Method for preparing ultraviolet excited or vacuum ultraviolet excited green emitting phosphor

A green fluorescent powder and vacuum ultraviolet technology, which is applied in the direction of luminescent materials, chemical instruments and methods, etc., can solve the problems of cumbersome technical process, large color rendering and chromaticity drift, and low brightness

Inactive Publication Date: 2013-01-23
CAIHONG GRP ELECTRONICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, most of the high-temperature oxidation and low-temperature reduction solid-phase synthesis methods are used in the market, but the technical process is relatively cumbersome, the process is complicated, the product quality is difficult to control, and the product yield is low and the production cost is high. In recent years, with the rapid development of technology, CeMgAl 11 o 19 : Tb green phosphor has been applied in backlight components for display devices, but the products produced by traditional technology have problems such as light efficiency, low brightness, light decay, color rendering and chromaticity drift under vacuum ultraviolet light. Can no longer meet the needs of the market

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] A preparation method for ultraviolet excitation or vacuum ultraviolet excitation green phosphor, comprising the steps of:

[0017] Step 1, weigh 70% α-Al2O3, 3% MgO, 9% Tb by mass percentage 3 o 4 , 18% CeO 2 Dry mixing, each raw material is passed through a 100-mesh sieve before mixing, and BaCO with a raw material quality of 10‰ is introduced into the uniformly mixed raw material 3 , MgCl 2 The solution was thoroughly mixed,

[0018] The dry mixing is to put the sieved raw materials into a ball mill tank, mix them in a weight ratio of 2:1, the balls have a diameter of 5 cm, and mill them for 12-48 hours;

[0019] Step 2, put the mixed powder into an alumina crucible, and burn for 10 hours under a high-temperature reducing atmosphere at 900°C;

[0020] Step 3, crush the burnt fluorescent powder block and pass through a 100-mesh sieve, wet disperse it into a slurry, the particle size is controlled at 12 μm,

[0021] Described wet dispersion is in the ball mill jar...

Embodiment 2

[0025] A preparation method for ultraviolet excitation or vacuum ultraviolet excitation green phosphor, comprising the steps of:

[0026] Step 1, take by weight 72% β-Al2O3, 4% MgO, 8% Tb 3 o 4 , 16% CeO 2 Dry mixing, each raw material is passed through a 100-mesh sieve before mixing, and BaCO with a raw material quality of 8‰ is introduced into the uniformly mixed raw material 3 , MgCl 2 , AlF 3 , MgF 2 mix well,

[0027] The dry mixing is to put the sieved raw materials into a ball mill tank, mix the materials with a weight ratio of 2:1 balls, the diameter of the balls is 5 cm, and ball mill for 20 hours;

[0028] Step 2, put the mixed powder into an alumina crucible, and burn it in a high-temperature reducing atmosphere at 1000°C for 8 hours;

[0029] Step 3, after crushing the burned fluorescent powder block, passing through a 100-mesh sieve, wet dispersion into a slurry, the particle size is controlled at 10 μm,

[0030] The wet dispersion is in a ball mill tank, ...

Embodiment 3

[0034] A preparation method for ultraviolet excitation or vacuum ultraviolet excitation green phosphor, comprising the steps of:

[0035] Step 1, weigh 74% α-Al2O3, 5% MgO, 7% Tb by mass percentage 3 o 4 , 14% CeO 2 Dry mixing, each raw material is passed through a 100-mesh sieve before mixing, and MgF with a raw material quality of 6‰ is introduced into the evenly mixed raw materials 2 、BaF 2 mix well,

[0036] The dry mixing is to put the sieved raw materials into a ball mill tank, mix the materials with a weight ratio of 2:1 balls, the diameter of the balls is 5 cm, and ball mill for 20 hours;

[0037] Step 2, put the mixed powder into an alumina crucible, and burn it in a high-temperature reducing atmosphere at 1100°C for 7 hours;

[0038] Step 3, pulverize the burned fluorescent powder block and pass through a 100-mesh sieve, wet-disperse it into a slurry, and control the particle size at 9 μm,

[0039] The wet dispersion is in a ball mill tank, and aluminum oxide, ...

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Abstract

The invention discloses a method for preparing ultraviolet excited or vacuum ultraviolet excited green emitting phosphor. The method comprises the following steps of: weighing Al2O3, MgO, Tb3O4 and CeO2 in a mass ratio, sieving all raw materials by using a 100-mesh sieve, mixing by a dry method, introducing one or more of BaCO3, MgCl2, AlF3, MgF2, BaF2 and H3BO3 into the uniformly mixed raw materials, and fully mixing; loading the mixed powder into an alumina crucible; firing at high temperature at reducing atmosphere; crushing the fired fluorescent powder blocks, and sieving by using the 100-mesh sieve; dispersing by a wet method to obtain slurry; controlling the particle size to be 2 to 12 mu m; sieving the slurry which is obtained by wet-method dispersing by using a 500-mesh sieve; removing the sieving residues on the 500-mesh sieve; washing with water; and suction-filtering, drying and screening to obtain the green emitting phosphor. The green emitting phosphor has the characteristics of controllable particle size, high brightness, light failure, color development and low color bleaching.

Description

technical field [0001] The invention relates to a preparation method of a green fluorescent powder, in particular to a preparation method of an ultraviolet-excited or vacuum ultraviolet-excited green fluorescent powder. Background technique [0002] CeMgAl excited by UV or vacuum UV 11 o 19 : What the Tb formula represents is a kind of green fluorescent powder, which involves high-temperature solid-phase synthesis, sol-gel method, combustion synthesis and microwave synthesis. At present, most of the high-temperature oxidation and low-temperature reduction solid-phase synthesis methods are used in the market, but the technical process is relatively cumbersome, the process is complicated, the product quality is difficult to control, and the product yield is low and the production cost is high. In recent years, with the rapid development of technology, CeMgAl 11 o 19 : Tb green phosphor has been applied in backlight components for display devices, but the products produced ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/86
Inventor 樊钊锋
Owner CAIHONG GRP ELECTRONICS CO LTD
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