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

Silicon nitride orange red luminescent material for low color temperature white LED and preparation method thereof

A technology of silicon nitride orange and luminescent material, applied in luminescent materials, chemical instruments and methods, use of gas discharge lamps, etc., can solve the problems of serious defects, weak luminous intensity, poor crystallinity, etc., and achieves low cost and preparation technology Simple, overcoming the effect of poor thermal stability

Active Publication Date: 2014-06-18
江苏先进无机材料研究院
View PDF5 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But we know that due to the high specific surface area of ​​nanomaterials, it shows severe defects and poor crystallinity, which are unfavorable factors from the perspective of light emission.
Therefore, the luminous intensity observed in nano-silicon nitride is very weak

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
  • Silicon nitride orange red luminescent material for low color temperature white LED and preparation method thereof
  • Silicon nitride orange red luminescent material for low color temperature white LED and preparation method thereof
  • Silicon nitride orange red luminescent material for low color temperature white LED and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] According to chemical formula Si 3 N 4 :0.02Eu 2+ , Accurately weigh 1.2755g of silicon nitride powder and 0.0176g of europium trioxide into a beaker, add 100ml of alcohol, and ultrasonically disperse in an ultrasonic cleaner for 15 minutes. In this embodiment, high-purity α-phase silicon nitride (95% α-phase content, containing a small amount of β-phase silicon nitride, purchased from Aladdin Reagent Co., Ltd.) is used as a raw material, and the XRD diffraction pattern of the silicon nitride raw material is as follows figure 1 As shown, the main phase is α-phase silicon nitride, and there are a small amount of derivative peaks of β-phase silicon nitride. Europium trioxide was purchased from Sinopharm Chemical Reagent Co., Ltd. with a purity of 99.9%. The mixed raw material precursor after ultrasonic dispersion was dried in an oven at 80 degrees for 4 hours to obtain a dry powder. Put the obtained dry powder into a corundum crucible, place it in a high-temperature a...

Embodiment 2

[0031] According to chemical formula Si 3 N 4 :0.02Eu 2+ , 0.03Al, accurately weigh 1.2755g of silicon nitride (α phase content 95%, and 5% of β phase silicon nitride), 0.0176g of europium trioxide, 0.0124g of aluminum nitride and put them into a beaker, then add 100ml Alcohol, ultrasonically dispersed in an ultrasonic cleaner for 30 minutes. The raw materials of silicon nitride and europium trioxide were the same as those in Example 1, and the aluminum nitride was purchased from Aladdin Reagent Co., Ltd. with a purity of 99%. The raw material precursor after ultrasonic dispersion was dried in an oven at 80 degrees for 4 hours to obtain a dry powder. Put the obtained dry powder into a corundum crucible, place it in a high-temperature atmosphere horizontal tube furnace, and then vacuumize it. Raise the temperature to 1650 degrees at a rate of 5 degrees per minute, and keep warm for 4 hours. During the whole calcining process, a mixed gas of nitrogen and hydrogen is flowed ...

Embodiment 3

[0034] According to chemical formula Si 3 N 4 :0.0005Eu 2+ , accurately weigh 1.2755g of silicon nitride powder (95% of α phase content and 5% of β phase silicon nitride) and 0.00045g of europium trioxide into a beaker, add 80ml of alcohol, and ultrasonically Disperse for 10 minutes. The raw material adopted in this embodiment 3 is consistent with that in embodiment 1. The mixed raw material precursor after ultrasonic dispersion was dried in a 50 degree oven for 6 hours to obtain a dry powder. Put the obtained dry powder into a corundum crucible, place it in a high-temperature atmosphere horizontal tube furnace, and then vacuumize it. Raise the temperature to 1650 degrees at a rate of 5 degrees per minute, and keep warm for 4 hours. The nitrogen-hydrogen mixed gas is flowed into the whole calcining process, and the hydrogen ratio is 10%. Obtain the Si of present embodiment 3 after natural cooling 3 N 4 :0.0005Eu 2+ Luminescent material.

[0035] After detection, util...

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
emission peakaaaaaaaaaa
emission peakaaaaaaaaaa
Login to View More

Abstract

The invention belongs to the technical field of photoelectric materials, and relates to a Eu<2+> doped silicon nitride orange red luminescent material for a blue light-excitated white light-emitting diode (LED) and a preparation thereof. Chemical components of the Eu<2+> doped silicon nitride orange red luminescent material meet a chemical general formula, namely Si3N4:xEu<2+>,yAl, wherein x is more than or equal to 0.0005 and is less than or equal to 0.1; and y is more than or equal to 0 and is less than or equal to 0.2. The Eu<2+> doped silicon nitride orange red luminescent material is simple in preparation technology and low in cost; and the material emits orange red light with the wavelength of between 500 and 700nm under the excitation of blue light with the wavelength of between 400 and 450nm, and the emission peak value is 565nm. Because the emission bandwidth of the material covers partial red light area, the material contains more red light components compared with YAG:Ce<3+> yellow phosphor powder; in the meanwhile, a silicon nitride matrix has excellent thermal stability and chemical stability, so that the Eu<2+> doped silicon nitride orange red luminescent material has potential application prospect on low-color-temperature high-power white LEDs.

Description

technical field [0001] The invention belongs to the technical field of optoelectronic materials, in particular to Eu 2+ Doped silicon nitride orange-red luminescent material and preparation method thereof. Background technique [0002] Against the backdrop of global low-carbon, energy-saving, and environmental protection, semiconductor white LED solid-state lighting technology has developed rapidly in recent years. The most common and commercial implementation of white LEDs is to use InGaN blue chips to excite YAG:Ce 3+ Yellow phosphor. However, due to the lack of red light components, the white LEDs obtained in this way have high color temperature and poor color reproduction, which cannot meet the lighting needs of some special occasions (such as home lighting and hospital lighting). In order to obtain white LED devices with low color temperature and high color rendering, it is usually necessary to add red phosphor or YAG:Ce 3+ Phosphor powder is modified to increase it...

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): C09K11/59H01L33/50
CPCY02B20/181Y02B20/00
Inventor 祝迎春毛智勇
Owner 江苏先进无机材料研究院