CN110330512B - Silver nanocluster fluorescent nanorod, preparation method thereof and application thereof in white light LED - Google Patents
Silver nanocluster fluorescent nanorod, preparation method thereof and application thereof in white light LED Download PDFInfo
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- CN110330512B CN110330512B CN201910694647.1A CN201910694647A CN110330512B CN 110330512 B CN110330512 B CN 110330512B CN 201910694647 A CN201910694647 A CN 201910694647A CN 110330512 B CN110330512 B CN 110330512B
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- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 title claims abstract description 87
- 229910052709 silver Inorganic materials 0.000 title claims abstract description 83
- 239000004332 silver Substances 0.000 title claims abstract description 82
- 239000002073 nanorod Substances 0.000 title claims abstract description 77
- 238000002360 preparation method Methods 0.000 title claims abstract description 17
- 239000000843 powder Substances 0.000 claims abstract description 33
- 239000007864 aqueous solution Substances 0.000 claims abstract description 31
- 238000002156 mixing Methods 0.000 claims description 32
- 239000003292 glue Substances 0.000 claims description 19
- SQGYOTSLMSWVJD-UHFFFAOYSA-N silver(1+) nitrate Chemical compound [Ag+].[O-]N(=O)=O SQGYOTSLMSWVJD-UHFFFAOYSA-N 0.000 claims description 19
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- 239000002253 acid Substances 0.000 claims description 15
- 238000000034 method Methods 0.000 claims description 15
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 12
- 239000000741 silica gel Substances 0.000 claims description 12
- 229910002027 silica gel Inorganic materials 0.000 claims description 12
- 239000000243 solution Substances 0.000 claims description 12
- 239000003086 colorant Substances 0.000 claims description 10
- 230000005284 excitation Effects 0.000 claims description 10
- 239000003446 ligand Substances 0.000 claims description 10
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 claims description 8
- 238000000151 deposition Methods 0.000 claims description 8
- 238000002189 fluorescence spectrum Methods 0.000 claims description 8
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- 101710134784 Agnoprotein Proteins 0.000 claims description 2
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- 230000008021 deposition Effects 0.000 claims description 2
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- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 abstract description 34
- 239000000463 material Substances 0.000 abstract description 17
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- LMJXSOYPAOSIPZ-UHFFFAOYSA-N 4-sulfanylbenzoic acid Chemical compound OC(=O)C1=CC=C(S)C=C1 LMJXSOYPAOSIPZ-UHFFFAOYSA-N 0.000 description 3
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- 229910002699 Ag–S Inorganic materials 0.000 description 1
- KRHYYFGTRYWZRS-UHFFFAOYSA-M Fluoride anion Chemical compound [F-] KRHYYFGTRYWZRS-UHFFFAOYSA-M 0.000 description 1
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 1
- 235000005811 Viola adunca Nutrition 0.000 description 1
- 240000009038 Viola odorata Species 0.000 description 1
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- 238000010521 absorption reaction Methods 0.000 description 1
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- 229910052793 cadmium Inorganic materials 0.000 description 1
- BDOSMKKIYDKNTQ-UHFFFAOYSA-N cadmium atom Chemical compound [Cd] BDOSMKKIYDKNTQ-UHFFFAOYSA-N 0.000 description 1
- FAKRSMQSSFJEIM-RQJHMYQMSA-N captopril Chemical compound SC[C@@H](C)C(=O)N1CCC[C@H]1C(O)=O FAKRSMQSSFJEIM-RQJHMYQMSA-N 0.000 description 1
- 229960000830 captopril Drugs 0.000 description 1
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- HNDVDQJCIGZPNO-UHFFFAOYSA-N histidine Natural products OC(=O)C(N)CC1=CN=CN1 HNDVDQJCIGZPNO-UHFFFAOYSA-N 0.000 description 1
- 229910010272 inorganic material Inorganic materials 0.000 description 1
- 239000011147 inorganic material Substances 0.000 description 1
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- 231100000053 low toxicity Toxicity 0.000 description 1
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- QSHDDOUJBYECFT-UHFFFAOYSA-N mercury Chemical compound [Hg] QSHDDOUJBYECFT-UHFFFAOYSA-N 0.000 description 1
- 229910052753 mercury Inorganic materials 0.000 description 1
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- 239000002086 nanomaterial Substances 0.000 description 1
- 239000002135 nanosheet Substances 0.000 description 1
- 229910000510 noble metal Inorganic materials 0.000 description 1
- 229910052761 rare earth metal Inorganic materials 0.000 description 1
- 150000002910 rare earth metals Chemical class 0.000 description 1
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Abstract
The invention relates to a silver nanocluster fluorescent nanorod, a preparation method thereof and application thereof in a white light LED (light-emitting diode), wherein the fluorescent nanorod is made of Ag9Self-assembled with hydrochloric acid in aqueous solution. Ag prepared by the invention9The fluorescent nanorod has outstanding optical property, the excellent fluorescence property is still kept after the fluorescent nanorod is freeze-dried into powder, the LED emitting orange-red light and good in stability can be manufactured, and meanwhile, the fluorescent nanorod is mixed with commercial blue and green fluorescent powder according to the mass ratio of 10:5:1 to prepare the LED emitting white light. The luminous silver clusters can successfully replace the light conversion material of the traditional material, and provide possibility for preparing environment-friendly LEDs. The preparation method of the silver nanocluster fluorescent nanorod is simple and low in cost; the prepared LED has excellent luminous intensity and meets the requirement of environmental protection.
