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

Yellow phosphor for white light emitting diodes and preparation method thereof and white light emitting diode

A technology of light-emitting diodes and yellow phosphors, which is applied in the directions of light-emitting materials, chemical instruments and methods, electrical components, etc., can solve the problems of difficult color re-absorption and ratio regulation of phosphors, and low luminous efficiency.

Active Publication Date: 2015-11-04
CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
View PDF2 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, the use of ultraviolet chips to coat red, green and blue three primary color phosphors has problems such as color reabsorption and difficulty in ratio control.
Although many new systems have been discovered and reported for single-matrix white phosphors, such as CaIn 2 o 4 :Eu 3+ 、Sr 2 SiO 4 :Eu 2+ and Ca 9 Y (PO 4 ) 7 :Eu 2+ , Mn 2+ etc., but the luminous efficiency is still low

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
  • Yellow phosphor for white light emitting diodes and preparation method thereof and white light emitting diode
  • Yellow phosphor for white light emitting diodes and preparation method thereof and white light emitting diode
  • Yellow phosphor for white light emitting diodes and preparation method thereof and white light emitting diode

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0035] Correspondingly, the present invention provides a method for preparing yellow phosphor powder for white light emitting diodes, comprising the following steps:

[0036] mixing calcium-containing compound, hydrogen phosphate-containing compound, cerium-containing compound and activated carbon and then grinding to obtain a mixture;

[0037] Calcining the mixture in a reducing atmosphere to obtain a yellow phosphor powder for white light-emitting diodes with the chemical formula shown in formula (I);

[0038] Ca 4（1-x） O(PO 4 ) 2 :xCe 3+ Formula (I);

[0039] In formula (I), 0.0001≤x≤0.1.

[0040] The present invention uses compounds containing corresponding elements or groups as raw materials, activated carbon as an auxiliary agent, and adopts a solid-phase synthesis method to prepare the yellow fluorescent powder for white light-emitting diodes with the chemical formula shown in formula (I).

[0041] In the embodiment of the present invention, the calcium-containing...

Embodiment 1

[0057] According to the molar ratio of 1:1:0.01, CaCO 3 (analytical pure), CaHPO 4 (analytical pure) and CeO 2 (99.99%) mixed, and 20% (mass fraction) of activated carbon powder was added, fully ground to obtain a mixture.

[0058] Put the mixture into a corundum crucible, then into a large corundum crucible, fill with carbon rods around it, then put it into a high-temperature furnace, and bake it at 1350°C in the presence of carbon monoxide gas. After 10 hours, cool it naturally to Take out and grind at room temperature to obtain a product in the form of yellow powder, which is yellow phosphor powder for white light-emitting diodes.

[0059] X-ray diffraction analysis was carried out on the obtained product, the instrument used was Germany Bruker / D8-FOCUS X-Ray Diffractometer, the radiation source was Cu Kα1 (λ=1.5405nm), the scanning range: 2θ=10°~70°, and the scanning speed was 10 ° / min. See results figure 1 , figure 1 It is the XRD diffraction spectrum of the product...

Embodiment 2

[0062] According to the molar ratio of 1:1:0.01, CaCO 3 (analytical pure), CaHPO 4 (analytical pure) and CeO 2 (99.99%) mixed, and 20% (mass fraction) of activated carbon powder was added, fully ground to obtain a mixture.

[0063] Put the mixture into a corundum crucible, then into a large corundum crucible, fill the surrounding with carbon rods, then put it into a high-temperature furnace, and bake it at 1400°C in the presence of carbon monoxide gas. After 7 hours, naturally cool to room temperature , take out and grind to obtain a product in the form of yellow powder, which is yellow phosphor powder for white light-emitting diodes, and the chemical formula is shown in formula (I).

[0064] Gained product is carried out the test of excitation spectrum and emission spectrum, the result sees figure 2 and image 3 . Depend on figure 2 and image 3 It can be seen that the yellow phosphor powder for white light-emitting diodes can be effectively excited by near-ultraviol...

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 a yellow phosphor for white light emitting diodes and a preparation method thereof. The method comprises the following steps: mixing a calcium-containing compound, a hydrogen phosphate radical containing compound, a cerium-containing compound and active carbons, and grinding the obtained mixture, so that a mixture is obtained; and roasting the obtained mixture in a reducing atmosphere, so that a yellow phosphor for white light emitting diodes shown in a chemical formula (I) is obtained, wherein in the formula (I), x is greater than or equal to 0.0001 and less than or equal to 0.1. According to the invention, a yellow phosphor is prepared by taking tetracalcium phosphate as a matrix and taking cerium ions as an activating agent, the excitation band of the phosphor and the emission peak of a gallium nitride light source are overlapped well, so that the phosphor can be effectively excited to produce 500-750 nm broad-peak emission, and the phosphor can be used in a white light emitting diode taking blue-ray gallium nitride as a light source. The method is simple and environmentally friendly, and suitable for being promoted. The invention also provides a white light emitting diode. Ca(4(1-x))O(PO4)2:xCe<3+> formula (I).

Description

technical field [0001] The invention relates to the technical field of fluorescent powder for white light emitting diodes, in particular to a yellow fluorescent powder for white light emitting diodes, a preparation method thereof and a white light emitting diode. Background technique [0002] Light Emitting Diode (LED for short) is a new type of semiconductor lighting source, which has become a research hotspot in recent years due to its advantages of energy saving, environmental protection, long life and high luminous efficiency. LEDs of different semiconductor materials can emit light of different colors, such as indium gallium nitride diodes emit blue light. At present, there are two main types of white light-emitting diodes: phosphor-converted white light LEDs and multi-chip white light LEDs. White LED phosphors can be divided into three categories: yellow phosphors that can be excited by blue LED chips; red, green, and blue phosphors that can be excited by near-ultravi...

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): C09K11/71H01L33/50
Inventor 李成宇贾永雷庞然苏锵
Owner CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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