A high quantum yield tetraphenyl ethene oxonol fluorescent nanocomposite, its preparation method and application in white LED lamp

Abstract

The application relates to a preparation method of high-quantum-yield tetraphenyl ethene oxonium salt / polyoxometalate fluorescent nanomaterial and application of the nanomaterial in a white light LED lamp. 10 The self-assembly in an aqueous solution is convenient and fast, and a novel fluorescent nanomaterial with environment-friendly characteristics is prepared. The fluorescent material has good light emitting properties, and the fluorescence quantum yield is 39.88%, which is increased by 2.18 times compared with that of original TPE-1. Through mixing of a low amount of the fluorescent material and commercial fluorescent powder, a white light fluorescent powder under 365nm can be obtained, and the fluorescent powder can be used for LED lamp manufacturing.

Description

Technical Field

[0001] This invention relates to a high quantum yield tetraphenylethylene hum salt-based fluorescent nanocomposite material, its preparation method, and its application in white LED lamps, belonging to the field of new materials. Background Technology

[0002] White light-emitting diodes (WLEDs) are a new type of solid-state cold light source that directly converts electrical energy into white light. They possess advantages such as low energy consumption, long lifespan, light weight, and fast response, showing significant advantages over traditional light sources and are known as the "fourth-generation light source," with enormous application prospects in lighting and display fields. Currently, most methods for preparing WLEDs use a variety of phosphors, involving complex steps and manufacturing processes. Many methods also employ substances containing elements such as sulfur. For example, Chinese patent document CN103881704A discloses a sulfur oxide orange-yellow phosphor for white LEDs and its preparation method, which has high manufacturing costs and does not meet environmental protection requirements. Traditional fluorescent materials also exhibit aggregation-caused quenching (ACQ), limiting their application in white LED lamps. Therefore, finding a fluorescent material that is easy to manufacture, environmentally friendly and non-toxic, and exhibits aggregation-induced emission (AIE) as the phosphor powder for WLEDs is of great significance.

[0003] Currently, there are some literature reports on the preparation of WLEDs using phosphors containing elements such as sulfur. Chinese patent document CN109294564A discloses a method for preparing a WLED phosphor based on MOF functionalized carbon dots, using a mechanical mixing method to prepare a phosphor powder that emits white light under 365nm excitation. However, its limitation lies in the relatively weak fluorescence intensity. Chinese patent document CN109294576A discloses a single-ion-doped white phosphor for WLED devices and its preparation method. This is a novel single-matrix white phosphor doped with a single trivalent ion, its elemental composition including alkaline earth metals, low-valence transition metals, and high-valence transition metals. The preparation of this white phosphor requires a high temperature of 1100℃, which is not conducive to energy conservation.

[0004] Tetraphenylethylene and its derivatives, as fluorescent materials with AIE properties, have significant application value in WLED lamps. Numerous related patent documents have been reported. For example, Chinese patent document CN114956973A discloses an organic porous material based on tetraphenylethylene, its preparation method, and its application. Tetraphenylethylene derivative (TPE-1-Ph-CHO) and hydrazine hydrate are added to an organic solvent, heated and reacted in an oxygen-free environment for five days, followed by filtration and washing for one day to obtain the target product. Applying this to a blue-emitting LED device produces white light. Chinese patent document CN107188853A discloses a preparation method and application of a tetraphenylethylene-based blue light material containing benzimidazole units. After synthesizing the precursor, operations such as dissolution, reflux, and recrystallization are performed to obtain the final product. When used as the emitting layer, the device prepared with this material achieves a luminous intensity of 2470 cd / m². 2 (6.8V). Although the above has solved some existing problems of LEDs, there are still shortcomings, such as: poor fluorescence quantum yield, complicated preparation, poor economic applicability, or high difficulty in practical application.

[0005] In summary, current fluorescent powders often require complex procedures, have weak fluorescence intensity, low quantum yield, and poor economic applicability. There are few reports on the application of simple, easy-to-operate, high fluorescence intensity, high quantum yield, and self-assembled systems in WLEDs. Summary of the Invention

[0006] To address the shortcomings of existing technologies, this invention provides a high quantum yield tetraphenylethylene hummite-based fluorescent nanocomposite material, its preparation method, and its application in white LED lamps.

