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Method for preparing small grain size manganese zinc silicate green fluorescent powder

A green fluorescent powder, zinc manganese silicate technology, applied in chemical instruments and methods, luminescent materials, etc., can solve the problems of powder yellowing, phosphor brightness drop, yellowing, etc., to eliminate pink yellowing, performance Excellent, particle size reduction effect

Inactive Publication Date: 2007-07-11
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The method is simple to operate, but the synthesized Zn 2 SiO 4 :Mn 2+ The powder is prone to yellowing or partial yellowing, and after crushing, the brightness of the phosphor drops greatly, especially when it is crushed to a particle size of less than 4 μm required by PDP, the brightness of the phosphor will drop by about 40-60%

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Weigh 0.99 moles of ZnO, MnCO 3 0.01 mol, SiO 2 0.6 mole, NH 4 F0.005 mol, fully mixed with a mixer, put into an alumina crucible, put into a high-temperature furnace, heat up to 1300°C and burn for 1 hour, take it out after cooling. Crush the burnt product, remix it with a mixer, put it into an alumina crucible, put it into a high-temperature furnace, raise the temperature to 1300°C and burn it for 1 hour, and take it out by quenching. Use a ball mill to pulverize the calcined product to a size below 3 μm, put the pulverized powder into a crucible again, and calcinate at 1050° C. for 0.5 hour, then rapidly cool and take it out. Wash the burning product with deionized water until neutral, dehydrate, dry, and pass through a 400-mesh sieve to obtain a silicate green phosphor. The phosphor powder has a central particle diameter of 3.4 μm and a brightness of 112 under excitation at 147 nm.

Embodiment 2

[0019] Weigh 0.99 moles of ZnO, MnCO 3 0.01 mol, SiO 2 0.55 mol, NH 4 F0.005 moles, fully mix with mixer, all the other are with embodiment 1. The phosphor powder has a central particle diameter of 3.5 μm and a brightness of 108 under excitation at 147 nm.

Embodiment 3

[0021] Weigh 0.99 moles of ZnO, MnCO 3 0.01 mol, SiO 2 0.7 mol, NH 4 F0.005 moles, fully mix with mixer, all the other are with embodiment 1. The phosphor powder has a central particle diameter of 3.5 μm and a brightness of 99 under excitation at 147 nm.

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Abstract

A method for preparing zinc manganese silicates green emitting phosphor with small grain size, and the chemical expression of the silicate green emitting phosphor is Zn2-2xMn2xSiO4, 0.0025<=x<=0.08.The method comprises the following steps: (1) weighing needed stock and small quantity of fluxing agent according to the phosphor chemical proportion, mixing, (2) putting the mixture into pot, igniting in air or inert atmosphere at 1200-1400DEG C for at least 0.5-10 hours, taking up after cooling, (3) disintegrating the ignited product, mixing again with mixing machine and putting to the alumina crucible, putting the crucible into the high temperature furnace, heating at 1200-1400DEG C and igniting for at least 0.5-10 hours, quenching and taking up at about above 1000 DEG C or cooling under the protection of inert atmosphere and then taking up, (4) disintegrating the ignited product to be smaller than 3mum by means of ball grinding and air grinding, (5) putting the powder into the pot for a second time, igniting at 900-1100 DEG C for 10 minutes- 1hour, quenching and taking-up, (6) washing the ignited product with deionized water to be neutral, dewatering, drying, sifting and getting the silicate green emitting phosphor.

Description

technical field [0001] The invention relates to a preparation method of silicate green fluorescent powder for plasma display (PDP). It belongs to the technical field of fluorescent powder preparation. Background technique [0002] to Zn 2 SiO 4 :Mn 2+ The research on green phosphor has a history of many years. Since the 1940s, it has been widely used as a green phosphor (254nm excitation) component in fluorescent lamps and later CRT devices. It was replaced by calcium halophosphate phosphor with higher luminous efficiency and luminous flux maintenance characteristics, and is still used in CRT, long afterglow display and other fields. After the 1960s, flat panel display technologies such as PDP developed rapidly, and people Zn 2 SiO 4 :Mn 2+ The green phosphor has high luminance, good color coordinates and good stability under the excitation of vacuum ultraviolet light, which is very suitable for PDP display requirements. [0003] Zn 2 SiO 4 :Mn 2+ The synthesis me...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K11/59
Inventor 蒋建清董岩于金方峰
Owner SOUTHEAST UNIV