Description
Technical Field
The invention relates to a preparation method of a silver nanocluster fluorescent nanorod and application of the silver nanocluster fluorescent nanorod in a white light LED, and belongs to the field of new materials.
Background
Light is vital to human learning and life, and it is statistical that more than 20% of the electricity is used for illumination every year around the world, and therefore how to save energy and improve illumination efficiency is particularly critical in the field of illumination. Solid state lighting in the form of Light Emitting Diodes (LEDs) has excellent properties such as fast response time, high luminous efficiency, wide temperature controllable range, etc., compared to conventional fluorescent and incandescent lamps, and thus, has been increasingly researched and paid attention to. To date, commercial LEDs are typically fabricated by coating a color conversion material on a blue-violet emitting InGaN/GaN chip. The color conversion material may fully or partially convert the chip emission to a desired luminescent color, thereby producing an LED with visible color or white light. The rare earth fluorescent powder is used as a candidate of a light conversion material, and has the defects of shortage of supply resources, high recycling difficulty and environmental pollution; common organic fluorophores are not resistant to photobleaching, and are limited in application to the field of LEDs; quantum dots are also considered competitive color conversion materials, but most LEDs manufactured with respect to quantum dots rely on the use of quantum dots containing heavy metal cations (e.g., cadmium, lead, mercury, etc.), which can have a serious impact on human health. Therefore, in order to continue to advance to environment-friendly LEDs, there is an urgent need to find light conversion materials that can replace heavy metals and meet safety regulations.
Recently, metal nanoclusters are used as environmentally friendly and biocompatible color conversion materials in LEDs due to their low toxicity, low cost and good biocompatibility. As a new luminescent nanomaterial, the metal nanoclusters are generally composed of several to one hundred atoms, and have a size of about a fermi wavelength (<2nm) of electrons, and emission of strong fluorescence can be achieved by realizing charge transfer from a peripheral ligand of the metal nanocluster to a metal or metal-metal interaction, and their excellent luminescent properties make the metal nanoclusters useful as an LED light conversion material.
Silver nanoclusters are widely studied due to their excellent properties and easy availability of raw materials, and there are many reports on patent documents for silver nanoclusters, such as: chinese patent document CN108372312A (application number: CN201810244736.1) discloses a preparation method of a strong fluorescence emission silver nanocluster, which is characterized in that: the fluorescent silver nanocluster is a fluorescent silver nanocluster solution prepared by taking histidine as a protective agent and a reducing agent and a silver nitrate solution as a matrix through a one-pot method at room temperature. For another example: chinese patent document CN107225255A (application number: CN201710400091.1) discloses a method for preparing fluorescent silver nanoclusters, which is characterized in that the red fluorescent silver nanoclusters are prepared by a one-pot method in an alkaline environment by using captopril as a protective agent and sodium borohydride as a reducing agent. Chinese patent document CN109111912A discloses a nano-cluster core-shell fluorescent powder for a high-power white light LED and a preparation method thereof, the nano-silver cluster modified core-shell fluorescent conversion material is prepared by a hydrothermal method, Bi/Mn dual-ion doping can regulate and control the fluorescent powder to realize dual absorption in ultraviolet and blue light regions by adjusting doping coefficient, doping proportion, ionic valence state and the like, and high-intensity emission in blue light, green light, yellow light and red light regions is generated at the same time. However, the above materials mainly have the following disadvantages: 1. contains a plurality of metal elements and is fluoride, which causes resource waste and environmental damage; 2. the preparation method is complicated, a hydrothermal method is used, and the production cost is increased.
