CN115386364B - Preparation method of blue-light perovskite quantum dot - Google Patents
Preparation method of blue-light perovskite quantum dot Download PDFInfo
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Abstract
The invention belongs to the technical field of photoelectric material preparation, and particularly relates to a preparation method of blue perovskite quantum dots. The invention provides a preparation method of blue light perovskite quantum dots, which comprises the following steps: primary mixing water-soluble cesium salt, water-soluble rubidium salt, lead-containing compound, stabilizer and nonpolar organic solvent, and carrying out liquid phase reaction to obtain a primary mixture; mixing the primary mixture with phenylphosphonic dichloride in a secondary stage, and carrying out a first coordination reaction to obtain a quantum dot crystal blank; and (3) mixing the quantum dot crystal blank, tetraoctyl ammonium fluoride, benzoyl bromide and toluene three-stage, and carrying out a second coordination reaction to obtain the Lan Guanggai titanium ore quantum dot. The blue perovskite quantum dot obtained by the method has narrower half-height peak width and higher color purity.
Description
Technical Field
The invention belongs to the technical field of photoelectric material preparation, and particularly relates to a preparation method of blue perovskite quantum dots.
Background
Currently, after undergoing the first generation display technology (cathode ray tube) and the second generation display technology (liquid crystal display), the third generation display technology, i.e., the light emitting diode display technology, has been developed. And perovskite quantum dots are the main luminescent materials of the light-emitting diode display technology due to the excellent optical properties.
The perovskite quantum dots mainly comprise red light perovskite quantum dots, green light perovskite quantum dots and blue light perovskite quantum dots. The light-emitting performance of the traditional blue perovskite quantum dot is far behind that of red and green perovskite quantum dots, and the commercial application of the blue perovskite quantum dot is hindered.
In recent years, the luminescent performance of the blue perovskite quantum dots can be further improved by optimizing the preparation method of the blue perovskite quantum dots; however, the obtained blue perovskite quantum dot still has the defect of wider half-height peak width, so that the color purity of the blue perovskite quantum dot is lower, and the application of the blue perovskite quantum dot in high-color-gamut display is limited.
Disclosure of Invention
The invention aims to provide a preparation method of blue perovskite quantum dots, and the blue perovskite quantum dots obtained by the method have narrower half-height peak width and higher color purity.
In order to achieve the above object, the present invention provides the following technical solutions:
the invention provides a preparation method of blue light perovskite quantum dots, which comprises the following steps:
primary mixing water-soluble cesium salt, water-soluble rubidium salt, lead-containing compound, stabilizer and nonpolar organic solvent, and carrying out liquid phase reaction to obtain a primary mixture;
mixing the primary mixture with phenylphosphonic dichloride in a secondary stage, and carrying out a first coordination reaction to obtain a quantum dot crystal blank;
and (3) mixing the quantum dot crystal blank, tetraoctyl ammonium fluoride, benzoyl bromide and toluene three-stage, and carrying out a second coordination reaction to obtain the Lan Guanggai titanium ore quantum dot.
Preferably, the water-soluble cesium salt comprises one or more of cesium carbonate, cesium acetate and cesium nitrate;
the water-soluble rubidium salt comprises one or more of rubidium carbonate, rubidium acetate and rubidium nitrate;
the lead-containing compound comprises lead oxide and/or lead acetate;
the stabilizer comprises oleylamine and oleic acid;
the nonpolar organic solvent includes octadecene and/or diphenyl ether.
Preferably, the molar ratio of oleic acid to oleylamine is (5-10): (10-30);
the molar ratio of the water-soluble cesium salt, the water-soluble rubidium salt, the lead-containing compound, the oleic acid and the oleylamine is 0.175:0.075:1: (5-10): (10-30).
The usage ratio of the lead-containing compound to the nonpolar organic solvent is 1mmol: 20-30 mL.
Preferably, the liquid phase reaction comprises sequentially performing a first liquid phase reaction and a second liquid phase reaction.
Preferably, the first liquid phase reaction is performed by: heating to 100-120 ℃ at a heating rate of 10-15 ℃/min under the condition of stirring, and preserving heat for 30-60 min; the first liquid phase reaction is carried out under vacuum conditions;
the second liquid phase reaction comprises the following steps: heating to 260 ℃ at a heating rate of 10-15 ℃/min under the condition of stirring to obtain the primary mixture; the second liquid phase reaction is carried out under a protective atmosphere.
