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A kind of near-ultraviolet light excited fluorine-doped tungsten molybdate luminescent material and synthesis method

A technology of tungstomolybdate and luminescent materials, which is applied in the direction of luminescent materials, chemical instruments and methods, etc., to achieve the effects of excellent luminescence performance, reduced probability of non-radiative transition, excellent luminescence and temperature quenching characteristics

Active Publication Date: 2020-02-21
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, people have developed many kinds of luminescent materials, such as nitrides, sulfides, alkaline earth aluminates, silicates, molybdates, tungstates, phosphates and borates, but for tungstomolybdic acid There are few reports on salt systems doped with fluorine

Method used

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  • A kind of near-ultraviolet light excited fluorine-doped tungsten molybdate luminescent material and synthesis method
  • A kind of near-ultraviolet light excited fluorine-doped tungsten molybdate luminescent material and synthesis method
  • A kind of near-ultraviolet light excited fluorine-doped tungsten molybdate luminescent material and synthesis method

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preparation example Construction

[0028] A method for synthesizing a fluorine-doped tungstomolybdate light-emitting material excited by near-ultraviolet light, comprising the following steps:

[0029] 1) First, according to the chemical formula NaRe(MoW)O 8-x / 2 f x :10mol%Eu 3+ , where x=0.1-0.5, Re is Gd, Y, Bi, La, Lu, Pr or Ce, and Eu 2 o 3 and Re 2 o 3 dissolved in HNO 3 , prepared as solution A, in solution A Eu(NO 3 ) 3 The concentration is 0.1mol / L, Re(NO 3 ) 3 The solubility is 0.9mol / L, and keep stirring, then add 1mol / L NaNO in solution A 3 Aqueous solution, 1mol / L H 40 N 10 o 41 W 12 Aqueous solution, 1mol / L (NH 4 ) 6 Mo 7 o 24 4H 2O aqueous solution and 0.1-0.5mol / L NaF aqueous solution, and add the combustion aid urea, the ratio of its amount to the amount of nitrate n (urea): n (NO 3 - )=2:1, obtain mixed solution;

[0030] 2) Stir the mixture evenly, transfer it to a muffle furnace that has been heated to 600°C in advance and keep the temperature constant for 5 minutes, tak...

Embodiment 1

[0036] 1) the Eu 2 o 3 and Gd 2 o 3 dissolved in concentrated HNO 3 Prepare solution A in solution A, Eu(NO 3 ) 3 The concentration is 0.1mol / L, Gd(NO 3 ) 3 The solubility is 0.9mol / L, and keep stirring, then add 1mol / L NaNO 3 Aqueous solution, H 40 N 10 o 41 W 12 Aqueous solution, (NH 4 ) 6 Mo 7 o 24 4H 2 O aqueous solution and 0.1mol / L NaF solution, and add the combustion aid urea, the ratio of its amount to the amount of nitrate n (urea): n (NO 3 - )=2:1;

[0037] 2) Stir the mixed liquid evenly, transfer it to the muffle furnace which has been heated to 600°C in advance, keep the temperature for 5 minutes, take it out and grind it evenly, then heat it up to 900°C in the muffle furnace, keep the temperature for 4 hours, take it out After cooling to room temperature, the fluorine-doped tungstomolybdate luminescent material can be obtained. Its chemical composition is: NaGd 0.9 (MoW)O 7.95 f 0.1 :0.1Eu 3+ .

Embodiment 2

[0039] 1) the Eu 2 o 3 and Gd 2 o 3 dissolved in concentrated HNO 3 In solution A, in solution A Eu(NO 3 ) 3 The concentration is 0.1mol / L, Gd(NO 3 ) 3 The solubility is 0.9mol / L, and keep stirring, then add 1mol / L NaNO 3 Aqueous solution, H 40 N 10 o 41 W 12 Aqueous solution, (NH 4 ) 6 Mo 7 o 24 4H 2 O aqueous solution and 0.2mol / L NaF solution, and add the combustion aid urea, the ratio n(urea) of the substance amount of it and the nitrate radical:n(NO 3 - )=2:1;

[0040] 2) Stir the mixture evenly, transfer it to a muffle furnace that has been heated to 600°C in advance and keep the temperature for 5 minutes, take it out and grind it evenly, then heat it up to 900°C in the muffle furnace, keep the temperature for 4 hours, and take it out After cooling to room temperature, the fluorine-doped tungstomolybdate luminescent material can be obtained. Its chemical composition is: NaGd 0.9 (MoW)O 7.9 f 0.2 :Eu 3+ .

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Abstract

The invention discloses a near-ultraviolet-excited fluorine-doped molybdate-tungstate light-emitting material and a synthetic method thereof; the chemical composition of the near-ultraviolet-excited fluorine-doped molybdate-tungstate light-emitting material is NaRe0.9(MoW)O8-x / 2Fx: 10 mol%Eu3+(Re=Gd, Y, Bi, La, Lu, Pr or Ce). The near-ultraviolet-excited fluorine-doped molybdate-tungstate light-emitting material is prepared from ammonium molybdate, ammonium tungstate, sodium nitrate, Re2O3 and sodium fluoride by using Eu2O3 as an activator via modified high-temperature solid state process; the preparation method comprises: dissolving Eu2O3 and Re2O3 in HNO3, stirring nonstop, adding deionized water into the solution, adding other agents in a stoichiometric ratio, and adding urea as a combustion improver; stirring and grinding well the mixed solution via the modified high-temperature solid state process, transferring the colorless transparent solution to a muffle furnace preheated to 600 DEG C, maintaining the constant temperature for 5 min, taking out, grinding well, heating in the muffle furnace to 850-950 DEG C, maintaining the constant temperature for 4 h, taking out, and cooling to room temperature to obtain a sample. The sample prepared herein has uniform grain size, excellent light-emitting performance and good stability and has temperature quenching characteristics.

Description

technical field [0001] The invention relates to a luminescent material and a preparation method, in particular to a fluorine-doped tungstomolybdate luminescent material excited by near ultraviolet light and a synthesis method. Background technique [0002] With the advancement and development of science and technology and people's urgent demand for new energy and materials, new luminescent materials have become a hot topic of concern and discussion. At present, people have developed many kinds of luminescent materials, such as nitrides, sulfides, alkaline earth aluminates, silicates, molybdates, tungstates, phosphates and borates, but for tungstomolybdic acid There are few reports on the doping of salt systems with fluorine. [0003] Tungstomolybdate is a typical self-activated fluorescent material. Because of its good chemical stability, low synthesis temperature, simple preparation, strong luminescence performance and excellent mechanical properties as a matrix, it is wid...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K11/78
CPCC09K11/7794
Inventor 樊国栋邱小云胡荣玲冯昕钰
Owner SHAANXI UNIV OF SCI & TECH