CN113755167A - Lead organic complex coated all-inorganic lead halogen perovskite nanocrystalline fluorescent powder and preparation method and application thereof - Google Patents
Lead organic complex coated all-inorganic lead halogen perovskite nanocrystalline fluorescent powder and preparation method and application thereof Download PDFInfo
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- QBYIENPQHBMVBV-HFEGYEGKSA-N (2R)-2-hydroxy-2-phenylacetic acid Chemical compound O[C@@H](C(O)=O)c1ccccc1.O[C@@H](C(O)=O)c1ccccc1 QBYIENPQHBMVBV-HFEGYEGKSA-N 0.000 claims abstract description 15
- 238000000034 method Methods 0.000 claims abstract description 13
- QGLWBTPVKHMVHM-KTKRTIGZSA-N (z)-octadec-9-en-1-amine Chemical compound CCCCCCCC\C=C/CCCCCCCCN QGLWBTPVKHMVHM-KTKRTIGZSA-N 0.000 claims abstract description 12
- CCCMONHAUSKTEQ-UHFFFAOYSA-N octadecene Natural products CCCCCCCCCCCCCCCCC=C CCCMONHAUSKTEQ-UHFFFAOYSA-N 0.000 claims abstract description 12
- 229910052792 caesium Inorganic materials 0.000 claims abstract description 6
- -1 cesium ions Chemical class 0.000 claims abstract description 5
- 150000004820 halides Chemical class 0.000 claims abstract description 4
- 239000012298 atmosphere Substances 0.000 claims abstract description 3
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 claims description 25
- 238000006243 chemical reaction Methods 0.000 claims description 6
- IWYDHOAUDWTVEP-SSDOTTSWSA-N (R)-mandelic acid Chemical compound OC(=O)[C@H](O)C1=CC=CC=C1 IWYDHOAUDWTVEP-SSDOTTSWSA-N 0.000 claims description 3
- IWYDHOAUDWTVEP-ZETCQYMHSA-N (S)-mandelic acid Chemical compound OC(=O)[C@@H](O)C1=CC=CC=C1 IWYDHOAUDWTVEP-ZETCQYMHSA-N 0.000 claims description 3
- ZASWJUOMEGBQCQ-UHFFFAOYSA-L dibromolead Chemical compound Br[Pb]Br ZASWJUOMEGBQCQ-UHFFFAOYSA-L 0.000 claims description 2
- HWSZZLVAJGOAAY-UHFFFAOYSA-L lead(II) chloride Chemical compound Cl[Pb]Cl HWSZZLVAJGOAAY-UHFFFAOYSA-L 0.000 claims description 2
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- 230000015572 biosynthetic process Effects 0.000 description 4
- NCMHKCKGHRPLCM-UHFFFAOYSA-N caesium(1+) Chemical compound [Cs+] NCMHKCKGHRPLCM-UHFFFAOYSA-N 0.000 description 4
- 230000000052 comparative effect Effects 0.000 description 4
- GYNNXHKOJHMOHS-UHFFFAOYSA-N methyl-cycloheptane Natural products CC1CCCCCC1 GYNNXHKOJHMOHS-UHFFFAOYSA-N 0.000 description 4
- VLKZOEOYAKHREP-UHFFFAOYSA-N n-Hexane Chemical compound CCCCCC VLKZOEOYAKHREP-UHFFFAOYSA-N 0.000 description 4
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- WYTZZXDRDKSJID-UHFFFAOYSA-N (3-aminopropyl)triethoxysilane Chemical compound CCO[Si](OCC)(OCC)CCCN WYTZZXDRDKSJID-UHFFFAOYSA-N 0.000 description 1
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- TVFDJXOCXUVLDH-UHFFFAOYSA-N caesium atom Chemical compound [Cs] TVFDJXOCXUVLDH-UHFFFAOYSA-N 0.000 description 1
- 238000012512 characterization method Methods 0.000 description 1
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- 239000002131 composite material Substances 0.000 description 1
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- C09K11/00—Luminescent, e.g. electroluminescent, chemiluminescent materials
- C09K11/08—Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials
- C09K11/66—Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials containing germanium, tin or lead
- C09K11/664—Halogenides
- C09K11/665—Halogenides with alkali or alkaline earth metals
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
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- C09K11/02—Use of particular materials as binders, particle coatings or suspension media therefor
- C09K11/025—Use of particular materials as binders, particle coatings or suspension media therefor non-luminescent particle coatings or suspension media
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Abstract
