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Preparation method for CaSi2O2N2:Eu<2+> fluorescence nano-fiber

A technology of fluorescent nanofibers and calcium nitrate, applied in fiber treatment, fiber chemical characteristics, spinning solution preparation, etc., to achieve good fiber shape, simple method, and good application prospects

Inactive Publication Date: 2012-02-22
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, how to control the morphology of oxynitride phosphors and prepare fluorescent nanofibers is still a major challenge.

Method used

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  • Preparation method for CaSi2O2N2:Eu&lt;2+&gt; fluorescence nano-fiber
  • Preparation method for CaSi2O2N2:Eu&lt;2+&gt; fluorescence nano-fiber
  • Preparation method for CaSi2O2N2:Eu&lt;2+&gt; fluorescence nano-fiber

Examples

Experimental program
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Effect test

Embodiment 1

[0024] Dissolve 1.4mmol calcium nitrate, 0.07mmol europium nitrate in 20ml alcohol-water mixed solvent (V 醇 / V 水 =8.5:1.5). Add 2.8mmol tetraethyl orthosilicate dropwise to the above solution under stirring, continue stirring for 0.5h, then add 1.6g polyvinylpyrrolidone (M w =1300000) to adjust the viscosity of the solution, continue stirring for 0.5h, and finally obtain a uniform and transparent spinning solution. Fill the prepared spinning solution into the syringe and put it into the peristaltic pump. Connect the needle to the anode of the high-voltage generator, use the aluminum foil as the receiving device, connect it to the cathode, the voltage is 8kV, and the distance between the spinning needle and the receiving aluminum foil is 15cm. The pushing speed of the peristaltic pump was 8 μl / min. After 0.5 h of electrospinning, a uniform layer of white fibers was collected on the receiving aluminum foil. The fibers obtained by electrospinning were put into a high-tempera...

Embodiment 2

[0026] Dissolve 2.0mmol calcium nitrate and 0.10mmol europium nitrate in alcohol-water mixed solvent (V 醇 / V 水 =9:1). Under vigorous stirring, 4.0mmol tetraethyl orthosilicate was added dropwise to the above solution, and after continuous stirring for 2h, 2.0g polyvinylpyrrolidone (M w =40000) to adjust the viscosity of the solution, and then continue to stir for 2h to finally obtain a uniform and transparent spinning solution. Fill the prepared spinning solution into the syringe and put it into the peristaltic pump. Connect the needle to the anode of the high-voltage generator, use the aluminum foil as the receiving device, connect it to the cathode, the voltage is 12kV, and the distance between the spinning needle and the receiving aluminum foil is 20cm. The pushing speed of the peristaltic pump was 20 μl / min. After 4 h of electrospinning, a uniform layer of white fibers was collected on the receiving aluminum foil. The fibers obtained by electrospinning were put into a...

Embodiment 3

[0028] Dissolve 3.0mmol calcium nitrate and 0.10mmol europium nitrate in alcohol-water mixed solvent (V 醇 / V 水 =8.5:1.5). Under vigorous stirring, 9.0mmol tetraethyl orthosilicate was added dropwise to the above solution, and after continuous stirring for 1h, 2.0g polyvinylpyrrolidone (M w =40000) to adjust the viscosity of the solution, and then continue stirring for 1 h to finally obtain a uniform and transparent spinning solution. Fill the prepared spinning solution into the syringe and put it into the peristaltic pump. Connect the needle to the anode of the high-voltage generator, use the aluminum foil as the receiving device, connect it to the cathode, the voltage is 10kV, and the distance between the spinning needle and the receiving aluminum foil is 16cm. The pushing speed of the peristaltic pump was 14 μl / min. After 2 h of electrospinning, a uniform layer of white fibers was collected on the receiving aluminum foil. The fibers obtained by electrospinning were put ...

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Abstract

The present invention relates to a preparation method for CaSi2O2N2:Eu<2+> fluorescence nano-fiber. The method comprises the following steps: (1) dissolving calcium nitrate and europium nitrate in a mixed solvent comprising alcohol and water; adding tetraethyl orthosilicate while stirring; adding polyvinylpyrrolidone after stirring; continuously stirring to obtain a spinning liquid; (2) pouring the spinning liquid into a syringe, carrying out electrostatic spinning to collect a layer of uniform white fiber on receiving aluminum foil; (3) placing the white fiber into a high-temperature tubularatmosphere furnace to carry out a heat treatment; finally carrying out cooling along with the furnace to obtain the CaSi2O2N2:Eu<2+> fluorescence nano-fiber. The method of the present invention has characteristics of simpleness, low nitridation temperature and short time. The prepared CaSi2O2N2:Eu<2+> phosphor has good fiber morphology so as to contribute to improvement of the luminescent property and the later package in the LED, and has a good application prospect.

Description

technical field [0001] The invention belongs to the field of preparation of fluorescent nanofibers, in particular to a CaSi 2 o 2 N 2 :Eu 2+ Preparation method of fluorescent nanofibers. Background technique [0002] In 1997, Nichia Corporation of Japan synthesized the first white LED by using blue LED chip and yellow YAG:Ce phosphor, which started the era of semiconductor lighting. [0003] Photoluminescent material (ie fluorescent material) technology is one of the key technologies in white LED, which directly determines the color temperature, color rendering index, luminous efficiency and service life of white LED lighting devices. The currently widely used YAG:Ce phosphor has low color rendering index, poor thermal stability, and high color temperature due to the limitation of the oxide matrix, so it is difficult to meet the growing demand in the lighting field. In order to solve this problem, oxynitride phosphors with excellent thermal stability and high color rend...

Claims

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Application Information

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IPC IPC(8): D01F9/10D01D1/02D01D5/00D01D10/02C09K11/59H01L33/50
Inventor 王宏志谷鋆鑫李耀刚张青红
Owner DONGHUA UNIV
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