A kind of core-shell perovskite quantum dot and its preparation method
A technology of core-shell perovskite and quantum dots, applied in chemical instruments and methods, organic chemistry, nanotechnology for materials and surface science, etc., can solve problems such as the difficulty in the number of perovskite quantum dots and the weakening of photoelectric properties
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Embodiment 1
[0032] A core-shell perovskite CH 3 NH 3 PB 3 @SiO 2 The preparation method of quantum dots, its preparation process see figure 1 ,Proceed as follows:
[0033] (1) Add 2.0 mmolCH 3NH 3 I and 0mol octadecadecrowth ether were dissolved in 10 mL benzene to prepare the perovskite precursor solution CH 3 NH 3 I-S.
[0034] (2) Add 2.0 mmolPbI 2 , 2.0 mmol octadecadecrown ether and 2.0 mmol 3-aminopropyltrimethoxysilane were dissolved in 10 mL benzene to prepare the perovskite precursor solution PbI 2 -S.
[0035] (3) Preparation of core-shell perovskite quantum dots: 10 mL CH 3 NH 3 I-S solution with 10 mL PbI 2 -S solutions were mixed and stirred at room temperature for 3 h to obtain core-shell perovskite CH with a particle size of 20 nm 3 NH 3 PB 3 @SiO 2 Colloidal solutions of quantum dots.
[0036] After the colloidal solution in Example 1 was centrifuged at high speed (10000 rpm) and dried, CH 3 NH 3 PB 3 @SiO 2 Quantum dot dry powder, from the ratio of ...
Embodiment 2
[0039] A core-shell perovskite CsPbBr 3 @SiO 2 The preparation method of quantum dots, its preparation process see figure 1 ,Proceed as follows:
[0040] (1) Dissolve 5.0 mmol of CsBr and 5.0 mmol of cyclodextrin in 10 mL of toluene to prepare perovskite precursor solution CsBr-S.
[0041] (2) Add 5.0 mmol PbBr 2 , 5.0 mmol cyclodextrin and 5.0 mmol 3-aminopropyltriethoxysilane were dissolved in 10 mL toluene to prepare the perovskite precursor solution PbBr 2 -S.
[0042] (3) Preparation of core-shell perovskite quantum dots: mix 10 mL of CsBr-S solution with 10 mL of PbBr 2 -S solutions were mixed and stirred at room temperature for 1 h to obtain 0.25 mol / L core-shell perovskite CsPbBr with a particle size of 15 nm 3 @SiO 2 Colloidal solutions of quantum dots.
[0043] After centrifuging and drying the colloid solution in Example 2 at high speed (10000 rpm), CsPbBr was obtained 3 @SiO 2 Quantum dot dry powder, from the ratio of its weight to the total weight of th...
Embodiment 3
[0045] Example 3: A core-shell perovskite CsSnCl 3 @SiO 2 The preparation method of quantum dots, its preparation process see figure 1 ,Proceed as follows:
[0046] (1) Dissolve 10 mmol CsCl and 10 mmol calixarene in 10 mL n-hexane to prepare perovskite precursor solution CH 3 NH 3 Br-S.
[0047] (2) 10 mmol SnCl 2 , 10mmol calixarene and 10mmol 3-aminopropylmethyldiethoxysilane were dissolved in 10 mL of n-hexane to prepare the perovskite precursor solution SnCl 2 -S.
[0048] (3) Preparation of core-shell perovskite quantum dots: mix 10 mL of CsCl-S solution with 10 mL of SnCl 2 -S solutions were mixed and stirred at room temperature for 9 h to obtain 0.50 mol / L core-shell perovskite CsSnCl with a particle size of 30 nm 3 @SiO 2 Colloidal solutions of quantum dots.
[0049] After centrifuging and drying the colloidal solution in Example 3 at high speed (10000 rpm), CsPbBr was obtained 3 @SiO 2 Quantum dot dry powder, from the ratio of its weight to the total wei...
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