Synthetic method of non-lead double perovskite nanocrystals

A double perovskite and synthesis method technology, applied in nanotechnology, nano optics, nanotechnology, etc., can solve the problems of no performance report, etc., and achieve the effect of low cost

Inactive Publication Date: 2019-07-12
TIANJIN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, the non-lead perovskite materials currently reported are still concentrated on the combination of monovalent silver and trivalent ions, but there are no good performance reports.

Method used

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  • Synthetic method of non-lead double perovskite nanocrystals
  • Synthetic method of non-lead double perovskite nanocrystals
  • Synthetic method of non-lead double perovskite nanocrystals

Examples

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Embodiment

[0020] Example: Cs 2 NaBiI 6 The synthesis of nanocrystals, the steps are as follows:

[0021] Step 1: Clean two glass bottles, glass bottles A and B respectively, use deionized water, acetone, isopropanol, and deionized water to clean the two glass bottles A and glass bottle B for ten minutes each, and then use a nitrogen gun blow dry, spare;

[0022] Step 2: Mix 0.2 mmol of cesium iodide (CsI), 0.1 mmol of sodium iodide (NaI) and 0.1 mmol of bismuth iodide (BiI 3 ) was poured into glass bottle A; then, 5 mL of N,N-dimethylformamide (DMF) was added to glass bottle A as a solvent for dissolving the reactants, and the resulting solution was a precursor solution;

[0023] Step 3: Add 5mL of isopropanol to the glass bottle B as an anti-solvent; then quickly inject 50uL of the precursor solution prepared in step 2 into the anti-solvent, stir the reaction fully; centrifuge at 6000rpm and take the supernatant , the obtained colorless colloidal solution is the chemical formula Cs...

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Abstract

The invention discloses a synthetic method of non-lead double perovskite nanocrystals. The synthetic method comprises the following steps: taking DMF as a solvent for dissolving cesium iodide, sodiumiodide and bismuth iodide reactants to obtain a precursor solution; using isopropanol as an anti-solvent; and adding the precursor solution into the anti-solvent, and taking a supernate after centrifugalization to obtain a cubic type nanocrystal material, of which the chemical formula is Cs2NaBiI6 and the exciton peak is 509nm. The Cs2NaBiI6 perovskite nanocrystals are synthesized for the first time. The precursor solution is injected to the anti-solvent capable of being intersoluble by selecting elements which are relatively high in abundance and small in toxicity in earthcrust and adopting aprinciple of an LARP method which is relatively simple in process and relatively low in demand of experimental environment. The precursor substance separates out crystals. The materials used in synthesis are rich in resource and low in cost, and can be produced on a large scale. The prepared nanocrystal light-emitting material has a perovskite structure and an adjustable light-emitting range, sothat the nanocrystals become a low cost quantum dot light-emitting material with a development potential.

Description

technical field [0001] The invention relates to the field of preparation of photoelectric materials and thin-film solar cells, and more specifically relates to the synthesis of a non-lead double perovskite nanocrystal. Background technique [0002] Lead-containing perovskite nanocrystal CsPbX3 (X = Cl, Br, I) has the advantages of large light absorption coefficient, high luminescence quantum yield, and easy adjustment of band gap, and is widely used in light-emitting diodes (LEDs), nanolasers, solar cells and In related research on photodetectors, etc. [0003] However, lead halide perovskite materials are not conducive to large-scale use and promotion due to the presence of lead. At present, some non-lead perovskites have been reported. The current non-lead perovskites have also made some progress, such as halogen adjustable, luminescent Tunable and extremely stable compared to lead halide perovskite quantum dots. [0004] However, the currently reported lead-free perovsk...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/74B82Y20/00B82Y40/00
CPCC09K11/7435B82Y20/00B82Y40/00
Inventor 赵广久王朝刘越马淋淋周晨阳王傲成
Owner TIANJIN UNIV
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