Hydrothermal preparation method of chromium-doped aluminum oxide photoluminescence material

A technology of photoluminescent materials, alumina, applied in luminescent materials, chemical instruments and methods, nanotechnology for materials and surface science, etc., can solve the problem of inability to precisely control the doping ratio, high energy consumption, and long reaction time and other problems, to achieve the effect of being conducive to popularization and application, reducing sintering temperature and shortening reaction time

Active Publication Date: 2018-09-21
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to provide a hydrothermal preparation method of chromium-doped alumina photoluminescent material, which is used to solve the problems of inability to accurately control the doping ratio, long reaction time and high energy consumption in the existing photoluminescent material preparation method. Defects: The present invention adopts hydrothermal method to prepare chromium-doped alumina photoluminescent material, the process is simple and more energy-saving and efficient

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  • Hydrothermal preparation method of chromium-doped aluminum oxide photoluminescence material
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  • Hydrothermal preparation method of chromium-doped aluminum oxide photoluminescence material

Examples

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Embodiment 1

[0030] Adjust the temperature of the water bath to 40°C, dissolve aluminum chloride (5.3336g) in 35mL of 5mol / L KOH solution, and stir for 30min to form a uniform aluminum precursor solution; dissolve chromium chloride (0.0192g) in 35mL of 5mol / L KOH solution, stirred for 30min, then slowly added to the aluminum precursor solution; after continuing to stir for 30min, put it into a stainless steel reaction kettle with a Teflon liner, heated to 280°C water Thermally react for 6 hours, and cool down to room temperature naturally; filter the prepared powder, wash with water until neutral, and dry it at 80°C to obtain chromium-doped alumina powder.

[0031] The PL spectrum of the prepared chromium-doped alumina nanopowder is tested by a spectrophotometer, and it can be seen that there is an obvious absorption peak at 410nm in the excitation spectrum; the emission wavelength in the emission spectrum is 692nm.

Embodiment 2

[0033] The temperature of the hydrothermal reaction in Example 1 was adjusted to 240° C., and the process flow and other process parameters remained unchanged, and the chromium-doped alumina powder was prepared.

[0034] The PL spectrum of the prepared chromium-doped alumina nanopowder was tested by a spectrophotometer, and it can be seen that there are obvious absorption peaks at 410nm and 558nm of the excitation spectrum. In the emission spectrum, the emission wavelength is 693nm.

Embodiment 3

[0036] The hydrothermal reaction temperature in Example 1 was adjusted to 220° C., the process flow and other process parameters remained unchanged, and chromium-doped alumina powder was prepared.

[0037] The PL spectrum of the prepared chromium-doped alumina nanopowder was tested by a spectrophotometer, and it can be seen that there are obvious absorption peaks at 410nm and 560nm of the excitation spectrum. In the emission spectrum, the emission wavelengths are 692.9 nm and 694.3 nm.

[0038]Compared with the photoluminescent material prepared by the traditional preparation method, the chromium-doped alumina photoluminescent material prepared by the preparation method of the present invention has higher luminous intensity, but the synthesis temperature is greatly reduced, and the method is simple and easy to synthesize. The product has high purity and good uniformity; and the inventive method has a wide application range, and also has the advantages of simple process, low si...

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Abstract

The invention belongs to the technical field of preparation of fluorescence light-harvesting solar photovoltaic device photoluminescence materials, and provides a hydrothermal preparation method of achromium-doped aluminum oxide photoluminescence material for solving the problems that an existing preparation method of the photoluminescence material cannot precisely control the doping ratio and islong in reaction time and high in energy consumption. The method comprises the steps that firstly, an aluminum source and a chromium source are dispersed into a KOH solution and stirred to obtain a solution A and a solution B; then, under the constant temperature environment of 30-40 DEG C, the solution B is added into the solution A, and stirring is performed to obtain a mixing solution; the mixing solution is put into a reaction kettle, the temperature is heated to 200-280 DEG C, and the hydrothermal reaction is performed for 0.5-6 h; finally, filtration, washing and drying are performed toobtain chromium-doped aluminum oxide powder. The preparation technology is simple, the sintering temperature is low, energy consumption is low, the yield is high, and the chromium doping proportion can be accurately controlled; the crystallinity of the obtained chromium-doped aluminum oxide photoluminescence material is good, the product purity is high, the particle size is small, the uniformityis good, and synthesis temperature is greatly lowered.

Description

technical field [0001] The invention belongs to the technical field of preparation of photoluminescent materials for fluorescent light-collecting solar photovoltaic devices, and in particular relates to a hydrothermal preparation method of chromium-doped alumina photoluminescent materials. Background technique [0002] As a technology that can effectively reduce the cost of photovoltaic systems and is suitable for building-integrated photovoltaics, fluorescent light-collecting solar photovoltaic devices have attracted much attention in recent years. The concept of fluorescent light-collecting solar photovoltaic devices was first proposed by Weber and Lambe in 1976, and then researchers reported a series of work on LSC in the last century; in recent years, with the development of various new fluorescent materials and the introduction of new , the efficiency of LSC has been greatly improved. Fluorescent light-collecting solar photovoltaic devices are composed of fluorescent m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/68B82Y20/00B82Y30/00
CPCB82Y20/00B82Y30/00C09K11/681
Inventor 向勇刘帅朱焱麟
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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