CsPb2Br5 nanosheet and preparation method thereof

A nanosheet, dilute solution technology, applied in chemical instruments and methods, lead compounds, inorganic chemistry, etc., can solve the problem of no nanosheet structure, and achieve the effects of uniform size, uniform crystal phase and high yield

Inactive Publication Date: 2016-11-02
CHONGQING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Journal of the American Chemical Society reported on CsPbX in 2015 3 (X=Cl,, Br, Cl) nanosheet structure preparation method (J.Am.Chem.Soc.2015,137,16008-16011), but so far, there is still no information on CsPb 2 Br 5 Preparation method of nanosheet structure

Method used

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  • CsPb2Br5 nanosheet and preparation method thereof
  • CsPb2Br5 nanosheet and preparation method thereof
  • CsPb2Br5 nanosheet and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Embodiment 1, CsPb 2 Br 5 Preparation of nanosheets

[0027] (1) 100mg Cs 2 CO 3 Dissolve in 3.75ml octadecene solution, then add 0.42ml oleic acid to the solution, heat at 120°C for 60min under nitrogen atmosphere, Cs 2 CO 3 Complete reaction with oleic acid to obtain cesium oleate precursor;

[0028] (2) 69mg PbBr 2 Add 5ml of octadecene solution, heat to 120°C under nitrogen, keep for 60min, raise the temperature to 135°C, inject 0.3ml of oleylamine and 0.4ml of oleic acid, to PbBr 2 Completely dissolve, then inject 0.6ml of cesium oleate precursor, and heat for 60min under nitrogen;

[0029] (3) take out reaction solution, make reaction stop completely by ice bath;

[0030] (4) Centrifuge the reaction solution at 8000rpm / s for 5min, take the precipitate, and then centrifuge and wash it three times with toluene solution. save.

Embodiment 2

[0031] Example 2, CsPb 2 Br 5 Preparation of nanosheets

[0032] (1) 100mg Cs 2 CO 3 Dissolve in 4ml octadecene solution, then add 0.47ml oleic acid to the solution, heat at 110°C for 45min under nitrogen atmosphere, Cs 2 CO 3 Complete reaction with oleic acid to obtain cesium oleate precursor;

[0033] (2) 60mg PbBr 2 Add 5ml of octadecene solution, heat to 120°C under nitrogen, keep for 60min, raise the temperature to 138°C, inject 0.3ml of oleylamine and 0.35ml of oleic acid, to PbBr 2 Completely dissolve, then inject 0.39ml of cesium oleate precursor, and heat for 90min under nitrogen;

[0034] (3) take out reaction solution, make reaction stop completely by ice bath;

[0035] (4) centrifuge the reaction solution at 8000rpm / s for 5min, take the precipitate, then centrifuge and wash it three times with n-hexane solution. stored in alkanes.

Embodiment 3

[0036] Example 3, CsPb 2 Br 5 Preparation of nanosheets

[0037] (1) 100mg Cs 2 CO 3 Dissolve in 3.7ml octadecene solution, then add 0.39ml oleic acid to the solution, heat at 135°C for 30min under nitrogen atmosphere, Cs 2 CO 3 Complete reaction with oleic acid to obtain cesium oleate precursor;

[0038] (2) 70mg PbBr 2 Add 5ml of octadecene solution, heat to 120°C under nitrogen, keep it for 60min, raise the temperature to 140°C, inject 0.3ml of oleylamine and 0.3ml of oleic acid into PbBr 2 Dissolve completely, then inject 0.5ml of cesium oleate precursor, and heat for 120min under nitrogen;

[0039] (3) take out reaction solution, make reaction stop completely by ice bath;

[0040](4) The reaction solution is centrifuged at 8000rpm / s for 5min, and the precipitate is taken, and then centrifuged and washed three times with isopropanol solution. Store in isopropanol.

[0041] The resulting CsPb 2 Br 5 The fluorescence spectra and UV-visible absorption spectra of t...

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Abstract

The invention discloses a preparation method of a CsPb2Br5 nanosheet. The method comprises the following steps: adding excess oleic acid into an octadecylene solution containing Cs2CO3, heating to complete reaction of the Cs2CO3 under the protection of nitrogen to obtain a cesium oleate precursor solution; adding PbBr2 into the eighteen octadecylene solution, heating the solution to the oxygen content of 0 under the protection of nitrogen, heating again, adding oleylamine and oleic acid until complete dissolution of PbBr2, injecting the cesium oleate precursor solution, heating for 60-120 min under the condition of nitrogen, and finally reducing the reaction temperature of the reaction liquid to complete termination; and centrifuging and purifying the organic solution, and storing in organic solution. The prepared CsPb2Br5 nanosheet has homogeneous phase, good crystal structure, good uniformity, high yield, high fluorescence efficiency and stable structure, can be used in industrial production, and has potential application value in solar cells, light emitting diodes (QLED) and microlaser.

Description

technical field [0001] The invention belongs to the technical field of semiconductor luminescent materials, and relates to the shape control and preparation method of inorganic halide perovskite two-dimensional materials, in particular to CsPb 2 Br 5 The structure and preparation method of nanosheets. Background technique [0002] Inorganic halide perovskite nanomaterials are a new type of inorganic functional materials, which have broad application prospects in the fields of solar cells, light-emitting diodes and micro-lasers due to their excellent optical and electrical properties. In recent years, inorganic halide perovskite nanomaterials have attracted more and more scholars' interest, especially the research on new two-dimensional material nanosheets. Because of its excellent two-dimensional structure and luminescent properties, nanosheets have good application value in the field of photodetectors and micro-lasers. Journal of the American Chemical Society reported on...

Claims

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Application Information

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IPC IPC(8): C01G21/00
CPCC01G21/006C01P2002/72C01P2002/84C01P2004/03C01P2004/04
Inventor 唐孝生胡智萍邵海兵臧志刚
Owner CHONGQING UNIV
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