[0007] Terminology Explanation:

[0008] Tetraphenyl monazine, with the following molecular structure, exhibits aggregation-induced emission (AIE) and is referred to as TPE-1.

[0009]

[0010] EuW 10 : is Na9[Eu(W5O 18 The abbreviation for )2]·32H2O is a type of Weakley-type rare earth polyoxometalate that exhibits charge transfer from ligands to metals and has certain luminescent properties. Its structure is as follows.

[0011]

[0012] This invention is achieved through the following technical solution:

[0013] The first objective of this invention is to provide a high quantum yield tetraphenyl hum salt-based fluorescent nanocomposite material.

[0014] A high quantum yield tetraphenylethylene hum salt-based fluorescent nanocomposite material, wherein the fluorescent nanocomposite material is TPE-1 and EuW 10 Spherical nanoparticles formed by self-assembly.

[0015] According to a preferred embodiment of the present invention, the spherical fluorescent nanoparticles have a particle size of 35-50 nm and a quantum yield of 39-45%.

[0016] A second objective of this invention is to provide a method for preparing the above-mentioned high quantum yield tetraphenylethylene hum salt-based fluorescent nanocomposite material.

[0017] The preparation method of high quantum yield tetraphenylethylene hum salt-based fluorescent nanocomposite material includes the following steps:

[0018] TPE-1 was dispersed in ultrapure water to prepare a TPE-1 solution. EuW... 10 EuW was dispersed in ultrapure water and subjected to ultrasonic treatment to completely dissolve it, thus obtaining EuW. 10 Solution, add EuW to TPE-1 solution 10 The solution was dissolved to form a mixed solution; after standing, a fluorescent precipitate was formed. The supernatant was discarded, and the remaining solution was centrifuged, washed, and freeze-dried to obtain tetraphenylethylene hum salt-based fluorescent nanocomposite material.

[0019] According to the present invention, preferably, TPE-1 is a fluorescent powder of tetraphenyl hum salt with high symmetry, named 4,4',4',4”-(ethylene-1,1,2,2-tetraalkyltetrayl(benzene-4,1-diyl))tetrayl(1-allylpyridine-1-hum).

[0020] According to the present invention, preferably, TPE-1 is prepared by the following method:

[0021] 100 mg of tetra(4-pyridylphenyl)ethylene and 187.2 mg of 3-bromopropylene were mixed in 10 mL of DMF and heated at 100 °C for 10 h. The reaction mixture was cooled to room temperature, and the precipitate was filtered and washed with acetone to give a yellow solid.

[0022] According to the present invention, preferably, the concentration of the TPE-1 solution is 1 to 10 mM, and most preferably, the concentration of the TPE-1 solution is 5 mM.

[0023] According to the present invention, preferably, EuW 10 A solution concentration of 10–20 mM is most preferred, EuW 10 The concentration of the solution is 20 mM.

[0024] According to the present invention, preferably, EuW 10During solution preparation, the ultrasonic treatment frequency is 30-50kHz, the ultrasonic power is 70-90W, and the ultrasonic time is 10-20 minutes.

[0025] According to the present invention, preferably, the concentration of TPE-1 in the mixed solution is 0.05-1 mM, and the concentration of EuW in the mixed solution is... 10 The concentration is 0.05–10 mM.

[0026] According to the present invention, preferably, TPE-1 and EuW in the mixed solution 10 The molar ratio is 4:1 to 4:16.

[0027] According to the present invention, preferably, the centrifugation speed is 6000-8000 r / min and the centrifugation time is 10-20 minutes.

[0028] According to the present invention, preferably, the freeze-drying temperature is -60°C and the freeze-drying time is 24 hours.

[0029] According to the present invention, the fluorescent precipitate is yellow and turns orange after freeze-drying, and the quantum yield of the freeze-dried fluorescent nanopowder is 39.88%.

[0030] A third objective of this invention is to provide the application of the above-mentioned fluorescent nanocomposite material in the preparation of white LEDs.

[0031] Specifically, in the application of fluorescent nanocomposite materials in the preparation of white LEDs, the above-mentioned fluorescent nanopowder is mixed with phosphors of different colors, ground evenly, and then deposited onto the LED chip through adhesive and cured to obtain LEDs of different colors.