Preferably, the molar ratio of the lead-containing compound to the phenylphosphonic dichloride is 1:2 to 4.
Preferably, the first coordination reaction is performed under a protective atmosphere;
the temperature of the first coordination reaction is 260 ℃ and the time is 15-20 s.
Preferably, the first complexation reaction is terminated by cooling; the cooling rate of the cooling treatment is 50-60 ℃/s.
Preferably, the mass ratio of the quantum dot crystal blank to the tetraoctyl ammonium fluoride to the benzoyl bromide is 1:2:2 to 3;
the dosage ratio of the quantum dot crystal blank to toluene is 5-10 mg:1mL.
Preferably, the temperature of the second coordination reaction is 25-30 ℃ and the time is 40-45 min.
The invention provides a preparation method of blue light perovskite quantum dots, which comprises the following steps: primary mixing water-soluble cesium salt, water-soluble rubidium salt, lead-containing compound, stabilizer and nonpolar organic solvent, and carrying out liquid phase reaction to obtain a primary mixture; mixing the primary mixture with phenylphosphonic dichloride in a secondary stage, and carrying out a first coordination reaction to obtain a quantum dot crystal blank; and (3) mixing the quantum dot crystal blank, tetraoctyl ammonium fluoride, benzoyl bromide and toluene three-stage, and carrying out a second coordination reaction to obtain the Lan Guanggai titanium ore quantum dot. In the present invention, benzoyl bromide provides the quantum dots with anion-exchanged Br ions; tetraoctyl ammonium fluoride can be used as a high-efficiency stable displacement ligand to displace the ligand which is easy to desorb on the surface of the quantum dot, so that the stability of the quantum dot is enhanced; meanwhile, after preparing a crystal blank through high-temperature quenching, gradually growing the quantum dots into crystals with uniform particle sizes through a slow and stable regrowth environment, and finally, enabling the half-height peak width of the obtained blue perovskite quantum dots to be narrower and enabling the color purity to be higher.
Drawings
FIG. 1 is an absorption spectrum, a fluorescence spectrum and a fluorescence spectrum of the blue perovskite quantum dot obtained in example 1;
FIG. 2 is a graph showing the fluorescence quantum yield test of blue perovskite quantum dots obtained in example 1;
fig. 3 is a graph showing the change in fluorescence quantum yield over time of perovskite quantum dots obtained in example 1 and comparative example 1.
Detailed Description
The invention provides a preparation method of blue light perovskite quantum dots, which comprises the following steps:
primary mixing water-soluble cesium salt, water-soluble rubidium salt, lead-containing compound, stabilizer and nonpolar organic solvent, and carrying out liquid phase reaction to obtain a primary mixture;
mixing the primary mixture with phenylphosphonic dichloride in a secondary stage, and carrying out a first coordination reaction to obtain a quantum dot crystal blank;
and (3) mixing the quantum dot crystal embryo, tetraoctyl ammonium fluoride, benzoyl bromide and toluene three-stage, and carrying out a second coordination reaction to obtain the Lan Guanggai titanium ore quantum dot.
In the present invention, all the preparation materials are commercially available products well known to those skilled in the art unless specified otherwise.
The invention mixes water-soluble cesium salt, water-soluble rubidium salt, lead-containing compound, stabilizer and nonpolar organic solvent for the first stage, and obtains the first-stage mixture through liquid phase reaction.
In the present invention, the water-soluble cesium salt preferably includes one or more of cesium carbonate, cesium acetate and cesium nitrate. In the present invention, the water-soluble rubidium salt preferably comprises one or more of rubidium carbonate, rubidium acetate and rubidium nitrate. In the present invention, the lead-containing compound preferably includes lead oxide and/or lead acetate. In the present invention, the nonpolar organic solvent preferably includes octadecene and/or diphenyl ether.
In the present invention, the stabilizer preferably includes oleylamine and oleic acid; the mol ratio of oleic acid to oleylamine is (5-10): (10 to 30), more preferably (6 to 9): (12 to 28), more preferably (7 to 8): (15-25).
In the present invention, the molar ratio of the water-soluble cesium salt, the water-soluble rubidium salt, the lead-containing compound, oleic acid and oleylamine is preferably 0.175:0.075:1: (5-10): (10 to 30), more preferably 0.175:0.075:1: (6-9): (12 to 28), more preferably 0.175:0.075: (7-8): (15-25).
