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Eu<2+> activated sodium-calcium silicate green phosphor and preparation and application

A green phosphor and silicate technology, which is applied in the field of silicate green phosphor and its preparation, preparation, and phosphor, can solve the problems of low synthesis temperature, chemical properties, reduced luminous intensity, low color rendering index, etc. Good crystallinity, reduced energy consumption, and high luminous efficiency

Inactive Publication Date: 2014-12-10
ANHUI XINDE CHEM FIBER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is aimed at YAG in the prior art: Ce 3+ The luminous intensity decreases with the increase of ambient temperature, low color rendering index, high color temperature and low luminous efficiency, and the existing green phosphors are generally not suitable for excitation in the 350-420 nm band. Through Doping Eu in silicate matrix materials 2+ , to obtain a green phosphor with low synthesis temperature, stable chemical properties and high luminous efficiency, which can be efficiently excited by ultraviolet-near ultraviolet (350-420 nm) LED dies, which can be used to prepare white light LEDs

Method used

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  • Eu&lt;2+&gt; activated sodium-calcium silicate green phosphor and preparation and application
  • Eu&lt;2+&gt; activated sodium-calcium silicate green phosphor and preparation and application
  • Eu&lt;2+&gt; activated sodium-calcium silicate green phosphor and preparation and application

Examples

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Effect test

Embodiment 1

[0028] Preparation of Ca 2.997 Eu 0.003 Na 2 Si 2 o 8

[0029] According to the chemical formula Ca 2.997 Eu 0.003 Na 2Si 2 o 8 The stoichiometric ratio of each element in the raw material was weighed separately, calcium carbonate CaCO 3 : 1.499 g, europium nitrate Eu(NO 3 ) 3 : 0.005 g, sodium oxide Na 2 O: 0.310 g, silicon dioxide SiO 2 : 0.610 g, after grinding and mixing in an agate mortar, select the air atmosphere for the first calcination, the temperature is 300 ℃, the calcination time is 10 hours, then cool to room temperature, take out the sample; the raw material calcined for the first time is fully Mix and grind evenly, sinter again in a reducing atmosphere at a temperature of 900°C, and calcine for 4 hours, then cool to room temperature, and take out the sample; finally, it is fully ground again and placed in a muffle furnace for sintering in a reducing atmosphere, and the calcination temperature is 1000°C , the calcination time is 11 hours, and the...

Embodiment 2

[0036] Preparation of Ca 2.985 Eu 0.015 Na 2 Si 2 o 8

[0037] According to the chemical formula Ca 2.985 Eu 0.015 Na 2 Si 2 o 8 The stoichiometric ratio of each element in the raw material was weighed respectively, calcium hydroxide Ca(OH) 2 : 1.105 g, europium oxide Eu 2 o 3 : 0.014 g, sodium carbonate Na 2 CO 3 : 0.530 g, silicon dioxide SiO 2 : 0.610 g, after grinding and mixing in an agate mortar, select the air atmosphere for the first calcining, the temperature is 500 ° C, the calcining time is 5 hours, then cool to room temperature, take out the sample; the raw materials calcined for the first time are fully Mix and grind evenly, sinter again in a reducing atmosphere at a temperature of 800°C, and calcine for 8 hours, then cool to room temperature, and take out the sample; finally, it is fully ground again and placed in a muffle furnace for sintering in a reducing atmosphere, and the calcination temperature is 1200°C , the calcination time is 6 hours, ...

Embodiment 3

[0039] Preparation of Ca 2.97 Eu 0.03 Na 2 Si 2 o 8

[0040] According to the chemical formula Ca 2.97 Eu 0.03 Na 2 Si 2 o 8 The stoichiometric ratio of each element in the raw material was weighed separately, calcium carbonate CaCO 3 : 1.485 g, europium nitrate Eu (NO 3 ) 3 : 0.051 g, sodium carbonate Na 2 CO 3 : 0.530 g, silicon dioxide SiO 2 : 0.610 g, after grinding and mixing in an agate mortar, select the air atmosphere for the first calcination, the temperature is 350 ° C, the calcination time is 8 hours, then cool to room temperature, take out the sample; the raw material for the first calcination is fully Mix and grind evenly, sinter again in a reducing atmosphere at a temperature of 850°C, and calcine for 6 hours, then cool to room temperature, and take out the sample; finally, it is fully ground again and placed in a muffle furnace for sintering in a reducing atmosphere, and the calcination temperature is 1100°C , the calcination time is 10 hours, a...

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Abstract

The invention relates to Eu<2+> activated sodium-calcium silicate green phosphor and preparation and application, and belongs to the technical field of rare earth phosphor luminescent materials. The phosphor has a chemical formula of Ca3-3xEu3xNa2Si2O8, wherein x represents molar doping amount of Eu<2+> doped in the phosphor instead of Ca<2+>, 0.0001<x<=0.6. The phosphor is prepared by calcination for 5-13 h in a reducing atmosphere and at a temperature of 1000-1300 DEG C and employing a solid-phase sintering method. Under the excitation of near ultraviolet light with a wavelength of 350-420 nm, the phosphor emits green fluorescence with a center wavelength nearby 525 nm. The prepared phosphor has wide excitation wavelength, high luminescent intensity, good crystallinity and narrow particle size distribution, is applicable to white light LED excitated by near ultraviolet light, can be popularized and applied to illumination and display fields, and has substantial economical benefit and social benefit.

Description

technical field [0001] The present invention relates to a kind of fluorescent powder, preparation method and application thereof, particularly to a kind of Eu 2+ The activated silicate green fluorescent powder and its preparation method belong to the technical field of fluorescent powder for light-emitting diodes (LEDs) in the field of illumination and display. Background technique [0002] Since the successful application of blue light-emitting diodes (LEDs), semiconductor solid-state lighting technology has developed rapidly. White light LED not only overcomes the shortcomings of traditional incandescent lamps and fluorescent lamps such as high power consumption, fragility, and waste mercury pollution, but also has the advantages of high photoelectric efficiency, long life, small size, low power, solid-state energy saving, and green environmental protection. Recognized as a new type of lighting source, it has great application prospects in the field of lighting and displa...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K11/59H01L33/50
CPCY02B20/181Y02B20/00
Inventor 黄彦林陶正旭关莹秦琳
Owner ANHUI XINDE CHEM FIBER