[0032] According to the present invention, preferably, the different colored phosphors are blue and green.

[0033] According to the present invention, preferably, the adhesive used for adhesive deposition is high-refractive-index LED chip silicone A adhesive and silicone B adhesive, and the mixing mass ratio of silicone A adhesive and silicone B adhesive is 1:4.

[0034] According to the present invention, preferably, the excitation wavelength of the LED chip is 365nm;

[0035] According to the present invention, preferably, the drying temperature of the curing treatment is 60°C and the curing time is 3 hours.

[0036] The principle of this invention:

[0037] The TPE-1 of this invention is a substance exhibiting aggregation-induced emission, EuW 10 In aqueous solution, it can undergo supramolecular self-assembly with TPE-1 through electrostatic interactions to form spherical nanoparticles, thereby inducing the aggregation of TPE-1 molecules and resulting in aggregation-induced luminescence. Simultaneously, EuW...10 The addition of TPE-1 reduces its electron-withdrawing ability, causing the electron cloud to disperse and the system energy to decrease. This results in a redshift, which in turn enhances the fluorescence intensity and significantly increases the fluorescence quantum yield.

[0038] The key features and beneficial effects of this invention are:

[0039] 1. This invention provides a novel fluorescent nanomaterial, tetraphenylethylene monazine-based fluorescent nanocomposite material, through a convenient and rapid self-assembly method. It exhibits high fluorescence quantum yield, strong fluorescence intensity, simple preparation, and strong economic applicability, greatly enhancing the possibility of practical applications.

[0040] 2. The materials used in this invention are TPE-1 and EuW. 10 Both belong to novel inorganic materials and possess unique fluorescent properties.

[0041] 3. The method used in this invention can conveniently and quickly prepare a new fluorescent nanomaterial.

[0042] 4. This invention significantly improves the fluorescence quantum yield of TPE-1, which is of great significance for its practical application.

[0043] 5. This invention does not use raw materials containing sulfur or other elements, making it environmentally friendly.

[0044] 6. It solves the problems of complicated preparation steps and pollution associated with WLED fluorescent powder, and has significant practical application value. Attached Figure Description

[0045] Figure 1 The images shown are: (a) SEM image of TPE-1 powder, (b) SEM image of TPE-1 powder after dissolution and freeze-drying, (c) SEM image of suspension, and (d) TEM image of suspension under different magnifications in Examples 1 and 2 of this invention.

[0046] Figure 2 The fluorescence lifetime diagrams are of TPE-1 (a) and the prepared fluorescent nanocomposite material (b) of the present invention.

[0047] Figure 3 The TPE-1 solution (0.2 mM) (a), TPE-1 solid (b), and EuW of the present invention are shown in the figures. 10 Fluorescence spectra of solid (c) and composite powder of Example 1 (d).

[0048] Figure 4 The infrared spectrum of the fluorescent nanocomposite material obtained in Example 2 of this invention is shown.

[0049] Figure 5 This is the ultraviolet spectrum of the fluorescent nanocomposite material obtained in Example 2 of the present invention.

[0050] Figure 6 The image shows the XRD pattern of the fluorescent nanocomposite material obtained in Example 2 of this invention.

[0051] Figure 7 This is the fluorescence spectrum of the fluorescent suspension obtained in Example 3 of the present invention.

[0052] Figure 8 This is the fluorescence spectrum of the fluorescent suspension obtained in Example 4 of the present invention.

[0053] Figure 9 The fluorescence spectrum of the fluorescent suspension obtained in Example 5 of this invention is shown.

[0054] Figure 10 The images show the fluorescence spectrum and LED photograph of the phosphor used in Example 6 of this invention.

[0055] Figure 11 The images show the fluorescence spectrum and LED photograph of the phosphor used in Example 7 of this invention.

[0056] Figure 12 The images show the fluorescence spectrum and LED photograph of the white phosphor used in Example 8 of this invention.

[0057] Figure 13 This is a CIE coordinate diagram of the phosphors used in Examples 6, 7, and 8 of the present invention. Detailed Implementation

[0058] The present invention will be further described below with reference to specific embodiments and accompanying drawings, but is not limited thereto.

[0059] All raw materials used in the examples are conventional raw materials and commercially available products.

