Unlock instant, AI-driven research and patent intelligence for your innovation.

A kind of red fluorescent powder and preparation method thereof

A technology of red phosphor and atmosphere, applied in the field of red phosphor and its preparation, can solve the problems of low luminous efficiency of phosphor, difficulty in developing new nitride phosphor, restricting industrial production and application of phosphor, etc., and achieve high luminous efficiency , stable properties, widening color gamut effect

Active Publication Date: 2015-10-28
JIANGSU BREE OPTRONICS CO LTD
View PDF14 Cites 2 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] So far, this new silicon-based nitride red phosphor still has the following phenomena: ①The luminous efficiency of this type of phosphor is still low, only about half of the brightness of YAG yellow phosphor
②Due to the relative inertness of nitrides, the synthesis of silicon-based nitride phosphors usually requires harsh conditions such as active raw materials, high temperature and high pressure, which greatly restricts the industrial production and application of this series of phosphors, and also makes new nitride phosphors It is extremely difficult to develop

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 kind of red fluorescent powder and preparation method thereof
  • A kind of red fluorescent powder and preparation method thereof
  • A kind of red fluorescent powder and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Weigh Sr 3 N 2 (4N)0.012mol, Ca 3 N 2 (4N)0.006mol, Si 3 N 4 (4N)0.02mol, Li 3 N(4N)0.0004mol, AlN(4N)0.06mol, Eu 2 o 3 (4N) 0.0048mol; put the above raw materials into the molybdenum crucible after mixing and grinding in the glove box, and then quickly move it into the atmosphere furnace, keep it in 1800 °C 1MPaNH3 atmosphere for 5 hours, and the obtained product is crushed and pickled to remove impurities , sieved, and dried to obtain Ca 0.3 Sr 0.6 Li 0.02 Eu0.08 SiAlN 2.98 o 0.02 Phosphor. The XRD collection of illustrative plates of embodiment 1 sees figure 1 .

Embodiment 2

[0037] Weigh Sr 3 N 2 (4N)0.012mol, Ca 3 N 2 (4N)0.006mol, Si 3 N 4 (4N)0.02mol, Cs 3 N(4N)0.0004mol, AlN(4N)0.06mol, Eu 2 o 3 (4N) 0.0048mol; put the above raw materials into the molybdenum crucible after mixing and grinding in the glove box, and then quickly move it into the atmosphere furnace, keep it in 1800 °C 1MPaNH3 atmosphere for 5 hours, and the obtained product is crushed and pickled to remove impurities , sieved, and dried to obtain Ca 0.3 Sr 0.6 Cs 0.02 Eu 0.08 SiAlN 2.98 o 0.02 Phosphor. The emission spectra of embodiment 1 and comparative example 1 and embodiment 2 are compared see figure 2 .

Embodiment 3

[0041] Weigh Sr 3 N 2 (4N)0.004mol, Ca 3 N 2 (4N)0.0118mol, Si 3 N 4 (4N)0.02mol, Na 2 CO 3 (Excellent grade pure) 0.0006mol, AlN (4N) 0.06mol, EuN (4N) 0.0006mol; Then put the molybdenum crucible into the molybdenum crucible after the above-mentioned raw materials are mixed and ground in the glove box, then it is moved into the atmosphere furnace rapidly, at 2200 ℃0.1MPaN 2 / H 2 Atmosphere (N 2 / H 2 =95:5) for 2 hours, the resulting product is crushed, washed to remove impurities, classified by airflow, and dried to obtain Ca 0.59 Sr 0.2 Na 0.2 Eu 0.01 SiAlN 2.8 o 0.2 Phosphor. The emission spectra of embodiment 3 and comparative example 2 are compared see image 3 .

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

PropertyMeasurementUnit
color rendering indexaaaaaaaaaa
Login to View More

Abstract

The invention discloses red fluorescent powder and a preparation method thereof. A chemical structure formula of the red fluorescent powder is Ca1-x-y-zSrxEuyLzAlSiN3-zOz, wherein L is at least one of Li, Na, K, Rb and Cs, X is not less than 0.2 and not more than 0.8, Y is not less than 0.01 and not more than 0.1, and Z is not less than 0 and not more than 0.2. The red fluorescent powder can be effectively excited by ultraviolet light, purple light or blue light and has the characteristics of wide excitation wavelength range, high efficiency, stability and the like. The synthesized fluorescent powder is capable of emitting broadband visible light with a peak value of 500 nm to 700 nm under the excitation of light of 300 nm to 500 nm, so that the lighting effect and the color rendering index of a product is increased; alkali metal ions with high electronegativity are introduced and charges are balanced through trace oxygen, so that the lighting effect is improved and the color domain is expanded; and the red fluorescent powder can be effectively used in white LEDs with high color rendering indexes.

Description

technical field [0001] The invention relates to a red fluorescent powder and a preparation method thereof. Background technique [0002] The United States, Japan, Europe and China have successively issued policies restricting incandescent lamps, mercury lamps and trichromatic fluorescent lamps, and the American Energy Star standard stipulates that the color rendering index of indoor lighting CRI≥80, and some high-end applications require CRI≥ 90. As a new generation of solid-state lighting and display technology, LED can meet the requirements of high color rendering through various methods, and adding high-quality LED red phosphor is one of the important means. [0003] m 2 Si 5 N 8 :Eu 2+ (M=Ca, Sr, Ba) and CaAlSiN 3 :Eu 2+ This kind of nitride red phosphor has very stable physical and chemical properties, is stable and does not decompose in air and water, and has the advantages of low light attenuation and high luminous quantum. Compared with the former, CaAlSiN 3...

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): C09K11/80H01L33/50
CPCY02B20/181Y02B20/00
Inventor 何锦华滕晓明梁超符义兵刘凯
Owner JIANGSU BREE OPTRONICS CO LTD