A kind of preparation method of circular cake-shaped europium-doped lanthanum vanadate red fluorescent powder

A technology of red fluorescent powder and lanthanum vanadate, which is applied in chemical instruments and methods, luminescent materials, etc., can solve the problems of lack of control of particle size and shape, difficulty in controlling size and shape, and difficulty in improving quantum efficiency. The effect of controllable morphology and phase structure, excellent application prospects, and easy synthesis process

Active Publication Date: 2016-08-24
惠州市鑫正科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Currently, the preparation of LaVO 4 There are three main types of methods for micro / nanomaterials: one is solid-phase synthesis of crystals with higher crystallinity, but its size and shape are difficult to control, and more energy (raw materials and electricity) is consumed; Liquid-phase synthesis of templates, OH in solution - (NaOH, NH 3 ·H 2 O or urea) to regulate the growth of crystal nuclei, the particle size and morphology of the product still lack control, and it is difficult to improve its quantum efficiency; the third is the hydrothermal or solvent synthesis assisted by template agents (EDTA, SDS, CTAB, etc.) Doped LaVO with regular shapes such as granular, rod, fibrous, and square 4 crystal, the product exhibits better fluorescence efficiency

Method used

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  • A kind of preparation method of circular cake-shaped europium-doped lanthanum vanadate red fluorescent powder
  • A kind of preparation method of circular cake-shaped europium-doped lanthanum vanadate red fluorescent powder
  • A kind of preparation method of circular cake-shaped europium-doped lanthanum vanadate red fluorescent powder

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Embodiment 1

[0036] An embodiment of a method for preparing a round cake-shaped europium-doped lanthanum vanadate red phosphor according to the present invention. The round cake-shaped europium-doped lanthanum vanadate red phosphor described in this embodiment is prepared by the following method:

[0037] a) Weigh 1.98mmol La(NO 3 ) 3 and 0.02mmol Eu(NO 3 ) 3 The mixture was dissolved in 50mL deionized water to obtain a rare earth nitrate solution, then 0.5g PVP was added, dissolved by magnetic stirring, and 2mmol NaVO was gradually added during stirring 3 , and then use 4mol·L -1 The sodium hydroxide solution adjusts the pH value of the solution to obtain a mixed solution after being 10;

[0038] b) magnetically stirring the mixed solution described in step a) for 1 h to obtain a suspension;

[0039] c) Transfer the suspension obtained in step b) to a 100mL stainless steel autoclave lined with polytetrafluoroethylene, add water to 80% of the capacity of the reactor, seal it and place...

Embodiment 2

[0043] An embodiment of a method for preparing a round cake-shaped europium-doped lanthanum vanadate red phosphor according to the present invention. The round cake-shaped europium-doped lanthanum vanadate red phosphor described in this embodiment is prepared by the following method:

[0044] a) Weigh 1.96mmol La(NO 3 ) 3 and 0.04mmol Eu(NO 3 ) 3 The mixture was dissolved in 50mL deionized water to obtain a rare earth nitrate solution, then 0.5g PVP was added, dissolved by magnetic stirring, and 2mmol NH 4 VO 3 , and then use 4mol·L -1 The sodium hydroxide solution adjusts the pH value of the solution to obtain a mixed solution after being 10;

[0045] b) magnetically stirring the mixed solution described in step a) for 1 h to obtain a suspension;

[0046] c) Transfer the suspension obtained in step b) to a 100mL stainless steel autoclave lined with polytetrafluoroethylene, add water to 80% of the capacity of the reactor, seal it and place the reactor in a constant tempe...

Embodiment 3

[0050] An embodiment of a method for preparing a round cake-shaped europium-doped lanthanum vanadate red phosphor according to the present invention. The round cake-shaped europium-doped lanthanum vanadate red phosphor described in this embodiment is prepared by the following method:

[0051] a) Weigh 1.94mmol La(NO 3 ) 3 and 0.06mmol Eu(NO 3 ) 3 The mixture was dissolved in 50mL deionized water to obtain a rare earth nitrate solution, then 0.5g PVP was added, dissolved by magnetic stirring, and 2mmol NH 4 VO 3 , and then use 4mol·L -1 The sodium hydroxide solution adjusts the pH value of the solution to obtain a mixed solution after being 10;

[0052] b) magnetically stirring the mixed solution described in step a) for 1 h to obtain a suspension;

[0053] c) Transfer the suspension obtained in step b) to a 100mL stainless steel autoclave lined with polytetrafluoroethylene, add water to 80% of the capacity of the reactor, seal it and place the reactor in a constant tempe...

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Abstract

The invention discloses a method for preparing a round cake-shaped europium-doped lanthanum vanadate red fluorescent powder. The method selects PVP as a template agent, uses lanthanum nitrate or lanthanum chloride as the lanthanum source, and uses europium nitrate or europium chloride as the lanthanum source. Europium source, using sodium metavanadate or ammonium metavanadate as vanadium source, using hydrothermal reaction method, by changing initial pH, hydrothermal reaction time and temperature, europium source content and PVP content, round cakes with different diameters can be obtained. The europium-doped lanthanum vanadate red phosphor has a diameter of 1~5.5μm and a thickness of 0.1~0.5μm. It has a tetragonal zircon phase structure and good red light emission properties. The method of the invention has simple raw materials and easy operation, the prepared product has high purity and regular particles, and the product particle morphology and phase structure are controllable, and has strong red light emission, and the obtained round cake-shaped europium-doped lanthanum vanadate is obtained Crystals have excellent application prospects in the fields of PDP, LED, photocatalysis and luminescent ceramics.

Description

technical field [0001] The invention relates to the technical field of inorganic fluorescent powder preparation, in particular to a hydrothermal reaction method for preparing round cake-shaped europium-doped lanthanum vanadate red fluorescent powder by using PVP as a template agent. Background technique [0002] The vanadate matrix has strong absorption in the ultraviolet region and effectively transfers energy to the active ions, and can emit the characteristic spectrum of the active ions. It is a typical matrix-sensitized luminescent material. Studying YVO as early as the 1960s 4 and rare earth doped YVO 4 , found that europium-activated yttrium vanadate (YVO 4 : Eu) red radiation new luminescent material can replace non-rare earth red phosphor powder, and the brightness can be increased by 40%. Recent studies have shown that LaVO 4 The phosphor powder of the matrix has stable luminous efficiency under vacuum ultraviolet irradiation, and is a promising large-screen lum...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K11/82
Inventor 刘国聪董辉许石桦周芳礼李伟胜
Owner 惠州市鑫正科技有限公司
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