[0060] The material characteristics in the embodiments were tested using the following methods:

[0061] 1. Transmission electron microscopy (TEM). Observation of TPE-1 / EuW using TEM. 10 Morphology of spherical nanocomposites.

[0062] 2. Scanning electron microscopy (SEM). TPE-1 / EuW was observed using SEM. 10 Morphology of spherical nanocomposites.

[0063] 3. Fluorescence spectroscopy. The fluorescence intensity of the sample is measured using a fluorescence spectrophotometer.

[0064] 4. Fourier Transform Infrared Spectroscopy (FT-IR). FT-IR spectra are used to characterize intermolecular forces.

[0065] 5. X-ray diffraction (XRD). XRD is used to characterize possible forces.

[0066] 6. Quantum yield was measured using an Edinburgh Instruments FLS920 with a xenon lamp at 450W as the light source, using the integrating sphere method, with barium sulfate powder as the reference.

[0067] Example 1

[0068] Preparation method of fluorescent powder of tetraphenylethylene humite with high symmetry:

[0069] Tetra(4-pyridylphenyl)ethylene (100 mg, 0.156 mmol) and 3-bromopropene (187.2 mg, 15.6 mmol) were mixed in DMF (10 mL) and heated at 100 °C for 10 h. The reaction mixture was cooled to room temperature, and the precipitate was filtered and washed with acetone to give a yellow solid TPE-1 (158 mg, 90%).

[0070] TPE-1 proton NMR spectrum: 1 H NMR(400MHz,D2O):8.76-8.74(d,J=8.0Hz,8H),8.25-8.23(d,J=8.0Hz,8H),7.79-7.77(d,J=8.0Hz,8 H),7.43-7.41(d,J=8.0Hz,8H),6.18-6.08(m,4H),5.54-5.43(m,8H),5.17-5.16(d,J=4.0Hz,8H).13C NMR(100MHz,D2O):155.89,146.27,144.06,141.60,132.71,132.48,130.06,127.77,124.75,122.61,62.49.

[0071] SEM images of TPE-1 prepared in this embodiment and the powder after TPE-1 was dissolved and freeze-dried are shown below. Figure 1 As shown, Figure 1 Before freeze-drying, it has a columnar structure. Figure 1 After freeze-drying, it appears as thin flakes.

[0072] Example 2

[0073] The preparation method of tetraphenylethylene monoxide / polyoxometalate fluorescent nanocomposite material is as follows:

[0074] (1) Preparation of TPE-1 aqueous solution

[0075] Accurately weigh the TPE-1 solid powder obtained in Example 1, add ultrapure water, and prepare a TPE-1 aqueous solution with a concentration of 5 mM.

[0076] (2) EuW 10 Preparation of aqueous solution

[0077] Accurately weigh EuW 10 Powder was added to ultrapure water and ultrasonically treated (80W, 40kHz) to prepare a 20mM EuW solution. 10 Aqueous solution.

[0078] (3)TPE-1 / EuW 10 Preparation of fluorescent nanocomposites

[0079] Transfer 2.00 mL of LTPE-1 solution to a 50 mL centrifuge tube, dilute with 40 mL of ultrapure water, and then add 0.50 mL of LEuW. 10 Add ultrapure water to the solution to a volume of 50.00 mL, let stand for 24 h to allow for sufficient self-assembly; discard the supernatant, centrifuge and wash the remaining suspension, retain the precipitate, and freeze-dry the obtained precipitate at -60℃ for 12 h to obtain TPE-1 / EuW. 10 Fluorescent nanocomposite materials.

[0080] The SEM and TEM images of the core sample prepared in this embodiment are as follows: Figure 1 As shown in (c) and (d), it forms an aggregated structure of uniform nanoparticles.

[0081] Experimental Example

[0082] Test TPE-1 prepared in Example 1 and TPE-1 / EuW prepared in Example 2 10 Quantum yield of fluorescent nanocomposites, TPE-1 and TPE-1 / EuW 10 The quantum yields of the fluorescent nanocomposite material reached 18.27% and 39.88%, respectively, and the quantum yield of the composite material was 2.18 times higher than that of the pure TPE-1 powder.

