu... 3+ Ion-activated red luminescent materials.

[0067] See appendix Figure 2 The image shown is an X-ray powder diffraction pattern of the sample prepared according to Example 2 of this invention, which shows that the sample is a single-phase material.

[0068] See appendix Figure 5 The photoluminescence spectrum of the sample prepared according to Example 2 shows that the sample exhibits good excitation in the ultraviolet-blue light range, and its emission is a sharp red emission spectrum with a peak at 613 nm.

[0069] See appendix Figure 6 The figure shows the luminescence decay curve of the sample prepared according to Example 2 of this paper. Its luminescence lifetime is 1.33 milliseconds, which is Eu. 3+ The characteristic luminescence decay of ions can meet the needs of luminescent displays without exhibiting afterglow.

[0070] Example 3

[0071] In this example, Eu 3+ The preparation method of ion-activated red luminescent materials includes the following steps:

[0072] S1, based on the chemical formula Ba4GdMgNbWO3 12To determine the stoichiometric ratio of each element in 0.3Eu, weigh out the following: 6.315 g of barium carbonate, 1.015 g of gadolinium oxide, 0.422 g of europium oxide, 0.777 g of basic magnesium carbonate tetrahydrate, 1.063 g of niobium pentoxide, and 2.028 g of ammonium tungstate. Grind and mix these raw materials in a mortar until homogeneous to obtain the initial raw material mixture.

[0073] S2. Then, the initial raw material mixture obtained in step S1 is subjected to a first pre-calcination in air atmosphere. The calcination temperature is 350℃ and the calcination time is 3 hours. The calcination furnace is naturally cooled to room temperature. The sample is taken out and thoroughly ground and mixed again to obtain the first pre-sintered mixture.

[0074] S3. The first pre-sintered mixture is calcined for the second time in air atmosphere at a temperature of 900°C for 5 hours. The calcination furnace is then allowed to cool naturally to room temperature. The sample is then taken out again and thoroughly ground and mixed to obtain the second pre-sintered mixture.

[0075] S4. The second pre-sintered mixture is calcined for the third time in air at a temperature of 1250℃ for 5 hours. The calcination furnace is then allowed to cool naturally to room temperature, thus completing the sintering preparation of the sample and obtaining an Eu... 3+ Ion-activated red luminescent materials.

[0076] See appendix Figure 2 The image shown is an X-ray powder diffraction pattern of the sample prepared according to Example 3 of this invention. The results show that the sample is a single-phase material.

[0077] See appendix Figure 7 The photoluminescence spectrum of the sample prepared according to Example 3 shows that the sample exhibits good excitation in the ultraviolet-blue light range, and its emission is a sharp red emission spectrum with a peak at 613 nm.

[0078] See appendix Figure 8 The figure shows the luminescence decay curve of the sample prepared according to Example 3 of this invention. Its luminescence lifetime is 1.11 milliseconds, which is Eu. 3+ The characteristic luminescence decay of ions can meet the needs of luminescent displays without exhibiting afterglow.

[0079] Example 4

[0080] In this example, Eu 3+ The preparation method of ion-activated red luminescent materials includes the following steps:

[0081] S1, based on the chemical formula Ba4GdMgNbWO3 12To determine the stoichiometric ratio of each element in 0.4Eu, weigh out the following: 5.526 g of barium carbonate, 0.761 g of gadolinium oxide, 0.493 g of europium oxide, 0.679 g of basic magnesium carbonate tetrahydrate, 0.931 g of niobium pentoxide, and 1.775 g of ammonium tungstate. Grind and mix these raw materials in a mortar until homogeneous to obtain the initial raw material mixture.

[0082] S2. Then, the initial raw material mixture obtained in step S1 is subjected to a first pre-calcination in air atmosphere. The calcination temperature is 350℃ and the calcination time is 5 hours. The calcination furnace is naturally cooled to room temperature. The sample is taken out and thoroughly ground and mixed again to obtain the first pre-sintered mixture.

[0083] S3. The first pre-sintered mixture is calcined for the second time in air atmosphere at a temperature of 900°C for 5 hours. The calcination furnace is then allowed to cool naturally to room temperature. The sample is then taken out again and thoroughly ground and mixed to obtain the second pre-sintered mixture.

[0084] S4. The second pre-sintered mixture is calcined for the third time in air at a temperature of 1250℃ for 5 hours. The calcination furnace is then allowed to cool naturally to room temperature, thus completing the sintering preparation of the sample and obtaining an Eu... 3+ Ion-activated red luminescent materials.

[0085] See appendix Figure 2 The image shown is an X-ray powder diffraction pattern of the sample prepared according to Example 4 of this invention. The results show that the sample is a single-phase material.

[0086] See appendix Figure 9 The photoluminescence spectrum of the sample prepared according to Example 4 shows that the sample exhibits good excitation in the ultraviolet-blue light range, and its emission is a sharp red emission spectrum with a peak at 613 nm.

