Process for preparing silicate green fluorescent powder

A technology of green fluorescent powder and silicate, which is applied in the direction of chemical instruments and methods, luminescent materials, etc., can solve the problems of increasing process cost, affecting the brightness of pink and fluorescent powder, and yellowing of pink, so as to achieve easy realization and eliminate pink hair. Yellow problem, the effect of simple preparation process

Inactive Publication Date: 2005-09-07
SOUTHEAST UNIV
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  • Application Information

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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, which seriously affects the brightness of pink and fluorescent powder. The brightness of yellowing powder can drop by more than 40%.
In order to solve the problem of pink yellowing, multiple high-temperature calcinations are often required, which increases the process cost, and the effect is still unsatisfactory

Method used

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  • Process for preparing silicate green fluorescent powder
  • Process for preparing silicate green fluorescent powder
  • Process for preparing silicate green fluorescent powder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Weigh 0.99 moles of ZnO, MnCO 3 0.01 mol, SiO 2 0.5 mole, NH 4 F 0.005 moles, fully mixed with a mixer, as a mixture; weigh SiO 2 0.05 mole, NH4 5 F 0.001 mole, as the preset material; put 2 / 3 of the mixed material into an alumina crucible, press out a cylindrical pit with a wooden stick, put the preset material into the pit, and continue to fill in the remaining mixed material. Put the crucible into a high-temperature furnace, heat up to 1200°C and burn for 1 hour, then take it out after rapid cooling. Pulverize the calcined product, wash with deionized water until neutral, dehydrate, dry, and sieve to obtain silicate green fluorescent powder. The phosphor has a brightness of 108 under 147nm excitation.

Embodiment 2

[0022] Weigh 0.99 moles of ZnO, MnCO 3 0.01 mol, SiO 2 0.5 mole, NH 4 F 0.005 moles, fully mixed with a mixer, as a mixture; weigh SiO 2 0.1 mole, NH4 5 F 0.001 mole, as preset material; All the other are with embodiment 1. The brightness of the phosphor is 105 under 147nm excitation.

Embodiment 3

[0024] Weigh 0.99 moles of ZnO, MnCO 3 0.01 mol, SiO 2 0.5 mole, NH 4 F 0.005 moles, fully mixed with a mixer, as a mixture; weigh SiO 2 0.2 mole, NH4 5 F 0.005 mole, as preset material; All the other are with embodiment 1. The brightness of the phosphor is 95 under 147nm excitation.

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Abstract

A method for preparing silicate 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 and mixing, (2) weighing silica dioxide and fluxing agent with the weight 5-40% of the mixture, and calling it preset material, (3) putting the mixture into the pot which taking up 1 / 2-2 / 3 of the pot, loading the preset material, then loading the mixture, (4) igniting the pot in air or inert atmosphere at 1200-1400 DEG C, quenching and taking it up at about above 1000 DEG C or cooling under the protection of inert atmosphere and then taking it up,(5)disintegrating the ignited product, washing, drying, sifting and getting the silicate green emitting phosphor. The process is simple and can get clear white powder only ignited for one time, eliminating the problem of yellow discoloration.

Description

technical field [0001] The invention relates to a preparation method of silicate green fluorescent powder. 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 synthesi...

Claims

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Application Information

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IPC IPC(8): C09K11/59
Inventor 蒋建清董岩于金方峰
Owner SOUTHEAST UNIV
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