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A method for preparing inorganic halogen perovskite fluorescent quantum dots with high yield at room temperature

A fluorescent quantum dot, perovskite technology, applied in chemical instruments and methods, luminescent materials, nano-optics, etc., can solve problems such as increasing cost, reducing material synthesis efficiency, reducing product quality and monodispersity, and achieving simple equipment. , the effect of excellent performance

Active Publication Date: 2017-08-04
NANJING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But because of its harsh preparation requirements, such as high temperature, inert atmosphere environment, etc. increase the cost and reduce the material synthesis efficiency; in addition, there are problems in the large-scale preparation of the hot injection method, which will reduce the quality and monodispersity of the product (L. Protesescu, S. Yakunin, M.I. Bodnarchuk, F. Krieg, R. Caputo, C.H. Hendon, R.X. Yang, A. Walsh, M.V. Kovalenko, Nano Letters 2015, 6, 3692)

Method used

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  • A method for preparing inorganic halogen perovskite fluorescent quantum dots with high yield at room temperature
  • A method for preparing inorganic halogen perovskite fluorescent quantum dots with high yield at room temperature
  • A method for preparing inorganic halogen perovskite fluorescent quantum dots with high yield at room temperature

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Experimental program
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Effect test

Embodiment 1

[0019] (a) Weigh 0.0556g PbCl 2 , 0.0738g PbBr 2 , 0.0269g CsCl, 0.0341g CsBr, (the molar ratio is Cs:Pb:Cl:Br=1:1:1.5:1.5) was dissolved in 10mL of DMF, and 1mL oleic acid and 0.5mL oleylamine were added. Because PbCl 2 It is difficult to dissolve with CsCl, so add 3mL dimethyl sulfoxide (DMSO) to aid in dissolution.

[0020] (b) After stirring and dissolving for 10 min, measure 2 mL of the precursor solution and drop it into 10 mL of toluene at a speed of 0.1 mL / s, and keep stirring at a speed of 1000 rpm. The luminescent quantum dots were formed within 5s. All operations are carried out at normal temperature and pressure without protective gas. Such as figure 1 As shown, the maximum emission wavelength of the prepared luminescent quantum dot is 455nm, the crystal structure is a perovskite structure, the full width at half maximum is 16nm, and the fluorescence quantum efficiency is 37%.

Embodiment 2

[0022] (a) Weigh 0.0371g PbCl 2 , 0.0984g PbBr 2 , 0.018g CsCl, 0.0454g CsBr, (the molar ratio is Cs:Pb:Cl:Br=1:1:1:2) was dissolved in 10mL of DMF, and 1mL oleic acid and 0.5mL oleylamine were added. Because PbCl 2 It is difficult to dissolve with CsCl, so add 3mL dimethyl sulfoxide (DMSO) to aid in dissolution.

[0023] (b) After stirring and dissolving for 10 min, measure 2 mL of the precursor solution and drop it into 10 mL of toluene at a speed of 0.08 mL / s, and keep stirring at a speed of 1000 rpm. The luminescent quantum dots were formed within 5s. All operations are carried out at normal temperature and pressure without protective gas. Such as figure 2 As shown, the maximum emission wavelength of the prepared luminescent quantum dot is 478nm, the crystal structure is a perovskite structure, the full width at half maximum is 18nm, and the fluorescence quantum efficiency is 62%.

Embodiment 3

[0025] (a) Weigh 0.0681g of PbBr 2 , 0.1476g of CsBr, (the molar ratio of Cs:Pb:Br=1:1:3) was dissolved in 10mL of DMF, and 1mL of oleic acid and 0.5mL of oleylamine were added.

[0026] (b) After stirring and dissolving for 10 min, measure 2 mL of the precursor solution and drop it into 10 mL of toluene at a speed of 0.13 mL / s, and keep stirring at a speed of 1000 rpm. Luminescent quantum dots are formed within 1 s. All operations are carried out at normal temperature and pressure without protective gas. Such as image 3 As shown, the maximum emission wavelength of the prepared luminescent quantum dot is 513nm, the crystal structure is a perovskite structure, the full width at half maximum is 20nm, and the fluorescence quantum efficiency is 88%.

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Abstract

The invention discloses a high-yield preparing method for inorganic halogen perovskite fluorescent quantum dots at the room temperature. The fluorescent quantum dots are CsPbX3, wherein X is equal to AxB1-x and is larger than or equal to 0 and smaller than or equal to 1, and A and B are any one of Cl, Br and I. The method comprises the following steps that firstly, lead halide and cesium halide are dissolved into dimethyl formamide, surfactant oleylamine and oleic acid are added, the mixture is stirred until complete dissolution, and a precursor solution is obtained; secondly, the precursor solution is dripped into a poor solvent at the speed of 0.08-0.13 mL / s and stirred evenly at the uniform speed, and the inorganic halogen perovskite fluorescent quantum dots CsPbX3 are obtained. The preparing method is implemented at the room temperature, protection gas is not needed, equipment is simple, mass production can be achieved, and full visible light band shining can be achieved by selecting halogen and adjusting the proportion of halogen. The full width at half maximum of the inorganic halogen perovskite fluorescent quantum dots prepared through the preparing method ranges from 16 nm to 39 nm, the fluorescence quantum efficiency is close to 90%, and the inorganic halogen perovskite fluorescent quantum dots can be stably stored for more than three months, and can be used in the field of solar cells, lasers, light detectors, light-emitting diodes and the like.

Description

technical field [0001] The invention relates to a method for preparing inorganic halogen perovskite fluorescent quantum dots with high yield at room temperature, and belongs to the technical field of optoelectronic material preparation. Background technique [0002] Perovskite semiconductors, especially perovskite organic lead halides (CH 3 NH 3 wxya 3 , X=F, Cl, Br, I) because of its low cost, high efficiency, and adjustable band gap, it has potential application value in solar cells, lasers, photodetectors, light-emitting diodes and other fields (J.Burschka, N . Pellet, S.-J. Moon, R. Humphry-Baker, P. Gao, M.K. Nazeeruddin, M. Gratzel, Nature 2013, 499, 316). In the field of solar cells, the photoelectric conversion efficiency of solar cells based on this material has exceeded 20% in only three years (N.-G. Park, The Journal of Physical Chemistry Letters 2013, 4, 2423). [0003] However, the extreme sensitivity of perovskite organolead halides to air and moisture limi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K11/66B82Y20/00B82Y30/00
CPCB82Y20/00B82Y30/00C09K11/665
Inventor 曾海波李晓明吴晔芮牧晨
Owner NANJING UNIV OF SCI & TECH