Preparation method of blue aluminate fluorescent powder with high brightness and high stability

A high-stability, aluminate technology, applied in the field of material manufacturing, can solve problems such as damage to the brightness and luminous efficiency of phosphors, grain crystal defects, etc., and achieve the effects of easy industrial production, uniform particle size, and improved brightness.

Inactive Publication Date: 2013-03-06
LANZHOU UNIVERSITY
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  • Abstract
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  • Claims
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Problems solved by technology

The patent "Preparation Method of Blue Aluminate Phosphor Powder Activated by Vacuum Ultraviolet Rays" (Patent No. 02155321.1, Publication No. CN141569A, Publication Date 2003.05.07) discloses a blue phosphor Ba 1-x Eu x MgAl 10 o 17 In the preparation process, the burnt materials need to be ball milled, and the rolling and friction in the ball milling process will cause crystal defects in the grains, which become non-radiative transition centers, and may also produce amorphous particles on the crystal surface. Non-luminescent film seriously damages the brightness and luminous efficiency of phosphor, therefore, this method cannot well meet the needs of actual production

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  • Preparation method of blue aluminate fluorescent powder with high brightness and high stability
  • Preparation method of blue aluminate fluorescent powder with high brightness and high stability
  • Preparation method of blue aluminate fluorescent powder with high brightness and high stability

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Embodiment 1

[0037] According to the chemical expression Ba of the blue aluminate phosphor 0.9 MgAl 10 o 17 :0.1Eu 2+ According to the stoichiometric ratio of this chemical formula, aluminum oxide, aluminum nitride, barium sulfate, magnesium oxide and europium oxide are respectively taken to form the starting material, ammonium bicarbonate is taken by 2% of the starting material quality, and ammonium bicarbonate is obtained by 7.3 grams of starting material The ratio of adding 100ml of absolute ethanol to the mixture, taking absolute ethanol, mixing the starting material, ammonium bicarbonate and absolute ethanol, and ball milling for 10 hours to obtain a raw material powder with a central particle size of 0.9-2.1 μm; place the raw material powder In an air-filled environment, raise the ambient temperature to 1100°C at a heating rate of 5°C / min, keep it warm for 10 hours, and cool to room temperature to obtain a calcined powder; First wash in dilute hydrochloric acid at a temperature of...

Embodiment 2

[0039] According to the chemical expression Ba of the blue aluminate phosphor 0.9 MgAl 10 o 17 :0.1Eu 2+ According to the stoichiometric ratio of the chemical formula, aluminum oxide, aluminum nitride, barium carbonate, magnesium oxide and europium oxide are respectively taken to form the starting material, aluminum fluoride is taken according to 6% of the starting material mass, and then starting from 7.3 grams The ratio of adding 150ml of absolute ethanol to the starting material, taking absolute ethanol, mixing the starting material, aluminum fluoride and absolute ethanol, and ball milling for 24 hours to obtain a raw material powder with a central particle size of 0.9-2.1 μm; the raw material The powder is placed in an environment with a reducing atmosphere, the reducing atmosphere is composed of 90% nitrogen and 10% hydrogen by volume; the ambient temperature is raised to 1700°C at a heating rate of 10°C / min, and the temperature is kept for 2 hours. Then, cool to room ...

Embodiment 3

[0041] According to the chemical expression Ba of the blue aluminate phosphor 0.9 MgAl 10 o 17 :0.1Eu 2+ According to the stoichiometric ratio of the chemical formula, aluminum oxide, aluminum nitride, barium carbonate, magnesium oxide and europium oxide are respectively taken to form the starting material, lithium carbonate is taken according to 4% of the starting material quality, and then 7.3 grams of starting material Add 125ml of absolute ethanol to the raw material, take absolute ethanol, mix the starting material, lithium carbonate and absolute ethanol, and ball mill for 17 hours to obtain a raw material powder with a central particle size of 0.9-2.1 μm; place the raw material powder In an environment where a reducing atmosphere is introduced, the reducing atmosphere is composed of 95% nitrogen and 5% hydrogen by volume; at a heating rate of 7.5°C / min, the ambient temperature is raised to 1400°C, kept for 6 hours, and cooled to room temperature to obtain a calcined p...

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Abstract

The invention relates to a preparation method of blue aluminate fluorescent powder with high brightness and high stability, relating to the preparation of blue aluminate fluorescent powder with a chemical expression of Ba0.9MgAl10O17:0.1Eu2+. The preparation method comprises the following steps of: respectively taking aluminum oxide, aluminum nitride, barium salt, magnesium oxide and europium oxide in a stoichiometric proportion of the fluorescent powder to form a primary raw material; carrying out the ball milling on the primary raw material, a fluxing agent and absolute ethanol or on the primary raw material and the absolute ethanol to obtain raw material powder; calcining the raw material powder in air or in a reduction atmosphere and cooling to a room temperature once or twice to obtain calcined powder; sequentially washing the powder with dilute hydrochloric acid or deionized water at least once; drying to carry out weak ball milling; washing with the deionized water; and drying and sieving to prepare a blue aluminate fluorescent material with high brightness and high stability. The method can prepare the fluorescent powder with even granularity, high brightness and good luminous efficiency and thermal stability.

Description

technical field [0001] The invention belongs to the technical field of material manufacturing, and relates to a method for preparing a fluorescent material used in a plasma display, in particular to a method for preparing a high-brightness and high-stability blue aluminate phosphor. Background technique [0002] Compared with the commonly used CRT monitors and LCD monitors, it has many advantages such as wide viewing angle, easy to make large screen, light weight, high contrast, fast response, good color reproduction, no distortion, low actual power consumption and resistance to vibration and shock. The current plasma flat panel display (PDP) has become one of the most important large-screen and ultra-thin display methods. PDP display technology is a kind of under the control of the drive circuit, using vacuum ultraviolet rays (wavelengths mainly at 147nm and 172nm) generated by the discharge of xenon (Xe)-based rare gas mixed gas to excite trichromatic fluorescent materials...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K11/64
Inventor 王育华刘碧桃周峻李杰刘吉地卢阳华
Owner LANZHOU UNIVERSITY
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