Method for realizing reversible conversion of halogen perovskite nanocrystal

Abstract

The invention relates to a method for realizing reversible conversion of a halogen perovskite nanocrystal, which comprises the following steps: S1, preparing a CsPbX3 nanocrystal in a hole of a mesoporous carrier to obtain a CsPbX3 nanocrystal / mesoporous carrier; and S2, conducting water mist-drying treatment to realize reversible conversion between the CsPbX3 nanocrystal and a CsPb2X5 nanocrystalin the CsPbX3 nanocrystal / mesoporous carrier. The method provided by the invention realizes multi-time controllable conversion between a fluorescent substance and a non-fluorescent substance, has theadvantages of very obvious identifiability, simple and convenient conversion conditions, fast conversion process, high conversion cycle index and the like, and lays a foundation for preparation of novel inorganic halogen perovskite.

Description

technical field

[0001] The invention relates to the technical field of nanometer materials, in particular to a method for realizing reversible conversion of halogen perovskite nanocrystals. Background technique

[0002] All-inorganic cesium lead halide perovskite (CsPbX 3 (X=Cl,Br,I,Cl / Br,Br / I)) nanocrystals have become the most promising candidates in the field of photovoltaics due to their outstanding photophysical properties, such as high fluorescence quantum yield, high luminous purity, and luminescence almost covering the entire spectrum. The hot "star material" has also shown great application advantages in the fields of electroluminescence and display.

[0003] At present, the preparation methods of all-inorganic cesium lead halide perovskite nanocrystals mainly include thermal injection method, reprecipitation method at room temperature, solvothermal method, ultrasonic method and microwave-assisted method. The above method is a direct synthesis method. Although nan...

Examples

Embodiment 1

[0040] A method to achieve reversible transformation of halogen perovskite nanocrystals, such as figure 1 As shown, the method includes:

[0041] S11. CsBr and PbBr with a molar ratio of 1:1 2 Dissolve in dimethylformamide to obtain a precursor solution, the concentration of CsBr in the precursor solution is 0.1mol / L.

[0042] S12. Take 50mg of mesoporous nano-silica white powder and place it in a 1.5mL glass vial, vacuum-dry it at 120°C for 30min, then lower the temperature to 80°C and add 100uL of the precursor in step S11 to the glass vial dropwise solution. Immediately after vacuum treatment, the precursor solution completely penetrates into the pores of mesoporous nano-silica, and then the temperature is raised to 130°C under vacuum conditions, and the vacuum is continued at this temperature until the solvent is completely evaporated and CsPbBr is crystallized. 3 nanocrystals, during the evaporation of the solvent, the white powder gradually turns into a yellow powder,...

Embodiment 2

[0055] A method to achieve reversible transformation of halogen perovskite nanocrystals, such as figure 1 As shown, the method includes:

[0056] S11. Cs(Cl / Br) and Pb(Cl / Br) with a molar ratio of 1:1.5 2 Dissolve in dimethyl sulfoxide to obtain a precursor solution, the concentration of Cs(Cl / Br) in the precursor solution is 0.2mol / L.

[0057] S12. Take 50mg of mesoporous nano-alumina powder and place it in a 1.5mL glass vial, dry it in vacuum at 110°C for 40min, then lower the temperature to 70°C and add 100uL of the precursor in step S11 to the glass vial dropwise solution. Immediately after vacuum treatment, the precursor solution completely penetrates into the pores of mesoporous nano-alumina, and then the temperature is raised to 120°C under vacuum conditions, and the vacuum is continued at this temperature until the solvent is completely evaporated and crystallized. CsPb(Cl / Br) 3 Nano crystals, during the solvent evaporation process, the white powder gradually turns...

Embodiment 3

[0063] A method to achieve reversible transformation of halogen perovskite nanocrystals, such as figure 1 As shown, the method includes:

[0064] S11. CsBr and PbBr with a molar ratio of 1:1 2 dissolved in tetrahydrofuran to obtain a precursor solution, and the concentration of CsBr in the precursor solution is 0.15 mol / L.