[0083] TPE-1(a) prepared in Example 1 and TPE-1 / EuW prepared in Example 2 10 The fluorescence lifetime spectrum of the fluorescent nanocomposite material (b) is shown in the figure. Figure 2 As shown, the fluorescence lifetime increased from 3.77 ns to 5.40 ns before and after self-assembly.

[0084] The TPE-1 obtained in Example 1 was prepared into a solution (0.2 mM), TPE-1 solid powder, and TPE-1 / EuW prepared in Example 2. 10 Suspension, TPE-1 / EuW10 The fluorescence spectra of the solid powders are as follows: Figure 3 As shown. Figure 3 b shows that the two fluorescence peaks of solid pure TPE-1 are located at 505 nm and 630 nm, respectively. Figure 3 c shows EuW 10 Eu 3+ The obvious feature is the four band transitions of 5D0→7F1 (593nm), 5D0→7F2 (615nm), 5D0→7F3 (651nm), and 5D0→7F4 (701nm). Figure 3 The data shows that the peaks of the solid powder formed after self-assembly of the two are located at 535 nm and 713 nm, which are red-shifted compared to the original peaks of TPE-1. This may be due to the addition of EuW. 10 Subsequently, due to its negative charge, the addition of this compound reduces the electron-withdrawing ability of TPE-1, leading to electron cloud dispersion, a decrease in system energy, and thus a redshift. Compared to the solid powder, the intensities of the two fluorescence peaks were enhanced by 1.22 times and 2.61 times, respectively.

[0085] TPE-1 / EuW prepared in Example 2 10 The infrared spectrum of the fluorescent nanocomposite material is as follows: Figure 4 As shown.

[0086] TPE-1 / EuW prepared in Example 2 10 The ultraviolet spectrum of the fluorescent nanocomposite material is as follows: Figure 5 As shown.

[0087] TPE-1 / EuW prepared in Example 2 10 The XRD pattern of the fluorescent nanocomposite material is as follows: Figure 6 As shown.

[0088] Example 3

[0089] The preparation method of tetraphenylethylene monoxide / polyoxometalate fluorescent nanocomposite material is as follows:

[0090] (1) Preparation of TPE-1 aqueous solution

[0091] Accurately weigh the TPE-1 solid powder obtained in Example 1, add ultrapure water, and prepare an aqueous solution of TPE-1 with a concentration of 1 mM.

[0092] (2) EuW 10 Preparation of aqueous solution

[0093] Accurately weigh EuW 10 Powder was added to ultrapure water and ultrasonically treated (80W, 40kHz) to prepare a 20mM EuW solution. 10Aqueous solution.

[0094] (3)TPE-1 / EuW 10 Preparation of fluorescent nanocomposites

[0095] Transfer 10.00 mL of LTPE-1 solution to a 50 mL centrifuge tube and dilute with 30 mL of ultrapure water. Then add 0.50 mL of LEuW. 10 Add ultrapure water to the solution to a volume of 50.00 mL. Let it stand for 24 h to allow for complete self-assembly. Discard the supernatant, centrifuge and wash the remaining suspension, and retain the precipitate. Freeze-dry the obtained precipitate at -60℃ for 12 h to obtain TPE-1 / EuW. 10 Fluorescent nanocomposite materials.

[0096] The fluorescence spectrum of the suspension obtained in this embodiment is as follows: Figure 7 As shown.

[0097] Example 4

[0098] The preparation method of tetraphenylethylene monoxide / polyoxometalate fluorescent nanocomposite material is as follows:

[0099] (1) Preparation of TPE-1 aqueous solution

[0100] Accurately weigh the TPE-1 solid powder obtained in Example 1, add ultrapure water, and prepare an aqueous solution of TPE-1 with a concentration of 1 mM.

[0101] (2) EuW 10 Preparation of aqueous solution

[0102] Accurately weigh EuW 10 Powder was added to ultrapure water and ultrasonically treated (80W, 40kHz) to prepare a 20mM EuW solution. 10 Aqueous solution.