At present, reports on silver nanoclusters are only limited to the exploration of a synthesis method and the research on solid properties, and few reports are made on the regulation of the aggregate morphology of the silver nanoclusters in an aqueous solution and the application research of the silver nanoclusters as a light conversion material in the field of LEDs.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a silver nanocluster fluorescent nanorod, a preparation method thereof and application thereof in a white light LED.
Description of terms:
Ag9: is a nine-core silver nanocluster, Ag due to pi-pi interaction between ligands, charge transfer from ligands to metal-metal, and metal-metal interaction9Has certain luminescent property.
The technical scheme of the invention is as follows:
a silver nanocluster fluorescent nanorod is formed by using protonic acid to perform pairing on Ag9Protonating the solution to obtain;
the protonic acid is HCl or HBr; the Ag is9The silver nanocluster is a nine-core silver nanocluster taking Ag as a core and 4-mercaptobenzoic acid as a ligand.
According to the invention, preferably, the diameter of the silver nanocluster fluorescent nanorod is 20-30nm, and the length is 300-400 nm.
According to the invention, the fluorescence spectrum of the silver nanocluster fluorescence nanorod preferably shows that the excitation wavelength is 300-520 nm and the emission wavelength is 550-800 nm.
According to the present invention, preferably, the quantum yield of the silver nanocluster fluorescent nanorods is 5-6%.
According to the invention, the preparation method of the silver nanocluster fluorescent nanorod comprises the following steps:
mixing silver nitrate (AgNO)3) And 4-mercaptobenzoic acid (H)2mba) is dispersed in water and is subjected to ultrasonic treatment, and ammonia (NH) is added to the mixture during the ultrasonic treatment3·H2O) to obtain yellow transparent Ag9A solution; mixing Ag with water9And mixing the aqueous solution with protonic acid, and carrying out vortex and standing to obtain the silver nanocluster fluorescent nanorod aqueous solution.
According to the invention, preferably, AgNO3The concentration of the aqueous solution dispersed in water was 1 mmol.L-1,H2Concentration of aqueous solution of mba dispersed in water 1mmol · L-1；AgNO3And H2The molar ratio of mba is 1: 1;
preferably, the ultrasonic frequency of ultrasonic treatment is 30-50 kHz, the ultrasonic power is 80W, and the ultrasonic time is 20-30 minutes.
According to the invention, the mass concentration of the ammonia water is preferably 25%; the amount of ammonia added was such that the precipitate was completely dissolved. The resulting solution was a yellow clear solution.
According to the invention, preferably, Ag9The mixing ratio of the aqueous solution and the protonic acid is that the molar concentration of the protonic acid aqueous solution after mixing is 28-32 mmol.L-1，Ag9The molar concentration of the aqueous solution is 7-9 mmol.L-1And (6) counting. Preferably, the protonic acid solution can be used at a molar concentration of 12mol · L-1And (5) preparing concentrated acid. The protonic acid is HCl or HBr.
According to the invention, preferably, the vortex time is 20-30 s, and the standing time is 1-7 days.
According to the invention, the silver nanocluster fluorescent nanorod aqueous solution is freeze-dried to obtain powder.
According to the invention, the silver nanocluster fluorescent nanorod is applied to the preparation of a white light LED. The silver nanocluster fluorescent nanorod is mixed with fluorescent powder with different colors, and LEDs with different colors can be obtained.
According to the present invention, preferably, the white light LED is prepared as follows:
and (3) freeze-drying the silver nanocluster fluorescent nanorod aqueous solution into powder, uniformly grinding, uniformly mixing with fluorescent powder with different colors, depositing on an LED chip through glue, and curing to obtain the LEDs with different colors.
