Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

A novel polysilicate green fluorescent powder doped with rare earth ions for near-ultraviolet excitation white light LED and its preparation method

A technology of green fluorescent powder and rare earth ions, which is applied in the direction of luminescent materials, chemical instruments and methods, can solve the problems of low color rendering index of devices, lack of red light components, unfavorable indoor lighting, etc., and achieve high luminance of green light, suitable for Mass production, good effect of color purity

Inactive Publication Date: 2018-05-04
TAIYUAN UNIV OF TECH
View PDF3 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The lumen efficiency of the device obtained by this assembly method is the highest, but due to the lack of red light components, the device has a low color rendering index and a high color temperature, which is not conducive to indoor lighting

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
  • A novel polysilicate green fluorescent powder doped with rare earth ions for near-ultraviolet excitation white light LED and its preparation method
  • A novel polysilicate green fluorescent powder doped with rare earth ions for near-ultraviolet excitation white light LED and its preparation method
  • A novel polysilicate green fluorescent powder doped with rare earth ions for near-ultraviolet excitation white light LED and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] (1) According to the stoichiometric ratio, weigh 0.4312g Na 2 CO 3 , 0.4517g Y 2 o 3 , 0.4807g SiO 2 and 0.5995gSrCO 3 , and put them in a medium agate mortar accordingly;

[0029] (2) adding dehydrated ethanol whose quality is 2 times of the raw material quality to the above mixture, then grinding for 2 hours to make the reactants mix uniformly;

[0030] (3) Place the uniformly ground mixture in an oven and dry it at 80±5°C for 5 hours, then grind the obtained mixture again and put it into an alumina crucible;

[0031] (4) Put the above-mentioned alumina crucible loaded with raw materials into the constant temperature zone of the high-temperature sintering furnace. The high-temperature sintering furnace is first raised to 800±10°C (preferably 800°C) for sintering, and the temperature is kept constant for 5 hours. After the high-temperature furnace is cooled to room temperature, Take out the reaction raw materials and grind them again for 30 minutes. Finally, put ...

Embodiment 2

[0033] According to the stoichiometric ratio, weigh 0.4312g Na 2 CO 3 , 0.4517g Y 2 o 3 , 0.4807g SiO 2 , 0.5956gSrCO 3 and 0.0011g Eu 2 o 3 , and put into the medium agate mortar accordingly, all the other conditions are the same as embodiment 1, obtain the Na of the present invention after testing 4 Sr 2 Y 2 (Si 2 o 7 ) (SiO 4 ) 2 :0.3mol%Eu 2+ Phosphor.

Embodiment 3

[0035] According to the stoichiometric ratio, weigh 0.4312g Na 2 CO 3 , 0.4517g Y 2 o 3 , 0.4807g SiO 2 , 0.5950gSrCO 3 and 0.0018g Eu 2 o 3 , and put into the medium agate mortar accordingly, and all the other conditions are the same as embodiment 1, and the Na of the present invention is obtained after testing. 4 Sr 2 Y 2 (Si 2 o 7 ) (SiO 4 ) 2 :0.5mol%Eu 2+ Phosphor.

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 belongs to the technical field of luminescent materials, and relates to a novel polysilicate green fluorescent powder doped with rare earth ions for near-ultraviolet excitation white light LEDs and a preparation method thereof. The chemical expression of the novel polysilicate green fluorescent powder in the present invention is Na4Sr2Y2(Si2O7)(SiO4)2:Eu2+. The preparation method of the present invention is to take quantitative analytically pure SrCO3, SiO2, Na2CO3 and spectroscopically pure Y2O3 and Eu2O3 as raw materials according to the stoichiometric ratio of the chemical expression, and synthesize them under a CO reducing atmosphere by using a high-temperature solid-phase method. The preparation method of the invention is simple, and the synthesized novel polysilicate green fluorescent powder has the advantages of strong near-ultraviolet absorption, high green emission brightness and good thermal stability. Therefore, this polysilicate is a phosphor with excellent performance, and can be widely used in white LED lighting, display and other fields.

Description

technical field [0001] The invention belongs to the technical field of luminescent materials, and relates to a novel polysilicate green fluorescent powder doped with rare earth ions for near-ultraviolet excitation white light LEDs and a preparation method thereof. Background technique [0002] White light-emitting diodes (WLEDs) are considered to be the fourth-generation ideal solid-state lighting sources due to their advantages of energy saving, environmental protection and long service life, and will eventually replace the current lighting sources such as incandescent lamps and fluorescent lamps. The current commercial WLED devices mainly use semiconductor GaN-based LED chips and YAG:Ce 3+ Phosphor powder packaging and assembly, its working principle is that the LED chip emits blue light after being energized, thereby exciting the YAG:Ce 3+ The phosphor gets yellow light, and the blue light that is not fully absorbed in the chip is mixed to get white light emission. The ...

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
Patent Type & Authority Patents(China)
IPC IPC(8): C09K11/79
Inventor 田跃崔彩娥黄平王磊冯宁宁
Owner TAIYUAN UNIV OF TECH
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

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

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com