Chemical solution preparation method for tungsten molybdate solid solution luminescent microcrystal

A technology of tungstomolybdate and chemical solution, which is applied in the field of scheelite structure luminescent materials, to achieve the effect of expanding the application field, low reaction temperature, and good application and promotion prospects

Inactive Publication Date: 2012-05-02
SICHUAN NORMAL UNIVERSITY
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0004] The purpose of the present invention is to provide a new matrix material for preparing scheelite-type composite tungstomolybdate solid

Method used

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  • Chemical solution preparation method for tungsten molybdate solid solution luminescent microcrystal
  • Chemical solution preparation method for tungsten molybdate solid solution luminescent microcrystal
  • Chemical solution preparation method for tungsten molybdate solid solution luminescent microcrystal

Examples

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Example Embodiment

[0041] Example 1: Ca(MoO 4 ) x (WO 4 ) (1-x) Preparation of Solid Solution Luminescent Microcrystals

[0042] According to the preparation of a certain amount of target system Ca(MoO 4 ) x (WO 4 ) (1-x) The molar ratio of various raw materials required for the crystallites, measure the corresponding volume of Ca(NO) with a certain concentration 3 ) 2 The solution was placed in a polytetrafluoroethylene beaker, and then the corresponding amount of Na was added respectively. 2 MoO 4 and Na 2 WO 4 The solution was stirred at room temperature for 5-20 minutes, and then the polytetrafluoroethylene beaker was placed in the autoclave. After hydrothermal reaction at 60-180°C for 15-30 hours, it was naturally cooled to room temperature. The precipitate was centrifuged, washed with deionized water, and dried at 100-150 °C to obtain Ca(MoO 4 ) x (WO 4 ) (1-x) Solid solution luminescent crystallites. The X-ray diffraction pattern of the crystallite is fig...

Example Embodiment

[0044] Example 2: Sr(MoO 4 ) x (WO 4 ) (1-x) Preparation of Solid Solution Luminescent Microcrystals

[0045] In addition to Ca (NO 3 ) 2 Change to Sr (NO 3 ) 2 In addition, the rest are prepared according to the process of Example 1 to prepare Sr(MoO 4 ) x (WO 4 ) (1-x) Series of solid solution crystallites.

[0046] Figure 5 prepared Sr(MoO 4 ) x (WO 4 ) (1-x) X-ray diffraction pattern of crystallites. It shows the formation of pure scheelite structure of Sr(MoO 4 ) x (WO 4 ) (1-x) solid solution. Image 6 The preparation of Sr(MoO 4 ) x (WO 4 ) (1-x) SEM morphology of solid solution crystallites. It can be seen that the microcrystals are spherical particles with uniform particle size and an average size of about 10 μm; and the surface of the microcrystal particles is smooth, which is conducive to coating a uniform, dense and smooth luminescent layer. Figure 7 Sr(MoO is given 4 ) x (WO 4 ) (1-x) Room temperature photoemission...

Example Embodiment

[0047] Example 3: Ba(MoO 4 ) x (WO 4 ) (1-x) Preparation of Solid Solution Luminescent Microcrystals

[0048] In addition to Ca(NO 3 ) 2 Change to Ba(NO 3 ) 2 In addition, the rest are prepared by the process of Example 1 to prepare Ba(MoO 4 ) x (WO 4 ) (1-x) A series of solid solution luminescent crystallites. The X-ray diffraction pattern of the crystallite is Figure 8 It can be seen that the obtained crystallites are all scheelite tetragonal single-phase structures, indicating that they form Ba(MoO 4 ) x (WO 4 ) (1-x) solid solution. Figure 9 The preparation of Ba(MoO 4 ) x (WO 4 ) (1-x) Scanning electron microscope image of crystallites. It can be seen that the morphology of the prepared crystallites is tetragonal or bipyramidal, and a small amount of agglomeration occurs, which can be improved by adding surfactants.

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Abstract

A chemical solution preparation method for a tungsten molybdate solid solution microcrystal is disclosed, which belongs to the field of luminescent material with a scheelite structure, and relates to a research about a novel chemical solution method preparation for a tungsten dimolybdate solid solution luminescent microcrystal host material. The solid solution microcrystal provided by the invention is expressed by a chemical general formula A(WO4)1-x(MoO4)x, wherein A is Ca, Sr or Ba; and x is not less than 0 and not greater than 1. The solid solution luminescent microcrystal of A(MoO4)x(WO4)(1-x) is obtained by adding A(NO3)2 solution, Na2MoO4 solution and Na2WO4 solution in corresponding amounts in a polytetrafluoroethylene beaker respectively according to the molar ratio of each raw material needed to prepare the microcrystal of a target system A(MoO4)x(WO4)(1-x) in a certain amount, stirring for 5 to 20 minutes at a normal temperature, then placing the polytetrafluoroethylene beaker in a high-pressure reactor; performing a hydrothermal reaction for 15 to 30 hours at 60 to 180 DEG C, and naturally cooling to a room temperature; centrifugally separating a precipitate, cleaning the precipitate by deionized water, then drying at 100 to 150 DEG C. The preparation technique disclosed by the invention is simple in equipment and low in reaction temperature; and the prepared luminescent microcrystal is pure in phase, uniform in granularity, controllable in grain size, regular in shape, excellent in luminescent performance, and good in practicability.

Description

technical field [0001] The invention belongs to the field of scheelite structure luminescent materials, and relates to the research of a novel binary tungstomolybdate solid solution luminescent matrix material, in particular to the preparation of the novel tungstomolybdate solid solution microcrystal by a chemical solution method. Background technique [0002] In 1896, calcium tungstate was the first compound used as an X-ray luminescent material, and in 1938, it was used as a blue phosphor to synthesize the first generation of practical fluorescent lamps, creating a history of the application of luminescent materials in lighting sources. Since then, tungstomolybdate as a luminescent material has been extensively studied by scholars at home and abroad, which greatly promotes and satisfies the industrial application of luminescent materials, especially the solid-state lighting source light-emitting diode (LED), which is now attracting much attention. One of the important appl...

Claims

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Application Information

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IPC IPC(8): C09K11/68
Inventor 高道江赖欣秦丹魏艳艳毕剑李阳李林奕赁敦敏
Owner SICHUAN NORMAL UNIVERSITY
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