In the present invention, the ratio of the lead-containing compound to the nonpolar organic solvent is preferably 1mmol:20 to 30mL, more preferably 1mmol:12 to 28mL, more preferably 1mmol: 15-25 mL.
The primary mixing process is not particularly limited, and may be performed by a process well known to those skilled in the art.
In the present invention, the liquid phase reaction preferably includes sequentially performing a first liquid phase reaction and a second liquid phase reaction. In the present invention, the process of the first liquid phase reaction is preferably: heating to 100-120 ℃ at a heating rate of 10-15 ℃/min under the condition of stirring, and preserving heat for 30-60 min; the first liquid phase reaction is carried out under vacuum. In the present invention, the stirring speed is preferably 400 to 500rpm. In the present invention, the raw material can be dissolved by performing the first liquid phase reaction.
In the present invention, the process of the second liquid phase reaction is preferably: heating to 260 ℃ at a heating rate of 10-15 ℃/min under the condition of stirring to obtain the primary mixture; the second liquid phase reaction is carried out under a protective atmosphere. In the present invention, the rotation speed of the stirring is preferably 400 to 500rpm. In the present invention, the protective atmosphere is preferably argon.
After the primary mixture is obtained, the primary mixture and the phenylphosphonic dichloride are mixed in a secondary mode, and the quantum dot crystal blank is obtained through a first coordination reaction.
In the present invention, the molar ratio of the lead-containing compound to phenylphosphonic dichloride is preferably 1:2 to 4, more preferably 1:3. in the present invention, the first coordination reaction is preferably performed under a protective atmosphere; the protective atmosphere is preferably argon. In the present invention, the temperature of the first coordination reaction is preferably 260℃and the time is preferably 15 to 20s. In the present invention, the first coordination reaction is preferably terminated by a cooling treatment. In the present invention, the cooling rate of the cooling treatment is preferably 50 to 60 ℃/s. In a specific embodiment of the present invention, the cooling treatment is preferably performed by placing the reaction solution in an ice-water bath. In the invention, the reaction is terminated rapidly by using a larger temperature difference through cooling treatment, so that crystals can be precipitated rapidly, and a large number of quantum dot crystal blanks are obtained.
After the first coordination reaction is terminated, the method also preferably comprises the step of carrying out post-treatment on the obtained reaction solution; the post-treatment preferably comprises the steps of:
standing the obtained reaction liquid, recovering the temperature of the reaction liquid to room temperature, and obtaining a first precipitate through first separation;
mixing the first precipitate with n-hexane for the first time, and performing second separation to obtain a first supernatant;
mixing the supernatant with methyl acetate for the second time, and carrying out third separation to obtain a second precipitate;
and thirdly mixing the second precipitate with toluene to obtain a toluene solution containing quantum dot crystal embryos.
In the present invention, the first separation means is preferably centrifugal separation; the rotational speed of the centrifugal separation is preferably 10000rpm and the time is preferably 5min.
In the present invention, the ratio of the amount of the first precipitate to the amount of n-hexane is preferably 10mg:1mL.
The process of the first mixing is not particularly limited, and may be performed by a process well known to those skilled in the art.
In the present invention, the second separation means is preferably centrifugal separation; the rotational speed of the centrifugal separation is preferably 4000rpm and the time is preferably 1min.
In the present invention, the volume ratio of the first supernatant to methyl acetate is preferably 1:3. the second mixing process is not particularly limited, and may be performed by a process well known to those skilled in the art. In the present invention, the third separation means is preferably centrifugal separation; the rotational speed of the centrifugal separation is preferably 10000rpm and the time is preferably 5min.
In the invention, the methyl acetate is adopted to clean the crystal blank of the quantum dot, so that excessive ligand on the surface of the quantum dot can be removed.
The third mixing mode is not particularly limited, and may be performed by a process well known to those skilled in the art. In the present invention, the concentration of the quantum dot embryo in the toluene solution containing the quantum dot embryo is preferably 10mg/mL.
In the invention, cesium ions and lead ions in the solution and chloride ions provided by injected phenylphosphonic dichloride are subjected to crystal growth through rapid crystallization reaction at high temperature; meanwhile, the crystallization reaction is stopped by the action of the ice water bath rapid cooling and the surface ligand, and finally the quantum dot crystal embryo with smaller particle size is obtained.
After the quantum dot crystal embryo is obtained, the quantum dot crystal embryo, tetraoctyl ammonium fluoride, benzoyl bromide and toluene are mixed three-stage, and the deep blue perovskite quantum dot is obtained through a second coordination reaction.
In the invention, the mass ratio of the quantum dot crystal blank to the tetraoctyl ammonium fluoride to the benzoyl bromide is preferably 1:2:2 to 3. In the invention, the dosage ratio of the quantum dot embryo to toluene is preferably 5-10 mg:1mL.
In the invention, the quantum dot embryo is preferably subjected to three-stage mixing in the form of a quantum dot embryo toluene solution. In the present invention, the toluene solution of the quantum dot embryo is preferably the toluene solution containing the quantum dot embryo according to the above technical scheme.
In the present invention, the tetraoctyl ammonium fluoride is preferably tertiary mixed in the form of a toluene solution of tetraoctyl ammonium fluoride. In the present invention, the concentration of tetraoctyl ammonium fluoride in the toluene solution of tetraoctyl ammonium fluoride is preferably 150mg/mL. The preparation method of the tetraoctyl ammonium fluoride toluene solution is not particularly limited, and the tetraoctyl ammonium fluoride and toluene are directly mixed and strongly stirred until the mixture is clear.
In the invention, the three-stage mixing process is as follows: and adding the tetraoctyl ammonium fluoride toluene solution and benzoyl bromide into the quantum dot embryo toluene solution under the condition of stirring.
In the present invention, the rotation speed of the stirring is preferably 400 to 600rpm, more preferably 450 to 550rpm.
In the present invention, the temperature of the second coordination reaction is preferably 25 to 30℃and the time is preferably 40 to 45 minutes.
According to the invention, through adopting tetraoctyl ammonium fluoride and benzoyl bromide to conduct curing and regrowing treatment on the quantum dot crystal embryo, excessive halogen ions can be introduced into the quantum dot, a halogen ion-rich environment is constructed, and then lattice defects and surface defects caused by halogen vacancies are reduced; on the other hand, by introducing tetraoctyl ammonium fluoride, the coordination capacity of tetraoctyl ammonium and halogen ions on the surface of the quantum dot is increased by utilizing the larger electronegativity of fluoride ions, and the stability and optical performance of the quantum dot are improved by utilizing the stronger coordination capacity of tetraoctyl ammonium relative to protonated oleyl amine groups and halogen ions.
After the second coordination reaction is completed, the invention also preferably comprises post-treatment of the reaction solution; the post-treatment is preferably: fourth mixing the reaction solution with methyl acetate, and fourth separating to obtain a third precipitate;
and fifth mixing the third precipitate and normal hexane, and fifth separating to retain a second supernatant.
In the present invention, the volume ratio of the reaction liquid to methyl acetate is preferably 1:2 to 3. In the present invention, the fourth separation means is preferably centrifugal separation; the rotational speed of the centrifugal separation is preferably 10000rpm and the time is preferably 5min.
In the present invention, the ratio of the amount of the third precipitate to the amount of n-hexane is preferably 10mg:1mL. In the present invention, the fifth separation means is preferably centrifugal separation; the rotational speed of the centrifugal separation is preferably 6000rpm and the time is preferably 1min.
In the present invention, the second supernatant preferably includes blue perovskite quantum dots and n-hexane. In the present invention, the blue perovskite quantum dots are preferably present in the form of a blue perovskite quantum dot n-hexane solution.
In the invention, the structural formula of the blue perovskite quantum dot is preferably Cs x Rb 1-x PbCl 3 Br 3-y The method comprises the steps of carrying out a first treatment on the surface of the The value range of x is preferably 0 < x < 1; the value range of y is preferably 0-3.
For further explanation of the present invention, the following describes in detail a preparation method of blue perovskite quantum dots provided by the present invention with reference to the accompanying drawings and examples, but they should not be construed as limiting the scope of the present invention.
