Preparation method of two-dimensional perovskite single crystal with high luminous purity

A perovskite and purity technology, applied in the field of preparation of two-dimensional perovskite single crystals, can solve the problems of reduced component purity and insignificant effect, and achieve the effects of improving luminescence purity, improving luminescence purity, and avoiding accumulation.

Inactive Publication Date: 2020-12-11
ZHENGZHOU UNIVERSITY OF LIGHT INDUSTRY
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Problems solved by technology

The results show that the effect of controlling the cooling rate is not obvious. Although the intensity of the luminous peak inside the crystal is reduced, it will not disappear completely.
The annealing treatment can rearrange the cations, eliminate the cation accumulation effect and the double luminescence phenomenon, but the high temperature in the annealing process will cause the migration of the halide ions, resulting in the decomposition of the perovskite material, which will reduce the purity of the material.

Method used

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  • Preparation method of two-dimensional perovskite single crystal with high luminous purity
  • Preparation method of two-dimensional perovskite single crystal with high luminous purity
  • Preparation method of two-dimensional perovskite single crystal with high luminous purity

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Experimental program
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Effect test

Embodiment 1

[0024] The preparation method of the two-dimensional perovskite single crystal with high luminous purity in this embodiment is as follows:

[0025] (1) Dissolve 2.232 g of lead oxide (PbO) into 10 ml of hydroiodic acid (HI) and 1.7 ml of hypophosphorous acid (H 3 PO 2 ) in the mixed solution, heated to 100°C to obtain a transparent solution, and kept warm in a constant temperature water tank.

[0026] (2) Slowly add 0.924 ml of n-butylamine to 5 ml of hydroiodic acid solution to obtain a transparent solution.

[0027] (3) Slowly add the transparent solution of step (2) into the solution of step (1) under magnetic stirring to obtain a transparent orange-yellow precursor solution.

[0028] (4) Quickly transfer the perovskite precursor solution with a volume of 2.5, 5, 10, 15 and 20 ml in step (3) into the inner tank of the hydrothermal kettle preheated at 80 °C, and close the hydrothermal tank in time. kettle. The filling degrees of the above-mentioned 5 parts of solutions i...

Embodiment 2

[0041] A method for preparing a two-dimensional perovskite single crystal with high luminescence purity, the steps are as follows:

[0042] (1) Dissolve lead oxide in a mixture of hydroiodic acid and hypophosphorous acid (the volume ratio of hydroiodic acid and hypophosphorous acid is 10:1.7), heat to 100°C to obtain a transparent solution A, and keep it warm in a constant temperature water tank , the concentration of solution A is 0.9 mol / L;

[0043] (2) Slowly add n-butylamine into the hydroiodic acid solution to obtain a transparent solution B, the concentration of which is 1.5 mol / L;

[0044] (3) Slowly add solution B of step (2) to solution A of step (1) under magnetic stirring to obtain a transparent orange precursor solution, and the volume ratio of solution B to solution A is 1:1.67;

[0045] (4) Quickly transfer the precursor solution in step (3) into the liner of the hydrothermal kettle preheated at 80°C, and close the hydrothermal kettle in time. The filling degree...

Embodiment 3

[0047] A method for preparing a two-dimensional perovskite single crystal with high luminescence purity, the steps are as follows:

[0048] (1) Dissolve lead oxide in a mixture of hydroiodic acid and hypophosphorous acid (the volume ratio of hydroiodic acid and hypophosphorous acid is 10:1.7), heat to 100°C to obtain a transparent solution A, and keep it warm in a constant temperature water tank , the concentration of solution A is 0.8 mol / L;

[0049] (2) Slowly add n-butylamine into the hydroiodic acid solution to obtain a transparent solution B, the concentration of which is 2.5 mol / L;

[0050] (3) Slowly add solution B in step (2) to solution A in step (1) under magnetic stirring to obtain a transparent orange-yellow precursor solution. The volume ratio of solution B to solution A is 1: 3.12;

[0051] (4) Quickly transfer the precursor solution in step (3) into the liner of the hydrothermal kettle preheated at 80°C, and close the hydrothermal kettle in time. The filling de...

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Abstract

The invention discloses a preparation method of a two-dimensional perovskite single crystal with high luminescence purity. A hydrothermal technology is introduced into a solution cooling method to prepare a (BA) 2PbI4 single crystal. As the temperature in the hydrothermal kettle is uniform, the temperature difference between the inside and the outside of the crystal can be eliminated; in the growth process of the (BA) 2PbI4 single crystal, BA organic cations tend to be arranged in order due to the fact that the BA 2PbI4 single crystal bears gas pressure, accumulation of the cations is avoided,and thus the double photoluminescence phenomenon of the two-dimensional (BA) 2PbI4 single crystal is eliminated, and the luminescence purity of the two-dimensional (BA) 2PbI4 single crystal is improved. The (BA) 2PbI4 crystal prepared by adopting a hydrothermal auxiliary solution cooling method is a lamellar lamellar single crystal. The structure of the [PbI6] 4-octahedron is an orthogonal crystal structure. Compared with a (BA) 2PbI4 crystal prepared by a solution cooling method in the prior art, the luminescence purity of the sample prepared by the method is obviously improved.

Description

technical field [0001] The invention belongs to the technical field of luminescent materials, and in particular relates to a method for preparing a two-dimensional perovskite single crystal with high luminous purity. Background technique [0002] Organic-inorganic hybrid two-dimensional metal halide perovskite materials have broad application prospects in the field of light-emitting devices due to their superior properties such as adjustable band gap and high stability, and are a rising star in the field of light-emitting materials. A material with a single luminescence peak and a narrower half width of the luminescence peak has a higher luminescence purity. Improving the preparation method of luminescent materials and improving the luminescent purity of two-dimensional perovskite materials is an important way to realize high-performance light-emitting devices, and is an important measure to promote the application of new display technologies and industrial development. [...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C30B7/10C30B29/54C09K11/06
CPCC09K11/06C30B7/10C30B29/54
Inventor 王海燕李森张晓冬杨坤李子炯张志峰王伶俐
Owner ZHENGZHOU UNIVERSITY OF LIGHT INDUSTRY
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