The invention discloses a preparation method of lead organic complex coated all-inorganic lead halogen perovskite nano crystal fluorescent powder, which comprises the following steps: s1, adding metal halide PbX2Adding mandelic acid and oleylamine into the octadecene solution, and stirring for 0.5-5 h at the temperature of 60-160 ℃ to obtain a solution of a Pb-mandelic acid organic complex; s2, adding an oleic acid solution of cesium carbonate into a solution of a Pb-mandelic acid organic complex, reacting for 3 s-30 min at 80-180 ℃ in an inert atmosphere, and performing post-treatment to obtain inorganic lead halide perovskite nanocrystalline fluorescent powder coated by a lead organic complex; metal halide PbX2The molar ratio to mandelic acid was 1: (0.5 to 5); implanting cesium ions with metal halide PbX2The molar ratio of (0.5-2): 1. the fluorescent powder has good fluorescence performance, can be stably stored in an air environment, has fluorescence quantum efficiency of about 48 percent, and emits lightThe peak position of the emission is 519nm, the half-peak width is about 17nm, and the method has wide application prospect.
Description
Technical Field
The invention relates to the technical field of synthesis of photoelectric materials and nano materials, in particular to lead organic complex coated all-inorganic lead halogen perovskite nano crystal fluorescent powder and a preparation method and application thereof.
Background
Due to the advantages of high fluorescence quantum yield, narrow fluorescence emission, wide color gamut and the like, the all-inorganic lead-containing perovskite nano-crystal causes extensive research of researchers, but the existing all-inorganic lead-containing perovskite nano-crystal has the problem of poor stability and limits the wide application of the nano-crystal.
The Chinese invention patent CN110872510A discloses a method for synthesizing perovskite nano-crystal fluorescent powder by a thermal injection method, which improves the stability of the nano-crystal fluorescent powder by coating a silicon dioxide shell on the surface of the nano-crystal fluorescent powder, but the nano-crystal fluorescent powder prepared by the method can generate obvious fluorescence peak position shift after coating, and the controllable synthesis of the peak position can not be realized.
Disclosure of Invention
The invention aims to overcome the problems that the fluorescent peak position of the nanocrystalline fluorescent powder prepared by the prior art is deviated and the controllable synthesis of the peak position cannot be realized, and provides a preparation method of the lead-organic complex-coated all-inorganic lead halogen perovskite nanocrystalline fluorescent powder.
The invention also aims to provide the lead-organic complex-coated all-inorganic lead-halogen perovskite nanocrystalline fluorescent powder.
The invention further aims to provide application of the lead-organic complex coated all-inorganic lead-halogen perovskite nano-crystalline fluorescent powder.
The above object of the present invention is achieved by the following technical solutions:
a preparation method of lead organic complex coated all-inorganic lead halogen perovskite nanocrystalline fluorescent powder comprises the following steps:
s1, adding metal halide PbX2Adding mandelic acid and oleylamine into the octadecene solution, and stirring for 0.5-5 h at the temperature of 60-160 ℃ to obtain a solution of a Pb-mandelic acid organic complex;
s2, adding an oleic acid solution of cesium carbonate into a solution of a Pb-mandelic acid organic complex, reacting for 3 s-30 min at 80-180 ℃ in an inert atmosphere, and performing post-treatment to obtain inorganic lead halide perovskite nanocrystalline fluorescent powder coated by a lead organic complex;
the metal halide PbX2The molar ratio to mandelic acid was 1: (0.5 to 5);
cesium ions and metal halide PbX in the oleic acid solution of cesium carbonate2The molar ratio of (0.5-2): 1.
the invention is realized by adding metal halide PbX2And Mandelic Acid (MA) and oleylamine are added into octadecene to prepare a solution of a Pb-mandelic acid organic complex, and a Cs source is further introduced into the solution of cesium carbonate and then the lead-organic complex-coated all-inorganic lead halide perovskite nanocrystalline fluorescent powder is synthesized in situ, so that the problem of fluorescence peak position shift caused by coating a quantum dot prepared first is solved.
