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Rare-earth yttrium-aluminium garnet luminous material and its gas-phase preparing method

A technology of yttrium aluminum garnet and luminescent material, applied in the field of luminescent material, can solve the problems of unequal size, hollow shape and high energy consumption, and achieve the effects of stable temperature characteristics, uniform size and low energy consumption

Inactive Publication Date: 2006-05-24
TIANJIN UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The solid-phase synthesis method is a traditional method for preparing rare-earth-doped YAG luminescent materials, which is easy to scale up. The main disadvantages are: (1) the particle size of the added raw materials is not equal, and the components are not easy to mix uniformly; (2) the raw materials and burnt The finished product usually requires ball milling, and impurities such as iron are easily introduced in the process; (3) the calcination temperature is relatively high, and the product, except for the main crystal phase YAG (Y 3 Al 5 o 15 ), there is often a small amount of mesophase, such as YAM (YAl 2 o 9 ) and YA (YAlO 3 ); (5) Higher temperature calcination and ball milling process has high energy consumption and high noise
At the same time, the main problem of the existing spray-pyrolysis is that when the atomized droplets of the solution that is completely salt ions evaporate rapidly, and when the xerogel particles are fired subsequently, the particles are easily damaged or hollow. , not easy to form a spherical

Method used

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  • Rare-earth yttrium-aluminium garnet luminous material and its gas-phase preparing method
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  • Rare-earth yttrium-aluminium garnet luminous material and its gas-phase preparing method

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Experimental program
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Effect test

example 1

[0024] According to pseudo-boehmite: water=5:95 (percent weight ratio), the pseudo-boehmite is dissolved in deionized water, and the acidity is adjusted to pH=2 with a nitric acid solution with a percentage concentration of 30%. After dispersion, a stable colloid is obtained, and the seed crystal is about 5 nanometers; according to the chemical formula, it is Y 3-m Al 5-n R n o 15 : Ce m , wherein the number of atomic moles m=0.02, n=1, R=Ga, and B are added at the same time, and the number of atomic moles is 0.5 each. Add yttrium nitrate, cerium nitrate, gallium nitrate and boric acid, and perform mechanical stirring to form a doped sol, and the sol is left to stand for 24 hours; set the atomization parameters as follows: inlet temperature 250°C, dry air volume 100m 3 / h, the material flow is 2L / h, and the atomized particles are obtained; 2 +H 2 After the mixed gas is fired at 1200°C for 2 hours, a pure YAG phase product with a yellow body color is obtained, and the ave...

example 2

[0027] According to pseudo-boehmite: water=10:90 (percent weight ratio), the pseudo-boehmite is dissolved in deionized water, and the acidity is adjusted to pH=4 by a hydrochloric acid solution with a percentage concentration of 30%. After dispersion, a stable colloid is obtained, and the seed crystal is about 20 nanometers; press Y 3-m Al 5-n B n o 15 : Ce m , m=0.05, n=3, add yttrium nitrate, cerium nitrate, magnesium nitrate and boric acid, and perform mechanical stirring to form a doped sol, and the sol stands still for 24 hours; set the atomization parameters as follows: inlet temperature 1500°C, dry air volume 200m 3 / h, the material flow is 1L / h, to obtain atomized particles; use activated carbon in the lifting furnace to obtain a weak reducing atmosphere, and after firing at 1300°C for 3 hours, a pure YAG phase product with a yellow body color is obtained, and the particle average The particle size is 1 micron, spherical and solid. The XRD collection of luminescent...

example 3

[0029] According to pseudo-boehmite: water=15:85 (percent weight ratio), the pseudo-boehmite is dissolved in deionized water, and the acidity is adjusted to pH=6 with a hydrochloric acid solution with a percentage concentration of 30%. A stable colloid is obtained after dispersion, and the seed crystal is about 40 nanometers; press Y 3-m al 5-n B n o 15 : Ce m , m=0.01, n=1 Add yttrium nitrate, cerium nitrate and boric acid, carry out ultrasonic dispersion, form doped sol, sol stand still for 24 hours; set atomization parameters as: inlet temperature 110 ℃, dry air volume 300m 3 / h, the material flow is 1.5L / h, to obtain atomized particles; use the ammonolysis furnace to obtain a weak reducing atmosphere, and after firing at 1600°C for 5 hours, a pure YAG phase product with a yellow body color and an average particle size of 5 microns, spherical solid. The XRD collection of luminescent materials is the same as example 1, and the excitation and emission spectra are shown i...

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Abstract

The invention discloses a rare earth yttrium aluminum garnet emitting material and the air phase manufacturing method that belongs to material technology field. The main feature is that it adopts nm imitated thin diasporite colloidal particle that the nm range is from 5 to 40 as the seed crystal to form a stable sol with the special salt and making spherical particle by air phase method and gaining pure YAG phase emitting material through high temperature treatment. The invention has pure phase, equal size and stable temperature feature.

Description

【Technical field】 [0001] The invention relates to the technical field of luminescent materials, in particular to a rare earth yttrium aluminum garnet luminescent material with a spherical shape and nanometer to micron size, and a preparation method using a combination of nanoscale alumina seed crystal sol technology and gas phase preparation technology. 【Background technique】 [0002] Yttrium aluminum garnet (chemical formula Y 3 Al 5 o 15 , abbreviated as YAG) ceramics have the advantages of high temperature resistance to oxidation, small creep, and low thermal conductivity, and can be applied to refractory and insulating materials; YAG is an equiaxed crystal system, without birefringence effect, and can be applied to Transparent ceramics are used as solid-state laser materials to replace YAG single crystals; YAG doped with rare earth elements and transition group ions is an extremely important white light diode luminescent material. [0003] The solid-phase synthesis me...

Claims

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Application Information

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IPC IPC(8): C09K11/80
Inventor 王达健李岚张纳蒙延双张晓松
Owner TIANJIN UNIVERSITY OF TECHNOLOGY
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