[0103] (3)TPE-1 / EuW 10 Preparation of fluorescent nanocomposites

[0104] Transfer 10.00 mL of LTPE-1 solution to a 50 mL centrifuge tube and dilute with 30 mL of ultrapure water. Then add 1.00 mL of LEuW. 10 Add ultrapure water to the solution to a volume of 50.00 mL. Let it stand for 24 h to allow for complete self-assembly. Discard the supernatant, centrifuge and wash the remaining suspension, and retain the precipitate. Freeze-dry the obtained precipitate at -60℃ for 12 h to obtain TPE-1 / EuW. 10 Fluorescent nanocomposite materials.

[0105] The fluorescence spectrum of the suspension obtained in this embodiment is as follows: Figure 8 As shown.

[0106] Example 5

[0107] The preparation method of tetraphenylethylene monoxide / polyoxometalate fluorescent nanocomposite material is as follows:

[0108] (1) Preparation of TPE-1 aqueous solution

[0109] Accurately weigh the TPE-1 solid powder obtained in Example 1, add ultrapure water, and prepare a TPE-1 aqueous solution with a concentration of 5 mM.

[0110] (2) EuW 10 Preparation of aqueous solution

[0111] Accurately weigh EuW 10 Powder was added to ultrapure water and ultrasonically treated (80W, 40kHz) to prepare a 20mM EuW solution. 10 Aqueous solution.

[0112] (3)TPE-1 / EuW 10 Preparation of fluorescent nanocomposites

[0113] Transfer 4.00 mL of TPE-1 solution to a 50 mL centrifuge tube and dilute with 30 mL of ultrapure water. Then add 1.00 mL of LEuW. 10 Add ultrapure water to the solution to a volume of 50.00 mL. Let it stand for 24 h to allow for complete self-assembly. Discard the supernatant, centrifuge and wash the remaining suspension, and retain the precipitate. Freeze-dry the obtained precipitate at -60℃ for 12 h to obtain TPE-1 / EuW. 10 Fluorescent nanocomposite materials.

[0114] The fluorescence spectrum of the suspension obtained in this embodiment is as follows: Figure 9 As shown.

[0115] Example 6

[0116] The fabrication method of yellow-emitting LEDs includes the following steps:

[0117] Accurately weigh 5 mg of TPE-1 powder obtained in Example 1, grind it thoroughly in a mortar, then accurately weigh 5 mg and 20 mg of high-refractive LED chip silicone A and B adhesives respectively, mix them evenly at a mass ratio of 1:4, and mix the sample powder with the commercial adhesive evenly. Take a mixture of viscous liquid about the size of a bean, deposit it on a commercially available LED chip, and cure it in an oven at 60°C for 3 hours to manufacture the LED.

[0118] The LED pattern obtained in this embodiment, emitting yellow light, is shown below. Figure 10As shown. Spectral analysis indicates that the chromaticity coordinates of the fluorescence emission spectrum of the yellow LED prepared in this embodiment at an excitation wavelength of 365 nm are (0.46, 0.51).

[0119] Example 7

[0120] The method for preparing orange-emitting LEDs includes the following steps:

[0121] Accurately weigh 5 mg of TPE-1 powder obtained in Example 1, grind it thoroughly in a mortar, then accurately weigh 5 mg and 20 mg of high-refractive LED chip silicone A and B, respectively, mix them evenly at a mass ratio of 1:4, and mix the sample powder with the commercial adhesive evenly. Take a mixture of viscous liquid about the size of a bean, deposit it on a commercially available LED chip, and cure it in an oven at 60°C for 3 hours to manufacture the LED.

[0122] The LED pattern emitting orange light obtained in this embodiment is shown below. Figure 11 As shown. Spectral analysis indicates that the color coordinates of the fluorescence emission spectrum of the orange LED prepared in this embodiment at an excitation wavelength of 365 nm are (0.51, 0.47).

[0123] Example 8

[0124] The fabrication method of white-emitting LEDs includes the following steps:

[0125] Accurately weigh 2 mg of the fluorescent nanocomposite powder obtained in Example 2, mix it with 74 mg of commercial blue phosphor and 1 mg of green phosphor, and grind it thoroughly in a mortar. Then, accurately weigh 10 mg and 40 mg of high-refractive LED chip silicone A glue and B glue respectively, mix them evenly at a mass ratio of 1:4, and mix the sample powder with the commercial glue evenly. Take a mixture of viscous liquid about the size of a bean, deposit it on a commercially available LED chip, and cure it in an oven at 60°C for 3 hours to manufacture an LED.