The lead organic complex provides an effective space structure framework for the perovskite nanocrystalline, so that the nanocrystalline can be uniformly dispersed in the lead organic complex without agglomeration, fluorescence quenching is effectively avoided, and the nanocrystalline can keep good fluorescence performance under powder. Meanwhile, the lead organic complex has good stability, the stability of the composite material is also ensured, so that the all-inorganic perovskite nanocrystalline fluorescent powder of the lead organic complex can stably exist in an air environment, and the lead organic complex has good water stability.
The metal halide PbX of the invention2Selected from PbCl2、PbBr2、PbI2One or more of (a).
Octadecene solutions of concentrations conventional in the art may be used in the present invention. Preferably, the concentration of the octadecene solution is 90%.
Preferably, the oleylamine is an oleylamine solution, and the concentration of the oleylamine solution is 70-98%.
The mandelic acid is selected from one or more of DL-mandelic acid, D-mandelic acid and L-mandelic acid. Preferably, the mandelic acid is DL-mandelic acid.
The post-treatment of the invention comprises cooling, stirring, centrifuging, cleaning and drying in sequence. The cooling is preferably ice-water bath cooling, and the stirring time is 10 min-5 h.
Preferably, the metal halide PbX2The molar ratio to mandelic acid was 1: (0.8-2).
More preferably, the metal halide PbX2The molar ratio to mandelic acid was 1: 1.
preferably, cesium ions in an oleic acid solution of cesium carbonate are combined with a metal halide PbX2The molar ratio (0.8-1.2): 1.
preferably, the stirring temperature is 120-160 ℃ and the stirring time is 0.5-2 h.
Preferably, the reaction temperature is 140-160 ℃ and the reaction time is 3-60 s.
The lead organic complex coated inorganic lead halogen perovskite nano crystal fluorescent powder is prepared by the method.
The invention also protects the application of the lead organic complex coated all-inorganic lead halogen perovskite nano crystal fluorescent powder in the display field.
Compared with the prior art, the invention has the beneficial effects that:
the invention provides a preparation method of lead organic complex coated all-inorganic lead halogen perovskite nanocrystalline fluorescent powder, which is characterized in that the method synthesizes the lead organic complex coated all-inorganic lead halogen perovskite nanocrystalline fluorescent powder in situ, thereby overcoming the problem of fluorescence peak position shift caused by coating a quantum dot after preparing the quantum dot. The all-inorganic perovskite fluorescent powder has good fluorescence performance, can be stably stored in an air environment, has the fluorescence quantum efficiency of about 48 percent, has the emission peak position of 519nm and the half-peak width of about 17nm, is easy to store, and has wide application prospect in the field of high-performance display.
Drawings
Fig. 1 is an SEM image of the lead organic complex-coated all-inorganic lead-halogen perovskite nanocrystalline phosphor prepared in example 1.
Fig. 2 is an XRD pattern of the lead organic complex prepared in example 1.
Fig. 3 is an XRD chart of the lead-organic complex coated all-inorganic lead-halogen perovskite nano-crystalline phosphor prepared in example 1.
Fig. 4 is a photoluminescence chart of the lead-organic complex coated all-inorganic lead-halogen perovskite nanocrystalline phosphor prepared in example 1.
FIG. 5 is a graph showing the change of fluorescence intensity of the lead-organic complex-coated all-inorganic lead-halogen perovskite nanocrystalline phosphor prepared in example 1 with the time of soaking in water.
Fig. 6 is an electroluminescence diagram of LED devices prepared from the lead-organic complex-coated all-inorganic lead-halogen perovskite nanocrystalline phosphor prepared in example 1, blue chips and commercial red powder.
Fig. 7 is a graph of the fluorescence quantum yield of the lead-organic complex coated all-inorganic lead-halogen perovskite nanocrystalline phosphor prepared in example 1.
Detailed Description
In order to more clearly and completely describe the technical scheme of the invention, the invention is further described in detail by the specific embodiments, and it should be understood that the specific embodiments described herein are only used for explaining the invention, and are not used for limiting the invention, and various changes can be made within the scope defined by the claims of the invention.
