Sr2SiO4: Eu2+, N fluorescent powder and preparation method thereof

A fluorescent powder and stoichiometric ratio technology, applied in chemical instruments and methods, luminescent materials, etc., can solve the problems of concentration quenching, red shift of luminescent wavelength, red shift, etc., and achieve the effect of convenient regulation and wide excitation range

Inactive Publication Date: 2011-04-13
DONGHUA UNIV
View PDF1 Cites 2 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Increasing the content of Eu2+ can red-shift the emission wavelength, but excessive increase can easily cause concentration quenching
The second is to change the heat treatment temperature in the preparation process (J.H.Lee and Y.J.Kim, Mater.Sci.Eng.B, 2008, 146, 99), however, increasing the heat treatment temperature can only move the luminescence wavelength to a short

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Sr2SiO4: Eu2+, N fluorescent powder and preparation method thereof
  • Sr2SiO4: Eu2+, N fluorescent powder and preparation method thereof
  • Sr2SiO4: Eu2+, N fluorescent powder and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0028] Example 1

[0029] Take 11.84g of strontium carbonate, 2.4g of silicon oxide, 0.70g of europium oxide, and use ethanol as the ball milling medium for ball milling mixture. After uniform mixing, the raw materials were vacuum dried at 70°C for 6 hours, and then passed through a 200-mesh sieve. Put the obtained ingredients into an alumina porcelain boat, put it into a tubular atmosphere furnace, and pass ammonia gas with a flow rate of 300ml / min. The temperature is raised to 1200°C, and the heating rate is 4°C / min. At this temperature, Keep it warm for 2 hours. Under flowing ammonia, take it out after natural cooling to room temperature, use manual crushing, and finally obtain N-doped Sr 2 SiO 4 :Eu 2+ Phosphor. Among them, the stoichiometric ratio of Sr, Si, Eu, and N is 2:1:0.05:0.12.

[0030] figure 1 N-doped Sr obtained by nitriding at 1200℃ for 2 hours in ammonia gas flow 2 SiO 4 :Eu 2+ The X-ray diffraction pattern of the phosphor shows that the phase of the product a...

Example Embodiment

[0031] Example 2

[0032] Take 11.84 g of strontium carbonate, 2.4 g of silicon oxide, 0.42 g of europium oxide, and use ethanol as the ball milling medium for ball milling mixture. After uniform mixing, the raw materials were vacuum dried at 50°C for 12 hours, and then passed through a 150-mesh sieve. Put the obtained ingredients into an alumina porcelain boat, load it into a tubular atmosphere furnace, and pass ammonia gas at a flow rate of 100ml / min. The temperature is raised to 1400°C, and the heating rate is 2°C / min. At this temperature, Keep it warm for 2 hours. Under flowing ammonia, take it out after natural cooling to room temperature, use ball mill to pulverize, and finally obtain N-doped Sr 2 SiO 4 :Eu 2+ Phosphor. Among them, the stoichiometric ratio of Sr, Si, Eu, and N is 2:1:0.03:0.36.

[0033] Figure 4 N-doped Sr obtained by nitriding at 1400℃ for 2 hours in ammonia gas flow 2 SiO 4 :Eu 2+ The X-ray diffraction pattern of the phosphor, the phase of the product a...

Example Embodiment

[0034] Example 3

[0035] Take 11.84 g of strontium carbonate, 2.4 g of silicon oxide, 0.42 g of europium oxide, and use ethanol as the ball milling medium for ball milling mixture. After uniform mixing, the raw materials were vacuum dried at 70°C for 6 hours, and then passed through a 200-mesh sieve. Put the obtained ingredients into an alumina porcelain boat, put it into a tubular atmosphere furnace, and pass ammonia gas with a flow rate of 300ml / min. The temperature is increased to 1500℃, and the heating rate is 2℃ / min. At this temperature, Keep it warm for 1 hour. Under flowing ammonia, take it out after natural cooling to room temperature, use ball mill to pulverize, and finally obtain N-doped Sr 2 SiO 4 :Eu 2+ Phosphor. Among them, the stoichiometric ratio of Sr, Si, Eu, and N is 2:1:0.03:0.42.

[0036] Figure 7 N-doped Sr obtained by nitriding at 1500℃ for 1 hour in ammonia gas flow 2 SiO 4 :Eu 2+ The X-ray diffraction pattern of the phosphor, the phase of the product af...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

The invention relates to Sr2SiO4: Eu<2+>, N fluorescent powder and a preparation method thereof. The stoichiometric ratio of Sr to Si to Eu to N is 2: 1: x: y, wherein x is more than or equal to 0.03 and less than or equal to 0.05, and y is more than 0 and less than or equal to 0.5. The preparation method comprises the following steps of: mixing strontium carbonate, silicon oxide and europium oxide serving as raw materials uniformly, and screening and drying the mixture; nitriding the dried mixture in flowing ammonia gas flow; and crushing the product after nitriding to obtain bright yellow fluorescent powder. The N-doped Sr2SiO4: Eu<2+> fluorescent powder has wide excitation range and good effect of matching a blue light emitting diode (LED) chip; and the preparation method is simple, can conveniently realize control of emission wavelength during preparation, and is suitable for industrialized production.

Description

technical field [0001] The present invention belongs to Sr 2 SiO 4 :Eu 2+ Fluorescent powder and its preparation field, especially relate to a kind of Sr 2 SiO 4 :Eu 2+ , N fluorescent powder and preparation method thereof. Background technique [0002] With the development of white LED technology and the popularity of solid-state lighting, traditional white LED phosphors have gradually been unable to meet the growing needs of people. Currently widely used Eu 2+ and Ce 3+ Doped oxide phosphors (such as YAG:Ce phosphors), due to the limitation of oxide crystal field strength, it is difficult to extend the luminescence to the long-wavelength region, which leads to high color temperature and low color rendering index of white LEDs. In order to solve these problems, people have developed chalcogenide phosphors (such as SrS:Eu 2+ and CaS:Eu 2+ ) and nitride phosphors (such as Ca 2 Si 5 N 8 :Eu), however, sulfur-based phosphors have poor stability and are prone to del...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
IPC IPC(8): C09K11/59
Inventor 王宏志谷鋆鑫李耀刚张青红
Owner DONGHUA UNIV
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap