Preparation method of CsPbBr3 perovskite three-dimensional cube microcavity sample

A technology of cube and perovskite, applied in the field of preparation of nano/micron materials, can solve the problem of unsatisfactory optical field limitation, and achieve the effects of highly controllable morphology and size, high crystal quality, and excellent control performance.

Active Publication Date: 2018-07-13
SHANGHAI INST OF OPTICS & FINE MECHANICS CHINESE ACAD OF SCI
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  • Abstract
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  • Application Information

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Problems solved by technology

However, there are also some problems in the square microcavity. For example, the obtained modes are mostly multimode with group velocity dispersion, and the optical field is not limited enough. Therefore, high-quality perovskite square microcavities have not been obtained so far Single mode laser output

Method used

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  • Preparation method of CsPbBr3 perovskite three-dimensional cube microcavity sample
  • Preparation method of CsPbBr3 perovskite three-dimensional cube microcavity sample
  • Preparation method of CsPbBr3 perovskite three-dimensional cube microcavity sample

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Embodiment 1

[0024] (1) The deposition sheet (10 mm × 15 mm) and the quartz boat (20 mm × 20 mm × 60 mm) were ultrasonically cleaned with deionized water and absolute ethanol for 5 min, and dried in a drying oven for 24 h.

[0025] (2) Weigh CsBr and PbBr according to the molar ratio of 2:1 2 Powder (raw material purity>99.999%), put into the above-mentioned dried quartz boat, both ends as evaporation source.

[0026] (3) One end of the quartz boat filled with CsBr powder is located near the thermocouple in the center of the quartz tube, and one end of the quartz boat filled with PbBr powder 2 One end of the powder faces the air outlet. 3 deposition sheets are placed at the downwind outlet, about 56cm away from the center of the quartz boat, and the distance between each sheet is about 3cm;

[0027] (4) After the evaporation source is placed, close the quartz tube; close the quartz tube, vacuumize for 5 minutes, and pass high-purity nitrogen into the quartz tube to discharge the air in t...

Embodiment 2

[0030] This embodiment mainly examines CsPbBr 3 CsBr and PbBr during the fabrication of perovskite three-dimensional cubic microcavities 2 The effect of evaporation source ratio, deposition sheet type, placement position, reaction temperature, reaction time and carrier gas rate on the morphology and size of the obtained sample. Please refer to Example 1 for specific experimental procedures. The difference is that the proportion of raw materials, type of deposition sheet, placement position, reaction temperature, reaction time and carrier gas rate were changed respectively. The specific experimental parameters are shown in Table 1.

[0031] Table 1 Preparation of the above CsPbBr 3 Experimental conditions of perovskite three-dimensional cube microcavity:

[0032]

[0033] From the experimental results, it can be seen that appropriate changes in the proportion of raw materials, the type of deposition sheet and the reaction time have almost no effect on the morphology of the...

Embodiment 3

[0035] This example investigates the CsPbBr gained in embodiment 1 3 Whether the perovskite three-dimensional cubic microcavity sample can be used as an optical microcavity and gain medium, and further used as a micro laser.

[0036] The experimental equipment is an ultrafast transient spectrometer (model HR Evolution&FLS980). The specific experimental steps are: place the substrate containing the sample horizontally on the sample stage of the microfluorescence spectrometer, adjust the sample stage, and select a single CsPbBr under the microscope 3 Three-dimensional cubic microcavities. The 400 nm femtosecond laser (model Libra-USP-10k-HE) was turned on and the laser light was introduced into the spectrometer. Adjust the microscope lens, focus the light spot to the minimum and ensure that the entire sample is covered, and then perform spectrum detection immediately. The fluorescence spectrum of the sample can be obtained at low power, such as image 3 shown. The single-mod...

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Abstract

The invention discloses a preparation method of a CsPbBr3 perovskite three-dimensional cube microcavity sample. The preparation method comprises weighing CsBr and PbBr2 powders, putting the CsBr and PbBr2 powders in a flat quartz boat, putting the flat quartz boat into a quartz tube of a tube furnace, putting a sedimentary sheet in the quartz tube of the tube furnace and in an air outlet of the quartz tube; raising the temperature of the furnace under the protection of nitrogen to 600 DEG C, and reacting, wherein a yellow sediment on the sedimentary sheet is the CsPbBr3 perovskite three-dimensional cube microcavity sample. The surface of a prepared CsPbBr3 three-dimensional cube perovskite microcavity is smooth, the size of the three-dimensional cube microcavity is 1-15 mum, the size and the height are adjustable, and the preparation method has the excellent characteristics of convenient operation, high repeatability, high crystalline quality, controllable morphological size and height, etc.

Description

technical field [0001] The present invention relates to the preparation of nano / micro materials, especially a kind of all-inorganic perovskite CsPbBr 3 A method for preparing a three-dimensional cubic microcavity. The synthesis process has the characteristics of simple operation and high repeatability, highly controllable sample size / morphology, high crystal purity, and good crystallization. Background technique [0002] Due to their small size and large specific surface area, micro-nano structured materials have characteristics different from conventional materials, showing excellent electrical, optical, and mechanical properties. Semiconductor micro-nanostructure materials have excellent ability to control the light field, and can be used as gain medium and optical microcavity at the same time, which is the basic carrier for studying the interaction between light and matter. Optical microcavity means that the size of the microcavity is as small as the wavelength of light ...

Claims

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Application Information

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IPC IPC(8): C01G21/00C09K11/66H01S5/30
CPCC01G21/006C01P2002/34C01P2004/03C01P2004/38C01P2004/61C09K11/665H01S5/30
Inventor 张龙董红星唐冰周纯
Owner SHANGHAI INST OF OPTICS & FINE MECHANICS CHINESE ACAD OF SCI
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