Example 1
Adding 0.105mmol of cesium carbonate, 0.045mmol of rubidium carbonate, 0.6mmol of lead oxide, 3mmol of oleic acid, 6mmol of oleylamine and 15mL of octadecene as solvents into a two-neck flask, mixing, heating to 120 ℃ at a heating rate of 10 ℃/min under stirring (the rotating speed is 400 rpm) and vacuum conditions, and preserving heat for 50min; then replacing the atmosphere with argon, and heating to 260 ℃ at a heating rate of 10 ℃/min under the condition of stirring (the rotating speed is 400 rpm) to obtain a first-stage mixture;
0.35g of phenylphosphonic acid dichloride was added to the above primary mixture, reacted at a rotation speed of 400rpm under argon atmosphere at a temperature of 260℃for 15 seconds, and then cooled by an ice-water bath (cooling rate: 50 ℃ C./s) to terminate the above reaction;
standing the obtained reaction solution, recovering the temperature to room temperature, centrifuging at 10000rpm for 5min, and collecting 100mg precipitate; dispersing the obtained precipitate in 10mL of n-hexane, centrifuging at 4000rpm for 1min, and collecting 10mL of supernatant; adding the obtained supernatant into 30mL of methyl acetate, and centrifuging at 10000rpm for 5min to obtain 100mg of precipitate; mixing the obtained precipitate with 10mL of toluene to obtain a toluene solution containing quantum dot crystal embryos;
1500 mu L of tetraoctyl ammonium fluoride toluene solution with the concentration of 150mg/mL and 230mg of benzoyl bromide are added into the toluene solution containing quantum dot embryo obtained by the above method at the stirring speed of 450rpm, 30mL of methyl acetate is added after the reaction is carried out for 40min at 25 ℃, centrifugation is carried out for 5min at 10000rpm, and 50mg of precipitate is collected; the obtained precipitate was dispersed in 5mL of n-hexane, centrifuged at 6000rpm for 1min, and the precipitate was removed to obtain an n-hexane solution containing perovskite quantum dots.
Example 2
Adding 0.105mmol of cesium carbonate, 0.045mmol of rubidium carbonate, 0.6mmol of lead oxide, 3mmol of oleic acid and 6mmol of oleylamine into a two-neck flask, mixing, adding 15ml of octadecene as a solvent, heating to 100 ℃ at a heating rate of 10 ℃/min under stirring (the rotating speed is 450 pm) and vacuum conditions, and preserving heat for 50min; then replacing the atmosphere with argon, and heating to 260 ℃ at a heating rate of 15 ℃/min under the condition of stirring (the rotating speed is 400 rpm) to obtain a first-stage mixture;
0.4g of phenylphosphonic acid dichloride was added to the above primary mixture, reacted at a rotation speed of 400rpm under argon atmosphere at a temperature of 260℃for 15 seconds, and then cooled by an ice-water bath (cooling rate: 50 ℃ C./s) to terminate the above reaction;
standing the obtained reaction solution, recovering the temperature to room temperature, centrifuging at 10000rpm for 5min, and collecting 100mg precipitate; dispersing the obtained precipitate in 10mL of n-hexane, centrifuging at 4000rpm for 1min, and collecting 10mL of supernatant; adding the obtained supernatant into 30mL of methyl acetate, and centrifuging at 10000rpm for 5min to obtain 100mg of precipitate; mixing the obtained precipitate with 10mL of toluene to obtain a toluene solution containing quantum dot crystal embryos;
1500 mu L of tetraoctyl ammonium fluoride toluene solution with the concentration of 150mg/mL and 230mg of benzoyl bromide are added into the toluene solution containing quantum dot embryo obtained by the above method at the stirring speed of 450rpm, 30mL of methyl acetate is added after the reaction is carried out for 40min at 25 ℃, centrifugation is carried out for 5min at 10000rpm, and 50mg of precipitate is collected; the obtained precipitate was dispersed in 5mL of n-hexane, centrifuged at 6000rpm for 1min, and the precipitate was removed to obtain an n-hexane solution containing perovskite quantum dots.
Comparative example 1
Perovskite quantum dots were prepared as in example 1, except that tetraoctylammonium fluoride toluene solution was not added.
Performance testing
Test example 1
The absorption spectrum diagram, the fluorescence spectrum diagram and the fluorescence real image of the perovskite quantum dot obtained in the embodiment 1 are shown in fig. 1, and as can be seen from fig. 1, the maximum emission peak position of the perovskite quantum dot obtained in the invention is 459nm, and the perovskite quantum dot can emit deep blue fluorescence, and the half-height peak width is 15.82nm.
Test example 2
The perovskite quantum dots obtained in example 1 were tested for fluorescence quantum yield using an integrating sphere under the following conditions: the instrument model HORIBA FLORAMMAX-3 has excitation wavelength of 365nm, scanning speed of 1nm/s and slit width of 2nm; the obtained test curve and test result are shown in fig. 2, and it can be seen from fig. 2 that the highest fluorescence quantum yield of the perovskite quantum dot obtained in this example is 92.13%.
