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Preparation method of rare earth molybdate matrix red nanophosphor

A nano-phosphor, molybdate technology, applied in chemical instruments and methods, luminescent materials, etc., to achieve uniform particles, good reproducibility, and stable quality.

Inactive Publication Date: 2013-09-04
SHENYANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Currently, there is no report on the solvothermal synthesis of nanoscale molybdate-based red phosphors

Method used

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  • Preparation method of rare earth molybdate matrix red nanophosphor
  • Preparation method of rare earth molybdate matrix red nanophosphor
  • Preparation method of rare earth molybdate matrix red nanophosphor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] (1) reacting lanthanum nitrate and europium nitrate with stearic acid to generate a stearate precursor of rare earth ions, the molar fraction of europium ions in the precursor being 10% of the total rare earth ions;

[0022] (2) 2 milliliters of oleic acid and 2 milliliters of oleylamine are stirred and dissolved in isopropanol solvent, and then the rare earth stearate precursor with a total mole number of 0.50 mmol is added, stirred and dissolved to obtain the rare earth stearate precursor solid isopropanol solution;

[0023] (3) 0.75 mmol of sodium molybdate was dissolved in water, then slowly added dropwise to the isopropanol solution in which 1.5 mmol of tetraoctyl ammonium bromide was dissolved, stirred and reacted for 10 minutes to obtain the isopropanol solution of sodium molybdate solution;

[0024] (4) Mix the isopropanol solution of the rare earth stearate precursor with the isopropanol solution of sodium molybdate, transfer it to the reaction kettle, seal it...

Embodiment 2

[0027] (1) reacting lanthanum nitrate and europium nitrate with stearic acid to generate a stearate precursor of rare earth ions, the molar fraction of europium ions in the precursor being 10% of the total rare earth ions;

[0028] (2) 2 milliliters of oleic acid and 2 milliliters of oleylamine are stirred and dissolved in isopropanol solvent, and then the rare earth stearate precursor with a total mole number of 0.50 mmol is added, stirred and dissolved to obtain the rare earth stearate precursor solid isopropanol solution;

[0029] (3) 0.75 mmol of sodium molybdate was dissolved in water, then slowly added dropwise to the isopropanol solution in which 1.5 mmol of tetraoctyl ammonium bromide was dissolved, stirred and reacted for 10 minutes to obtain the isopropanol solution of sodium molybdate solution;

[0030] (4) Mix the isopropanol solution of the rare earth stearate precursor with the isopropanol solution of sodium molybdate, transfer it to the reaction kettle, sea...

Embodiment 3

[0032] (1) reacting yttrium nitrate and europium nitrate with stearic acid to generate a stearate precursor of rare earth ions, the molar fraction of europium ions in the precursor being 5% of the total rare earth ions;

[0033] (2) 2 milliliters of oleic acid and 2 milliliters of oleylamine were stirred and dissolved in isopropanol solvent, then added the rare earth stearate precursor with a total mole number of 1.0 mmol, stirred and dissolved to obtain the rare earth stearate precursor solid isopropanol solution;

[0034] (3) 0.75 mmol of sodium molybdate was dissolved in water, then slowly added dropwise to the isopropanol solution in which 1.5 mmol of tetraoctyl ammonium bromide was dissolved, stirred and reacted for 10 minutes to obtain the isopropanol solution of sodium molybdate solution;

[0035] (4) Mix the isopropanol solution of the rare earth stearate precursor with the isopropanol solution of sodium molybdate, transfer it to the reaction kettle, seal it, and heat...

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Abstract

The invention relates to a preparation method of a phosphor, and concretely relates to a preparation method of a rare earth molybdate matrix red nanophosphor. The method comprises the following steps: reacting lanthanum nitrate or yttrium nitrate or gadolinium nitrate and europium nitrate with stearic acid to generate rare earth ion stearate, and adding a rare earth stearate precursor, stirring for dissolving to obtain an isopropanol solution of the rare earth stearate precursor; dissolving sodium molybdate in water, slowly adding an isopropanol solution of tetraoctylammonium bromide in a dropwise manner, and stirring; and mixing the isopropanol solution of the rare earth stearate precursor with the isopropanol solution of sodium molybdate, transferring the obtained mixed solution to a reaction vessel, closing, cooling to room temperature, adding excess ethanol, centrifuging, collecting products at the bottom of a centrifuge tube, washing with ethanol, n-hexane and water to obtain the rare earth molybdate matrix red nanophosphor. The method can effectively control the morphology and the particle size of the molybdate matrix red nanophosphor, and allows the prepared rare earth molybdate matrix red nanophosphor to have the advantages of uniform sphere, small and uniform particles, nanometer level reaching, good dispersibility and large luminescent intensity, and satisfy white light LED red phosphor needs.

Description

technical field [0001] The invention relates to a preparation method of fluorescent powder, in particular to a preparation method of rare earth molybdate matrix red nano fluorescent powder. Background technique [0002] White LED has the advantages of energy saving, small size, long life and no pollution, and has become a new type of solid-state lighting source. The most ideal way to realize white light LED is to organically combine near-ultraviolet LED chips with light emitters that can be effectively excited by near-ultraviolet light and emit red, green, and blue primary colors to form a white light LED. However, the red phosphor Y currently used in white LEDs 2 o 2 S:Eu 3+ The emission efficiency is relatively low, which cannot meet the needs of high-performance devices, and the sulfide matrix is ​​unstable. Therefore, it is necessary to develop new red phosphors that can be efficiently excited by near-ultraviolet light. [0003] Molybdate is chemically stable a...

Claims

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Application Information

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IPC IPC(8): C09K11/78
Inventor 李锋王桂萍王桂燕
Owner SHENYANG UNIV
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