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Green photoluminescent phosphor and its prepn

A green phosphor, photoluminescence technology, applied in luminescent materials, chemical instruments and methods, etc., can solve problems such as long afterglow time and usage limitations

Inactive Publication Date: 2006-08-02
SHENYANG INSTITUTE OF CHEMICAL TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, in green luminescent materials, the active ions are mainly Mn 2+ and Tb 3+ , while aluminate-based illuminants mostly use Mn 2+ As an activator, this luminescent material generally has a relatively long afterglow time, and its use is limited.

Method used

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  • Green photoluminescent phosphor and its prepn
  • Green photoluminescent phosphor and its prepn

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0015] Embodiment 1: Weigh 0.019g of terbium oxide, 4.5016g of aluminum nitrate, 0.1954g of barium carbonate, and 6g of citric acid. Dissolve citric acid in water to make a citric acid solution. Terbium oxide is dissolved in nitric acid to produce terbium nitrate. Under the condition of heating, successively dissolve barium carbonate, aluminum nitrate and terbium nitrate in citric acid solution, and adjust the pH value to 6-7. Heat and stir at 80°C, and keep the pH value until gelling. The gel was dried for 2h to a bulky black powder. After grinding, the dry powder is calcined at 1200°C for 2 hours, then cooled to 900°C and fired with reducing gas for 2 hours to obtain a white fluorescent powder called Ba 0.99 al 12 o 19 :Tb 0.01 . Under the excitation of 276nm, the fluorescent powder has an emission peak at 550nm and is a single peak, and its luminous intensity is greater than that of the Ba prepared by the solid-phase method in Embodiment 2. 0.99 al 12 o 19 :Tb 0....

Embodiment approach 2

[0017] Embodiment 2: Weigh 0.019g of terbium oxide, 0.6118g of aluminum oxide, 0.1954g of barium carbonate and 0.015g of boron oxide, grind the above medicines with an agate mortar, and burn them at 1300°C for 2 hours in a reducing atmosphere to obtain a white Ba 0.99 al 12 o 19 :Tb 0.01 Phosphor powder, under the excitation of 276nm, a single emission peak at 550nm can be obtained, and the half-peak width is 12.2nm.

Embodiment approach 3

[0018] Embodiment three: take terbium oxide 0.037g, barium carbonate 0.1934g, other conditions are the same as embodiment two, and the white fluorescent powder that makes is Ba 0.98 al 12 o 19 :Tb 0.02 , when the phosphor is excited at 276nm, the emission peak has no change in the shape and position of the emission peak obtained by Scheme 1, the difference is that the luminous intensity is greater than Ba 0.99 al 12 o 19 :Tb 0.01 of luminous intensity.

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Abstract

The present invention relates to new material, and is especially new type of green photoluminescent phosphor and its preparation. The phosphor is RE Tb activated aluminate green phosphor in the expression of M1-XAl12O19:Tb3+x, where, M is Ba2+, Sr2+ and Ca2+, and x is 0.005-0.06. The phosphor is prepared through either a solid phase process including mixing and grinding materials terbium oxide, alumina, barium carbonate and boron oxide, and roasting for over 2 hr; or a sol-gel process including dissolving barium carbonate, aluminum nitrate a RE nitrate in citric acid solution, heating and stirring in water bath to form sol, drying the sol to form loose black powder, grinding and high temperature roasting. The phosphor has short afterglow, high light emitting strength, high light emitting efficiency, and small and homogeneous grain size.

Description

technical field [0001] The present invention relates to a new material and its preparation method, in particular to a photoluminescent green fluorescent powder based on aluminate and its preparation method Background technique [0002] Aluminate phosphor has the characteristics of good high temperature resistance and high stability, and has been used in phosphor as an excellent matrix of luminous body. At present, in green luminescent materials, the active ions are mainly Mn 2+ and Tb 3+ , while aluminate-based illuminants mostly use Mn 2+ As an activator, this luminescent material generally has a relatively long afterglow time, and its use is limited to a certain extent. Contents of the invention [0003] The object of the present invention is to provide a rare earth terbium-activated aluminate green photoluminescence phosphor, which is a phosphor with high luminous efficiency, good color purity and short afterglow time. The fluorescent powder adopts two manufacturing...

Claims

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Application Information

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IPC IPC(8): C09K11/80
Inventor 肖林久贺明睿
Owner SHENYANG INSTITUTE OF CHEMICAL TECHNOLOGY
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