Example 1
A preparation method of lead organic complex coated all-inorganic lead halogen perovskite nanocrystalline fluorescent powder comprises the following steps:
s1, adding 0.4mmol of PbBr2Adding 0.4mmol of DL-mandelic acid and 1.0mL of oleylamine with the concentration of 70% into 10mL of octadecene solution with the concentration of 90%, heating to 120 ℃, and stirring for 1h to obtain a solution of a Pb-MA organic complex;
s2, injecting 0.8mL of an oleic acid solution of cesium carbonate into the solution of the Pb-MA organic complex, reacting for 10s at 160 ℃ in a nitrogen atmosphere, cooling in an ice water bath, stirring for 1h, centrifuging the reaction solution, pouring out the supernatant, washing with methyl acetate and cyclohexane once respectively, and drying the precipitate to obtain the all-inorganic lead-halogen perovskite nanocrystalline fluorescent powder coated by the lead organic complex.
Example 2
Unlike example 1, the amount of DL-mandelic acid in this example was changed to 0.2 mmol.
Example 3
Unlike example 1, the amount of DL-mandelic acid was changed to 0.32 mmol.
Example 4
Unlike example 1, the amount of DL-mandelic acid was changed to 0.8 mmol.
Example 5
Unlike example 1, the amount of DL-mandelic acid was changed to 2.0 mmol.
Example 6
Unlike example 1, the cesium ion concentration in the oleic acid solution of cesium carbonate was 0.4 mmol/mL.
Example 7
Unlike example 1, the cesium ion concentration in the oleic acid solution of cesium carbonate was 0.6 mmol/mL.
Example 8
Unlike example 1, the cesium ion concentration in the oleic acid solution of cesium carbonate was 0.25 mmol/mL.
Example 9
Unlike example 1, the cesium ion concentration in the oleic acid solution of cesium carbonate was 1.0 mmol/mL.
Example 10
The embodiment provides a preparation method of lead organic complex coated all-inorganic lead halogen perovskite nanocrystalline fluorescent powder, which comprises the following steps:
s1, adding 0.4mmol of PbCl2Adding 0.4mmol of D-mandelic acid and 2.0mL of oleylamine with the concentration of 70% into 10mL of octadecene solution with the concentration of 90%, heating to 60 ℃, and stirring for 5 hours to obtain a solution of a Pb-MA organic complex;
s2, injecting 0.8mL of an oleic acid solution of cesium carbonate into the solution of the Pb-MA organic complex, reacting for 30min at 80 ℃ in a nitrogen atmosphere, cooling in an ice water bath, stirring for 1h, centrifuging the reaction solution, pouring out the supernatant, washing with methyl acetate and cyclohexane once respectively, and drying the precipitate to obtain the all-inorganic lead-halogen perovskite nanocrystalline fluorescent powder coated by the lead organic complex.
Example 11
The embodiment provides a preparation method of lead organic complex coated all-inorganic lead halogen perovskite nanocrystalline fluorescent powder, which comprises the following steps:
s1, adding 0.4mmol of PbI2Adding 0.4mmol L-mandelic acid and 0.2mL 98% oleylamine into 10mL 90% octadecene solution, heating to 160 deg.C, and stirring for 0.5h to obtain Pb-MA organic complex solution;
s2, injecting 0.8mL of an oleic acid solution of cesium carbonate into a solution of a Pb-MA organic complex, reacting for 3s at 180 ℃ in a nitrogen atmosphere for 1h after cooling in an ice water bath, stirring for 1h, centrifuging the reaction solution, pouring out a supernatant, washing with methyl acetate and cyclohexane once respectively, and drying the precipitate to obtain the all-inorganic lead-halogen perovskite nanocrystalline fluorescent powder coated by the lead organic complex.
Example 12
The embodiment provides a preparation method of lead organic complex coated all-inorganic lead halogen perovskite nanocrystalline fluorescent powder, which comprises the following steps:
s1, adding 0.4mmol of PbBr2Adding 0.4mmol of DL-mandelic acid and 1.0mL of oleylamine with the concentration of 70% into 10mL of octadecene solution with the concentration of 90%, heating to 120 ℃, and stirring for 0.5h to obtain a solution of a Pb-MA organic complex;
s2, injecting 0.8mL of an oleic acid solution of cesium carbonate into the solution of the Pb-MA organic complex, reacting for 3s at 160 ℃ in a nitrogen atmosphere, cooling in an ice water bath, stirring for 1h, centrifuging the reaction solution, pouring out the supernatant, washing with methyl acetate and cyclohexane once respectively, and drying the precipitate to obtain the all-inorganic lead-halogen perovskite nanocrystalline fluorescent powder coated by the lead organic complex.
