Preparation method of degradable polymer wrapped critical-state all-inorganic perovskite quantum dots
A technology for degrading polymers and quantum dots, applied in chemical instruments and methods, luminescent materials, nanotechnology, etc. The effect of stability and long storage time
Pending Publication Date: 2022-07-01
SHIJIAZHUANG TIEDAO UNIV
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Problems solved by technology
The all-inorganic perovskite quantum dots CsPbBr 3 Very poor stability in water or acid environment
This results in an all-inorganic perovskite quantum dot CsPbBr 3 The technology of coating with chitosan is very difficult
This is also the "chitosan-coated CsPbBr" that has not been seen so far. 3 The reason for the related reports
Method used
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Embodiment 1
[0038] This embodiment provides a surface-coated CsPbBr 3 / Cs 4 PbBr 6 The preparation method of quantum dots is as follows:
[0039] 1. Preparation of zero-dimensional Cs using hot injection method 4 PbBr 6 Quantum dots, the steps include:
[0040] (1) 0.1 mmol of PbBr 2 Dissolve in 0.5 mL of 1-octadecene (ODE), and add 1 mL of oleic acid (OA) and 1.5 mL of oleylamine (OAm), and mix at 120 °C with stirring until PbBr 2 Completely dissolved to obtain a precursor solution.
[0041] (2) 0.16 g of Cs 2 CO 3 Disperse in 1 mL of oleic acid and 16 mL of 1-octadecene, mix at 120 °C with stirring until Cs 2 CO 3 Completely dissolved to obtain cesium oleate (Cs-OL).
[0042] (3) Inject all the prepared cesium oleate into the precursor solution. After a few seconds, the reaction turns cloudy white, and continue to wait for a few seconds.
[0043] (4) Cool down to room temperature with a cold water bath, then centrifuge at 6000 rpm for 15 minutes, discard the supernatant, and...
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Abstract
The invention relates to a preparation method of a degradable polymer-coated critical-state all-inorganic perovskite quantum dot, which comprises the following steps of: performing interface conversion on zero-dimensional perovskite through a water triggering method to form a critical-state perovskite quantum dot, and performing surface coating on a product generated by water triggering by adopting a degradable polymer material at the same time to obtain the degradable polymer-coated critical-state all-inorganic perovskite quantum dot. The contact between the perovskite quantum dots and the external environment (air, water, ethanol and the like) is effectively blocked, and a degradable polymer wrapped critical state all-inorganic perovskite quantum dot product is obtained. According to the method disclosed by the invention, the zero-dimensional perovskite quantum dots are combined with a surface coating technology of the quantum dots to generate the critical-state full-inorganic perovskite quantum dots through a water triggering method, so that in a long-time storage process of the coated critical-state perovskite quantum dots, as time goes on, the inside of a coating object is continuously changed, and the critical-state full-inorganic perovskite quantum dots are formed. Therefore, the product has the characteristic of sustainable luminescence, so that the water resistance and the light stability of the target product are improved, and the storage time is prolonged.
Description
technical field [0001] The invention relates to the technical field of preparation of quantum dots stably dispersed polar solutions, in particular to a preparation method of degradable polymer-wrapped critical state all-inorganic perovskite quantum dots. Background technique [0002] Organometallic halide perovskites (ABX 3 ) materials have excellent photophysical properties, such as high photoluminescence quantum yields, narrow emission widths, and tunable band gaps covering the full visible light range, but poor water stability limits their applications. For the water stability of perovskite quantum dots, researchers have adopted a variety of strategies to improve the water stability, including the following strategies: (1) Doping other ions or functional groups in the perovskite structure to enhance the perovskite structure Stability; (2) Perovskite single particle surface modification, through the modification layer to improve the perovskite surface stability, improve t...
Claims
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Patent Timeline
Login to View More IPC IPC(8): C09K11/66C09K11/02B82Y20/00B82Y40/00
CPCC09K11/665C09K11/025B82Y20/00B82Y40/00
Inventor 赵晋津贺彩丽卜晖
Owner SHIJIAZHUANG TIEDAO UNIV