Halide-coated halogen perovskite quantum dots and preparation method thereof
A halide and perovskite technology, which is applied in the field of halide-coated halogen perovskite quantum dots and its preparation, can solve problems such as lack, achieve narrow half-peak width, simple preparation method, and improve the effect of luminous quantum efficiency
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Embodiment 1
[0024] BiOBr coated CsPbBr 3 The preparation of quantum dots comprises the following steps:
[0025] Press CsPbBr 3 The mass ratio of quantum dots to BiOBr is 1:1, weigh CsPbBr 3 Put quantum dots in an agate mortar, add BiOBr, and grind evenly, the halogen elements in the two are exchanged to a certain extent, and CsPbBr is obtained 3 / BiOBr precursor mixed powder, put the precursor mixed powder into the crucible, and calcined at 600°C for 0.5h in the argon of the tube furnace to obtain BiOBr-coated CsPbBr 3 Perovskite quantum dots.
[0026] Obtain BiOBr coating CsPbBr to present embodiment 3 Perovskite quantum dots were observed by transmission electron microscopy, and the thickness of the BiOBr shell was 1 nm.
[0027] Obtain BiOBr coating CsPbBr to present embodiment 3 The quantum efficiency of perovskite quantum dots detected by the integrating sphere of the fluorometer is 95%; the present embodiment obtains BiOBr coated CsPbBr 3 At 25°C and 40% humidity, the perovs...
Embodiment 2
[0029] BiOCl y Br 1-y Coated CsSnBr x Cl 3-x The preparation of perovskite quantum dots comprises the following steps:
[0030] Press CsSnBr 3 The mass ratio of quantum dots to BiOCl is 1:10, weigh CsSnBr 3 Put the quantum dots in the ball mill, add BiOCl, grind evenly, and the halogen elements in the two are exchanged to a certain extent to obtain CsSnBr x Cl 3-x / BiOCl y Br 1-y Precursor mixed powder, put the precursor mixed powder into a crucible, and calcined at 1000°C for 4h in the argon atmosphere of the tube furnace to obtain BiOCl y Br 1-y Coated CsSnBr x Cl 3-x Perovskite quantum dots.
[0031] Obtain BiOCl to present embodiment y Br 1-y Coated CsSnBr x Cl 3-x Perovskite quantum dots for TEM observation, BiOCl y Br 1-y The thickness of the shell layer is 100 nm.
[0032] Obtain BiOCl to present embodiment y Br 1-y Coated CsSnBr x Cl 3-x The quantum efficiency of perovskite quantum dots is 91% after being detected by the fluorometer integrating s...
Embodiment 3
[0034] ZnBr y Cl 2-y Coating (CH 3 NH 3 ) 0.9 Na 0.1 PbBr x Cl 3-x The preparation of perovskite quantum dots comprises the following steps:
[0035] Press (CH 3 NH 3 ) 0.9 Na 0.1 PbBr x Cl 3-x Quantum dots and ZnBr 2 The mass ratio is 1:5, weigh (CH 3 NH 3 ) 0.9 Na 0.1 PbBr x Cl 3-x Quantum dots in a ball mill, adding ZnBr 2 , mixed evenly, the halogen elements in the two are exchanged to a certain extent, and (CH 3 NH 3 ) 0.9 Na 0.1 PbBr x Cl 3-x / ZnBr y Cl 2-y Precursor mixed powder; put this precursor mixed powder into a crucible, and calcined at 400°C for 100h in the argon atmosphere of the tube furnace to obtain ZnBr y Cl 2-y Coating (CH 3 NH 3 ) 0.9 Na 0.1 PbBr x Cl 3-x Perovskite quantum dots.
[0036] To the ZnBr that present embodiment obtains y Cl 2-y Coating (CH 3 NH 3 ) 0.9 Na 0.1 PbBr x Cl 3-x perovskite quantum dots for transmission electron microscopy, ZnBr y Cl 2-y The thickness of the shell layer is 50 nm.
[0037]...
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