Comparative example 1
The comparative example provides a preparation process of a stable fluorescent powder based on a green perovskite quantum dot coated by silicon dioxide, and the preparation process specifically comprises the following steps:
s1, accurately weighing 0.407g of cesium carbonate, 1.5mL of oleic acid and 20mL of octadecene, and adding the cesium carbonate and the oleic acid into a two-neck round-bottom flask. Heating to 130 deg.C under vacuum condition, maintaining for 1h, cooling to 100 deg.C, and introducing nitrogen;
s2, accurately weighing PbBr20.276g, weighing 20mL of octadecene, 2mL of oleic acid and 2mL of oleylamine, adding into a 100mL three-neck round-bottom flask, heating to 120 ℃ in a vacuum state, keeping for 1h, introducing nitrogen, and rapidly heating to 180 ℃;
s3, sucking 1.6mL of cesium oleate precursor solution by using an injector and quickly injecting PbBr2In the precursor solution, after 5s, rapidly cooling to room temperature in an ice-water bath;
s4, centrifuging the liquid product at 5000rpm to obtain a precipitate, adding 5mL of n-hexane, centrifuging at 5000rpm again, and taking a supernatant;
s5, adding 100 mu L of APTES into the clear liquid, stirring at room temperature for 20min, taking the precipitate, cleaning in n-hexane for 3 times, and naturally airing for 20min to obtain a final product.
The photoluminescence spectrum of the product prepared by the comparative example is shown in the attached figure 1 of patent CN 110872510A. The fluorescence peak is at 522nm and coated with SiO2The post peak is red shifted because this comparative example was prepared to obtain quantum dots prior to coating, rather than in situ synthesis.
Characterization and Performance testing
Fig. 1 is an SEM image of the lead organic complex-coated all-inorganic lead-halogen perovskite nanocrystalline phosphor prepared in example 1. As shown in fig. 1, the lead organic complex in the large size and the perovskite particles in the small size are well combined together. SEM images of all-inorganic lead-halogen perovskite nanocrystalline fluorescent powder prepared in examples 2-12 are similar to those in FIG. 1.
Fig. 2 is an XRD pattern of the lead organic complex prepared in example 1. As can be seen from fig. 2, step S1 of example 1 successfully prepares a lead organic complex. The XRD patterns of the lead organic complexes prepared in the steps S1 of the examples 2-12 are similar to those of the lead organic complexes shown in the figure 2.
Fig. 3 is an XRD chart of the lead-organic complex coated all-inorganic lead-halogen perovskite nano-crystalline phosphor prepared in example 1. As can be seen from FIG. 3, the all-inorganic lead-halogen perovskite nanocrystalline phosphor coated by the lead-organic complex is successfully prepared in example 1. XRD of the all-inorganic lead-halogen perovskite nano-crystal fluorescent powder in the embodiments 2-12 is similar to that in figure 3.
Fig. 4 is a photoluminescence chart of the lead-organic complex coated all-inorganic lead-halogen perovskite nanocrystalline phosphor prepared in example 1. As shown in FIG. 4, the fluorescent peak position of the all-inorganic lead-halogen perovskite nano-crystalline phosphor prepared in example 1 is 519nm, and the half-peak width is 17 nm. Photoluminescence patterns of the all-inorganic lead-halogen perovskite nanocrystalline phosphors described in examples 2-12 are similar to those in FIG. 4.
FIG. 5 is a graph showing the change of fluorescence intensity of the lead-organic complex-coated all-inorganic lead-halogen perovskite nanocrystalline phosphor prepared in example 1 with the time of soaking in water. As can be seen from fig. 5, the all-inorganic lead-halogen perovskite nanocrystalline phosphor prepared in example 1 is soaked in water for more than 400h, and still maintains more than 65% of the initial fluorescence intensity, which indicates that the all-inorganic lead-halogen perovskite nanocrystalline phosphor prepared in example 1 has excellent stability. The graph of the change of the fluorescence intensity of the all-inorganic lead-halogen perovskite nanocrystalline fluorescent powder prepared in the embodiments 2-12 along with the water soaking time is similar to that in the graph in FIG. 5, which shows that the all-inorganic lead-halogen perovskite nanocrystalline fluorescent powder prepared in the embodiments 2-12 has good stability.
