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

Red fluorescent powder used for LED (light-emitting diode) and preparation method thereof

A red phosphor, phosphor technology, applied in chemical instruments and methods, luminescent materials, sustainable buildings, etc., can solve the problems of poor color rendering, low efficiency, unstable performance, etc., and achieve stable physical and chemical properties , the effect of high energy conversion efficiency and simple synthesis method

Active Publication Date: 2011-05-11
CHINA JILIANG UNIV
View PDF2 Cites 6 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the commercial products are mainly single-chip high-brightness white LEDs composed of blue LED chips and yellow light of YAG phosphor powder. As a result, the color rendering is not good, and red phosphor can be added to obtain a high color rendering index
However, in the prior art, some p

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
  • Red fluorescent powder used for LED (light-emitting diode) and preparation method thereof
  • Red fluorescent powder used for LED (light-emitting diode) and preparation method thereof
  • Red fluorescent powder used for LED (light-emitting diode) and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Embodiment 1: Weighing SrCO 3 9.9905g, GeO 2 2.5278g, Li 2 CO 3 0.0893g, Eu 2 o 3 0.4252g, the above raw materials are all analytically pure. After the weighed raw materials are mixed and ground evenly, they are put into an alumina crucible and roasted in the air, and kept at 1100°C for 3 hours. After cooling, take it out and crush it, grind it, wash it with water to remove impurities, and dry it to get the chemical composition of Sr 2.8 Li 0.1 GeO 5 : 0.1Eu 3+ The sample, its emission spectrum see Figure 1~Figure 4 . The main emission peak is 616 nm. Its excitation spectrum see Figure 5 . It can be seen from the figure that the phosphor can be effectively excited by ultraviolet, purple or blue light in the range of 300 nm to 480 nm, and has a wide range of uses.

Embodiment 2

[0022] Embodiment 2: Weigh Sr(NO 3 ) 2 11.6303g, GeO 2 3.3811g, Li 2 C 2 o 4 0.247g, Eu 2 o 3 0.8531g, and NH 4 Cl 0.1g, the above raw materials are all analytically pure. After the weighed raw materials are mixed and ground evenly, they are put into an alumina crucible and roasted in the air, and kept at 1100°C for 3 hours. After cooling, take it out and crush it, grind it, wash it with water to remove impurities, and dry it to get the chemical composition of Sr 1.7 Li 0.15 GeO 4 : 0.15Eu 3+ sample.

Embodiment 3

[0023] Embodiment 3: Weighing SrC 2 o 4 7.6229g, Ge(CO 3 ) 2 9.2859g, Li 2 CO 3 0.0891g, Eu(NO 3 ) 3 0.8148g, the above raw materials are all analytically pure. After mixing and grinding the weighed raw materials evenly, put them into an alumina crucible and roast them twice in the air. Secondary roasting, heat preservation at 1050°C for 3 hours. After cooling, take it out and crush it, grind it, wash it with water to remove impurities, and dry it to get the chemical composition of Sr 0.9 Li 0.05 GeO 3 : 0.05Eu 3+ sample.

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 discloses red fluorescent powder used for an LED (light-emitting diode). The red fluorescent powder is europium activated germanate fluorescent powder, and the chemical formula thereof is (Ma-2xAxEux)GebOc, wherein, M is at least one of Sr, Ba and Zn; A is at least one of Li, Na, K and Rb; a is less than or equal to 3 and more than 0; b is less than or equal to 4 and more than or equal to 1; c is more than or equal to 3 and less than or equal to 9; and x is less than 0.5 and more than 0. The preparation method comprises the steps of sintering at high temperature, smashing, cleaning for removing impurities and drying after uniformly mixing and grinding simple substances, compounds or corresponding salts of M, Ge and Eu and compounds or corresponding salts of A. The fluorescent powder has the characteristics of wide excitation wavelength range, high efficiency and high stability, the preparation method is simple, no pollution is produced, and the cost is low. The fluorescent powder can be widely applied to purple, ultraviolet or blue LED chips for fabricating a white LED.

Description

technical field [0001] The invention relates to a germanate red fluorescent powder and a preparation method thereof, in particular to a red fluorescent powder suitable for LEDs and a preparation method thereof, and belongs to the technical field of rare earth luminescent materials. Background technique [0002] In the 1990s, with the technological breakthrough of high-brightness GaN blue LEDs, in 1996, blue LEDs and YAG phosphors ((Y, Gd) appeared. 3 Al 5 o 12 : Ce 3+ ) combined white light LED, which is considered to be another leap in the history of human lighting after incandescent lamps and fluorescent lamps, and is one of the most promising high-tech fields in the 21st century. There are three ways to produce white light with phosphor: blue LED chip with yellow phosphor; blue LED chip with red and green phosphor; UV-LED chip with red, green and blue phosphors. At present, the commercial products are mainly single-chip high-brightness white LEDs composed of blue ...

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): C09K11/78
CPCY02B20/00
Inventor 黄立辉徐时清华有杰邓德刚王焕平赵士龙夹国华
Owner CHINA JILIANG UNIV
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