Core-shell perovskite quantum dot and preparation method thereof
A technology of core-shell perovskite and quantum dots, which is applied in chemical instruments and methods, nanotechnology, nano-optics, etc., can solve the problems of difficult number of perovskite quantum dots and weakened photoelectric performance, so as to improve solvent utilization rate, The effect of low cost and increased output
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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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