[0065] S12. Take 50 mg of white powder of mesoporous nano-molecular sieve SBA-5 and place it in a 1.5 mL glass vial. After vacuum drying at 130 °C for 20 min, lower the temperature to 90 °C and add 100 uL of the precursor in step S11 to the glass vial. substance solution. Immediately after vacuum treatment, the precursor solution completely infiltrated into the pores of mesoporous nano-molecular sieve SBA-5, and then the temperature was raised to 140°C under vacuum conditions, and the vacuum was continued at this temperature until the solvent was completely evaporated and crystallized out. CbBr 3 Nano crystals, during this solvent evaporation process, ...

technical field

[0001] The invention relates to the technical field of nanometer materials, in particular to a method for realizing reversible conversion of halogen perovskite nanocrystals. Background technique

[0002] All-inorganic cesium lead halide perovskite (CsPbX 3 (X=Cl,Br,I,Cl / Br,Br / I)) nanocrystals have become the most promising candidates in the field of photovoltaics due to their outstanding photophysical properties, such as high fluorescence quantum yield, high luminous purity, and luminescence almost covering the entire spectrum. The hot "star material" has also shown great application advantages in the fields of electroluminescence and display.

[0003] At present, the preparation methods of all-inorganic cesium lead halide perovskite nanocrystals mainly include thermal injection method, reprecipitation method at room temperature, solvothermal method, ultrasonic method and microwave-assisted method. The above method is a direct synthesis method. Although nan...

Examples

Embodiment 1

[0040] A method to achieve reversible transformation of halogen perovskite nanocrystals, such as figure 1 As shown, the method includes:

[0041] S11. CsBr and PbBr with a molar ratio of 1:1 2 Dissolve in dimethylformamide to obtain a precursor solution, the concentration of CsBr in the precursor solution is 0.1mol / L.

[0042] S12. Take 50mg of mesoporous nano-silica white powder and place it in a 1.5mL glass vial, vacuum-dry it at 120°C for 30min, then lower the temperature to 80°C and add 100uL of the precursor in step S11 to the glass vial dropwise solution. Immediately after vacuum treatment, the precursor solution completely penetrates into the pores of mesoporous nano-silica, and then the temperature is raised to 130°C under vacuum conditions, and the vacuum is continued at this temperature until the solvent is completely evaporated and CsPbBr is crystallized. 3 nanocrystals, during the evaporation of the solvent, the white powder gradually turns into a yellow powder,...

Embodiment 2

[0055] A method to achieve reversible transformation of halogen perovskite nanocrystals, such as figure 1 As shown, the method includes:

[0056] S11. Cs(Cl / Br) and Pb(Cl / Br) with a molar ratio of 1:1.5 2 Dissolve in dimethyl sulfoxide to obtain a precursor solution, the concentration of Cs(Cl / Br) in the precursor solution is 0.2mol / L.

[0057] S12. Take 50mg of mesoporous nano-alumina powder and place it in a 1.5mL glass vial, dry it in vacuum at 110°C for 40min, then lower the temperature to 70°C and add 100uL of the precursor in step S11 to the glass vial dropwise solution. Immediately after vacuum treatment, the precursor solution completely penetrates into the pores of mesoporous nano-alumina, and then the temperature is raised to 120°C under vacuum conditions, and the vacuum is continued at this temperature until the solvent is completely evaporated and crystallized. CsPb(Cl / Br) 3 Nano crystals, during the solvent evaporation process, the white powder gradually turns...

Embodiment 3

[0063] A method to achieve reversible transformation of halogen perovskite nanocrystals, such as figure 1 As shown, the method includes:

[0064] S11. CsBr and PbBr with a molar ratio of 1:1 2 dissolved in tetrahydrofuran to obtain a precursor solution, and the concentration of CsBr in the precursor solution is 0.15 mol / L.

[0065] S12. Take 50 mg of white powder of mesoporous nano-molecular sieve SBA-5 and place it in a 1.5 mL glass vial. After vacuum drying at 130 °C for 20 min, lower the temperature to 90 °C and add 100 uL of the precursor in step S11 to the glass vial. substance solution. Immediately after vacuum treatment, the precursor solution completely infiltrated into the pores of mesoporous nano-molecular sieve SBA-5, and then the temperature was raised to 140°C under vacuum conditions, and the vacuum was continued at this temperature until the solvent was completely evaporated and crystallized out. CbBr 3 Nano crystals, during this solvent evaporation process, ...

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