[0087] See appendix Figure 10 The figure shows the luminescence decay curve of the sample prepared according to Example 4 of this paper. Its luminescence lifetime is 0.93 milliseconds, which is Eu. 3+ The characteristic luminescence decay of ions can meet the needs of luminescent displays without exhibiting afterglow.

[0088] This disclosure proposes an Eu 3+ Ion-activated red luminescent materials, their preparation methods, and applications have the following advantages compared to existing technologies:

[0089] First, the advantage of the red luminescent material disclosed herein lies in the presence of gadolinium ions (Gd) in the crystal lattice. 3+ ), magnesium ions (Mg 2+ ) and niobium ions (Nb 5+ ) Randomly and uniformly occupying the same crystallographic lattice site, activating ions Eu3+ The crystal field can be strongly perturbed, which is beneficial for the full splitting of its 4f level, and also particularly beneficial for Eu. 3+ of 5 D0→ 7 The electric dipole transition of F2 results in pure red light emission and high luminous efficiency.

[0090] Secondly, compared with existing technical solutions, the advantages of the red luminescent material disclosed herein are: the matrix tungstate salt of the red luminescent material has strong light absorption in the near-ultraviolet and blue light ranges, and the matrix and activation center europium ions (Eu) have strong light absorption. 3+ The energy transfer efficiency between them is high.

[0091] Third, compared with common tungstate matrices such as CaWO4, the matrix lattice of the phosphor disclosed herein has not only WO6 octahedrons but also NbO6 octahedrons, which enhances the lattice strength, so that the phosphor has very good luminous efficiency and temperature stability.

[0092] Fourth, compared with traditional red luminescent powder Y2O3:Eu 3+ YVO4:Eu 3+ Compared with other methods, the phosphor preparation method provided in this disclosure is simple, pollution-free, has no waste gas or waste liquid emissions, has a low sintering temperature, saves energy, and is easy to produce.

[0093] It is understood that the above embodiments are merely exemplary embodiments used to illustrate the principles of this disclosure, and this disclosure is not limited thereto. For those skilled in the art, various modifications and improvements can be made without departing from the spirit and substance of this disclosure, and these modifications and improvements are also considered to be within the scope of protection of this disclosure.

Claims

1. A Eu 3+ ion-activated red luminescent material characterized in that, The red luminescent material has a chemical formula of Ba4GdMgNbWO 12 :xEu, wherein x Eu 3+ is replaced by Gd 3+ in a molar amount of 0.003 x ≤0.

40.

2. The Eu of claim 1 3+ Ionically activated red luminescent material, characterized in that The red light-emitting material can emit red light with a sharp characteristic peak at 613 nm under excitation of ultraviolet-blue light.

3. A process for the preparation of Eu 3+ Process for the preparation of an ion-activated red luminescent material, characterized in that, The method comprises: A compound containing barium ions, a compound containing gadolinium ions, a compound containing magnesium ions, a compound containing niobium ions, a compound containing tungsten ions, and a compound containing europium ions are weighed out in stoichiometric ratios of the respective elements in the chemical formula Ba4GdMgNbWO 12 :xEu, and the weighed-out compounds are ground and mixed uniformly to obtain an initial raw material mixture. The initial raw material mixture is pre-sintered for the first time under an air atmosphere, the sintering temperature is 300-600 DEG C, the sintering time is 1-5 hours, the sintered product is naturally cooled to room temperature, and the sintered product is fully ground to mix uniformly to obtain a first pre-sintered mixture; The first pre-sintered mixture is sintered for the second time under an air atmosphere, the sintering temperature is 800-1000 DEG C, the sintering time is 1-10 hours, and the sintered product is naturally cooled to room temperature to obtain a second pre-sintered mixture. The second pre-sintering mixture is sintered for the third time under an air atmosphere, the sintering temperature is 1000-1350°C, the sintering time is 3-10 hours, the sintered product is naturally cooled to room temperature, and a Eu 3+ ion-activated red luminescent material is obtained.

4. The method of claim 3, wherein, The compound containing barium ions is one of barium oxide, barium nitrate and barium carbonate.

5. The method of claim 3, wherein, The compound containing gadolinium ions is one of gadolinium oxide, gadolinium nitrate and gadolinium carbonate.

6. The method of claim 3, wherein, The compound containing magnesium ions is one of four water alkali magnesium carbonate, magnesium nitrate, magnesium oxide and magnesium hydroxide.

7. The method of claim 3, wherein, The compound containing niobium ions is one of diniobium pentoxide, niobium pentachloride and niobium hydroxide.

8. The method of claim 3, wherein, The compound containing tungsten ions is one of tungsten oxide and ammonium tungstate.

9. The method of claim 3, wherein, The compound containing europium ions is europium oxide.

10. A Eu as claimed in claim 1 or 2 3+ Use of ionically activated red luminescent material in white light emitting LEDs based on near-UV, blue light semiconductor chip excitation.

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