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Aluminosilicate blue phosphor powder used for LEDs with near ultraviolet excitation and method for preparing same

A technology of blue fluorescent powder and aluminosilicate, which is applied in the direction of luminescent materials, chemical instruments and methods, and the use of gas discharge lamps, etc., and can solve the problem of the decrease of phosphor performance and luminous performance, low excitation efficiency and luminous efficiency, Affect the performance of white light LEDs and other issues, to achieve the effect of shortening the chemical reaction time, accelerating the chemical reaction speed, and fine particles

Inactive Publication Date: 2010-06-16
SICHUAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the low near-ultraviolet excitation efficiency and low luminous efficiency of the current commercial blue phosphors, blue light is easily absorbed by red and green phosphors, which affects the performance of white LEDs.
[0004] The preparation method of commercial fluorescent powder is still based on high-temperature solid-phase method at present, such as: CN 101126024A, CN 101525536A, CN 101497791A, although the preparation of fluorescent powder by this method has the advantages of simple process and low cost, but the synthesis temperature is high and the calcination time Long, miscellaneous phases can easily lead to coarse grains and low luminous efficiency, which will cause a significant decline in the usability and luminous performance of phosphors

Method used

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  • Aluminosilicate blue phosphor powder used for LEDs with near ultraviolet excitation and method for preparing same
  • Aluminosilicate blue phosphor powder used for LEDs with near ultraviolet excitation and method for preparing same
  • Aluminosilicate blue phosphor powder used for LEDs with near ultraviolet excitation and method for preparing same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] According to the general chemical formula Ba 0.985 al 2 Si 2 o 8 :0.015Eu 2+ Weigh the Ba(NO 3 ) 2 (A.R.)0.985mol, Al(NO 3 ) 3 9H 2 O(A.R.)2mol, H 2 SiO 3 (A.R.)2mol and Eu(NO 3 ) 3 ·6H 2 O (A.R.) 0.015mol; Take by weighing respectively 0.1wt% surfactant sodium dodecylbenzene sulfonate and flux H of the total mass of the above medicines 3 BO 3 ; The Ba(NO 3 ) 2 , Al(NO 3 ) 3 9H 2 O, H 2 SiO 3 , Eu(NO 3 ) 3 ·6H 2 O, surfactant and ligand NH 4 HCO 3 (The ratio of the reactant and the ligand is 1: 3) fully mixed, and then ball milled, adding lubricant acetone during ball milling, the amount of acetone added is limited to be kept dispersed by the ball milling system until the reactant and the ligand react completely; Filtration, washing, and drying to obtain the precursor powder; after mixing the precursor powder and flux uniformly, calcining in a reducing atmosphere provided by activated carbon powder combustion, the calcining temperature is 1300 ...

Embodiment 2

[0027] According to the general chemical formula Ba 0.975 al 2 Si 2 o 8 :0.025Eu 2+ Weigh out BaCl 2 2H 2 O(A.R.)0.975mol, AlCl 3 (A.R.)2mol, H 2 SiO 3 (A.R.)2mol and Eu(NO3 ) 3 ·6H 2 O(A.R.) 0.025mol; Take by weighing respectively 0.3wt% surfactant sodium dodecylbenzene sulfonate and flux MgF of the above drug total mass 2 ; BaCl to be weighed 2 2H 2 O, AlCl 3 、H 2 SiO 3 , Eu(NO 3 ) 3 ·6H 2 O, surfactants and ligands (NH 4 ) 2 CO 3 (The ratio of the reactant and the ligand is 1: 3) fully mixed, and then ball milled, adding lubricant acetone during ball milling, the amount of acetone added is limited to be kept dispersed by the ball milling system until the reactant and the ligand react completely; Filtration, washing, and drying to obtain the precursor powder; after mixing the precursor powder and flux uniformly, calcining in a reducing atmosphere provided by activated carbon powder combustion, the calcining temperature is 1300 ° C, and the calcining time...

Embodiment 3

[0029] According to the general chemical formula Sr 0.965 Al 2 Si 2 o 8 :0.035Eu 2+ Weigh the Sr(NO 3 ) 2 (A.R.)0.965mol, Al(NO 3 ) 3 9H 2 O(A.R.)2mol, H 2 SiO 3 (A.R.)2mol and Eu(NO 3 ) 3 ·6H 2 O (A.R.) 0.035mol; Take by weighing respectively 0.5wt% surfactant sodium dodecylbenzene sulfonate and flux Li of the total mass of the above medicines 2 CO 3 ; The Sr(NO 3 ) 2 , Al(NO 3 ) 3 9H 2 O, H 2 SiO 3 , Eu(NO 3 ) 3 ·6H 2 O, surfactant and ligand C 2 h 2 o 4 (The ratio of the reactant and the ligand is 1: 3) fully mixed, and then ball milled, adding lubricant acetone during ball milling, the amount of acetone added is limited to be kept dispersed by the ball milling system until the reactant and the ligand react completely; Filtration, washing, and drying to obtain the precursor powder; after mixing the precursor powder and flux uniformly, calcining under the reducing atmosphere provided by the combustion of activated carbon powder, the calcining tempe...

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Abstract

The invention provides aluminosilicate blue phosphor powder used for white LEDs with near ultraviolet excitation and belongs to the technique of preparing rare earth phosphor powder. The chemical formula of the aluminosilicate blue phosphor powder is: M1-x-yAyAl2Si2O8: xEu2+, wherein the M is one of Ca, Sr and Ba, and A is one of Ca, Sr and Ba except the M element; and x is more than 0 and less than 0.1, and y is more than or equal to 0 and less than or equal to 0.2. The preparation method comprises the following steps of: in a stoichiometric ratio of the chemical formula, weighing up needed alkaline earth metal compounds, aluminum compounds, silicic acid, europium nitrate and a proper amount of surface active agent and fluxing agent; fully mixing the alkaline earth metal compounds, the aluminum compounds, the silicic acid, the europium nitrate, the surface active agent and a proper amount of ligands, ball-milling the mixture, and adding a proper amount of lubricants while ball-milling; performing pumping filtration, washing and drying to obtain a precursor; and mixing the precursor and the fluxing agent, and calcining the mixture under a reducing atmosphere to obtain the phosphor powder. The phosphor powder has the advantages of wide excitation wavelength, high luminous intensity, good crystallinity, small grain size and narrow grain size distribution and is suitable for the white LEDs.

Description

1. Technical field [0001] The invention belongs to the technical field of luminescent materials, and in particular relates to a near-ultraviolet-excited aluminosilicate blue fluorescent powder for LEDs and a preparation method thereof. 2. Background technology [0002] With the global energy shortage, power shortage and serious environmental pollution, the development and use of energy-saving and environmentally friendly green lighting products has gained the consensus of people all over the world. With its energy saving, environmental protection, fast response, waterproof, shockproof and other characteristics, LED is recognized as one of the most promising high-tech industries by countries all over the world, and is known as the green light source of the 21st century. Since 2007, countries and regions such as Australia, Canada, the United States, the European Union, Japan, and Taiwan have successively announced that they will phase out incandescent lamps. Driven by the "Na...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/64
CPCY02B20/181Y02B20/00
Inventor 朱达川马明星涂铭旌
Owner SICHUAN UNIV
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