According to the present invention, it is preferable that the lyophilization temperature is-60 ℃ and the lyophilization time is 24 hours. The quantum yield of the fluorescent powder of the obtained fluorescent nano rod is 5-6%.
According to the present invention, preferably, the phosphors with different colors may be orange red, blue or/and green, with a mass of 10mg, 5mg and 2mg, respectively.
According to the invention, the glue used for glue deposition is preferably high-refraction LED patch silica gel A glue and B glue, and the mixing mass ratio of the glue A glue to the glue B glue is 1: 4.
According to the invention, preferably, the excitation wavelength of the LED chip is 365nm, and the luminous efficiency is 0.9 lm/W;
preferably, the drying temperature of the curing treatment is 60 ℃, and the curing time is 3 hours.
The principle of the invention is as follows:
ag prepared by the invention9The aqueous solution is non-fluorescent at room temperature, and Ag is prepared by adding protonic acid such as hydrochloric acid9The carboxylic acid radical of the peripheral ligand is protonated, the rotation and vibration of the ligand are well limited through the hydrogen bond action and the pi-pi action, the electron transfer action from the ligand to the metal is realized, and the silver nanocluster nanorod shows obvious fluorescence. Will strongly fluoresce Ag9The nanorod aqueous solution is freeze-dried into powder and is mixed with commercial fluorescent powder according to a certain proportion, and white light, namely LED lamps with different colors, can be prepared.
The invention has the outstanding characteristics and beneficial effects that:
1. ag in the invention9Is a noble metal cluster compound with the size less than 2nm, belongs to a novel inorganic material, and has novel structure and unique property; the method of supermolecule self-assembly is utilized to construct the nanorods with ordered structures, thereby realizing the emission of fluorescence, and simultaneously, the fluorescent nanorods retain the fluorescence property in a solid state.
2. The fluorescence-emitting Ag prepared by the invention9The concentration of the hydrochloric acid in the aqueous solution and the aggregation morphology can be adjusted to realize the regulation and control of the morphology.
3. The fluorescent rod of the invention has strong fluorescence characteristic and is applied to Ag9The assembly was used as a color conversion layer on a 365nm LED chip demonstrating a white light LED (wled) prototype. The fluorescent rod can realize fluorescence luminescence in aqueous solution, and fills the blank that the existing fluorescent material cannot perform fluorescence luminescence in aqueous solution.
4. The silver nanocluster fluorescent nanorod can successfully replace a light conversion material of a traditional material, and an environment-friendly LED can be prepared.
5. The preparation method of the silver nanocluster fluorescent nanorod is simple and low in cost; the prepared LED has excellent luminous intensity and meets the requirement of environmental protection.
The material characteristics described in the present invention were tested in the following way:
1. transmission Electron Microscopy (TEM). The morphology of the fluorescent nanorods can be observed by TEM.
2. Fluorescence spectroscopy. The fluorescence intensity of the fluorescent nanorods was measured by a fluorescence spectrophotometer.
3. X-ray diffraction (XRD). Nanorod forces can be characterized by XRD.
4. Fourier transform Infrared Spectroscopy (FT-IR). The protonated Ag can be characterized by FT-IR spectroscopy9And (4) interaction.
Drawings
FIG. 1 shows Ag as a synthesized substance in example 1 of the present invention9A molecular structure model diagram of (1).
Fig. 2 is a TEM image of a silver nanocluster phosphor rod according to the present invention. Wherein: (a) example 1, (b) is example 2, (c) is example 3, and (d) is example 4.
Fig. 3 is an infrared spectrum of silver nanocluster fluorescent nanorods prepared in embodiment 2 of the present invention, wherein: (a) is a fluorescent nanorod, and (b) is Ag9。
Fig. 4 is an XRD pattern of the silver nanocluster fluorescent nanorod prepared in example 2 of the present invention, wherein: (a) is a fluorescent nanorod, and (b) is Ag9。
Fig. 5 is a fluorescence spectrum of the prepared silver nanocluster fluorescent nanorods of example 1 of the present invention.
FIG. 6 is an optical photograph of samples of different colors of light obtained in examples 5 to 7 of the present invention under irradiation of an ultraviolet lamp having a wavelength of 365 nm. Wherein: (a) example 5 is used, (b) is example 6, and (c) is example 7.
