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Preparation method of red fluorescent powder for LED (light-emitting diode)

A technology of red phosphor and white, applied in the field of preparation of red phosphor for LED, can solve the problems of high cost, complicated tungstate equipment and high color temperature, achieve the opportunity to reduce impurities, and is suitable for mass production and preparation process mild effect

Inactive Publication Date: 2012-12-19
LIAOCHENG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the most widely used phosphor powder for white light LED in the world is YAG:Ce phosphor, but this light source also has the following disadvantages: low color rendering index, high color temperature, serious attenuation, etc.
[0005] However, the equipment required for the production of the above-mentioned tungstate is complicated, the repeatability is poor, the cost is high, and it is not easy for industrialized production

Method used

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  • Preparation method of red fluorescent powder for LED (light-emitting diode)
  • Preparation method of red fluorescent powder for LED (light-emitting diode)

Examples

Experimental program
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Effect test

Embodiment 1

[0022] A preparation method of red fluorescent powder for LED, comprising the steps of:

[0023] First prepare solution A: dissolve 0.1760g of europium oxide in 5ml of concentrated nitric acid, heat and stir until completely dissolved, continue heating until the solution is evaporated to dryness, then add 40ml of deionized water to obtain solution A; dissolve 0.6597g of sodium tungstate dihydrate in 40ml deionized water to obtain solution B; then add solution B dropwise to solution A to obtain a white turbid solution; the concentration of europium ions in the turbid solution is 0.01mol / L, and the concentration of tungsten ions is 0.02mol / L; add nitric acid and sodium hydroxide solution to adjust the pH of the solution to 2; then, add the obtained white turbid liquid into an autoclave, heat to 180°C, keep it warm for 24 hours, and naturally cool to room temperature; finally, filter the obtained product and dry it get red EuW 2 o 6 (OH) 3 Phosphor. The phosphor particles are...

Embodiment 2

[0025] A preparation method of red fluorescent powder for LED, comprising the steps of:

[0026] First prepare solution A: dissolve 0.0352g of europium oxide in 5ml of concentrated nitric acid, heat and stir until completely dissolved, continue heating until the solution is evaporated to dryness, then add 40ml of deionized water to obtain solution A; dissolve 0.1319g of sodium tungstate dihydrate In 40ml deionized water, solution B was obtained; then solution B was added dropwise to solution A to obtain a white turbid solution; the concentration of europium ions in the white turbid solution was 0.002mol / L, and the concentration of tungsten ions was 0.004mol / L; Add nitric acid and sodium hydroxide solution to adjust the pH of the solution to 3; then, add the obtained white turbid liquid into an autoclave, heat to 240°C, and keep it warm for 20 hours; naturally cool to room temperature; finally, filter and dry the obtained product You can get red EuW 2 o 6 (OH) 3 Phosphor.

Embodiment 3

[0028] A preparation method of red fluorescent powder for LED, comprising the steps of:

[0029] First prepare solution A: dissolve 0.88g of europium oxide in 5ml of concentrated nitric acid, heat and stir until completely dissolved, continue heating until the solution is evaporated to dryness, then add 40ml of deionized water to obtain solution A; dissolve 3.2985g of sodium tungstate dihydrate In 40ml of deionized water, solution B was obtained; then solution B was added dropwise to solution A to obtain a white turbid solution; the concentration of europium ions in the white turbid solution was 0.05mol / L, and the concentration of tungsten ions was 0.1mol / L; The pH of the solution was adjusted to 4 by adding nitric acid and sodium hydroxide solution; then, the obtained white turbid liquid was added to an autoclave, heated to 170° C., and kept for 72 hours; naturally cooled to room temperature; finally, the obtained product was filtered, Dry to get red EuW 2 o 6 (OH) 3 Phosp...

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Abstract

The invention relates to a preparation method of a red fluorescent powder for LED, which comprises the following steps: (1) dissolving a given amount of europium oxide in concentrated nitric acid; heating and stirring until the europium oxide is completely dissolved; continue heating for evaporation to dryness, and then adding deionized water to obtain a solution A; dissolving a given amount of sodium tungstate or ammonia tungstate in the deionized water to obtain a solution B; (2) dropwise adding the solution B to the solution A and continuously stirring to obtain a white turbid solution, and then adding a salpeter solution or a sodium hydroxide solution to the white turbid solution to regulate the pH value to 2-4; (3) filling the white turbid solution to a high pressure kettle, heating to 170-240 DEG C, preserving heat for 20-72 hours, and naturally cooling to the room temperature; and (4) filtering and drying obtained products to obtain the red fluorescent powder. The invention hassimple process, is easy to implement and can reduce the probability of introducing impurities; the preparation process of the preparation method requires simple equipment, has high reaction speed andis more suitable for large-scale production.

Description

technical field [0001] The invention relates to the technical field of inorganic synthesis of optical functional materials, in particular to a preparation method of red fluorescent powder for LEDs. Background technique [0002] As a new generation of light source, white LED light source has the advantages of energy saving and high efficiency, and has attracted widespread attention. In white LED lighting technology, the type and preparation of phosphor determine key technical parameters such as luminous spectrum, luminous efficiency, color rendering index, color temperature and service life of white LED. Therefore, phosphor plays an important role in white LED technology. [0003] At present, the most widely commercially used phosphor powder for white LEDs in the world is YAG:Ce phosphor powder, but this light source also has the following disadvantages: low color rendering index, high color temperature, and severe attenuation. The main reason is the severe lack of red emis...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K11/78
Inventor 蒲锡鹏张大凤仪修杰贾丽萍苏昌华
Owner LIAOCHENG UNIV
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