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A kind of metavanadate fluorescent ceramic bulk material and preparation method thereof

A technology of fluorescent ceramics and metavanadate, which is applied in the direction of luminescent materials, chemical instruments and methods, sustainable buildings, etc. It can solve the problems of poor uniformity, inability to prepare sintered ceramics, and difficulty in obtaining pure equivalence

Active Publication Date: 2021-05-25
江苏先进无机材料研究院
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In the traditional solid-state reaction method, because the alkali metal carbonate (potassium carbonate, rubidium carbonate, cesium carbonate) as one of the raw materials absorbs serious moisture in the air, it is difficult to mix the raw materials, the uniformity is poor, and the product is not easy to obtain a pure phase, so The preparation of the next step of sintered ceramics cannot be carried out

Method used

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  • A kind of metavanadate fluorescent ceramic bulk material and preparation method thereof
  • A kind of metavanadate fluorescent ceramic bulk material and preparation method thereof
  • A kind of metavanadate fluorescent ceramic bulk material and preparation method thereof

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[0034] The invention relates to a metavanadate fluorescent ceramic and a preparation method thereof. The ceramics use alkali metal carbonate and vanadium-containing compounds as raw materials, grind a certain proportion of the raw material mixture and / or the metavanadate powder obtained by calcining the raw material mixture, and then preform and press to obtain a green body , sintering at a certain temperature to obtain bulk metavanadate sintered ceramics; or directly hot-press sintering the raw material mixture and / or metavanadate powder to obtain bulk metavanadate sintered ceramics. The obtained sintered ceramics have obvious white light fluorescence characteristics. The ceramics prepared by the method of the invention have high purity, simple method, high yield, and are suitable for large-scale production; the product has high quantum efficiency and light emission bandwidth, and is suitable for magnetron sputtering targets or white light diodes and other light emitting comp...

Embodiment 1

[0054] Step A) Weigh 20.2g cesium carbonate and 9.8g vanadium pentoxide. Dissolve cesium carbonate in 200ml of methanol, ultrasonicate for 30 minutes to promote its dissolution, mix the obtained transparent cesium carbonate methanol solution with vanadium pentoxide, grind and stir until the methanol is completely volatilized. The raw materials were placed in a heating furnace, heated to 400°C, and reacted for 24 hours to obtain white cesium metavanadate powder, which was analyzed by XRD to determine the phase. The results are shown in figure 1 .

[0055] Step B) The powder is transferred to a circular mold with a diameter of 55 mm and dry-pressed under a pressure of 1.5 MPa. The obtained block is put into a balloon and vacuumed, and then the balloon is put into an isostatic press, pressurized at 260 MPa, and kept under pressure for 15 minutes. Get a sintered green body.

[0056] Step C) The green body is wrapped in quartz sand and placed on a corundum plate, and a flat corun...

Embodiment 2

[0063] Step A) Weigh 6.329g of rubidium carbonate and 4.466g of vanadium pentoxide. Dissolve rubidium carbonate in 200ml of methanol, and ultrasonicate for 20-30 minutes to promote its dissolution. Mix rubidium carbonate methanol solution with vanadium pentoxide, grind and stir until the methanol is completely volatilized. The raw materials were placed in a heating furnace, and the temperature was raised to 450°C, and reacted for 24 hours to obtain white rubidium metavanadate powder.

[0064] Step B) The powder is transferred to a circular mold with a diameter of 55mm and dry-pressed under a pressure of 3.0MPa. The obtained block is put into a balloon and vacuumed, and then the balloon is put into an isostatic press, pressurized at 280MPa, and kept under pressure for 15 minutes. Get a sintered green body.

[0065]Step C) The green body is wrapped in quartz sand and placed on a corundum plate, and a flat corundum plate is pressed on top, then transferred to a high-temperature ...

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Abstract

The invention relates to a metavanadate fluorescent ceramic block material and a preparation method thereof. The ceramic block material includes AVO with a mass fraction of 80% to 100%. 3 , wherein, A=Cs, Rb, K, the density of the ceramic bulk material is 2.5~3.5g / cm 3 , The flexural strength is 3~15MPa. The fluorescent ceramic sintered body of the invention has the characteristics of convenient processing, strong plasticity, stable properties, easy packaging and the like, and has strong practicability.

Description

technical field [0001] The invention belongs to the field of novel optical functional materials, and in particular relates to a method for preparing fluorescent ceramics which can be used as a metavanadate sintered body of a white light LED. Background technique [0002] As the fourth-generation lighting source, white light-emitting diode (LED) is regarded as the most promising new-generation lighting technology due to its advantages of high efficiency, energy saving, environmental protection and long life. In addition, due to the advantages of good color reproduction, low power consumption, and long life, the market share of white LEDs in the field of liquid crystal display backlights has grown rapidly in recent years. [0003] In 1993, Nichia took the lead in making a breakthrough in the blue GaN LED technology and quickly industrialized it, and then realized the white LED in 1996. It was put on the market in 1998, which attracted great attention from insiders and outsider...

Claims

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Application Information

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IPC IPC(8): C04B35/495C09K11/69
CPCC04B35/495C04B2235/442C04B2235/6562C04B2235/6567C04B2235/77C04B2235/95C04B2235/9646C09K11/691Y02B20/00
Inventor 金平实徐放孙光耀曹逊李荣
Owner 江苏先进无机材料研究院
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