FIG. 7 is an optical diagram of different color LEDs prepared in examples 5-8 of the present invention under 365nm excitation. Wherein: example 5 (a), (b) is example 6, (c) is example 7, and (d) is example 8.
FIG. 8 is a graph showing fluorescence spectra of LEDs emitting different colors prepared in examples 5-8 of the present invention. Wherein: (a) example 5 is given as (b) example 6, (c) example 7 and (d) example 8.
FIG. 9 is a CIE color chart of different color lights produced by examples 5-8 of the present invention. Wherein: orange-red for example 5, blue for example 6, green for example 7, and white for example 8.
Fig. 10 is TEM images of different morphologies of silver nanoclusters prepared according to comparative examples 1-2 of the present invention. Wherein: (a) comparative example 1, (b) comparative example 2.
Detailed Description
The invention is further illustrated, but not limited, by the following examples and the accompanying drawings.
The raw materials used in the examples are conventional raw materials, commercially available products, wherein: AgNO3Purchased from Kemiou Chemicals, Inc., Tianjin, H2mba was purchased from sigma aldrich, and concentrated hydrochloric acid, green and blue phosphors were purchased from saibo chemical agents ltd.
Example 1
A preparation method of a silver nanocluster fluorescent nanorod comprises the following steps:
(1)Ag9synthesis of molecules
Accurately weighing AgNO3(1mmol, 170mg) and H2mba (1mmol, 155mg) was dispersed in 6mL of water and sonicated in a KQ5200DE apparatus for 20 minutes (80W,40kHz) during which NH was added to the above mixture3·H2O (25%, 0.5mL) to give yellow transparent Ag9And (3) solution.
(2) Preparation of aqueous hydrochloric acid solution
Accurately transferring concentrated hydrochloric acid liquid, adding tertiary water, measuring by using a pH tester, and preparing hydrochloric acid aqueous solution with pH being 1;
(3) preparation of silver nanocluster fluorescent rod
50 mu L of Ag is measured9Adding 670 μ L of tertiary water into the water solution, adding 280 μ L of hydrochloric acid with pH of 1, vortexing for 30s to mix uniformly, adjusting the concentration of hydrochloric acid to 28mmol/L, and standing in a thermostat at 20 deg.C for 24h to obtain the final product.
Ag obtained in this example9The molecular structure of (A) is shown in FIG. 1. From FIG. 1, Ag is shown9The silver nanocluster is a nine-core silver nanocluster taking Ag as a core and 4-mercaptobenzoic acid as a ligand.
This example gave a TEM image of the silver nanocluster fluorescent nanorods as shown in fig. 2 (a). As can be seen from fig. 2(a), the silver nanocluster fluorescent nanorods exhibit an ordered and regular structure. The diameter of the nano rod is 20-30nm, and the length is 300-400 nm.
The infrared spectrum of the silver nanocluster fluorescent nanorod prepared in the embodiment is shown in fig. 3, wherein: (a) is a fluorescent nanorod, and (b) is Ag9. As can be seen from FIG. 3, the formation of nanorods is mainly driven by hydrogen bonding.
The XRD pattern of the silver nanocluster fluorescent nanorod prepared in this example is shown in fig. 4, in which: (a) is a fluorescent nanorod, and (b) is Ag9. As can be seen from FIG. 4, the nanorods have an ordered structure and the action of Ag-Ag, Ag-S and π - π.
The fluorescence spectrum of the silver nanocluster fluorescence nanorod prepared in the embodiment is shown in fig. 5, and as can be seen from fig. 5, the silver nanocluster fluorescence nanorod has a wider excitation range, an optimal excitation is 500nm, an optimal emission is 615nm, and a larger Stokes shift (100 nm) is provided.
Example 2
As described in embodiment 1, a method for preparing a silver nanocluster fluorescent nanorod includes the steps of:
50 mu L of Ag is measured9Adding 650 mu L of tertiary water into the aqueous solution, adding 300 mu L of hydrochloric acid with the pH value of 1, uniformly mixing by swirling for 30s, mixing, keeping the concentration of the hydrochloric acid at 30mmol/L, and standing for 24h in a constant temperature cabinet at 20 ℃ to obtain the compound.