[0126] The white-light-emitting LED obtained in this embodiment is shown in the image below. Figure 12 As shown. Spectral analysis indicates that the color coordinates of the fluorescence emission spectrum of the white LED prepared in this embodiment at an excitation wavelength of 365 nm are (0.333, 0.337).

Claims

1. A high quantum yield tetraphenylethylene hum salt-based fluorescent nanocomposite material, wherein the fluorescent nanocomposite material is TPE-1 and EuW. 10 The self-assembled spherical nanoparticles, TPE-1 molecular structure is as follows: ， EuW 10 Na9[Eu(W5O) 18 )2]·32H2O, The high quantum yield tetraphenylethylene hum salt-based fluorescent nanocomposite material was prepared by the following method: TPE-1 was dispersed in ultrapure water to prepare a TPE-1 solution. EuW... 10 EuW was dispersed in ultrapure water and subjected to ultrasonic treatment to completely dissolve it, thus obtaining EuW. 10 Solution, add EuW to TPE-1 solution 10 The solution was dissolved to form a mixed solution; after standing, a fluorescent precipitate was formed. The supernatant was discarded, and the remaining solution was centrifuged, washed, and freeze-dried to obtain tetraphenylethylene hum salt-based fluorescent nanocomposite material.

2. The high quantum yield tetraphenylethylene hummite-based fluorescent nanocomposite material according to claim 1, characterized in that, The spherical fluorescent nanoparticles have a particle size of 35-50 nm and a quantum yield of 39-45%.

3. The preparation method of the high quantum yield tetraphenylethylene hummite-based fluorescent nanocomposite material according to claim 1, comprising the following steps: TPE-1 was dispersed in ultrapure water to prepare a TPE-1 solution. EuW... 10 EuW was dispersed in ultrapure water and subjected to ultrasonic treatment to completely dissolve it, thus obtaining EuW. 10 Solution, add EuW to TPE-1 solution 10 The solution was dissolved to form a mixed solution; after standing, a fluorescent precipitate was formed. The supernatant was discarded, and the remaining solution was centrifuged, washed, and freeze-dried to obtain tetraphenylethylene hum salt-based fluorescent nanocomposite material.

4. The preparation method according to claim 3, characterized in that, TPE-1 was prepared using the following method: 100 mg of tetra(4-pyridylphenyl)ethylene and 187.2 mg of 3-bromopropylene were mixed in 10 mL of DMF and heated at 100 °C for 10 h. The reaction mixture was cooled to room temperature, and the precipitate was filtered and washed with acetone to give a yellow solid.

5. The preparation method according to claim 3, characterized in that, The concentration of TPE-1 solution is 1~10 mM.

6. The preparation method according to claim 3, characterized in that, EuW 10 The concentration of the solution is 10~20 mM.

7. The preparation method according to claim 3, characterized in that, EuW 10 During solution preparation, the ultrasonic treatment frequency was 30-50 kHz, the ultrasonic power was 70-90 W, and the ultrasonic time was 10-20 minutes. The concentration of TPE-1 in the mixed solution was 0.05-1 mM, and the EuW content in the mixed solution was [missing information]. 10 The concentration of TPE-1 in the mixed solution is 0.05~10 mM, and the concentration of TPE-1 in the mixed solution is 0.05~10 mM. 10 The molar ratio was 4:1 to 4:16, the centrifugation speed was 6000 to 8000 r / min, the centrifugation time was 10 to 20 minutes, the freeze-drying temperature was -60℃, and the freeze-drying time was 24 hours.

8. The application of the fluorescent nanocomposite material according to claim 1 in the preparation of white LEDs.

9. The application according to claim 8, characterized in that, The application of fluorescent nanocomposite materials in the preparation of white LEDs involves mixing the above-mentioned fluorescent nanopowder with phosphors of different colors, grinding them evenly, and then depositing them onto LED chips through adhesive and curing them to obtain LEDs of different colors.

10. The application according to claim 9, characterized in that, The different colors of fluorescent powder are blue and green. The adhesives used for deposition are high-refractive-index LED chip silicone A and silicone B, with a mixing mass ratio of silicone A to silicone B of 1:

4. The drying temperature for curing is 60℃, and the curing time is 3 hours.

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