Supercharge Your Innovation With Domain-Expert AI Agents!

White fluorescent powder for LED (Light Emitting Diode) excited through ultraviolet and infrared modes and preparation method

A dual-mode, phosphor technology, used in chemical instruments and methods, the use of gas discharge lamps, luminescent materials, etc., can solve the problems of low color rendering index and weak red light part, and achieve high color rendering performance and strong luminescence. Intensity, high color rendering index effect

Inactive Publication Date: 2013-02-13
UNIV OF ELECTRONICS SCI & TECH OF CHINA +1
View PDF7 Cites 3 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the single-matrix phosphor M reported in the literature 2 V 2 o 7 , its preparation method is simple; but the color rendering index is low due to the relatively weak red light part, and it only has the traditional ultraviolet excitation down-conversion luminescence characteristics

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
  • White fluorescent powder for LED (Light Emitting Diode) excited through ultraviolet and infrared modes and preparation method
  • White fluorescent powder for LED (Light Emitting Diode) excited through ultraviolet and infrared modes and preparation method
  • White fluorescent powder for LED (Light Emitting Diode) excited through ultraviolet and infrared modes and preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0033] A preparation method of fluorescent powder for LEDs with dual channels and dual modes of ultraviolet and red light that excites white light, comprising the following steps:

[0034] Step 1: Weigh the corresponding mass of SrCO3 powder, NH4VO3 powder, Tb 2 o 3 Powder and Na 2 CO 3 Powder (Na 2 CO 3 The powder is a co-solvent, and its dosage is 3% of the total amount of the first three powders), wherein the molar ratio between Tb, Sr and V is x:(2-x):2, and x=0, 0.05, 0.10, 0.15, 0.20, 0.25, 0.30, 0.35.

[0035] Step 2: Mix the 8 kinds of proportioning raw materials obtained in step 1, respectively, to obtain 8 kinds of proportioning mixtures; when mixing the materials, you can put the raw materials weighed in step 1 into a clean ball mill tank and mix them by ball milling For specific ball milling, put the raw materials weighed in step 1 into the ball mill for 0.5 to 1 hour in both positive and negative directions, then take out the ball mill and dry it and pre-fir...

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 provides white fluorescent powder for LED (Light Emitting Diode) excited through ultraviolet and infrared modes and a preparation method of the white fluorescent powder, belonging to the technical field of functional materials. The fluorescent powder is a Sr2V2O7 powder material doped with Tb<3+> ion with a triclinic crystal orientation structure, and the molecular formula is Sr2-xV2O7: Tbx, wherein x is more than 0 and not greater than 0.35. The preparation method is a high temperature solid-phase reaction method. The fluorescent powder is excited by ultraviolet light of 320-370nm and infrared light of 600-725nm to obtain white light of 400-650nm, wherein the while light has relatively high strength and is well matched with an ultraviolet chip for the white LED, in particular with commercialized chip of 640nm. The white fluorescent powder provided by the invention has the advantages of high stability, simple preparation method, easy industrialization and high repeatability.

Description

technical field [0001] The invention belongs to the technical field of functional materials, and relates to a single-matrix fluorescent powder for light-emitting diodes and a preparation method thereof. Background technique [0002] Dual-mode excitation luminescent materials have both down-conversion and up-conversion luminescence characteristics. Materials for ultraviolet-excited white light LEDs are down-conversion luminescent materials, while fluorescent materials for red or infrared-excited white light LEDs are up-conversion materials. At present, there are two combinations of UV-excited white LEDs: UV LED chips + red, green and blue phosphors and UV LED chips + single-matrix white phosphors. In the former case, the white light obtained is unstable due to the difference in light decay and driving current of each phosphor. The latter can completely overcome the above shortcomings, and the cost is relatively low. Therefore, single-matrix white-light phosphors for UV-exci...

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): C09K11/69
CPCY02B20/181Y02B20/00
Inventor 杨维清林媛赵江涛白阳许晓东
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
Features
  • R&D
  • Intellectual Property
  • Life Sciences
  • Materials
  • Tech Scout
Why Patsnap Eureka
  • Unparalleled Data Quality
  • Higher Quality Content
  • 60% Fewer Hallucinations
Social media
Patsnap Eureka Blog
Learn More

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

© 2025 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com