Ag obtained in this example9The molecular structure of (A) is shown in FIG. 1. From FIG. 1, Ag is shown9Is a nine-core silver nanocluster.
This example gave a TEM image of the silver nanocluster fluorescent nanorods as shown in fig. 2 (b). The silver nanocluster fluorescent nanorod has an ordered and regular structure. The diameter of the nano rod is 20-30nm, and the length is 300-400 nm.
Example 3
As described in embodiment 1, a method for preparing a silver nanocluster fluorescent nanorod includes the steps of:
50 mu L of Ag is measured9Adding 630 μ L of tertiary water into the aqueous solution, adding 320 μ L of hydrochloric acid with pH value of 1, swirling for 30s to mix uniformly, mixing, adjusting the concentration of hydrochloric acid to 32mmol/L, and standing in a thermostat at 20 ℃ for 24h to obtain the final product.
Ag obtained in this example9The molecular structure of (A) is shown in FIG. 1. From FIG. 1, Ag is shown9Is a nine-core silver nanocluster.
This example gave a TEM image of the silver nanocluster fluorescent nanorods as shown in fig. 2 (c). The silver nanocluster fluorescent nanorod has an ordered and regular structure. The diameter of the nano rod is 20-30nm, and the length is 300-400 nm.
Example 4
As described in embodiment 1, a method for preparing a silver nanocluster fluorescent nanorod includes the steps of:
50 mu L of Ag is measured9Adding 630 mu L of tertiary water into the aqueous solution, adding 300 mu L of HBr with the pH value of 1, uniformly mixing by swirling for 30s, keeping the HBr concentration at 30mmol/L after mixing, and standing for 24h in a constant temperature cabinet at 20 ℃ to obtain the catalyst.
Ag obtained in this example9The molecular structure of (A) is shown in FIG. 1. From FIG. 1, Ag is shown9Is a nine-core silver nanocluster.
This example gave a TEM image of the silver nanocluster fluorescent nanorods as shown in fig. 2 (d). The silver nanocluster fluorescent nanorod has an ordered and regular structure. The diameter of the nano rod is 20-30nm, and the length is 300-400 nm.
Example 5
A preparation method of an LED emitting orange-red light comprises the following steps:
freeze-drying fluorescent nanorods into powder, accurately weighing 5mg of nanorod powder, fully grinding the powder by using a mortar, then accurately weighing 5mg and 20mg of high-refraction LED surface mount gel A and B respectively, uniformly mixing the high-refraction LED surface mount gel A and the high-refraction LED surface mount gel B according to the mass ratio of 1:4, uniformly mixing the sample powder and commercial glue, taking mixed mucus with the size of about bean grains, depositing the mixed mucus on a commercially available LED chip, and curing the mixed mucus in an oven at 60 ℃ for 3 hours to manufacture an LED.
The pattern of the orange-red light-emitting LED obtained in this example is shown in FIG. 7 (a). Spectral analysis showed that the fluorescent emission spectrum of the orange-red LED prepared in this example at an excitation wavelength of 365nm had color coordinates (0.59, 0.41).
Example 6
A method for preparing a blue light emitting LED comprises the following steps:
accurately weighing 5mg of commercial blue fluorescent powder, fully grinding the commercial blue fluorescent powder by using a mortar, then accurately weighing 5mg and 20mg of high-refraction LED patch silica gel A and B respectively, uniformly mixing the high-refraction LED patch silica gel A and the high-refraction LED patch silica gel B according to a mass ratio of 1:4, mixing sample powder with the commercial silica gel, taking mixed mucilage with the size of about bean grains, depositing the mixed mucilage on a commercially available LED chip, and curing the mixture in an oven at 60 ℃ for 3 hours to manufacture the LED.
Fig. 7(b) shows a diagram of a blue-emitting LED obtained in this example. Spectral analysis showed that the fluorescence emission spectrum of the blue LED prepared in this example at an excitation wavelength of 365nm had color coordinates (0.14, 0.06).
