Method for preparing nanometer silicate fluorescent powder

A nano-silicate and fluorescent powder technology, applied in chemical instruments and methods, luminescent materials, etc., can solve problems such as coarse crystal grains, affecting luminous intensity, and destroying the crystal shape of silicate materials, so as to achieve uniform particle size distribution and good luminescence effect, the effect of improving microstructure and macroscopic properties

Inactive Publication Date: 2012-08-22
IRICO
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  • Abstract
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  • Application Information

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Problems solved by technology

[0003] Silicate is an important new choice in the production of phosphor powder-converted white light LEDs, because the material has significant absorption of ultraviolet, near ultraviolet, and blue light; the cost of mass production is low; in the application of ultraviolet LEDs, it has high Temperature stability (at least above 120°C); physical (such as high-intensity radiation) and chemical stability, anti-oxidation, moisture resistance, and the advantages of not interacting with packaging resin; and can be used with UV / blue chips to produce various color temperatures white light LED, but the disadvantage is that the crystal grains synthesized by the traditional high-temperature solid-phase synthesis method are relatively coarse. In order to obtain powdery silicate materials, it is necessary to grind the blocky sintered materials finely. This process will destroy the silicate materials. Crystal form, which affects its luminous intensity

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  • Method for preparing nanometer silicate fluorescent powder
  • Method for preparing nanometer silicate fluorescent powder
  • Method for preparing nanometer silicate fluorescent powder

Examples

Experimental program
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Effect test

Embodiment 1

[0026] Silicate phosphor Ba 1.78 Sr 0.2 SiO 4 : the preparation of 0.02Eu comprises the following steps:

[0027] 1) According to the general chemical formula Ba 1.78 Sr 0.2 SiO 4 : 0.02Eu weighed SrCO 3 0.42g, Eu 2 o 3 0.05g, use a mixture of 30ml of 5-10% dilute nitric acid and 300ml of deionized water as a solvent (the amount of acid is based on the ability to dissolve), and heat to 40°C to dissolve to obtain solution A;

[0028] 2) According to the general chemical formula Ba 1.78 Sr 0.2 SiO 4 : 0.02Eu weighed BaCO 3 5g, 320ml of tetraethyl orthosilicate (TEOS), 18g of citric acid, mixed and added to 600ml of absolute ethanol, heated to 40°C to dissolve, and then ultrasonically dispersed to obtain a uniform suspension B;

[0029] 3) 0.18 g of catalyst boric acid was heated and dissolved with 20 mL of distilled water to obtain solution C;

[0030] 4) Mix solution A, uniform suspension B and solution C, and then add ammonia water to the solution to adjust the ...

Embodiment 2

[0035] Silicate phosphor Ba 1.73 Sr 0.5 SiO 4 : the preparation of 0.02Eu comprises the following steps:

[0036] 1) According to the general chemical formula Ba 1.73 Sr 0.5 SiO 4 : 0.02Eu weighed SrCO 3 1.081g, Eu 2 o 3 0.052g, use the mixed solution of 30ml of 10% dilute nitric acid and 300ml of deionized water as solvent (acid consumption is based on the ability to dissolve), heated to 40°C for dissolution, to obtain solution A;

[0037] 2) According to the general chemical formula Ba 1.73 Sr 0.5 SiO 4 : 0.02Eu weighed BaCO 3 5g, 330ml of tetraethyl orthosilicate (TEOS), 18.5g of citric acid, mixed and added to 600ml of absolute ethanol, heated to 40°C to dissolve, and then ultrasonically dispersed to obtain a uniform suspension B;

[0038] 3) 0.22 g of catalyst boric acid was heated and dissolved in 20 mL of distilled water to obtain solution C;

[0039] 4) Mix solution A, uniform suspension B and solution C, then add ammonia water to the solution, and adju...

Embodiment 3

[0043] Silicate phosphor Ba 1.73 Sr 0.5 SiO 4 : the preparation of 0.02Eu comprises the following steps:

[0044] 1) According to the general chemical formula Ba 1.73 Sr 0.5 SiO 4 : 0.02Eu weighed SrCO 3 1.081g, Eu 2 o3 0.052g, use the mixed solution of 50ml of 5% dilute nitric acid and 300ml of deionized water as solvent (acid consumption is subject to dissolving), be heated to 40 ℃ and dissolve, obtain solution A;

[0045] 2) According to the general chemical formula Ba 1.73 Sr 0.5 SiO 4 : 0.02Eu weighed BaCO 3 5g, 330ml of tetraethyl orthosilicate (TEOS), 18.5g of citric acid, mixed and added to 500ml of absolute ethanol, heated to 40°C to dissolve, and then ultrasonically dispersed to obtain a uniform suspension B;

[0046] 3) 0.15 g of catalyst boric acid was heated and dissolved with 20 mL of distilled water to obtain solution C;

[0047] 4) Mix solution A, uniform suspension B and solution C, then add ammonia water to the solution to adjust the pH value o...

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Abstract

The invention discloses a method for preparing nanometer silicate fluorescent powder. A chemical general formula of the silicate fluorescent powder is BaxAySiO4: (2-x-y) Eu. Common inexpensive compounds are adopted as raw materials, the mixing of a precursor is carried out in solution when gel is prepared through a sol-gel method so as to be uniform in a short time, and nanoscale and even molecular-scale can be reached, so that the silicate fluorescent powder has better reactivity; two stages of sintering during sintering are carried out, so that oversize crystal particles produced in a high-temperature process are avoided; the microscopic structure and the macroscopic performance of the material can be improved; luminescent materials with uniform size distribution can be obtained; the sintering temperature is reduced by 300-500 DEG C compared with a high temperature solid state method; the product is fluffy and easy to smash; and a better luminescent effect can be obtained.

Description

technical field [0001] The invention belongs to the technical field of fluorescent powder for LEDs, and relates to a preparation method of nano silicate fluorescent powder. Background technique [0002] White-emitting light-emitting diodes (LEDs) emerged in the late 1990s as the fourth generation of lighting sources. There are two important schemes for realizing white light LED: (1) blue light LED chip and yellow light-emitting phosphor that can be effectively excited by blue light are organically combined to form white light LED; (2) ultraviolet light-emitting LED chip and It can be effectively excited by ultraviolet light to emit red, blue and green three primary color phosphors or multi-primary color phosphors organically combined. [0003] Silicate is an important new choice in the production of phosphor powder-converted white light LEDs, because the material has significant absorption of ultraviolet, near ultraviolet, and blue light; the cost of mass production is low;...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/59
Inventor 赵莉
Owner IRICO
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