Fig. 6 is an electroluminescence diagram of LED devices prepared from the lead-organic complex-coated all-inorganic lead-halogen perovskite nanocrystalline phosphor prepared in example 1, blue chips and commercial red powder. As shown in fig. 6, the chip with blue light emission in the electro-photoluminescence spectrogram, the all-inorganic lead-halogen perovskite nano-crystal fluorescent powder coated by the lead organic complex with green light color emission and the commercial red powder with red light emission are formed.
Fig. 7 is a graph of the fluorescence quantum yield of the lead-organic complex coated all-inorganic lead-halogen perovskite nano-crystalline phosphor prepared in example 1, and it can be seen from fig. 7 that the quantum yield of the prepared lead-organic complex coated all-inorganic lead-halogen perovskite nano-crystalline phosphor reaches 48.5%. The fluorescence quantum yield of the lead organic complex coated all-inorganic lead halogen perovskite nano crystal fluorescent powder prepared in the embodiments 2-12 is basically consistent with that of the embodiment 1.
It should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.
Claims (10)
1. A preparation method of lead organic complex coated all-inorganic lead halogen perovskite nanocrystalline fluorescent powder is characterized by comprising the following steps:
s1, adding metal halide PbX2Adding mandelic acid and oleylamine into the octadecene solution, and stirring for 0.5-5 h at the temperature of 60-160 ℃ to obtain a solution of a Pb-mandelic acid organic complex;
s2, adding an oleic acid solution of cesium carbonate into a solution of a Pb-mandelic acid organic complex, reacting for 3 s-30 min at 80-180 ℃ in an inert atmosphere, and performing post-treatment to obtain inorganic lead halide perovskite nanocrystalline fluorescent powder coated by a lead organic complex;
the metal halide PbX2The molar ratio to mandelic acid was 1: (0.5 to 5);
cesium ions and metal halide PbX in the oleic acid solution of cesium carbonate2The molar ratio of (0.5-2): 1.
2. the method for preparing the lead-organic complex coated all-inorganic lead-halogen perovskite nanocrystalline phosphor according to claim 1, wherein the metal halide PbX2Selected from PbCl2、PbBr2、PbI2One or more of (a).
3. The method for preparing the lead organic complex coated all-inorganic lead-halogen perovskite nano-crystalline phosphor according to claim 1, wherein the mandelic acid is selected from one or more of DL-mandelic acid, D-mandelic acid and L-mandelic acid.
4. The method for preparing the lead-organic complex coated all-inorganic lead-halogen perovskite nanocrystalline phosphor according to claim 1, wherein the metal halide PbX2The molar ratio to mandelic acid was 1: (0.8-2).
5. The method for preparing the lead-organic complex coated all-inorganic lead-halogen perovskite nanocrystalline phosphor according to claim 4, wherein the metal halide PbX2The molar ratio to mandelic acid was 1: 1.
6. the method for preparing lead organic complex coated all-inorganic lead-halogen perovskite nanocrystalline phosphor according to claim 1, wherein cesium ions in an oleic acid solution of cesium carbonate and a metal halide PbX2The molar ratio (0.8-1.2): 1.
7. the method for preparing the lead organic complex coated all-inorganic lead-halogen perovskite nano-crystalline phosphor according to claim 1, wherein the stirring temperature is 120-160 ℃ and the stirring time is 0.5-2 h.
8. The method for preparing the lead organic complex coated all-inorganic lead-halogen perovskite nano-crystalline phosphor according to claim 1, wherein the reaction temperature is 140-160 ℃ and the reaction time is 3-60 s.
9. An all-inorganic lead-halogen perovskite nanocrystalline fluorescent powder coated by a lead organic complex, which is characterized by being prepared by the preparation method of any one of claims 1 to 8.
10. The use of the lead organic complex coated all-inorganic lead-halogen perovskite nano-crystalline phosphor of claim 9 in the display field.
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