Novel garnet-based high efficiency green phosphor

A green fluorescent powder, garnet-based technology, applied in the field of new garnet-based high-efficiency green fluorescent powder and its preparation, can solve the problems of poor stability of fluorescent powder and achieve good dispersion effect

Inactive Publication Date: 2015-09-16
UNIV OF JINAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] At present, there are green phosphors with matrix systems such as silicates, aluminates, borates, etc., mainly focusing on Tb 3+ doping, and its ubiquitous problem is poor stability of phosphor

Method used

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  • Novel garnet-based high efficiency green phosphor
  • Novel garnet-based high efficiency green phosphor
  • Novel garnet-based high efficiency green phosphor

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Experimental program
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Effect test

Embodiment 1

[0028] According to the chemical formula of the phosphor [(Gd 1-x Lu x ) 1-y Tb y ]Al 5 o 12 , take x=0.2; y=0.025, 0.05, 0.075, 0.10, 0.15. Weigh the reagents according to the stoichiometric ratio, and the reagents include Gd 2 o 3 (purity 99.99%), Lu 2 o 3 (purity 99.99%), Tb 2 o 3 (purity 99.99%), aluminum ammonium sulfate (NH 4 Al(SO 4 ) 2 12H 2 O, purity >99%), ammonium bicarbonate (NH 4 HCO 3 , analytically pure) and concentrated nitric acid (HNO 3 , analytically pure). Powdered RE 2 o 3 (RE=Gd, Lu and Tb) dissolved in hot nitric acid to prepare rare earth nitrate solution. And the obtained rare earth nitrate solution and aluminum ammonium sulfate solution (0.15mol / L) were prepared into 200mL mother salt solution according to the molar ratio of RE / Al=3:5. The total concentration of rare earth cations in the mother salt solution was maintained at 0.09 mol / L to ensure a (Gd+Lu+Tb):Al atomic ratio of 3:5. Then, the prepared mother salt solution was d...

Embodiment 2

[0031] According to the chemical formula of the phosphor [(Gd 1-x Lu x ) 1-y Tb y ]Al 5 o 12 , take x=0.1, 0.2, 0.3, 0.4, 0.5; y=0.1. Weigh the reagents according to the stoichiometric ratio, and the reagents include Gd2 o 3 (purity 99.99%), Lu 2 o 3 (purity 99.99%), Tb 2 o 3 (purity 99.99%), aluminum ammonium sulfate (NH 4 Al(SO 4 ) 2 12H 2 O, purity >99%), ammonium bicarbonate (NH 4 HCO 3 , analytically pure) and concentrated nitric acid (HNO 3 , analytically pure). Powdered RE 2 o 3 (RE=Gd, Lu and Tb) dissolved in hot nitric acid to prepare rare earth nitrate solution. And the obtained rare earth nitrate solution and aluminum ammonium sulfate solution (0.15mol / L) were prepared into 200mL mother salt solution according to the molar ratio of RE / Al=3:5. The total concentration of rare earth cations in the mother salt solution was maintained at 0.09 mol / L to ensure a (Gd+Lu+Tb):Al atomic ratio of 3:5. Then, the prepared mother salt solution was dropped in...

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Abstract

The invention provides a novel garnet-based high efficiency green phosphor, a chemical formula is [(Gd1-xLux)1-yTby]Al5O12 (short for (Gd, Lu)AG:Tb<3+>), wherein x is Lu/(Gd+Lu+Tb) and y is Tb/(Gd+Lu+Tb)(x is 0-1.0, y is 0-0.15). The phosphor takes rare earth nitrate and an ammonium aluminium sulfate according to stoichiometric ratio to prepare a mother salting liquid, the mother salting liquid is dropped into a NH4HCO3 precipitating agent solution, the obtained deposition is centrifuged, washed, and dried to obtain the white precursor powder, and phosphor (Gd, Lu)AG:Tb<3+> can be obtained through calcining at different temperature. non radiation energy transmission of Gd<3+> to Tb<3+> is existed, the fluorescence quantum efficiency is high, addition of Lu can obvious improve the stability of a system, and is more suitable for a scintillator material.

Description

technical field [0001] The invention belongs to the field of rare earth fluorescent materials, and in particular relates to a novel garnet-based high-efficiency green fluorescent powder and a preparation method thereof. Background technique [0002] Compared with traditional lighting technology, white LED has the advantages of high luminous efficiency, low energy consumption, long service life, environmental protection and no pollution. Widely used, it is regarded as a new generation of green lighting source to replace incandescent lamps and fluorescent lamps in the 21st century, and there is huge research and utilization space and value. Using the principle of three primary colors, mixing red, green, and blue colors in a certain proportion is one of the main ways to obtain LED white light at present. The key to this method is to prepare phosphors with excellent performance. [0003] At present, there are green phosphors with matrix systems such as silicates, aluminates, bo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/80
Inventor 李金凯李琪侯青月刘宗明
Owner UNIV OF JINAN
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