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A method for growing large-scale zero-dimensional perovskite light-emitting single crystals

A large-size, perovskite technology, applied in the direction of single crystal growth, single crystal growth, crystal growth, etc., can solve the problems of cumbersome operation, serious pollution, and long time consumption, and achieve a wide luminous color gamut, low defect state density, Effect of High Carrier Mobility

Active Publication Date: 2020-11-06
SHANDONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In addition, the preparation and synthesis of Cs 4 PbBr 6 All methods have major disadvantages, such as high cost, serious pollution, cumbersome operation, low yield, long time-consuming, etc.

Method used

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  • A method for growing large-scale zero-dimensional perovskite light-emitting single crystals
  • A method for growing large-scale zero-dimensional perovskite light-emitting single crystals
  • A method for growing large-scale zero-dimensional perovskite light-emitting single crystals

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] Lead cesium bromide and cesium chloride with a molar ratio of 1:1 were mixed and dissolved in DMSO respectively to obtain a mixed solution with a concentration of 0.1 mol / L. After the solution was fully stirred and uniform, the pure solution was sealed and transferred to a crystal growth tank to start growing crystals at 60°C. After spontaneous crystallization, the temperature was raised to 80°C at a rate of 1°C / min, and the crystal growth rate was controlled to about 1mm / day. Finally, a large-size zero-dimensional perovskite light-emitting single crystal with tunable band gap was obtained. for Cs 4 PbCl 1.2 Br 4.8 Single crystal, the size of the single crystal is about 4mm, the width at half maximum is 18nm, and the luminescence peak is 481nm. The physical photo of the single crystal is as follows figure 1 As shown in A. The crystal structure, absorption spectrum, luminescence spectrum and elemental analysis test results of the single crystal are as follows figur...

Embodiment 2

[0047] Lead cesium bromide and cesium bromide with a molar ratio of 1:1 were mixed and dissolved in DMSO respectively, so that the concentration of the mixed solution was 0.1 mol / L. After the solution was fully stirred and uniform, the pure solution was sealed and transferred to a crystal growth tank to start growing crystals at 60°C. After spontaneous crystallization, the temperature was raised to 80°C at 1°C / min, and the crystal growth rate was controlled to 1.5mm / day. Finally, a large-size zero-dimensional perovskite light-emitting single crystal with tunable band gap was obtained. for Cs 4 PbBr 6 Single crystal, the single crystal size is about 4mm, the full width at half maximum is 20nm, and the luminescence peak is 525nm. The real photo of the single crystal is shown in figure 1 Shown in B. The crystal structure, absorption spectrum, luminescence spectrum and elemental analysis test results of the single crystal are as follows figure 2 (Curve B), image 3 B. Fig...

Embodiment 3

[0049] Lead cesium bromide and cesium iodide with a molar ratio of 1:1 were mixed and dissolved in DMSO respectively, so that the concentration of the mixed solution was 0.1 mol / L. After the solution was fully stirred and uniform, the pure solution was sealed and transferred to a crystal growth tank to start growing crystals at 60°C. After spontaneous crystallization, the temperature was raised to 80°C at a rate of 1°C / min, and the crystal growth rate was controlled to about 1mm / day. Finally, a large-size zero-dimensional perovskite light-emitting single crystal with tunable band gap was obtained. for Cs 4 PB 0.3 Br 5.7 Single crystal, the single crystal size is about 4mm, the full width at half maximum is 18nm, and the luminescence peak is 536nm. The real photo of the single crystal is shown in figure 1 C shown. The crystal structure, absorption spectrum, luminescence spectrum and elemental analysis test results of the single crystal are as follows figure 2 (C curve), ...

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Abstract

The invention provides a method for growing a large-size zero-dimensional perovskite light-emitting single crystal. The method comprises the following steps: growing the large-size zero-dimensional perovskite light-emitting single crystal in a cesium-rich growth system by utilizing inverse temperature solubility; the chemical formula of the large-size zero-dimensional perovskite light-emitting single crystal with the tunable band gap is Cs4PbBr<6-m>Xm, wherein the X is a halogen element, and m is the doping number of the halogen element and is any numerical value selected from 0-6. The half-peak width of the luminescence peak of the single crystal is narrow, the luminescence peak position can be regulated and controlled in the range of 481-536 nm, the half-height width is less than 25nm, and the size of the single crystal is large.

Description

technical field [0001] The invention relates to the field of perovskite luminescent material preparation and crystal growth, in particular to a method for growing a large-size zero-dimensional perovskite luminescent single crystal. Background technique [0002] The current liquid crystal display technology mainly adopts the scheme of combining blue light diodes with green light, red light, yellow light and other luminescent materials. In order to truly restore the color of the object in the display and achieve a wider color gamut, this requires red, green, yellow and other fluorescent materials to have high color purity. height width. In fact, in addition to color purity, there is another requirement that is often overlooked but is crucial, that is, the precise peak positions of the three primary colors of red, green, and blue, which are extremely critical for displaying color and the effect of human perception. [0003] Compared with red light and blue light, the percepti...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C30B29/12C30B7/14
CPCC30B7/14C30B29/12
Inventor 丁建旭袁野杜松洁崔洪芝井琳程晓华
Owner SHANDONG UNIV OF SCI & TECH
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