LED (Light Emitting Diode) fluorescent powder precursor as well as method for preparing same with liquid phase method

A technology of precursor and phosphor, which is applied in the field of phosphor preparation, can solve the problems that the precursor is difficult to achieve a pure phase, the brightness of the phosphor is not high, and the performance of the phosphor is affected, and the control is convenient, the generation rate is improved, and the pollution is small. Effect

Active Publication Date: 2018-10-16
江苏天洋稀土有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It is difficult to achieve a pure phase through such a simple solid-phase mixed powder and precursor, and there are traces of impurity phases, which seriously affect the performance of the phosphor, and the brightness of the phosphor produced is not high.

Method used

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  • LED (Light Emitting Diode) fluorescent powder precursor as well as method for preparing same with liquid phase method
  • LED (Light Emitting Diode) fluorescent powder precursor as well as method for preparing same with liquid phase method
  • LED (Light Emitting Diode) fluorescent powder precursor as well as method for preparing same with liquid phase method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0060] First, in proportion, weigh 60% of liquid lutetium chloride, 1% of liquid cerium nitrate, and 39% of slurry-like aluminum powder.

[0061] The process of preparing the precursor is as follows: first inject the clear liquid into the oxalic acid dissolution tank, add HCL to adjust the pH of the liquid to PH=1; then add 7kg of oxalic acid to dissolve, the temperature rises to 50°C during dissolution, and put the obtained oxalic acid liquid into the precipitation tank The bottom water is used as the bottom water; the spare oxalic acid liquid is also prepared in the oxalic acid dissolving tank. Pour 60% lutetium chloride liquid and 1% cerium nitrate liquid into the sedimentation bucket at the same time for direct precipitation. Put 39% dissolved aluminum powder into the sedimentation bucket at the same time, stir for 5 minutes and then precipitate. Turn on the oxalic acid flow meter in the oxalic acid dissolving tank to 90ml, then turn on the feed liquid flow meter to 0 scale...

Embodiment 2

[0064] First, in proportion, weigh 65% of liquid lutetium chloride, 1% of liquid cerium nitrate, and 34% of slurry-like aluminum powder.

[0065] The process of preparing the precursor is as follows: first inject the clear liquid into the oxalic acid dissolution tank, add HCL to adjust the pH of the liquid to PH=1; then add 7kg of oxalic acid to dissolve, the temperature rises to 55°C during dissolution, and put the obtained oxalic acid liquid into the precipitation tank The bottom water is used as the bottom water; the spare oxalic acid liquid is also prepared in the oxalic acid dissolving tank. Pour 65% lutetium chloride liquid and 1% cerium nitrate liquid into the sedimentation tank at the same time to precipitate directly. Put 34% dissolved aluminum powder into the sedimentation bucket at the same time, stir for 5 minutes and then precipitate. Turn on the oxalic acid flow meter in the oxalic acid dissolving tank to 90ml, then turn on the feed liquid flow meter to 0 scale;...

Embodiment 3

[0068] First, in proportion, weigh 69% of liquid lutetium chloride, 1% of liquid cerium nitrate, and 30% of pasty aluminum powder.

[0069] The process of preparing the precursor is as follows: first inject the clear liquid into the oxalic acid dissolution tank, add HCL to adjust the pH of the liquid to PH=1; then add 7kg of oxalic acid to dissolve, the temperature rises to 60°C during dissolution, and put the obtained oxalic acid liquid into the precipitation tank The bottom water is used as the bottom water; the spare oxalic acid liquid is also prepared in the oxalic acid dissolving tank. Simultaneously inject 69% lutetium chloride liquid and 1% cerium nitrate liquid into the sedimentation tank for direct precipitation. Put 30% dissolved aluminum powder into the sedimentation bucket at the same time, stir for 5 minutes and then precipitate. Turn on the oxalic acid flow meter in the oxalic acid dissolving tank to 90ml, then turn on the feed liquid flow meter to the 0 scale; ...

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Abstract

The invention relates to the field of fluorescer preparation and in particular relates to an LED (Light Emitting Diode) fluorescent powder precursor as well as a method for preparing same with a liquid phase method. The LED fluorescent powder precursor comprises 60-70% of liquid lutecium chloride, 1-2% of liquid cerous nitrate and 30-40% of aluminum powder. The method for preparing the LED fluorescent powder precursor with the liquid phase method comprises the following specific steps: S1, preparing an aluminum chloride liquid and a cerous nitrate liquid; S2, carrying out coprecipitation on the aluminum chloride liquid and the cerous nitrate liquid and dissolved slurry aluminum powder; S3, carrying out solid-liquid separation on coprecipitate, and cleaning a separated solid; S4, carrying out high-temperature sintering on the cleaned solid, thereby obtaining the precursor. By adopting the LED fluorescent powder precursor, the relative brightness of final product fluorescent powder can be increased by 3%. Due to adoption of cerium ions, the light emission performance of the lutetium ions can be well excited. The preparation method of the precursor provided by the invention is simplein process and convenient to control, and the powder particle size can be effectively controlled.

Description

technical field [0001] The invention relates to the field of fluorescent agent preparation, in particular to an LED fluorescent powder precursor and a method for preparing it by a liquid phase method. Background technique [0002] With the rapid development of white LEDs, the lumen requirements of LEDs are getting higher and higher, which requires higher and higher phosphor efficiency. The LED phosphors that are currently popular in the market are gradually unable to meet the increasing requirements for LED lumens. The preparation methods of phosphors and their precursors on the market are too rough, single and simple. [0003] At present, the Chinese patent with the publication number CN107760303A discloses a method for preparing YAG:Ce phosphor in low-temperature solid state, the method includes: mixing aluminum salt, cerium salt and yttrium oxide powder according to the stoichiometric ratio, and grinding until the mixture presents a paste , standing at room temperature ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/80H01L33/50
CPCC09K11/7774H01L33/502
Inventor 蒋留扣
Owner 江苏天洋稀土有限公司
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