Test example 3
The perovskite quantum dots of example 1 and comparative example 1 were placed in an atmospheric environment, and the change value of fluorescence quantum yield with time was tested under the following conditions: instrument model HORIBA FLORAMAX-3, excitation wavelength 365nm, scan speed 1nm/s, slit width 2nm, fluorescence quantum yields on day 1, day 4, day 10 and day 30 were recorded, respectively;
the resulting fluorescence quantum yield over time is shown in FIG. 3; as can be seen from fig. 3, the quantum dot added with tetraoctyl ammonium fluoride as a high-efficiency displacement passivation ligand in example 1 has more excellent stability and can be stored for a longer time in an atmospheric environment.
Although the foregoing embodiments have been described in some, but not all embodiments of the invention, other embodiments may be obtained according to the present embodiments without departing from the scope of the invention.
Claims (6)
1. The preparation method of the blue perovskite quantum dot is characterized by comprising the following steps of:
mixing water-soluble cesium salt, water-soluble rubidium salt, lead-containing compound, stabilizer and nonpolar organic solvent, and performing liquid phase reaction to obtain a first-stage mixture;
mixing the primary mixture with phenylphosphonic dichloride, and carrying out a first coordination reaction to obtain a quantum dot crystal blank; the first coordination reaction is carried out under a protective atmosphere; the temperature of the first coordination reaction is 260 ℃ and the time is 15-20 s; the first coordination reaction is terminated by cooling treatment; the cooling rate of the cooling treatment is 50-60 ℃/s; the cooling treatment process is to put the reaction liquid into an ice-water bath for cooling treatment; after the first coordination reaction is terminated, standing the obtained reaction solution to restore the temperature of the reaction solution to room temperature;
mixing the quantum dot crystal blank, tetraoctyl ammonium fluoride, benzoyl bromide and toluene, and carrying out a second coordination reaction to obtain the Lan Guanggai titanium ore quantum dot; the temperature of the second coordination reaction is 25-30 ℃ and the time is 40-45 min;
the water-soluble cesium salt comprises one or more of cesium carbonate, cesium acetate and cesium nitrate;
the water-soluble rubidium salt comprises one or more of rubidium carbonate, rubidium acetate and rubidium nitrate;
the lead-containing compound comprises lead oxide and/or lead acetate;
the stabilizer comprises oleylamine and oleic acid;
the nonpolar organic solvent includes octadecene and/or diphenyl ether.
2. The preparation method according to claim 1, wherein the molar ratio of oleic acid to oleylamine is (5-10): (10-30);
the molar ratio of the water-soluble cesium salt, the water-soluble rubidium salt, the lead-containing compound, the oleic acid and the oleylamine is 0.175:0.075:1: (5-10): (10-30);
the usage ratio of the lead-containing compound to the nonpolar organic solvent is 1mmol: 20-30 mL.
3. The method of claim 1, wherein the liquid phase reaction comprises sequentially performing a first liquid phase reaction and a second liquid phase reaction.
4. A method of preparing according to claim 3, wherein the first liquid phase reaction is performed by: heating to 100-120 ℃ at a heating rate of 10-15 ℃/min under the condition of stirring, and preserving heat for 30-60 min; the first liquid phase reaction is carried out under vacuum conditions;
the second liquid phase reaction comprises the following steps: heating to 260 ℃ at a heating rate of 10-15 ℃/min under the condition of stirring to obtain the primary mixture; the second liquid phase reaction is carried out under a protective atmosphere.
5. The production method according to claim 1, wherein the molar ratio of the lead-containing compound to phenylphosphonic dichloride is 1: 2-4.
6. The preparation method according to claim 1, wherein the mass ratio of the quantum dot crystal blank to the tetraoctyl ammonium fluoride to the benzoyl bromide is 1:2: 2-3;
the dosage ratio of the quantum dot crystal blank to toluene is 5-10 mg:1mL.
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| Anion Exchange in Cesium Lead Halide Perovskite Nanocrystals and Thin Films Using Trimethylsilyl Halide Reagents;Creutz, Sidney E.等;《CHEMISTRY OF MATERIALS 》;第30卷(第15期);全文 * |
| 基于两性离子的高稳定性全无机钙钛矿量子点及LED研究;郭思宇;《中国优秀硕士学位论文全文数据库 基础科学辑》;全文 * |
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