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Low-temperature rapid preparation method of perovskite luminescent material formamidine lead bromide nanocrystals

A technology of luminescent materials and nanocrystals, which is applied in luminescent materials, chemical instruments and methods, nanotechnology, etc., can solve the problems of low preparation efficiency, difficulty in realizing and stably maintaining photoluminescence, and restrictions on mass production of FAPbBr, achieving synthesis The effect of short time and high synthesis efficiency

Active Publication Date: 2019-11-19
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, CsPbBr 3 It is difficult to achieve and stably maintain "530-535nm" photoluminescence in solid state and polymer embedding state
[0005] Currently synthesized nanocrystalline FAPbBr 3 Generally, the hot injection method is used, which requires high temperature conditions and a nitrogen environment, and the preparation efficiency is low, which limits the FAPbBr 3 mass production

Method used

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  • Low-temperature rapid preparation method of perovskite luminescent material formamidine lead bromide nanocrystals
  • Low-temperature rapid preparation method of perovskite luminescent material formamidine lead bromide nanocrystals

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Embodiment 1

[0019] In this embodiment, a perovskite luminescent material formamidine lead bromide FAPbBr 3 The low-temperature rapid preparation method of nanocrystals comprises the following steps:

[0020] a. FAPbBr 3 Preparation of the original solution of nanocrystals: using 1-octadecene (ODE), oleic acid (OA), oleylamine bromide (OAmBr), PbO, and formamidine acetate (FA-oleate) as raw materials, according to the set formula Weigh the above raw materials and stir and mix evenly, that is, take a 25ml beaker, add 10ml of ODE, 1.5ml of OA, and then weigh 0.3mmol of 105mg of OAmBr, 0.2mmol of 44.6mg of PbO and 0.4mmol of 41.6mg of FA-oleate, then pour the weighed materials into a beaker, mix them together, and place the ultrasonic probe of VCX800 ultrasonic cell disruption in the solution in the above beaker, set the working time for 5 minutes, and mix evenly , to make the raw material mixture, that is to complete FAPbBr 3 Preparation of the original solution of nanocrystals;

[0021]...

Embodiment 2

[0028] This embodiment is basically the same as Embodiment 1, especially in that:

[0029] In this embodiment, a perovskite luminescent material formamidine lead bromide FAPbBr 3 The low-temperature rapid preparation method of nanocrystals comprises the following steps:

[0030] a. FAPbBr 3Preparation of the original solution of nanocrystals: using 1-octadecene (ODE), oleic acid (OA), oleylamine bromide (OAmBr), PbO, and formamidine acetate (FA-oleate) as raw materials, according to the set formula Weigh the above raw materials and mix them evenly, that is, take a 25ml beaker, add 9.5ml of ODE, 1.9ml of OA, and then weigh 0.3mmol of 105mg of OAmBr, 0.2mmol of 44.6mg of PbO and 0.4mmol of 41.6mg of FA-oleate, then pour the weighed materials into a beaker, mix them together, and place the ultrasonic probe of VCX800 ultrasonic cell disruption in the solution in the above beaker, set the working time for 10 minutes, and stir evenly Mix to make raw material mixture, that is to c...

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Abstract

The invention discloses a low-temperature fast preparation method of a perovskite luminous material of formamidine lead bromide nanometer crystals. According to the method, firstly, the raw materials required for preparation are poured into a flask, an ultrasonic cell disruptor is used for stirring the solution for making the materials into a nanometer crystal raw solution; then, acetonitrile and toluene are added; centrifugation is performed; supernatant fluid is removed; precipitates obtained after the centrifugation treatment are taken; then, the toluene is added into the precipitates so that the precipitates are dissolved; then, centrifugation is performed; supernatant fluid is removed; the precipitates obtained after the centrifugation treatment are taken; the FAPbX3 green light nanometer crystals are finally obtained. The FAPbX3 nanometer crystals prepared by using the process provided by the invention can realize stable photoluminescence being 530 to 535 nm; no inert gas and no high-temperature reaction condition are needed in the preparation process; the simple, efficient, low-temperature and great-batch production of the perovskite luminous material can be realized; the quantum yield reaches 80 percent or higher.

Description

technical field [0001] The invention relates to a preparation method of a perovskite material, in particular to a preparation method of a lead halide photoelectric material with a perovskite crystal structure, which is applied in the technical field of semiconductor material preparation technology. Background technique [0002] In the past few years, optoelectronic materials based on lead halide semiconductors with perovskite crystal structure have become a research hotspot. At present, the conversion efficiency of perovskite solar cells has exceeded 22%, and the external quantum dot efficiency (EQE) of perovskite light-emitting diodes (LEDs) has reached 12%. [0003] Compared with the more mature methyl ammonium lead bromide (MAPbBr 3 ), cesium lead bromide (CsPbBr 3 ) preparation method, FAPbBr 3 There are relatively few preparation methods at present. In organic-inorganic hybrid perovskites, FAPbBr 3 Compared to MAPbBr 3 With longer carrier lifetime and diffusion le...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C257/12B82Y20/00B82Y40/00C01G21/00C09K11/06C09K11/66
CPCB82Y20/00B82Y40/00C01G21/006C07C257/12C09K11/06C09K11/664
Inventor 杨绪勇王浩然李晓敏
Owner SHANGHAI UNIV
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