Example 7
A method for preparing an LED emitting green light comprises the following steps:
accurately weighing 5mg of commercial green fluorescent powder, fully grinding the commercial green fluorescent powder by using a mortar, then accurately weighing 5mg and 20mg of high-refraction LED patch silica gel A and B respectively, uniformly mixing the high-refraction LED patch silica gel A and the high-refraction LED patch silica gel B according to the mass ratio of 1:4, mixing sample powder with the commercial silica gel, taking mixed mucilage with the size of about bean grains, depositing the mixed mucilage on a commercially available LED chip, and curing the mixture in an oven at 60 ℃ for 3 hours to manufacture the LED.
Fig. 7(c) shows a green-emitting LED pattern obtained in this example. Spectral analysis showed that the fluorescence emission spectrum of the green LED prepared in this example has color coordinates (0.03,0.64) at an excitation wavelength of 365 nm.
Example 8
A method for preparing an LED emitting white light comprises the following steps:
the mass of the fluorescent nanorod, the mass of the blue fluorescent powder and the mass of the green fluorescent powder are respectively and accurately weighed to be 20mg, 10mg and 2 mg. Three kinds of fluorescent powder (fluorescent nanorods, blue fluorescent powder and green fluorescent powder) are mixed according to the mass ratio of 10:5:1, fully grinding the three fluorescent powders by using a mortar, uniformly mixing, and accurately weighing 5mg of mixed powder. And accurately weighing 5mg and 20mg of the high-refraction LED patch silica gel A glue and the high-refraction LED patch silica gel B glue, uniformly mixing the glue and the sample powder according to a mass ratio of 1:4, uniformly mixing the sample powder and the commercial glue, taking mixed mucilage with the size of about bean grains, depositing the mucilage on a commercially available LED chip, and curing the mucilage in an oven at 60 ℃ for 3 hours to manufacture the LED.
The white light-emitting LED obtained in this example is shown in fig. 7 (d). The spectral analysis showed that the fluorescence emission spectrum of the white light LED prepared in this example has color coordinates (0.33,0.32) at an excitation wavelength of 365 nm.
Comparative example 1
50 μ L of Ag was measured as described in example 19Adding 700. mu.L of tertiary water to the aqueous solution, adding 250. mu.L of hydrochloric acid having pH of 1, and mixing by vortexing for 30sMixing uniformly, mixing, keeping the hydrochloric acid concentration at 25mmol/L, and standing in a thermostat at 20 ℃ for 24h to obtain the final product.
This comparative example gave a TEM image of the product, as shown in FIG. 10 (a). As can be seen from fig. 10(a), the product is silver nanocluster nanospheres, which exhibit an ordered and regular structure, and the diameter of the nanospheres is 10-20 nm. It can be seen that silver nanorods, but nanospheres, are not obtained due to the too low concentration of hydrochloric acid after mixing.
Comparative example 2
50 μ L of Ag was measured as described in example 19Adding 650 mu L of tertiary water into the aqueous solution, adding 300 mu L of HI with pH value of 1, uniformly mixing by swirling for 30s, mixing until the concentration of HI is 30mmol/L, and standing for 24h in a constant temperature cabinet at 20 ℃ to obtain the final product.
This comparative example gave a TEM image of the product, as shown in FIG. 10 (b). As can be seen from fig. 10(b), the product is silver nanocluster nanospheres, which exhibit an ordered and regular structure, with nanosphere diameter of 30-60 nm. The silver nanocluster nanospheres do not have fluorescent light emitting characteristics. As can be seen, the use of HI resulted in no silver nanorods but nanospheres. Indicating that not all protonic acids can successfully obtain the silver nanorods.
Comparative example 3
At present, the silver nanoclusters can realize the emission of fluorescence through modification (means such as ligand modification and self-assembly). Chinese patent document CN104588645A (application number: CN201510059292.0) discloses a silver nanocluster aqueous solution with different numbers of silver cores, which has no luminescence property and is applied to antibacterial experiments; chinese patent document CN108817417A (application number: CN201810867437.3) discloses a non-luminescent spherical silver nano-sheet cluster, the solid powder of which has no luminescent property.
Although the embodiments of the present invention have been described with reference to the accompanying drawings, the scope of the present invention is not limited thereto, and various modifications and variations which do not require inventive efforts and which are made by those skilled in the art are within the scope of the present invention.
