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Method for preparing environment-friendly bimetallic perovskite quantum dots

A perovskite and quantum dot technology, applied in chemical instruments and methods, luminescent materials, nanotechnology, etc., can solve the problems that have not yet appeared in the research of organic bimetallic perovskites, and achieve monodispersity and good stability , good crystallinity and uniform shape

Active Publication Date: 2017-12-01
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the current research on bimetallics is mainly concentrated in the field of pure inorganic single crystal perovskites, and the research on organic bimetallic perovskites has not yet appeared.

Method used

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  • Method for preparing environment-friendly bimetallic perovskite quantum dots
  • Method for preparing environment-friendly bimetallic perovskite quantum dots
  • Method for preparing environment-friendly bimetallic perovskite quantum dots

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Step 1: Add 10 mL of hydrobromic acid dropwise to a mixed solution of 10 mL of butylamine and 25 mL of methanol in an ice-water bath, and stir thoroughly. The ice-water bath was removed, and after reacting at room temperature for 2 hours, it was crystallized by rotary steaming at 60°C, and washed three times with diethyl ether, 30 minutes each time. Finally, the product was vacuum-dried at 60°C to obtain a white butylamine bromide product, which was used as a raw material for the following reaction;

[0027] Step 2, reactant 0.1mmol AgBr, 0.1mmol BiBr 3 Mixed with octadecene, first vacuumize the mixed solution, then pass in an inert gas, then vacuumize again, and cycle operation; finally keep warm and dry under vacuum conditions;

[0028] Step 3, inject inert gas, add surfactants 0.5mL oleic acid, 0.5mL oleylamine, and 0 μL HBr into the mixed solution in step 2, continue to keep warm to completely dissolve the reactants, and prepare a metal salt precursor solution;

...

example 2

[0032] Using the same process as in Example 1, the difference is that the amount of HBr in step 3) of Example 1 was changed to 20 μL, and other conditions were kept the same to obtain a product under acidity conditions of 20 μL.

example 3

[0034] Using the same process as in Example 1, the difference is that the amount of HBr in step 3) of Example 1 was changed to 40 μL, and other conditions were kept the same to obtain a product under acidity conditions of 40 μL.

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Abstract

The invention provides a method for preparing environment-friendly bimetallic perovskite quantum dots. The method comprises the following steps: mixing AgBr, BiBr3, a reaction solvent octadecene and surfactants oleic acid and oleylamine under the condition of inert gas shielding until the mixture is completely dissolved; heating the mixed solution to a reaction temperature, then injecting a DMF (Dimethyl Formamide) solution dissolved with brominated butyl amine, starting to react so as to produce a perovskite structure in the system, and gradually forming (C4H9NH3)2AgBiBr6 quantum dots along with the reaction; and finally, carrying out a quenching reaction by using acetone, thereby obtaining the final (C4H9NH3)2AgBiBr6 bimetallic perovskite quantum dots. With the adoption of a thermal injection synthesis method in the invention, the optical property of perovskite is regulated by regulating the acidity in a synthetic environment on the premise of not changing the morphology and crystal structure of the perovskite. The synthetic perovskite quantum dots have excellent dispersion property and stability and uniform morphology and have profound significance on constructing photoelectric devices with tunable bandgaps.

Description

technical field [0001] The invention relates to a technology for preparing an environment-friendly double-metal perovskite quantum dot, and belongs to the technical field of new material preparation. Background technique [0002] With the advent of new perovskite solar cells, perovskite materials have received widespread attention. However, the high cost and toxicity of lead cannot be ignored. Exploring the synthesis of cheap and environmentally friendly perovskites has become an inevitable requirement for research. At present, people have synthesized (CH 3 NH 3 ) 2 MCl 4 (M=Sn, Ge, Cu, Fe, Mn, Cd) type perovskite, but due to the change of energy band gap and relative mass, it also has a certain influence on the photoelectric performance of perovskite. In order to maintain the original performance of perovskite, a double-metal perovskite A 2 B'B"X 6 The conception of which B', B "are monovalent metals and trivalent metals respectively, Cu, Ag, and Au are the most suit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/06C09K11/74B82Y40/00
CPCB82Y40/00C09K11/06C09K11/7428
Inventor 娄永兵牛艳丹
Owner SOUTHEAST UNIV
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