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Simple process for preparing magnesium fluorogermanate: manganese red fluorescent powder

A technology of fluorogermanic acid and red light, applied in sustainable manufacturing/processing, germanium compounds, chemical industry, etc., can solve the problems of long production cycle, time-consuming and energy-consuming, etc., to save energy, shorten reaction time, and improve luminescence efficiency effect

Inactive Publication Date: 2011-01-19
QINGDAO ZHENGJIE INDAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But traditional preparation magnesium fluorogermanate: its temperature control procedure of the method for manganese is 1100 ℃ of insulation 2h, be raised to 1100 ℃ of insulation 40h after being lowered to room temperature, the main problem that exists is that the production cycle is too long, and time-consuming and energy-consuming Disadvantages limit its further application

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0008] First, according to the molar ratio MgO:GeO of the traditional process 2 : MgF 2 : MnCO 3 =3.5:1.0:0.5:0.01 Accurately weigh the raw materials, put them into an agate mortar and grind them carefully to make them fully mixed evenly, put the precursors into a corundum small crucible according to the method a, cover it, and then place it in a large In the ceramic crucible, cover it, and use the traditional process temperature control program to place it in the air atmosphere for two-stage roasting. First, the heating rate is raised to 1100°C at a rate of 6°C / min. Raise the temperature to 1100°C for 40 hours at the same heating rate, and cool down with the furnace. Compared with the samples prepared by the b placement method commonly used in the traditional process, the samples prepared by this placement method have the same luminous position, but the intensity is significantly increased, which is 1.25 times that of the traditional process.

Embodiment 2

[0010] According to the conditions of Example 1, the temperature control program was changed. First, the temperature was raised to 1100 °C at a rate of 6 °C / min, and the temperature was kept for 2 hours. In the furnace, the temperature was raised to 1200°C at the same rate, kept for 5 hours, and cooled with the furnace. The luminous position of the sample prepared according to this temperature control program does not change, and the luminous intensity is 1.61 times that of the sample prepared under the traditional process conditions.

Embodiment 3

[0012] According to the improved temperature program of Example 2, 1100°C, 2h; 1200°C, 5h, using placement a, changing the molar ratio of MgO in the raw material to 3.51, the prepared samples have the same luminous position, and the intensity is the same as when the MgO molar ratio is 3.5 The luminous intensity of the prepared sample was 1.1 times.

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Abstract

The invention discloses a simple process for preparing magnesium fluorogermanate: manganese red fluorescent powder, which is characterized by comprising the following steps of: accurately weighing raw materials in a certain molar ratio, and grinding the raw materials in an agate mortar; and then filling materials in two different modes respectively, putting the materials in a muffle furnace, heating the materials to between 1,100 and 1,200 DEG C at the heating speed of 6 DEG C per minute, preserving the heat for 1 to 3 hours, taking out the sample after the materials are cooled to room temperature, putting the sample into the agate mortar for secondary grinding, putting the powder in the muffle furnace, heating the powder to between 1,100 and 1,200 DEG C at the same heating speed, preserving the heat for 5 to 40 hours, and cooling the powder along with the furnace to obtain the magnesium fluorogermanate: manganese red fluorescent powder, wherein the excitation band of the red fluorescent powder is 280 to 440 nanometers and the red fluorescent powder emits red light with main emitting peak at 657 nanometers. The process has the advantages of short reaction time and energy conservation; and the obtained fluorescent powder has high luminous intensity.

Description

technical field [0001] The invention relates to a simple process for preparing magnesium fluorogermanate: manganese red fluorescent powder. Background technique [0002] Phosphors whose emission spectrum peaks lie in the long-wave red light band of 630-680nm have extremely important application value, but there are few commercially available phosphors whose emission spectrum peaks lie in this band. Magnesium fluorogermanate: manganese has a unique emission spectrum at 657nm, high stability under short-wave ultraviolet excitation, and good high-temperature characteristics, so it is a very suitable phosphor for high-pressure mercury lamps. But traditional preparation magnesium fluorogermanate: its temperature control procedure of the method for manganese is 1100 ℃ of insulation 2h, be raised to 1100 ℃ of insulation 40h after being lowered to room temperature, the main problem that exists is that the production cycle is too long, and time-consuming and energy-consuming The dis...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G17/00C09K11/66
CPCY02P20/10
Inventor 曹立新杨柳王萍萍柳伟苏革袁正杰袁宁王海枫
Owner QINGDAO ZHENGJIE INDAL
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