Claims (14)
1. Silver for white light LEDThe nanometer cluster fluorescent nanometer rod is characterized in that the nanometer rod is Ag by protonic acid9Protonating the solution to obtain;
the protonic acid is HCl or HBr; the Ag is9The silver nanocluster is a nine-core silver nanocluster taking Ag as a core and 2-mercaptobenzoic acid as a ligand;
Ag9the mixing ratio of the aqueous solution and the protonic acid is that the molar concentration of the protonic acid aqueous solution after mixing is 28-32 mmol.L-1，Ag9The molar concentration of the aqueous solution is 7-9 mmol.L-1And (6) counting.
2. The silver nanocluster fluorescent nanorod according to claim 1, wherein the silver nanocluster fluorescent nanorod has a diameter of 20-30nm and a length of 300-400 nm.
3. The silver nanocluster fluorescent nanorod according to claim 1, wherein the fluorescence spectrum of the silver nanocluster fluorescent nanorod shows that the excitation wavelength is 300-520 nm and the emission wavelength is 550-800 nm.
4. The silver nanocluster fluorescent nanorod according to claim 1, wherein the quantum yield of the silver nanocluster fluorescent nanorod is 5-6%.
5. The method for preparing a silver nanocluster fluorescent nanorod according to claim 1, comprising the steps of:
silver nitrate AgNO3And 2-mercaptobenzoic acid are dispersed in water and subjected to ultrasonic treatment, and ammonia NH is added into the mixture during the ultrasonic treatment3·H2O, obtaining yellow transparent Ag9A solution; mixing Ag with water9And mixing the aqueous solution with protonic acid, and carrying out vortex and standing to obtain the silver nanocluster fluorescent nanorod aqueous solution.
6. The method of claim 5, wherein AgNO is added to the mixture3Dispersed in waterThe concentration of the aqueous solution was 1 mmol. L-1Concentration of aqueous solution of 2-mercaptobenzoic acid dispersed in water is 1 mmol.L-1；AgNO3And 2-mercaptobenzoic acid in a molar ratio of 1: 1.
7. the method for preparing silver nanocluster fluorescent nanorods according to claim 5, wherein the ultrasonic frequency of the ultrasonic treatment is 30-50 kHz, the ultrasonic power is 80W, and the ultrasonic time is 20-30 minutes.
8. The method for preparing a silver nanocluster fluorescent nanorod according to claim 5, wherein the mass concentration of ammonia water is 25%; the amount of ammonia added was such that the precipitate was completely dissolved.
9. The method for preparing silver nanocluster fluorescent nanorods according to claim 5, wherein the vortex time is 20-30 s and the standing time is 1-7 days.
10. Use of the silver nanocluster fluorescent nanorods according to claim 1 in the preparation of white LEDs.
11. The use according to claim 10, wherein the white LED is prepared by:
and (3) freeze-drying the silver nanocluster fluorescent nanorod aqueous solution into powder, uniformly grinding, uniformly mixing with fluorescent powder with different colors, depositing on an LED chip through glue, and curing to obtain the LEDs with different colors.
12. Use according to claim 11, wherein the lyophilization temperature is-60 ℃ and the lyophilization time is 24 hours.
13. The use of claim 11, wherein the different color phosphors are orange red, blue
Or/and green, with a mass of 10mg, 5mg and 2mg, respectively.
14. The use of claim 11, wherein the glue used for glue deposition is high refractive LED patch silica gel a glue and B glue in a mixing mass ratio of 1: 4.
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| CN111739998A (en) * | 2020-07-03 | 2020-10-02 | 青岛科技大学 | High-color-rendering white light LED based on silver clusters and preparation method thereof |
| CN111739997A (en) * | 2020-07-03 | 2020-10-02 | 青岛科技大学 | White light LED (light emitting diode) capable of emitting light by exciting gold-silver alloy clusters through blue light and preparation method thereof |
| CN114032089B (en) * | 2021-11-25 | 2022-06-28 | 山东大学 | Silver nanocluster fluorescent nanotube, preparation method thereof and application thereof in arginine detection |
| CN114525125A (en) * | 2022-02-15 | 2022-05-24 | 山东大学 | Water-soluble 'atom accurate' Ag6Nanocluster and macro synthesis method and application thereof |
| CN116254105B (en) * | 2023-02-27 | 2024-07-23 | 山东大学 | Near infrared emission silver nanocluster/polymer composite material with photo-thermal conversion performance and preparation method thereof |
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